text:
*DECK DRC3JJ
      SUBROUTINE DRC3JJ (L2, L3, M2, M3, L1MIN, L1MAX, THRCOF, NDIM,
     +   IER)
C***BEGIN PROLOGUE  DRC3JJ
C***PURPOSE  Evaluate the 3j symbol f(L1) = (  L1   L2 L3)
C                                           (-M2-M3 M2 M3)
C            for all allowed values of L1, the other parameters
C            being held fixed.
C***LIBRARY   SLATEC
C***CATEGORY  C19
C***TYPE      DOUBLE PRECISION (RC3JJ-S, DRC3JJ-D)
C***KEYWORDS  3J COEFFICIENTS, 3J SYMBOLS, CLEBSCH-GORDAN COEFFICIENTS,
C             RACAH COEFFICIENTS, VECTOR ADDITION COEFFICIENTS,
C             WIGNER COEFFICIENTS
C***AUTHOR  Gordon, R. G., Harvard University
C           Schulten, K., Max Planck Institute
C***DESCRIPTION
C
C *Usage:
C
C        DOUBLE PRECISION L2, L3, M2, M3, L1MIN, L1MAX, THRCOF(NDIM)
C        INTEGER NDIM, IER
C
C        CALL DRC3JJ (L2, L3, M2, M3, L1MIN, L1MAX, THRCOF, NDIM, IER)
C
C *Arguments:
C
C     L2 :IN      Parameter in 3j symbol.
C
C     L3 :IN      Parameter in 3j symbol.
C
C     M2 :IN      Parameter in 3j symbol.
C
C     M3 :IN      Parameter in 3j symbol.
C
C     L1MIN :OUT  Smallest allowable L1 in 3j symbol.
C
C     L1MAX :OUT  Largest allowable L1 in 3j symbol.
C
C     THRCOF :OUT Set of 3j coefficients generated by evaluating the
C                 3j symbol for all allowed values of L1.  THRCOF(I)
C                 will contain f(L1MIN+I-1), I=1,2,...,L1MAX+L1MIN+1.
C
C     NDIM :IN    Declared length of THRCOF in calling program.
C
C     IER :OUT    Error flag.
C                 IER=0 No errors.
C                 IER=1 Either L2.LT.ABS(M2) or L3.LT.ABS(M3).
C                 IER=2 Either L2+ABS(M2) or L3+ABS(M3) non-integer.
C                 IER=3 L1MAX-L1MIN not an integer.
C                 IER=4 L1MAX less than L1MIN.
C                 IER=5 NDIM less than L1MAX-L1MIN+1.
C
C *Description:
C
C     Although conventionally the parameters of the vector addition
C  coefficients satisfy certain restrictions, such as being integers
C  or integers plus 1/2, the restrictions imposed on input to this
C  subroutine are somewhat weaker. See, for example, Section 27.9 of
C  Abramowitz and Stegun or Appendix C of Volume II of A. Messiah.
C  The restrictions imposed by this subroutine are
C       1. L2 .GE. ABS(M2) and L3 .GE. ABS(M3);
C       2. L2+ABS(M2) and L3+ABS(M3) must be integers;
C       3. L1MAX-L1MIN must be a non-negative integer, where
C          L1MAX=L2+L3 and L1MIN=MAX(ABS(L2-L3),ABS(M2+M3)).
C  If the conventional restrictions are satisfied, then these
C  restrictions are met.
C
C     The user should be cautious in using input parameters that do
C  not satisfy the conventional restrictions. For example, the
C  the subroutine produces values of
C       f(L1) = ( L1  2.5  5.8)
C               (-0.3 1.5 -1.2)
C  for L1=3.3,4.3,...,8.3 but none of the symmetry properties of the 3j
C  symbol, set forth on page 1056 of Messiah, is satisfied.
C
C     The subroutine generates f(L1MIN), f(L1MIN+1), ..., f(L1MAX)
C  where L1MIN and L1MAX are defined above. The sequence f(L1) is
C  generated by a three-term recurrence algorithm with scaling to
C  control overflow. Both backward and forward recurrence are used to
C  maintain numerical stability. The two recurrence sequences are
C  matched at an interior point and are normalized from the unitary
C  property of 3j coefficients and Wigner's phase convention.
C
C    The algorithm is suited to applications in which large quantum
C  numbers arise, such as in molecular dynamics.
C
C***REFERENCES  1. Abramowitz, M., and Stegun, I. A., Eds., Handbook
C                  of Mathematical Functions with Formulas, Graphs
C                  and Mathematical Tables, NBS Applied Mathematics
C                  Series 55, June 1964 and subsequent printings.
C               2. Messiah, Albert., Quantum Mechanics, Volume II,
C                  North-Holland Publishing Company, 1963.
C               3. Schulten, Klaus and Gordon, Roy G., Exact recursive
C                  evaluation of 3j and 6j coefficients for quantum-
C                  mechanical coupling of angular momenta, J Math
C                  Phys, v 16, no. 10, October 1975, pp. 1961-1970.
C               4. Schulten, Klaus and Gordon, Roy G., Semiclassical
C                  approximations to 3j  and 6j coefficients for
C                  quantum-mechanical coupling of angular momenta,
C                  J Math Phys, v 16, no. 10, October 1975,
C                  pp. 1971-1988.
C               5. Schulten, Klaus and Gordon, Roy G., Recursive
C                  evaluation of 3j and 6j coefficients, Computer
C                  Phys Comm, v 11, 1976, pp. 269-278.
C***ROUTINES CALLED  D1MACH, XERMSG
C***REVISION HISTORY  (YYMMDD)
C   750101  DATE WRITTEN
C   880515  SLATEC prologue added by G. C. Nielson, NBS; parameters
C           HUGE and TINY revised to depend on D1MACH.
C   891229  Prologue description rewritten; other prologue sections
C           revised; LMATCH (location of match point for recurrences)
C           removed from argument list; argument IER changed to serve
C           only as an error flag (previously, in cases without error,
C           it returned the number of scalings); number of error codes
C           increased to provide more precise error information;
C           program comments revised; SLATEC error handler calls
C           introduced to enable printing of error messages to meet
C           SLATEC standards. These changes were done by D. W. Lozier,
C           M. A. McClain and J. M. Smith of the National Institute
C           of Standards and Technology, formerly NBS.
C   910415  Mixed type expressions eliminated; variable C1 initialized;
C           description of THRCOF expanded. These changes were done by
C           D. W. Lozier.
C***END PROLOGUE  DRC3JJ
C
      INTEGER NDIM, IER
      DOUBLE PRECISION L2, L3, M2, M3, L1MIN, L1MAX, THRCOF(NDIM)
C
      INTEGER I, INDEX, LSTEP, N, NFIN, NFINP1, NFINP2, NFINP3, NLIM,
     +        NSTEP2
      DOUBLE PRECISION A1, A1S, A2, A2S, C1, C1OLD, C2, CNORM, D1MACH,
     +                 DENOM, DV, EPS, HUGE, L1, M1, NEWFAC, OLDFAC,
     +                 ONE, RATIO, SIGN1, SIGN2, SRHUGE, SRTINY, SUM1,
     +                 SUM2, SUMBAC, SUMFOR, SUMUNI, THREE, THRESH,
     +                 TINY, TWO, X, X1, X2, X3, Y, Y1, Y2, Y3, ZERO
C
      DATA  ZERO,EPS,ONE,TWO,THREE /0.0D0,0.01D0,1.0D0,2.0D0,3.0D0/
C
C***FIRST EXECUTABLE STATEMENT  DRC3JJ
      IER=0
C  HUGE is the square root of one twentieth of the largest floating
C  point number, approximately.
c      HUGE = SQRT(D1MACH(2)/20.0D0)
      HUGE = SQRT(1.79D+308/20.0D0)
      SRHUGE = SQRT(HUGE)
      TINY = 1.0D0/HUGE
      SRTINY = 1.0D0/SRHUGE
C
C     LMATCH = ZERO
      M1 = - M2 - M3
C
C  Check error conditions 1 and 2.
      IF((L2-ABS(M2)+EPS.LT.ZERO).OR.
     +   (L3-ABS(M3)+EPS.LT.ZERO))THEN
         IER=1
         CALL XERMSG('SLATEC','DRC3JJ','L2-ABS(M2) or L3-ABS(M3) '//
     +      'less than zero.',IER,1)
         RETURN
      ELSEIF((MOD(L2+ABS(M2)+EPS,ONE).GE.EPS+EPS).OR.
     +   (MOD(L3+ABS(M3)+EPS,ONE).GE.EPS+EPS))THEN
         IER=2
         CALL XERMSG('SLATEC','DRC3JJ','L2+ABS(M2) or L3+ABS(M3) '//
     +      'not integer.',IER,1)
         RETURN
      ENDIF
C
C
C
C  Limits for L1
C
      L1MIN = MAX(ABS(L2-L3),ABS(M1))
      L1MAX = L2 + L3
C
C  Check error condition 3.
      IF(MOD(L1MAX-L1MIN+EPS,ONE).GE.EPS+EPS)THEN
         IER=3
         CALL XERMSG('SLATEC','DRC3JJ','L1MAX-L1MIN not integer.',IER,1)
         RETURN
      ENDIF
      IF(L1MIN.LT.L1MAX-EPS)   GO TO 20
      IF(L1MIN.LT.L1MAX+EPS)   GO TO 10
C
C  Check error condition 4.
      IER=4
      CALL XERMSG('SLATEC','DRC3JJ','L1MIN greater than L1MAX.',IER,1)
      RETURN
C
C  This is reached in case that L1 can take only one value,
C  i.e. L1MIN = L1MAX
C
   10 CONTINUE
C     LSCALE = 0
      THRCOF(1) = (-ONE) ** INT(ABS(L2+M2-L3+M3)+EPS) /
     1 SQRT(L1MIN + L2 + L3 + ONE)
      RETURN
C
C  This is reached in case that L1 takes more than one value,
C  i.e. L1MIN < L1MAX.
C
   20 CONTINUE
C     LSCALE = 0
      NFIN = INT(L1MAX-L1MIN+ONE+EPS)
      IF(NDIM-NFIN)  21, 23, 23
C
C  Check error condition 5.
   21 IER = 5
      CALL XERMSG('SLATEC','DRC3JJ','Dimension of result array for '//
     +            '3j coefficients too small.',IER,1)
      RETURN
C
C
C  Starting forward recursion from L1MIN taking NSTEP1 steps
C
   23 L1 = L1MIN
      NEWFAC = 0.0D0
      C1 = 0.0D0
      THRCOF(1) = SRTINY
      SUM1 = (L1+L1+ONE) * TINY
C
C
      LSTEP = 1
   30 LSTEP = LSTEP + 1
      L1 = L1 + ONE
C
C
      OLDFAC = NEWFAC
      A1 = (L1+L2+L3+ONE) * (L1-L2+L3) * (L1+L2-L3) * (-L1+L2+L3+ONE)
      A2 = (L1+M1) * (L1-M1)
      NEWFAC = SQRT(A1*A2)
      IF(L1.LT.ONE+EPS)   GO TO 40
C
C
      DV = - L2*(L2+ONE) * M1 + L3*(L3+ONE) * M1 + L1*(L1-ONE) * (M3-M2)
      DENOM = (L1-ONE) * NEWFAC
C
      IF(LSTEP-2)  32, 32, 31
C
   31 C1OLD = ABS(C1)
   32 C1 = - (L1+L1-ONE) * DV / DENOM
      GO TO 50
C
C  If L1 = 1, (L1-1) has to be factored out of DV, hence
C
   40 C1 = - (L1+L1-ONE) * L1 * (M3-M2) / NEWFAC
C
   50 IF(LSTEP.GT.2)   GO TO 60
C
C
C  If L1 = L1MIN + 1, the third term in the recursion equation vanishes,
C  hence
      X = SRTINY * C1
      THRCOF(2) = X
      SUM1 = SUM1 + TINY * (L1+L1+ONE) * C1*C1
      IF(LSTEP.EQ.NFIN)   GO TO 220
      GO TO 30
C
C
   60 C2 = - L1 * OLDFAC / DENOM
C
C  Recursion to the next 3j coefficient X
C
      X = C1 * THRCOF(LSTEP-1) + C2 * THRCOF(LSTEP-2)
      THRCOF(LSTEP) = X
      SUMFOR = SUM1
      SUM1 = SUM1 + (L1+L1+ONE) * X*X
      IF(LSTEP.EQ.NFIN)   GO TO 100
C
C  See if last unnormalized 3j coefficient exceeds SRHUGE
C
      IF(ABS(X).LT.SRHUGE)   GO TO 80
C
C  This is reached if last 3j coefficient larger than SRHUGE,
C  so that the recursion series THRCOF(1), ... , THRCOF(LSTEP)
C  has to be rescaled to prevent overflow
C
C     LSCALE = LSCALE + 1
      DO 70 I=1,LSTEP
      IF(ABS(THRCOF(I)).LT.SRTINY)   THRCOF(I) = ZERO
   70 THRCOF(I) = THRCOF(I) / SRHUGE
      SUM1 = SUM1 / HUGE
      SUMFOR = SUMFOR / HUGE
      X = X / SRHUGE
C
C  As long as ABS(C1) is decreasing, the recursion proceeds towards
C  increasing 3j values and, hence, is numerically stable.  Once
C  an increase of ABS(C1) is detected, the recursion direction is
C  reversed.
C
   80 IF(C1OLD-ABS(C1))   100, 100, 30
C
C
C  Keep three 3j coefficients around LMATCH for comparison with
C  backward recursion.
C
  100 CONTINUE
C     LMATCH = L1 - 1
      X1 = X
      X2 = THRCOF(LSTEP-1)
      X3 = THRCOF(LSTEP-2)
      NSTEP2 = NFIN - LSTEP + 3
C
C
C
C
C  Starting backward recursion from L1MAX taking NSTEP2 steps, so
C  that forward and backward recursion overlap at three points
C  L1 = LMATCH+1, LMATCH, LMATCH-1.
C
      NFINP1 = NFIN + 1
      NFINP2 = NFIN + 2
      NFINP3 = NFIN + 3
      L1 = L1MAX
      THRCOF(NFIN) = SRTINY
      SUM2 = TINY * (L1+L1+ONE)
C
      L1 = L1 + TWO
      LSTEP = 1
  110 LSTEP = LSTEP + 1
      L1 = L1 - ONE
C
      OLDFAC = NEWFAC
      A1S = (L1+L2+L3)*(L1-L2+L3-ONE)*(L1+L2-L3-ONE)*(-L1+L2+L3+TWO)
      A2S = (L1+M1-ONE) * (L1-M1-ONE)
      NEWFAC = SQRT(A1S*A2S)
C
      DV = - L2*(L2+ONE) * M1 + L3*(L3+ONE) * M1 + L1*(L1-ONE) * (M3-M2)
C
      DENOM = L1 * NEWFAC
      C1 = - (L1+L1-ONE) * DV / DENOM
      IF(LSTEP.GT.2)   GO TO 120
C
C  If L1 = L1MAX + 1, the third term in the recursion formula vanishes
C
      Y = SRTINY * C1
      THRCOF(NFIN-1) = Y
      SUMBAC = SUM2
      SUM2 = SUM2 + TINY * (L1+L1-THREE) * C1*C1
C
      GO TO 110
C
C
  120 C2 = - (L1 - ONE) * OLDFAC / DENOM
C
C  Recursion to the next 3j coefficient Y
C
      Y = C1 * THRCOF(NFINP2-LSTEP) + C2 * THRCOF(NFINP3-LSTEP)
C
      IF(LSTEP.EQ.NSTEP2)   GO TO 200
C
      THRCOF(NFINP1-LSTEP) = Y
      SUMBAC = SUM2
      SUM2 = SUM2 + (L1+L1-THREE) * Y*Y
C
C  See if last unnormalized 3j coefficient exceeds SRHUGE
C
      IF(ABS(Y).LT.SRHUGE)   GO TO 110
C
C  This is reached if last 3j coefficient larger than SRHUGE,
C  so that the recursion series THRCOF(NFIN), ... ,THRCOF(NFIN-LSTEP+1)
C  has to be rescaled to prevent overflow
C
C     LSCALE = LSCALE + 1
      DO 130 I=1,LSTEP
      INDEX = NFIN - I + 1
      IF(ABS(THRCOF(INDEX)).LT.SRTINY)   THRCOF(INDEX) = ZERO
  130 THRCOF(INDEX) = THRCOF(INDEX) / SRHUGE
      SUM2 = SUM2 / HUGE
      SUMBAC = SUMBAC / HUGE
C
C
      GO TO 110
C
C
C  The forward recursion 3j coefficients X1, X2, X3 are to be matched
C  with the corresponding backward recursion values Y1, Y2, Y3.
C
  200 Y3 = Y
      Y2 = THRCOF(NFINP2-LSTEP)
      Y1 = THRCOF(NFINP3-LSTEP)
C
C
C  Determine now RATIO such that YI = RATIO * XI  (I=1,2,3) holds
C  with minimal error.
C
      RATIO = ( X1*Y1 + X2*Y2 + X3*Y3 ) / ( X1*X1 + X2*X2 + X3*X3 )
      NLIM = NFIN - NSTEP2 + 1
C
      IF(ABS(RATIO).LT.ONE)   GO TO 211
C
      DO 210 N=1,NLIM
  210 THRCOF(N) = RATIO * THRCOF(N)
      SUMUNI = RATIO * RATIO * SUMFOR + SUMBAC
      GO TO 230
C
  211 NLIM = NLIM + 1
      RATIO = ONE / RATIO
      DO 212 N=NLIM,NFIN
  212 THRCOF(N) = RATIO * THRCOF(N)
      SUMUNI = SUMFOR + RATIO*RATIO*SUMBAC
      GO TO 230
C
  220 SUMUNI = SUM1
C
C
C  Normalize 3j coefficients
C
  230 CNORM = ONE / SQRT(SUMUNI)
C
C  Sign convention for last 3j coefficient determines overall phase
C
      SIGN1 = SIGN(ONE,THRCOF(NFIN))
      SIGN2 = (-ONE) ** INT(ABS(L2+M2-L3+M3)+EPS)
      IF(SIGN1*SIGN2) 235,235,236
  235 CNORM = - CNORM
C
  236 IF(ABS(CNORM).LT.ONE)   GO TO 250
C
      DO 240 N=1,NFIN
  240 THRCOF(N) = CNORM * THRCOF(N)
      RETURN
C
  250 THRESH = TINY / ABS(CNORM)
      DO 251 N=1,NFIN
      IF(ABS(THRCOF(N)).LT.THRESH)   THRCOF(N) = ZERO
  251 THRCOF(N) = CNORM * THRCOF(N)
C
      RETURN
      END

c*************************************************************************
*DECK D1MACH
      DOUBLE PRECISION FUNCTION D1MACH(I)
C***BEGIN PROLOGUE  D1MACH
C***PURPOSE  Return floating point machine dependent constants.
C***LIBRARY   SLATEC
C***CATEGORY  R1
C***TYPE      DOUBLE PRECISION (R1MACH-S, D1MACH-D)
C***KEYWORDS  MACHINE CONSTANTS
C***AUTHOR  Fox, P. A., (Bell Labs)
C           Hall, A. D., (Bell Labs)
C           Schryer, N. L., (Bell Labs)
C***DESCRIPTION
C
C   D1MACH can be used to obtain machine-dependent parameters for the
C   local machine environment.  It is a function subprogram with one
C   (input) argument, and can be referenced as follows:
C
C        D = D1MACH(I)
C
C   where I=1,...,5.  The (output) value of D above is determined by
C   the (input) value of I.  The results for various values of I are
C   discussed below.
C
C   D1MACH( 1) = B**(EMIN-1), the smallest positive magnitude.
C   D1MACH( 2) = B**EMAX*(1 - B**(-T)), the largest magnitude.
C   D1MACH( 3) = B**(-T), the smallest relative spacing.
C   D1MACH( 4) = B**(1-T), the largest relative spacing.
C   D1MACH( 5) = LOG10(B)
C
C   Assume double precision numbers are represented in the T-digit,
C   base-B form
C
C              sign (B**E)*( (X(1)/B) + ... + (X(T)/B**T) )
C
C   where 0 .LE. X(I) .LT. B for I=1,...,T, 0 .LT. X(1), and
C   EMIN .LE. E .LE. EMAX.
C
C   The values of B, T, EMIN and EMAX are provided in I1MACH as
C   follows:
C   I1MACH(10) = B, the base.
C   I1MACH(14) = T, the number of base-B digits.
C   I1MACH(15) = EMIN, the smallest exponent E.
C   I1MACH(16) = EMAX, the largest exponent E.
C
C   To alter this function for a particular environment, the desired
C   set of DATA statements should be activated by removing the C from
C   column 1.  Also, the values of D1MACH(1) - D1MACH(4) should be
C   checked for consistency with the local operating system.
C
C***REFERENCES  P. A. Fox, A. D. Hall and N. L. Schryer, Framework for
C                 a portable library, ACM Transactions on Mathematical
C                 Software 4, 2 (June 1978), pp. 177-188.
C***ROUTINES CALLED  XERMSG
C***REVISION HISTORY  (YYMMDD)
C   750101  DATE WRITTEN
C   890213  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900315  CALLs to XERROR changed to CALLs to XERMSG.  (THJ)
C   900618  Added DEC RISC constants.  (WRB)
C   900723  Added IBM RS 6000 constants.  (WRB)
C   900911  Added SUN 386i constants.  (WRB)
C   910710  Added HP 730 constants.  (SMR)
C   911114  Added Convex IEEE constants.  (WRB)
C   920121  Added SUN -r8 compiler option constants.  (WRB)
C   920229  Added Touchstone Delta i860 constants.  (WRB)
C   920501  Reformatted the REFERENCES section.  (WRB)
C   920625  Added CONVEX -p8 and -pd8 compiler option constants.
C           (BKS, WRB)
C   930201  Added DEC Alpha and SGI constants.  (RWC and WRB)
C***END PROLOGUE  D1MACH
C
      INTEGER SMALL(4)
      INTEGER LARGE(4)
      INTEGER RIGHT(4)
      INTEGER DIVER(4)
      INTEGER LOG10(4)
C
      DOUBLE PRECISION DMACH(5)
      SAVE DMACH
C
      EQUIVALENCE (DMACH(1),SMALL(1))
      EQUIVALENCE (DMACH(2),LARGE(1))
      EQUIVALENCE (DMACH(3),RIGHT(1))
      EQUIVALENCE (DMACH(4),DIVER(1))
      EQUIVALENCE (DMACH(5),LOG10(1))
C
C     MACHINE CONSTANTS FOR THE AMIGA
C     ABSOFT FORTRAN COMPILER USING THE 68020/68881 COMPILER OPTION
C
C     DATA SMALL(1), SMALL(2) / Z'00100000', Z'00000000' /
C     DATA LARGE(1), LARGE(2) / Z'7FEFFFFF', Z'FFFFFFFF' /
C     DATA RIGHT(1), RIGHT(2) / Z'3CA00000', Z'00000000' /
C     DATA DIVER(1), DIVER(2) / Z'3CB00000', Z'00000000' /
C     DATA LOG10(1), LOG10(2) / Z'3FD34413', Z'509F79FF' /
C
C     MACHINE CONSTANTS FOR THE AMIGA
C     ABSOFT FORTRAN COMPILER USING SOFTWARE FLOATING POINT
C
C     DATA SMALL(1), SMALL(2) / Z'00100000', Z'00000000' /
C     DATA LARGE(1), LARGE(2) / Z'7FDFFFFF', Z'FFFFFFFF' /
C     DATA RIGHT(1), RIGHT(2) / Z'3CA00000', Z'00000000' /
C     DATA DIVER(1), DIVER(2) / Z'3CB00000', Z'00000000' /
C     DATA LOG10(1), LOG10(2) / Z'3FD34413', Z'509F79FF' /
C
C     MACHINE CONSTANTS FOR THE APOLLO
C
C     DATA SMALL(1), SMALL(2) / 16#00100000, 16#00000000 /
C     DATA LARGE(1), LARGE(2) / 16#7FFFFFFF, 16#FFFFFFFF /
C     DATA RIGHT(1), RIGHT(2) / 16#3CA00000, 16#00000000 /
C     DATA DIVER(1), DIVER(2) / 16#3CB00000, 16#00000000 /
C     DATA LOG10(1), LOG10(2) / 16#3FD34413, 16#509F79FF /
C
C     MACHINE CONSTANTS FOR THE BURROUGHS 1700 SYSTEM
C
C     DATA SMALL(1) / ZC00800000 /
C     DATA SMALL(2) / Z000000000 /
C     DATA LARGE(1) / ZDFFFFFFFF /
C     DATA LARGE(2) / ZFFFFFFFFF /
C     DATA RIGHT(1) / ZCC5800000 /
C     DATA RIGHT(2) / Z000000000 /
C     DATA DIVER(1) / ZCC6800000 /
C     DATA DIVER(2) / Z000000000 /
C     DATA LOG10(1) / ZD00E730E7 /
C     DATA LOG10(2) / ZC77800DC0 /
C
C     MACHINE CONSTANTS FOR THE BURROUGHS 5700 SYSTEM
C
C     DATA SMALL(1) / O1771000000000000 /
C     DATA SMALL(2) / O0000000000000000 /
C     DATA LARGE(1) / O0777777777777777 /
C     DATA LARGE(2) / O0007777777777777 /
C     DATA RIGHT(1) / O1461000000000000 /
C     DATA RIGHT(2) / O0000000000000000 /
C     DATA DIVER(1) / O1451000000000000 /
C     DATA DIVER(2) / O0000000000000000 /
C     DATA LOG10(1) / O1157163034761674 /
C     DATA LOG10(2) / O0006677466732724 /
C
C     MACHINE CONSTANTS FOR THE BURROUGHS 6700/7700 SYSTEMS
C
C     DATA SMALL(1) / O1771000000000000 /
C     DATA SMALL(2) / O7770000000000000 /
C     DATA LARGE(1) / O0777777777777777 /
C     DATA LARGE(2) / O7777777777777777 /
C     DATA RIGHT(1) / O1461000000000000 /
C     DATA RIGHT(2) / O0000000000000000 /
C     DATA DIVER(1) / O1451000000000000 /
C     DATA DIVER(2) / O0000000000000000 /
C     DATA LOG10(1) / O1157163034761674 /
C     DATA LOG10(2) / O0006677466732724 /
C
C     MACHINE CONSTANTS FOR THE CDC 170/180 SERIES USING NOS/VE
C
C     DATA SMALL(1) / Z"3001800000000000" /
C     DATA SMALL(2) / Z"3001000000000000" /
C     DATA LARGE(1) / Z"4FFEFFFFFFFFFFFE" /
C     DATA LARGE(2) / Z"4FFE000000000000" /
C     DATA RIGHT(1) / Z"3FD2800000000000" /
C     DATA RIGHT(2) / Z"3FD2000000000000" /
C     DATA DIVER(1) / Z"3FD3800000000000" /
C     DATA DIVER(2) / Z"3FD3000000000000" /
C     DATA LOG10(1) / Z"3FFF9A209A84FBCF" /
C     DATA LOG10(2) / Z"3FFFF7988F8959AC" /
C
C     MACHINE CONSTANTS FOR THE CDC 6000/7000 SERIES
C
C     DATA SMALL(1) / 00564000000000000000B /
C     DATA SMALL(2) / 00000000000000000000B /
C     DATA LARGE(1) / 37757777777777777777B /
C     DATA LARGE(2) / 37157777777777777777B /
C     DATA RIGHT(1) / 15624000000000000000B /
C     DATA RIGHT(2) / 00000000000000000000B /
C     DATA DIVER(1) / 15634000000000000000B /
C     DATA DIVER(2) / 00000000000000000000B /
C     DATA LOG10(1) / 17164642023241175717B /
C     DATA LOG10(2) / 16367571421742254654B /
C
C     MACHINE CONSTANTS FOR THE CELERITY C1260
C
C     DATA SMALL(1), SMALL(2) / Z'00100000', Z'00000000' /
C     DATA LARGE(1), LARGE(2) / Z'7FEFFFFF', Z'FFFFFFFF' /
C     DATA RIGHT(1), RIGHT(2) / Z'3CA00000', Z'00000000' /
C     DATA DIVER(1), DIVER(2) / Z'3CB00000', Z'00000000' /
C     DATA LOG10(1), LOG10(2) / Z'3FD34413', Z'509F79FF' /
C
C     MACHINE CONSTANTS FOR THE CONVEX
C     USING THE -fn OR -pd8 COMPILER OPTION
C
C     DATA DMACH(1) / Z'0010000000000000' /
C     DATA DMACH(2) / Z'7FFFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3CC0000000000000' /
C     DATA DMACH(4) / Z'3CD0000000000000' /
C     DATA DMACH(5) / Z'3FF34413509F79FF' /
C
C     MACHINE CONSTANTS FOR THE CONVEX
C     USING THE -fi COMPILER OPTION
C
C     DATA DMACH(1) / Z'0010000000000000' /
C     DATA DMACH(2) / Z'7FEFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3CA0000000000000' /
C     DATA DMACH(4) / Z'3CB0000000000000' /
C     DATA DMACH(5) / Z'3FD34413509F79FF' /
C
C     MACHINE CONSTANTS FOR THE CONVEX
C     USING THE -p8 COMPILER OPTION
C
C     DATA DMACH(1) / Z'00010000000000000000000000000000' /
C     DATA DMACH(2) / Z'7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3F900000000000000000000000000000' /
C     DATA DMACH(4) / Z'3F910000000000000000000000000000' /
C     DATA DMACH(5) / Z'3FFF34413509F79FEF311F12B35816F9' /
C
C     MACHINE CONSTANTS FOR THE CRAY
C
C     DATA SMALL(1) / 201354000000000000000B /
C     DATA SMALL(2) / 000000000000000000000B /
C     DATA LARGE(1) / 577767777777777777777B /
C     DATA LARGE(2) / 000007777777777777774B /
C     DATA RIGHT(1) / 376434000000000000000B /
C     DATA RIGHT(2) / 000000000000000000000B /
C     DATA DIVER(1) / 376444000000000000000B /
C     DATA DIVER(2) / 000000000000000000000B /
C     DATA LOG10(1) / 377774642023241175717B /
C     DATA LOG10(2) / 000007571421742254654B /
C
C     MACHINE CONSTANTS FOR THE DATA GENERAL ECLIPSE S/200
C     NOTE - IT MAY BE APPROPRIATE TO INCLUDE THE FOLLOWING CARD -
C     STATIC DMACH(5)
C
C     DATA SMALL /    20K, 3*0 /
C     DATA LARGE / 77777K, 3*177777K /
C     DATA RIGHT / 31420K, 3*0 /
C     DATA DIVER / 32020K, 3*0 /
C     DATA LOG10 / 40423K, 42023K, 50237K, 74776K /
C
C     MACHINE CONSTANTS FOR THE DEC ALPHA
C     USING G_FLOAT
C
C     DATA DMACH(1) / '0000000000000010'X /
C     DATA DMACH(2) / 'FFFFFFFFFFFF7FFF'X /
C     DATA DMACH(3) / '0000000000003CC0'X /
C     DATA DMACH(4) / '0000000000003CD0'X /
C     DATA DMACH(5) / '79FF509F44133FF3'X /
C
C     MACHINE CONSTANTS FOR THE DEC ALPHA
C     USING IEEE_FORMAT
C
C     DATA DMACH(1) / '0010000000000000'X /
C     DATA DMACH(2) / '7FEFFFFFFFFFFFFF'X /
C     DATA DMACH(3) / '3CA0000000000000'X /
C     DATA DMACH(4) / '3CB0000000000000'X /
C     DATA DMACH(5) / '3FD34413509F79FF'X /
C
C     MACHINE CONSTANTS FOR THE DEC RISC
C
C     DATA SMALL(1), SMALL(2) / Z'00000000', Z'00100000'/
C     DATA LARGE(1), LARGE(2) / Z'FFFFFFFF', Z'7FEFFFFF'/
C     DATA RIGHT(1), RIGHT(2) / Z'00000000', Z'3CA00000'/
C     DATA DIVER(1), DIVER(2) / Z'00000000', Z'3CB00000'/
C     DATA LOG10(1), LOG10(2) / Z'509F79FF', Z'3FD34413'/
C
C     MACHINE CONSTANTS FOR THE DEC VAX
C     USING D_FLOATING
C     (EXPRESSED IN INTEGER AND HEXADECIMAL)
C     THE HEX FORMAT BELOW MAY NOT BE SUITABLE FOR UNIX SYSTEMS
C     THE INTEGER FORMAT SHOULD BE OK FOR UNIX SYSTEMS
C
C     DATA SMALL(1), SMALL(2) /        128,           0 /
C     DATA LARGE(1), LARGE(2) /     -32769,          -1 /
C     DATA RIGHT(1), RIGHT(2) /       9344,           0 /
C     DATA DIVER(1), DIVER(2) /       9472,           0 /
C     DATA LOG10(1), LOG10(2) /  546979738,  -805796613 /
C
C     DATA SMALL(1), SMALL(2) / Z00000080, Z00000000 /
C     DATA LARGE(1), LARGE(2) / ZFFFF7FFF, ZFFFFFFFF /
C     DATA RIGHT(1), RIGHT(2) / Z00002480, Z00000000 /
C     DATA DIVER(1), DIVER(2) / Z00002500, Z00000000 /
C     DATA LOG10(1), LOG10(2) / Z209A3F9A, ZCFF884FB /
C
C     MACHINE CONSTANTS FOR THE DEC VAX
C     USING G_FLOATING
C     (EXPRESSED IN INTEGER AND HEXADECIMAL)
C     THE HEX FORMAT BELOW MAY NOT BE SUITABLE FOR UNIX SYSTEMS
C     THE INTEGER FORMAT SHOULD BE OK FOR UNIX SYSTEMS
C
C     DATA SMALL(1), SMALL(2) /         16,           0 /
C     DATA LARGE(1), LARGE(2) /     -32769,          -1 /
C     DATA RIGHT(1), RIGHT(2) /      15552,           0 /
C     DATA DIVER(1), DIVER(2) /      15568,           0 /
C     DATA LOG10(1), LOG10(2) /  1142112243, 2046775455 /
C
C     DATA SMALL(1), SMALL(2) / Z00000010, Z00000000 /
C     DATA LARGE(1), LARGE(2) / ZFFFF7FFF, ZFFFFFFFF /
C     DATA RIGHT(1), RIGHT(2) / Z00003CC0, Z00000000 /
C     DATA DIVER(1), DIVER(2) / Z00003CD0, Z00000000 /
C     DATA LOG10(1), LOG10(2) / Z44133FF3, Z79FF509F /
C
C     MACHINE CONSTANTS FOR THE ELXSI 6400
C     (ASSUMING REAL*8 IS THE DEFAULT DOUBLE PRECISION)
C
C     DATA SMALL(1), SMALL(2) / '00100000'X,'00000000'X /
C     DATA LARGE(1), LARGE(2) / '7FEFFFFF'X,'FFFFFFFF'X /
C     DATA RIGHT(1), RIGHT(2) / '3CB00000'X,'00000000'X /
C     DATA DIVER(1), DIVER(2) / '3CC00000'X,'00000000'X /
C     DATA LOG10(1), LOG10(2) / '3FD34413'X,'509F79FF'X /
C
C     MACHINE CONSTANTS FOR THE HARRIS 220
C
C     DATA SMALL(1), SMALL(2) / '20000000, '00000201 /
C     DATA LARGE(1), LARGE(2) / '37777777, '37777577 /
C     DATA RIGHT(1), RIGHT(2) / '20000000, '00000333 /
C     DATA DIVER(1), DIVER(2) / '20000000, '00000334 /
C     DATA LOG10(1), LOG10(2) / '23210115, '10237777 /
C
C     MACHINE CONSTANTS FOR THE HONEYWELL 600/6000 SERIES
C
C     DATA SMALL(1), SMALL(2) / O402400000000, O000000000000 /
C     DATA LARGE(1), LARGE(2) / O376777777777, O777777777777 /
C     DATA RIGHT(1), RIGHT(2) / O604400000000, O000000000000 /
C     DATA DIVER(1), DIVER(2) / O606400000000, O000000000000 /
C     DATA LOG10(1), LOG10(2) / O776464202324, O117571775714 /
C
C     MACHINE CONSTANTS FOR THE HP 730
C
C     DATA DMACH(1) / Z'0010000000000000' /
C     DATA DMACH(2) / Z'7FEFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3CA0000000000000' /
C     DATA DMACH(4) / Z'3CB0000000000000' /
C     DATA DMACH(5) / Z'3FD34413509F79FF' /
C
C     MACHINE CONSTANTS FOR THE HP 2100
C     THREE WORD DOUBLE PRECISION OPTION WITH FTN4
C
C     DATA SMALL(1), SMALL(2), SMALL(3) / 40000B,       0,       1 /
C     DATA LARGE(1), LARGE(2), LARGE(3) / 77777B, 177777B, 177776B /
C     DATA RIGHT(1), RIGHT(2), RIGHT(3) / 40000B,       0,    265B /
C     DATA DIVER(1), DIVER(2), DIVER(3) / 40000B,       0,    276B /
C     DATA LOG10(1), LOG10(2), LOG10(3) / 46420B,  46502B,  77777B /
C
C     MACHINE CONSTANTS FOR THE HP 2100
C     FOUR WORD DOUBLE PRECISION OPTION WITH FTN4
C
C     DATA SMALL(1), SMALL(2) /  40000B,       0 /
C     DATA SMALL(3), SMALL(4) /       0,       1 /
C     DATA LARGE(1), LARGE(2) /  77777B, 177777B /
C     DATA LARGE(3), LARGE(4) / 177777B, 177776B /
C     DATA RIGHT(1), RIGHT(2) /  40000B,       0 /
C     DATA RIGHT(3), RIGHT(4) /       0,    225B /
C     DATA DIVER(1), DIVER(2) /  40000B,       0 /
C     DATA DIVER(3), DIVER(4) /       0,    227B /
C     DATA LOG10(1), LOG10(2) /  46420B,  46502B /
C     DATA LOG10(3), LOG10(4) /  76747B, 176377B /
C
C     MACHINE CONSTANTS FOR THE HP 9000
C
C     DATA SMALL(1), SMALL(2) / 00040000000B, 00000000000B /
C     DATA LARGE(1), LARGE(2) / 17737777777B, 37777777777B /
C     DATA RIGHT(1), RIGHT(2) / 07454000000B, 00000000000B /
C     DATA DIVER(1), DIVER(2) / 07460000000B, 00000000000B /
C     DATA LOG10(1), LOG10(2) / 07764642023B, 12047674777B /
C
C     MACHINE CONSTANTS FOR THE IBM 360/370 SERIES,
C     THE XEROX SIGMA 5/7/9, THE SEL SYSTEMS 85/86, AND
C     THE PERKIN ELMER (INTERDATA) 7/32.
C
C     DATA SMALL(1), SMALL(2) / Z00100000, Z00000000 /
C     DATA LARGE(1), LARGE(2) / Z7FFFFFFF, ZFFFFFFFF /
C     DATA RIGHT(1), RIGHT(2) / Z33100000, Z00000000 /
C     DATA DIVER(1), DIVER(2) / Z34100000, Z00000000 /
C     DATA LOG10(1), LOG10(2) / Z41134413, Z509F79FF /
C
C     MACHINE CONSTANTS FOR THE IBM PC
C     ASSUMES THAT ALL ARITHMETIC IS DONE IN DOUBLE PRECISION
C     ON 8088, I.E., NOT IN 80 BIT FORM FOR THE 8087.
C
C      DATA SMALL(1) / 2.23D-308  /
C      DATA LARGE(1) / 1.79D+308  /
C      DATA RIGHT(1) / 1.11D-16   /
C      DATA DIVER(1) / 2.22D-16   /
C      DATA LOG10(1) / 0.301029995663981195D0 /
C
C     MACHINE CONSTANTS FOR THE IBM RS 6000
C
C     DATA DMACH(1) / Z'0010000000000000' /
C     DATA DMACH(2) / Z'7FEFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3CA0000000000000' /
C     DATA DMACH(4) / Z'3CB0000000000000' /
C     DATA DMACH(5) / Z'3FD34413509F79FF' /
C
C     MACHINE CONSTANTS FOR THE INTEL i860
C
C     DATA DMACH(1) / Z'0010000000000000' /
C     DATA DMACH(2) / Z'7FEFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3CA0000000000000' /
C     DATA DMACH(4) / Z'3CB0000000000000' /
C     DATA DMACH(5) / Z'3FD34413509F79FF' /
C
C     MACHINE CONSTANTS FOR THE PDP-10 (KA PROCESSOR)
C
C     DATA SMALL(1), SMALL(2) / "033400000000, "000000000000 /
C     DATA LARGE(1), LARGE(2) / "377777777777, "344777777777 /
C     DATA RIGHT(1), RIGHT(2) / "113400000000, "000000000000 /
C     DATA DIVER(1), DIVER(2) / "114400000000, "000000000000 /
C     DATA LOG10(1), LOG10(2) / "177464202324, "144117571776 /
C
C     MACHINE CONSTANTS FOR THE PDP-10 (KI PROCESSOR)
C
C     DATA SMALL(1), SMALL(2) / "000400000000, "000000000000 /
C     DATA LARGE(1), LARGE(2) / "377777777777, "377777777777 /
C     DATA RIGHT(1), RIGHT(2) / "103400000000, "000000000000 /
C     DATA DIVER(1), DIVER(2) / "104400000000, "000000000000 /
C     DATA LOG10(1), LOG10(2) / "177464202324, "476747767461 /
C
C     MACHINE CONSTANTS FOR PDP-11 FORTRAN SUPPORTING
C     32-BIT INTEGERS (EXPRESSED IN INTEGER AND OCTAL).
C
C     DATA SMALL(1), SMALL(2) /    8388608,           0 /
C     DATA LARGE(1), LARGE(2) / 2147483647,          -1 /
C     DATA RIGHT(1), RIGHT(2) /  612368384,           0 /
C     DATA DIVER(1), DIVER(2) /  620756992,           0 /
C     DATA LOG10(1), LOG10(2) / 1067065498, -2063872008 /
C
C     DATA SMALL(1), SMALL(2) / O00040000000, O00000000000 /
C     DATA LARGE(1), LARGE(2) / O17777777777, O37777777777 /
C     DATA RIGHT(1), RIGHT(2) / O04440000000, O00000000000 /
C     DATA DIVER(1), DIVER(2) / O04500000000, O00000000000 /
C     DATA LOG10(1), LOG10(2) / O07746420232, O20476747770 /
C
C     MACHINE CONSTANTS FOR PDP-11 FORTRAN SUPPORTING
C     16-BIT INTEGERS (EXPRESSED IN INTEGER AND OCTAL).
C
C     DATA SMALL(1), SMALL(2) /    128,      0 /
C     DATA SMALL(3), SMALL(4) /      0,      0 /
C     DATA LARGE(1), LARGE(2) /  32767,     -1 /
C     DATA LARGE(3), LARGE(4) /     -1,     -1 /
C     DATA RIGHT(1), RIGHT(2) /   9344,      0 /
C     DATA RIGHT(3), RIGHT(4) /      0,      0 /
C     DATA DIVER(1), DIVER(2) /   9472,      0 /
C     DATA DIVER(3), DIVER(4) /      0,      0 /
C     DATA LOG10(1), LOG10(2) /  16282,   8346 /
C     DATA LOG10(3), LOG10(4) / -31493, -12296 /
C
C     DATA SMALL(1), SMALL(2) / O000200, O000000 /
C     DATA SMALL(3), SMALL(4) / O000000, O000000 /
C     DATA LARGE(1), LARGE(2) / O077777, O177777 /
C     DATA LARGE(3), LARGE(4) / O177777, O177777 /
C     DATA RIGHT(1), RIGHT(2) / O022200, O000000 /
C     DATA RIGHT(3), RIGHT(4) / O000000, O000000 /
C     DATA DIVER(1), DIVER(2) / O022400, O000000 /
C     DATA DIVER(3), DIVER(4) / O000000, O000000 /
C     DATA LOG10(1), LOG10(2) / O037632, O020232 /
C     DATA LOG10(3), LOG10(4) / O102373, O147770 /
C
C     MACHINE CONSTANTS FOR THE SILICON GRAPHICS
C
C     DATA SMALL(1), SMALL(2) / Z'00100000', Z'00000000' /
C     DATA LARGE(1), LARGE(2) / Z'7FEFFFFF', Z'FFFFFFFF' /
C     DATA RIGHT(1), RIGHT(2) / Z'3CA00000', Z'00000000' /
C     DATA DIVER(1), DIVER(2) / Z'3CB00000', Z'00000000' /
C     DATA LOG10(1), LOG10(2) / Z'3FD34413', Z'509F79FF' /
C
C     MACHINE CONSTANTS FOR THE SUN
C
C     DATA DMACH(1) / Z'0010000000000000' /
C     DATA DMACH(2) / Z'7FEFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3CA0000000000000' /
C     DATA DMACH(4) / Z'3CB0000000000000' /
C     DATA DMACH(5) / Z'3FD34413509F79FF' /
C
C     MACHINE CONSTANTS FOR THE SUN
C     USING THE -r8 COMPILER OPTION
C
C     DATA DMACH(1) / Z'00010000000000000000000000000000' /
C     DATA DMACH(2) / Z'7FFEFFFFFFFFFFFFFFFFFFFFFFFFFFFF' /
C     DATA DMACH(3) / Z'3F8E0000000000000000000000000000' /
C     DATA DMACH(4) / Z'3F8F0000000000000000000000000000' /
C     DATA DMACH(5) / Z'3FFD34413509F79FEF311F12B35816F9' /
C
C     MACHINE CONSTANTS FOR THE SUN 386i
C
C     DATA SMALL(1), SMALL(2) / Z'FFFFFFFD', Z'000FFFFF' /
C     DATA LARGE(1), LARGE(2) / Z'FFFFFFB0', Z'7FEFFFFF' /
C     DATA RIGHT(1), RIGHT(2) / Z'000000B0', Z'3CA00000' /
C     DATA DIVER(1), DIVER(2) / Z'FFFFFFCB', Z'3CAFFFFF'
C     DATA LOG10(1), LOG10(2) / Z'509F79E9', Z'3FD34413' /
C
C     MACHINE CONSTANTS FOR THE UNIVAC 1100 SERIES FTN COMPILER
C
C     DATA SMALL(1), SMALL(2) / O000040000000, O000000000000 /
C     DATA LARGE(1), LARGE(2) / O377777777777, O777777777777 /
C     DATA RIGHT(1), RIGHT(2) / O170540000000, O000000000000 /
C     DATA DIVER(1), DIVER(2) / O170640000000, O000000000000 /
C     DATA LOG10(1), LOG10(2) / O177746420232, O411757177572 /
C
C***FIRST EXECUTABLE STATEMENT  D1MACH
      IF (I .LT. 1 .OR. I .GT. 5) CALL XERMSG ('SLATEC', 'D1MACH',
     +   'I OUT OF BOUNDS', 1, 2)
C
      D1MACH = DMACH(I)
      RETURN
C
      END

c*************************************************************************
*DECK FDUMP
      SUBROUTINE FDUMP
C***BEGIN PROLOGUE  FDUMP
C***PURPOSE  Symbolic dump (should be locally written).
C***LIBRARY   SLATEC (XERROR)
C***CATEGORY  R3
C***TYPE      ALL (FDUMP-A)
C***KEYWORDS  ERROR, XERMSG
C***AUTHOR  Jones, R. E., (SNLA)
C***DESCRIPTION
C
C        ***Note*** Machine Dependent Routine
C        FDUMP is intended to be replaced by a locally written
C        version which produces a symbolic dump.  Failing this,
C        it should be replaced by a version which prints the
C        subprogram nesting list.  Note that this dump must be
C        printed on each of up to five files, as indicated by the
C        XGETUA routine.  See XSETUA and XGETUA for details.
C
C     Written by Ron Jones, with SLATEC Common Math Library Subcommittee
C
C***REFERENCES  (NONE)
C***ROUTINES CALLED  (NONE)
C***REVISION HISTORY  (YYMMDD)
C   790801  DATE WRITTEN
C   861211  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C***END PROLOGUE  FDUMP
C***FIRST EXECUTABLE STATEMENT  FDUMP
      RETURN
      END

c*************************************************************************
*DECK I1MACH
      INTEGER FUNCTION I1MACH (I)
C***BEGIN PROLOGUE  I1MACH
C***PURPOSE  Return integer machine dependent constants.
C***LIBRARY   SLATEC
C***CATEGORY  R1
C***TYPE      INTEGER (I1MACH-I)
C***KEYWORDS  MACHINE CONSTANTS
C***AUTHOR  Fox, P. A., (Bell Labs)
C           Hall, A. D., (Bell Labs)
C           Schryer, N. L., (Bell Labs)
C***DESCRIPTION
C
C   I1MACH can be used to obtain machine-dependent parameters for the
C   local machine environment.  It is a function subprogram with one
C   (input) argument and can be referenced as follows:
C
C        K = I1MACH(I)
C
C   where I=1,...,16.  The (output) value of K above is determined by
C   the (input) value of I.  The results for various values of I are
C   discussed below.
C
C   I/O unit numbers:
C     I1MACH( 1) = the standard input unit.
C     I1MACH( 2) = the standard output unit.
C     I1MACH( 3) = the standard punch unit.
C     I1MACH( 4) = the standard error message unit.
C
C   Words:
C     I1MACH( 5) = the number of bits per integer storage unit.
C     I1MACH( 6) = the number of characters per integer storage unit.
C
C   Integers:
C     assume integers are represented in the S-digit, base-A form
C
C                sign ( X(S-1)*A**(S-1) + ... + X(1)*A + X(0) )
C
C                where 0 .LE. X(I) .LT. A for I=0,...,S-1.
C     I1MACH( 7) = A, the base.
C     I1MACH( 8) = S, the number of base-A digits.
C     I1MACH( 9) = A**S - 1, the largest magnitude.
C
C   Floating-Point Numbers:
C     Assume floating-point numbers are represented in the T-digit,
C     base-B form
C                sign (B**E)*( (X(1)/B) + ... + (X(T)/B**T) )
C
C                where 0 .LE. X(I) .LT. B for I=1,...,T,
C                0 .LT. X(1), and EMIN .LE. E .LE. EMAX.
C     I1MACH(10) = B, the base.
C
C   Single-Precision:
C     I1MACH(11) = T, the number of base-B digits.
C     I1MACH(12) = EMIN, the smallest exponent E.
C     I1MACH(13) = EMAX, the largest exponent E.
C
C   Double-Precision:
C     I1MACH(14) = T, the number of base-B digits.
C     I1MACH(15) = EMIN, the smallest exponent E.
C     I1MACH(16) = EMAX, the largest exponent E.
C
C   To alter this function for a particular environment, the desired
C   set of DATA statements should be activated by removing the C from
C   column 1.  Also, the values of I1MACH(1) - I1MACH(4) should be
C   checked for consistency with the local operating system.
C
C***REFERENCES  P. A. Fox, A. D. Hall and N. L. Schryer, Framework for
C                 a portable library, ACM Transactions on Mathematical
C                 Software 4, 2 (June 1978), pp. 177-188.
C***ROUTINES CALLED  (NONE)
C***REVISION HISTORY  (YYMMDD)
C   750101  DATE WRITTEN
C   891012  Added VAX G-floating constants.  (WRB)
C   891012  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900618  Added DEC RISC constants.  (WRB)
C   900723  Added IBM RS 6000 constants.  (WRB)
C   901009  Correct I1MACH(7) for IBM Mainframes. Should be 2 not 16.
C           (RWC)
C   910710  Added HP 730 constants.  (SMR)
C   911114  Added Convex IEEE constants.  (WRB)
C   920121  Added SUN -r8 compiler option constants.  (WRB)
C   920229  Added Touchstone Delta i860 constants.  (WRB)
C   920501  Reformatted the REFERENCES section.  (WRB)
C   920625  Added Convex -p8 and -pd8 compiler option constants.
C           (BKS, WRB)
C   930201  Added DEC Alpha and SGI constants.  (RWC and WRB)
C   930618  Corrected I1MACH(5) for Convex -p8 and -pd8 compiler
C           options.  (DWL, RWC and WRB).
C***END PROLOGUE  I1MACH
C
      INTEGER IMACH(16),OUTPUT
      SAVE IMACH
      EQUIVALENCE (IMACH(4),OUTPUT)
C
C     MACHINE CONSTANTS FOR THE AMIGA
C     ABSOFT COMPILER
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -126 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1022 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE APOLLO
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        129 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1025 /
C
C     MACHINE CONSTANTS FOR THE BURROUGHS 1700 SYSTEM
C
C     DATA IMACH( 1) /          7 /
C     DATA IMACH( 2) /          2 /
C     DATA IMACH( 3) /          2 /
C     DATA IMACH( 4) /          2 /
C     DATA IMACH( 5) /         36 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         33 /
C     DATA IMACH( 9) / Z1FFFFFFFF /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -256 /
C     DATA IMACH(13) /        255 /
C     DATA IMACH(14) /         60 /
C     DATA IMACH(15) /       -256 /
C     DATA IMACH(16) /        255 /
C
C     MACHINE CONSTANTS FOR THE BURROUGHS 5700 SYSTEM
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         48 /
C     DATA IMACH( 6) /          6 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         39 /
C     DATA IMACH( 9) / O0007777777777777 /
C     DATA IMACH(10) /          8 /
C     DATA IMACH(11) /         13 /
C     DATA IMACH(12) /        -50 /
C     DATA IMACH(13) /         76 /
C     DATA IMACH(14) /         26 /
C     DATA IMACH(15) /        -50 /
C     DATA IMACH(16) /         76 /
C
C     MACHINE CONSTANTS FOR THE BURROUGHS 6700/7700 SYSTEMS
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         48 /
C     DATA IMACH( 6) /          6 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         39 /
C     DATA IMACH( 9) / O0007777777777777 /
C     DATA IMACH(10) /          8 /
C     DATA IMACH(11) /         13 /
C     DATA IMACH(12) /        -50 /
C     DATA IMACH(13) /         76 /
C     DATA IMACH(14) /         26 /
C     DATA IMACH(15) /     -32754 /
C     DATA IMACH(16) /      32780 /
C
C     MACHINE CONSTANTS FOR THE CDC 170/180 SERIES USING NOS/VE
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         64 /
C     DATA IMACH( 6) /          8 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         63 /
C     DATA IMACH( 9) / 9223372036854775807 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         47 /
C     DATA IMACH(12) /      -4095 /
C     DATA IMACH(13) /       4094 /
C     DATA IMACH(14) /         94 /
C     DATA IMACH(15) /      -4095 /
C     DATA IMACH(16) /       4094 /
C
C     MACHINE CONSTANTS FOR THE CDC 6000/7000 SERIES
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /    6LOUTPUT/
C     DATA IMACH( 5) /         60 /
C     DATA IMACH( 6) /         10 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         48 /
C     DATA IMACH( 9) / 00007777777777777777B /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         47 /
C     DATA IMACH(12) /       -929 /
C     DATA IMACH(13) /       1070 /
C     DATA IMACH(14) /         94 /
C     DATA IMACH(15) /       -929 /
C     DATA IMACH(16) /       1069 /
C
C     MACHINE CONSTANTS FOR THE CELERITY C1260
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          0 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / Z'7FFFFFFF' /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -126 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1022 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE CONVEX
C     USING THE -fn COMPILER OPTION
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1023 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE CONVEX
C     USING THE -fi COMPILER OPTION
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE CONVEX
C     USING THE -p8 COMPILER OPTION
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         64 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         63 /
C     DATA IMACH( 9) / 9223372036854775807 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         53 /
C     DATA IMACH(12) /      -1023 /
C     DATA IMACH(13) /       1023 /
C     DATA IMACH(14) /        113 /
C     DATA IMACH(15) /     -16383 /
C     DATA IMACH(16) /      16383 /
C
C     MACHINE CONSTANTS FOR THE CONVEX
C     USING THE -pd8 COMPILER OPTION
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         64 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         63 /
C     DATA IMACH( 9) / 9223372036854775807 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         53 /
C     DATA IMACH(12) /      -1023 /
C     DATA IMACH(13) /       1023 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1023 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE CRAY
C     USING THE 46 BIT INTEGER COMPILER OPTION
C
C     DATA IMACH( 1) /        100 /
C     DATA IMACH( 2) /        101 /
C     DATA IMACH( 3) /        102 /
C     DATA IMACH( 4) /        101 /
C     DATA IMACH( 5) /         64 /
C     DATA IMACH( 6) /          8 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         46 /
C     DATA IMACH( 9) / 1777777777777777B /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         47 /
C     DATA IMACH(12) /      -8189 /
C     DATA IMACH(13) /       8190 /
C     DATA IMACH(14) /         94 /
C     DATA IMACH(15) /      -8099 /
C     DATA IMACH(16) /       8190 /
C
C     MACHINE CONSTANTS FOR THE CRAY
C     USING THE 64 BIT INTEGER COMPILER OPTION
C
C     DATA IMACH( 1) /        100 /
C     DATA IMACH( 2) /        101 /
C     DATA IMACH( 3) /        102 /
C     DATA IMACH( 4) /        101 /
C     DATA IMACH( 5) /         64 /
C     DATA IMACH( 6) /          8 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         63 /
C     DATA IMACH( 9) / 777777777777777777777B /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         47 /
C     DATA IMACH(12) /      -8189 /
C     DATA IMACH(13) /       8190 /
C     DATA IMACH(14) /         94 /
C     DATA IMACH(15) /      -8099 /
C     DATA IMACH(16) /       8190 /
C
C     MACHINE CONSTANTS FOR THE DATA GENERAL ECLIPSE S/200
C
C     DATA IMACH( 1) /         11 /
C     DATA IMACH( 2) /         12 /
C     DATA IMACH( 3) /          8 /
C     DATA IMACH( 4) /         10 /
C     DATA IMACH( 5) /         16 /
C     DATA IMACH( 6) /          2 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         15 /
C     DATA IMACH( 9) /      32767 /
C     DATA IMACH(10) /         16 /
C     DATA IMACH(11) /          6 /
C     DATA IMACH(12) /        -64 /
C     DATA IMACH(13) /         63 /
C     DATA IMACH(14) /         14 /
C     DATA IMACH(15) /        -64 /
C     DATA IMACH(16) /         63 /
C
C     MACHINE CONSTANTS FOR THE DEC ALPHA
C     USING G_FLOAT
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1023 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE DEC ALPHA
C     USING IEEE_FLOAT
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE DEC RISC
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE DEC VAX
C     USING D_FLOATING
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         56 /
C     DATA IMACH(15) /       -127 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR THE DEC VAX
C     USING G_FLOATING
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1023 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE ELXSI 6400
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         32 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -126 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1022 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE HARRIS 220
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          0 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         24 /
C     DATA IMACH( 6) /          3 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         23 /
C     DATA IMACH( 9) /    8388607 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         23 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         38 /
C     DATA IMACH(15) /       -127 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR THE HONEYWELL 600/6000 SERIES
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /         43 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         36 /
C     DATA IMACH( 6) /          6 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         35 /
C     DATA IMACH( 9) / O377777777777 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         27 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         63 /
C     DATA IMACH(15) /       -127 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR THE HP 730
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE HP 2100
C     3 WORD DOUBLE PRECISION OPTION WITH FTN4
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          4 /
C     DATA IMACH( 4) /          1 /
C     DATA IMACH( 5) /         16 /
C     DATA IMACH( 6) /          2 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         15 /
C     DATA IMACH( 9) /      32767 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         23 /
C     DATA IMACH(12) /       -128 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         39 /
C     DATA IMACH(15) /       -128 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR THE HP 2100
C     4 WORD DOUBLE PRECISION OPTION WITH FTN4
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          4 /
C     DATA IMACH( 4) /          1 /
C     DATA IMACH( 5) /         16 /
C     DATA IMACH( 6) /          2 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         15 /
C     DATA IMACH( 9) /      32767 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         23 /
C     DATA IMACH(12) /       -128 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         55 /
C     DATA IMACH(15) /       -128 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR THE HP 9000
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          7 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         32 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -126 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1015 /
C     DATA IMACH(16) /       1017 /
C
C     MACHINE CONSTANTS FOR THE IBM 360/370 SERIES,
C     THE XEROX SIGMA 5/7/9, THE SEL SYSTEMS 85/86, AND
C     THE PERKIN ELMER (INTERDATA) 7/32.
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          7 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) /  Z7FFFFFFF /
C     DATA IMACH(10) /         16 /
C     DATA IMACH(11) /          6 /
C     DATA IMACH(12) /        -64 /
C     DATA IMACH(13) /         63 /
C     DATA IMACH(14) /         14 /
C     DATA IMACH(15) /        -64 /
C     DATA IMACH(16) /         63 /
C
C     MACHINE CONSTANTS FOR THE IBM PC
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          0 /
C     DATA IMACH( 4) /          0 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE IBM RS 6000
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          0 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE INTEL i860
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE PDP-10 (KA PROCESSOR)
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         36 /
C     DATA IMACH( 6) /          5 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         35 /
C     DATA IMACH( 9) / "377777777777 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         27 /
C     DATA IMACH(12) /       -128 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         54 /
C     DATA IMACH(15) /       -101 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR THE PDP-10 (KI PROCESSOR)
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         36 /
C     DATA IMACH( 6) /          5 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         35 /
C     DATA IMACH( 9) / "377777777777 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         27 /
C     DATA IMACH(12) /       -128 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         62 /
C     DATA IMACH(15) /       -128 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR PDP-11 FORTRAN SUPPORTING
C     32-BIT INTEGER ARITHMETIC.
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         56 /
C     DATA IMACH(15) /       -127 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR PDP-11 FORTRAN SUPPORTING
C     16-BIT INTEGER ARITHMETIC.
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          5 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         16 /
C     DATA IMACH( 6) /          2 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         15 /
C     DATA IMACH( 9) /      32767 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         56 /
C     DATA IMACH(15) /       -127 /
C     DATA IMACH(16) /        127 /
C
C     MACHINE CONSTANTS FOR THE SILICON GRAPHICS
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE SUN
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -125 /
C     DATA IMACH(13) /        128 /
C     DATA IMACH(14) /         53 /
C     DATA IMACH(15) /      -1021 /
C     DATA IMACH(16) /       1024 /
C
C     MACHINE CONSTANTS FOR THE SUN
C     USING THE -r8 COMPILER OPTION
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          6 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         32 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         31 /
C     DATA IMACH( 9) / 2147483647 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         53 /
C     DATA IMACH(12) /      -1021 /
C     DATA IMACH(13) /       1024 /
C     DATA IMACH(14) /        113 /
C     DATA IMACH(15) /     -16381 /
C     DATA IMACH(16) /      16384 /
C
C     MACHINE CONSTANTS FOR THE UNIVAC 1100 SERIES FTN COMPILER
C
C     DATA IMACH( 1) /          5 /
C     DATA IMACH( 2) /          6 /
C     DATA IMACH( 3) /          1 /
C     DATA IMACH( 4) /          6 /
C     DATA IMACH( 5) /         36 /
C     DATA IMACH( 6) /          4 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         35 /
C     DATA IMACH( 9) / O377777777777 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         27 /
C     DATA IMACH(12) /       -128 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         60 /
C     DATA IMACH(15) /      -1024 /
C     DATA IMACH(16) /       1023 /
C
C     MACHINE CONSTANTS FOR THE Z80 MICROPROCESSOR
C
C     DATA IMACH( 1) /          1 /
C     DATA IMACH( 2) /          1 /
C     DATA IMACH( 3) /          0 /
C     DATA IMACH( 4) /          1 /
C     DATA IMACH( 5) /         16 /
C     DATA IMACH( 6) /          2 /
C     DATA IMACH( 7) /          2 /
C     DATA IMACH( 8) /         15 /
C     DATA IMACH( 9) /      32767 /
C     DATA IMACH(10) /          2 /
C     DATA IMACH(11) /         24 /
C     DATA IMACH(12) /       -127 /
C     DATA IMACH(13) /        127 /
C     DATA IMACH(14) /         56 /
C     DATA IMACH(15) /       -127 /
C     DATA IMACH(16) /        127 /
C
C***FIRST EXECUTABLE STATEMENT  I1MACH
      IF (I .LT. 1  .OR.  I .GT. 16) GO TO 10
C
      I1MACH = IMACH(I)
      RETURN
C
   10 CONTINUE
      WRITE (UNIT = OUTPUT, FMT = 9000)
 9000 FORMAT ('1ERROR    1 IN I1MACH - I OUT OF BOUNDS')
C
C     CALL FDUMP
C
      STOP
      END

c*************************************************************************
*DECK J4SAVE
      FUNCTION J4SAVE (IWHICH, IVALUE, ISET)
C***BEGIN PROLOGUE  J4SAVE
C***SUBSIDIARY
C***PURPOSE  Save or recall global variables needed by error
C            handling routines.
C***LIBRARY   SLATEC (XERROR)
C***TYPE      INTEGER (J4SAVE-I)
C***KEYWORDS  ERROR MESSAGES, ERROR NUMBER, RECALL, SAVE, XERROR
C***AUTHOR  Jones, R. E., (SNLA)
C***DESCRIPTION
C
C     Abstract
C        J4SAVE saves and recalls several global variables needed
C        by the library error handling routines.
C
C     Description of Parameters
C      --Input--
C        IWHICH - Index of item desired.
C                = 1 Refers to current error number.
C                = 2 Refers to current error control flag.
C                = 3 Refers to current unit number to which error
C                    messages are to be sent.  (0 means use standard.)
C                = 4 Refers to the maximum number of times any
C                     message is to be printed (as set by XERMAX).
C                = 5 Refers to the total number of units to which
C                     each error message is to be written.
C                = 6 Refers to the 2nd unit for error messages
C                = 7 Refers to the 3rd unit for error messages
C                = 8 Refers to the 4th unit for error messages
C                = 9 Refers to the 5th unit for error messages
C        IVALUE - The value to be set for the IWHICH-th parameter,
C                 if ISET is .TRUE. .
C        ISET   - If ISET=.TRUE., the IWHICH-th parameter will BE
C                 given the value, IVALUE.  If ISET=.FALSE., the
C                 IWHICH-th parameter will be unchanged, and IVALUE
C                 is a dummy parameter.
C      --Output--
C        The (old) value of the IWHICH-th parameter will be returned
C        in the function value, J4SAVE.
C
C***SEE ALSO  XERMSG
C***REFERENCES  R. E. Jones and D. K. Kahaner, XERROR, the SLATEC
C                 Error-handling Package, SAND82-0800, Sandia
C                 Laboratories, 1982.
C***ROUTINES CALLED  (NONE)
C***REVISION HISTORY  (YYMMDD)
C   790801  DATE WRITTEN
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900205  Minor modifications to prologue.  (WRB)
C   900402  Added TYPE section.  (WRB)
C   910411  Added KEYWORDS section.  (WRB)
C   920501  Reformatted the REFERENCES section.  (WRB)
C***END PROLOGUE  J4SAVE
      LOGICAL ISET
      INTEGER IPARAM(9)
      SAVE IPARAM
      DATA IPARAM(1),IPARAM(2),IPARAM(3),IPARAM(4)/0,2,0,10/
      DATA IPARAM(5)/1/
      DATA IPARAM(6),IPARAM(7),IPARAM(8),IPARAM(9)/0,0,0,0/
C***FIRST EXECUTABLE STATEMENT  J4SAVE
      J4SAVE = IPARAM(IWHICH)
      IF (ISET) IPARAM(IWHICH) = IVALUE
      RETURN
      END

c*************************************************************************
*DECK XERCNT
      SUBROUTINE XERCNT (LIBRAR, SUBROU, MESSG, NERR, LEVEL, KONTRL)
C***BEGIN PROLOGUE  XERCNT
C***SUBSIDIARY
C***PURPOSE  Allow user control over handling of errors.
C***LIBRARY   SLATEC (XERROR)
C***CATEGORY  R3C
C***TYPE      ALL (XERCNT-A)
C***KEYWORDS  ERROR, XERROR
C***AUTHOR  Jones, R. E., (SNLA)
C***DESCRIPTION
C
C     Abstract
C        Allows user control over handling of individual errors.
C        Just after each message is recorded, but before it is
C        processed any further (i.e., before it is printed or
C        a decision to abort is made), a call is made to XERCNT.
C        If the user has provided his own version of XERCNT, he
C        can then override the value of KONTROL used in processing
C        this message by redefining its value.
C        KONTRL may be set to any value from -2 to 2.
C        The meanings for KONTRL are the same as in XSETF, except
C        that the value of KONTRL changes only for this message.
C        If KONTRL is set to a value outside the range from -2 to 2,
C        it will be moved back into that range.
C
C     Description of Parameters
C
C      --Input--
C        LIBRAR - the library that the routine is in.
C        SUBROU - the subroutine that XERMSG is being called from
C        MESSG  - the first 20 characters of the error message.
C        NERR   - same as in the call to XERMSG.
C        LEVEL  - same as in the call to XERMSG.
C        KONTRL - the current value of the control flag as set
C                 by a call to XSETF.
C
C      --Output--
C        KONTRL - the new value of KONTRL.  If KONTRL is not
C                 defined, it will remain at its original value.
C                 This changed value of control affects only
C                 the current occurrence of the current message.
C
C***REFERENCES  R. E. Jones and D. K. Kahaner, XERROR, the SLATEC
C                 Error-handling Package, SAND82-0800, Sandia
C                 Laboratories, 1982.
C***ROUTINES CALLED  (NONE)
C***REVISION HISTORY  (YYMMDD)
C   790801  DATE WRITTEN
C   861211  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900206  Routine changed from user-callable to subsidiary.  (WRB)
C   900510  Changed calling sequence to include LIBRARY and SUBROUTINE
C           names, changed routine name from XERCTL to XERCNT.  (RWC)
C   920501  Reformatted the REFERENCES section.  (WRB)
C***END PROLOGUE  XERCNT
      CHARACTER*(*) LIBRAR, SUBROU, MESSG
C***FIRST EXECUTABLE STATEMENT  XERCNT
      RETURN
      END

c*************************************************************************
*DECK XERHLT
      SUBROUTINE XERHLT (MESSG)
C***BEGIN PROLOGUE  XERHLT
C***SUBSIDIARY
C***PURPOSE  Abort program execution and print error message.
C***LIBRARY   SLATEC (XERROR)
C***CATEGORY  R3C
C***TYPE      ALL (XERHLT-A)
C***KEYWORDS  ABORT PROGRAM EXECUTION, ERROR, XERROR
C***AUTHOR  Jones, R. E., (SNLA)
C***DESCRIPTION
C
C     Abstract
C        ***Note*** machine dependent routine
C        XERHLT aborts the execution of the program.
C        The error message causing the abort is given in the calling
C        sequence, in case one needs it for printing on a dayfile,
C        for example.
C
C     Description of Parameters
C        MESSG is as in XERMSG.
C
C***REFERENCES  R. E. Jones and D. K. Kahaner, XERROR, the SLATEC
C                 Error-handling Package, SAND82-0800, Sandia
C                 Laboratories, 1982.
C***ROUTINES CALLED  (NONE)
C***REVISION HISTORY  (YYMMDD)
C   790801  DATE WRITTEN
C   861211  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900206  Routine changed from user-callable to subsidiary.  (WRB)
C   900510  Changed calling sequence to delete length of character
C           and changed routine name from XERABT to XERHLT.  (RWC)
C   920501  Reformatted the REFERENCES section.  (WRB)
C***END PROLOGUE  XERHLT
      CHARACTER*(*) MESSG
C***FIRST EXECUTABLE STATEMENT  XERHLT
      STOP
      END

c*************************************************************************
*DECK XERMSG
      SUBROUTINE XERMSG (LIBRAR, SUBROU, MESSG, NERR, LEVEL)
C***BEGIN PROLOGUE  XERMSG
C***PURPOSE  Process error messages for SLATEC and other libraries.
C***LIBRARY   SLATEC (XERROR)
C***CATEGORY  R3C
C***TYPE      ALL (XERMSG-A)
C***KEYWORDS  ERROR MESSAGE, XERROR
C***AUTHOR  Fong, Kirby, (NMFECC at LLNL)
C***DESCRIPTION
C
C   XERMSG processes a diagnostic message in a manner determined by the
C   value of LEVEL and the current value of the library error control
C   flag, KONTRL.  See subroutine XSETF for details.
C
C    LIBRAR   A character constant (or character variable) with the name
C             of the library.  This will be 'SLATEC' for the SLATEC
C             Common Math Library.  The error handling package is
C             general enough to be used by many libraries
C             simultaneously, so it is desirable for the routine that
C             detects and reports an error to identify the library name
C             as well as the routine name.
C
C    SUBROU   A character constant (or character variable) with the name
C             of the routine that detected the error.  Usually it is the
C             name of the routine that is calling XERMSG.  There are
C             some instances where a user callable library routine calls
C             lower level subsidiary routines where the error is
C             detected.  In such cases it may be more informative to
C             supply the name of the routine the user called rather than
C             the name of the subsidiary routine that detected the
C             error.
C
C    MESSG    A character constant (or character variable) with the text
C             of the error or warning message.  In the example below,
C             the message is a character constant that contains a
C             generic message.
C
C                   CALL XERMSG ('SLATEC', 'MMPY',
C                  *'THE ORDER OF THE MATRIX EXCEEDS THE ROW DIMENSION',
C                  *3, 1)
C
C             It is possible (and is sometimes desirable) to generate a
C             specific message--e.g., one that contains actual numeric
C             values.  Specific numeric values can be converted into
C             character strings using formatted WRITE statements into
C             character variables.  This is called standard Fortran
C             internal file I/O and is exemplified in the first three
C             lines of the following example.  You can also catenate
C             substrings of characters to construct the error message.
C             Here is an example showing the use of both writing to
C             an internal file and catenating character strings.
C
C                   CHARACTER*5 CHARN, CHARL
C                   WRITE (CHARN,10) N
C                   WRITE (CHARL,10) LDA
C                10 FORMAT(I5)
C                   CALL XERMSG ('SLATEC', 'MMPY', 'THE ORDER'//CHARN//
C                  *   ' OF THE MATRIX EXCEEDS ITS ROW DIMENSION OF'//
C                  *   CHARL, 3, 1)
C
C             There are two subtleties worth mentioning.  One is that
C             the // for character catenation is used to construct the
C             error message so that no single character constant is
C             continued to the next line.  This avoids confusion as to
C             whether there are trailing blanks at the end of the line.
C             The second is that by catenating the parts of the message
C             as an actual argument rather than encoding the entire
C             message into one large character variable, we avoid
C             having to know how long the message will be in order to
C             declare an adequate length for that large character
C             variable.  XERMSG calls XERPRN to print the message using
C             multiple lines if necessary.  If the message is very long,
C             XERPRN will break it into pieces of 72 characters (as
C             requested by XERMSG) for printing on multiple lines.
C             Also, XERMSG asks XERPRN to prefix each line with ' *  '
C             so that the total line length could be 76 characters.
C             Note also that XERPRN scans the error message backwards
C             to ignore trailing blanks.  Another feature is that
C             the substring '$$' is treated as a new line sentinel
C             by XERPRN.  If you want to construct a multiline
C             message without having to count out multiples of 72
C             characters, just use '$$' as a separator.  '$$'
C             obviously must occur within 72 characters of the
C             start of each line to have its intended effect since
C             XERPRN is asked to wrap around at 72 characters in
C             addition to looking for '$$'.
C
C    NERR     An integer value that is chosen by the library routine's
C             author.  It must be in the range -99 to 999 (three
C             printable digits).  Each distinct error should have its
C             own error number.  These error numbers should be described
C             in the machine readable documentation for the routine.
C             The error numbers need be unique only within each routine,
C             so it is reasonable for each routine to start enumerating
C             errors from 1 and proceeding to the next integer.
C
C    LEVEL    An integer value in the range 0 to 2 that indicates the
C             level (severity) of the error.  Their meanings are
C
C            -1  A warning message.  This is used if it is not clear
C                that there really is an error, but the user's attention
C                may be needed.  An attempt is made to only print this
C                message once.
C
C             0  A warning message.  This is used if it is not clear
C                that there really is an error, but the user's attention
C                may be needed.
C
C             1  A recoverable error.  This is used even if the error is
C                so serious that the routine cannot return any useful
C                answer.  If the user has told the error package to
C                return after recoverable errors, then XERMSG will
C                return to the Library routine which can then return to
C                the user's routine.  The user may also permit the error
C                package to terminate the program upon encountering a
C                recoverable error.
C
C             2  A fatal error.  XERMSG will not return to its caller
C                after it receives a fatal error.  This level should
C                hardly ever be used; it is much better to allow the
C                user a chance to recover.  An example of one of the few
C                cases in which it is permissible to declare a level 2
C                error is a reverse communication Library routine that
C                is likely to be called repeatedly until it integrates
C                across some interval.  If there is a serious error in
C                the input such that another step cannot be taken and
C                the Library routine is called again without the input
C                error having been corrected by the caller, the Library
C                routine will probably be called forever with improper
C                input.  In this case, it is reasonable to declare the
C                error to be fatal.
C
C    Each of the arguments to XERMSG is input; none will be modified by
C    XERMSG.  A routine may make multiple calls to XERMSG with warning
C    level messages; however, after a call to XERMSG with a recoverable
C    error, the routine should return to the user.  Do not try to call
C    XERMSG with a second recoverable error after the first recoverable
C    error because the error package saves the error number.  The user
C    can retrieve this error number by calling another entry point in
C    the error handling package and then clear the error number when
C    recovering from the error.  Calling XERMSG in succession causes the
C    old error number to be overwritten by the latest error number.
C    This is considered harmless for error numbers associated with
C    warning messages but must not be done for error numbers of serious
C    errors.  After a call to XERMSG with a recoverable error, the user
C    must be given a chance to call NUMXER or XERCLR to retrieve or
C    clear the error number.
C***REFERENCES  R. E. Jones and D. K. Kahaner, XERROR, the SLATEC
C                 Error-handling Package, SAND82-0800, Sandia
C                 Laboratories, 1982.
C***ROUTINES CALLED  FDUMP, J4SAVE, XERCNT, XERHLT, XERPRN, XERSVE
C***REVISION HISTORY  (YYMMDD)
C   880101  DATE WRITTEN
C   880621  REVISED AS DIRECTED AT SLATEC CML MEETING OF FEBRUARY 1988.
C           THERE ARE TWO BASIC CHANGES.
C           1.  A NEW ROUTINE, XERPRN, IS USED INSTEAD OF XERPRT TO
C               PRINT MESSAGES.  THIS ROUTINE WILL BREAK LONG MESSAGES
C               INTO PIECES FOR PRINTING ON MULTIPLE LINES.  '$$' IS
C               ACCEPTED AS A NEW LINE SENTINEL.  A PREFIX CAN BE
C               ADDED TO EACH LINE TO BE PRINTED.  XERMSG USES EITHER
C               ' ***' OR ' *  ' AND LONG MESSAGES ARE BROKEN EVERY
C               72 CHARACTERS (AT MOST) SO THAT THE MAXIMUM LINE
C               LENGTH OUTPUT CAN NOW BE AS GREAT AS 76.
C           2.  THE TEXT OF ALL MESSAGES IS NOW IN UPPER CASE SINCE THE
C               FORTRAN STANDARD DOCUMENT DOES NOT ADMIT THE EXISTENCE
C               OF LOWER CASE.
C   880708  REVISED AFTER THE SLATEC CML MEETING OF JUNE 29 AND 30.
C           THE PRINCIPAL CHANGES ARE
C           1.  CLARIFY COMMENTS IN THE PROLOGUES
C           2.  RENAME XRPRNT TO XERPRN
C           3.  REWORK HANDLING OF '$$' IN XERPRN TO HANDLE BLANK LINES
C               SIMILAR TO THE WAY FORMAT STATEMENTS HANDLE THE /
C               CHARACTER FOR NEW RECORDS.
C   890706  REVISED WITH THE HELP OF FRED FRITSCH AND REG CLEMENS TO
C           CLEAN UP THE CODING.
C   890721  REVISED TO USE NEW FEATURE IN XERPRN TO COUNT CHARACTERS IN
C           PREFIX.
C   891013  REVISED TO CORRECT COMMENTS.
C   891214  Prologue converted to Version 4.0 format.  (WRB)
C   900510  Changed test on NERR to be -9999999 < NERR < 99999999, but
C           NERR .ne. 0, and on LEVEL to be -2 < LEVEL < 3.  Added
C           LEVEL=-1 logic, changed calls to XERSAV to XERSVE, and
C           XERCTL to XERCNT.  (RWC)
C   920501  Reformatted the REFERENCES section.  (WRB)
C***END PROLOGUE  XERMSG
      CHARACTER*(*) LIBRAR, SUBROU, MESSG
      CHARACTER*8 XLIBR, XSUBR
      CHARACTER*72  TEMP
      CHARACTER*20  LFIRST
C***FIRST EXECUTABLE STATEMENT  XERMSG
      LKNTRL = J4SAVE (2, 0, .FALSE.)
      MAXMES = J4SAVE (4, 0, .FALSE.)
C
C       LKNTRL IS A LOCAL COPY OF THE CONTROL FLAG KONTRL.
C       MAXMES IS THE MAXIMUM NUMBER OF TIMES ANY PARTICULAR MESSAGE
C          SHOULD BE PRINTED.
C
C       WE PRINT A FATAL ERROR MESSAGE AND TERMINATE FOR AN ERROR IN
C          CALLING XERMSG.  THE ERROR NUMBER SHOULD BE POSITIVE,
C          AND THE LEVEL SHOULD BE BETWEEN 0 AND 2.
C
      IF (NERR.LT.-9999999 .OR. NERR.GT.99999999 .OR. NERR.EQ.0 .OR.
     *   LEVEL.LT.-1 .OR. LEVEL.GT.2) THEN
         CALL XERPRN (' ***', -1, 'FATAL ERROR IN...$$ ' //
     *      'XERMSG -- INVALID ERROR NUMBER OR LEVEL$$ '//
     *      'JOB ABORT DUE TO FATAL ERROR.', 72)
         CALL XERSVE (' ', ' ', ' ', 0, 0, 0, KDUMMY)
         CALL XERHLT (' ***XERMSG -- INVALID INPUT')
         RETURN
      ENDIF
C
C       RECORD THE MESSAGE.
C
      I = J4SAVE (1, NERR, .TRUE.)
      CALL XERSVE (LIBRAR, SUBROU, MESSG, 1, NERR, LEVEL, KOUNT)
C
C       HANDLE PRINT-ONCE WARNING MESSAGES.
C
      IF (LEVEL.EQ.-1 .AND. KOUNT.GT.1) RETURN
C
C       ALLOW TEMPORARY USER OVERRIDE OF THE CONTROL FLAG.
C
      XLIBR  = LIBRAR
      XSUBR  = SUBROU
      LFIRST = MESSG
      LERR   = NERR
      LLEVEL = LEVEL
      CALL XERCNT (XLIBR, XSUBR, LFIRST, LERR, LLEVEL, LKNTRL)
C
      LKNTRL = MAX(-2, MIN(2,LKNTRL))
      MKNTRL = ABS(LKNTRL)
C
C       SKIP PRINTING IF THE CONTROL FLAG VALUE AS RESET IN XERCNT IS
C       ZERO AND THE ERROR IS NOT FATAL.
C
      IF (LEVEL.LT.2 .AND. LKNTRL.EQ.0) GO TO 30
      IF (LEVEL.EQ.0 .AND. KOUNT.GT.MAXMES) GO TO 30
      IF (LEVEL.EQ.1 .AND. KOUNT.GT.MAXMES .AND. MKNTRL.EQ.1) GO TO 30
      IF (LEVEL.EQ.2 .AND. KOUNT.GT.MAX(1,MAXMES)) GO TO 30
C
C       ANNOUNCE THE NAMES OF THE LIBRARY AND SUBROUTINE BY BUILDING A
C       MESSAGE IN CHARACTER VARIABLE TEMP (NOT EXCEEDING 66 CHARACTERS)
C       AND SENDING IT OUT VIA XERPRN.  PRINT ONLY IF CONTROL FLAG
C       IS NOT ZERO.
C
      IF (LKNTRL .NE. 0) THEN
         TEMP(1:21) = 'MESSAGE FROM ROUTINE '
         I = MIN(LEN(SUBROU), 16)
         TEMP(22:21+I) = SUBROU(1:I)
         TEMP(22+I:33+I) = ' IN LIBRARY '
         LTEMP = 33 + I
         I = MIN(LEN(LIBRAR), 16)
         TEMP(LTEMP+1:LTEMP+I) = LIBRAR (1:I)
         TEMP(LTEMP+I+1:LTEMP+I+1) = '.'
         LTEMP = LTEMP + I + 1
         CALL XERPRN (' ***', -1, TEMP(1:LTEMP), 72)
      ENDIF
C
C       IF LKNTRL IS POSITIVE, PRINT AN INTRODUCTORY LINE BEFORE
C       PRINTING THE MESSAGE.  THE INTRODUCTORY LINE TELLS THE CHOICE
C       FROM EACH OF THE FOLLOWING THREE OPTIONS.
C       1.  LEVEL OF THE MESSAGE
C              'INFORMATIVE MESSAGE'
C              'POTENTIALLY RECOVERABLE ERROR'
C              'FATAL ERROR'
C       2.  WHETHER CONTROL FLAG WILL ALLOW PROGRAM TO CONTINUE
C              'PROG CONTINUES'
C              'PROG ABORTED'
C       3.  WHETHER OR NOT A TRACEBACK WAS REQUESTED.  (THE TRACEBACK
C           MAY NOT BE IMPLEMENTED AT SOME SITES, SO THIS ONLY TELLS
C           WHAT WAS REQUESTED, NOT WHAT WAS DELIVERED.)
C              'TRACEBACK REQUESTED'
C              'TRACEBACK NOT REQUESTED'
C       NOTICE THAT THE LINE INCLUDING FOUR PREFIX CHARACTERS WILL NOT
C       EXCEED 74 CHARACTERS.
C       WE SKIP THE NEXT BLOCK IF THE INTRODUCTORY LINE IS NOT NEEDED.
C
      IF (LKNTRL .GT. 0) THEN
C
C       THE FIRST PART OF THE MESSAGE TELLS ABOUT THE LEVEL.
C
         IF (LEVEL .LE. 0) THEN
            TEMP(1:20) = 'INFORMATIVE MESSAGE,'
            LTEMP = 20
         ELSEIF (LEVEL .EQ. 1) THEN
            TEMP(1:30) = 'POTENTIALLY RECOVERABLE ERROR,'
            LTEMP = 30
         ELSE
            TEMP(1:12) = 'FATAL ERROR,'
            LTEMP = 12
         ENDIF
C
C       THEN WHETHER THE PROGRAM WILL CONTINUE.
C
         IF ((MKNTRL.EQ.2 .AND. LEVEL.GE.1) .OR.
     *       (MKNTRL.EQ.1 .AND. LEVEL.EQ.2)) THEN
            TEMP(LTEMP+1:LTEMP+14) = ' PROG ABORTED,'
            LTEMP = LTEMP + 14
         ELSE
            TEMP(LTEMP+1:LTEMP+16) = ' PROG CONTINUES,'
            LTEMP = LTEMP + 16
         ENDIF
C
C       FINALLY TELL WHETHER THERE SHOULD BE A TRACEBACK.
C
         IF (LKNTRL .GT. 0) THEN
            TEMP(LTEMP+1:LTEMP+20) = ' TRACEBACK REQUESTED'
            LTEMP = LTEMP + 20
         ELSE
            TEMP(LTEMP+1:LTEMP+24) = ' TRACEBACK NOT REQUESTED'
            LTEMP = LTEMP + 24
         ENDIF
         CALL XERPRN (' ***', -1, TEMP(1:LTEMP), 72)
      ENDIF
C
C       NOW SEND OUT THE MESSAGE.
C
      CALL XERPRN (' *  ', -1, MESSG, 72)
C
C       IF LKNTRL IS POSITIVE, WRITE THE ERROR NUMBER AND REQUEST A
C          TRACEBACK.
C
      IF (LKNTRL .GT. 0) THEN
         WRITE (TEMP, '(''ERROR NUMBER = '', I8)') NERR
         DO 10 I=16,22
            IF (TEMP(I:I) .NE. ' ') GO TO 20
   10    CONTINUE
C
   20    CALL XERPRN (' *  ', -1, TEMP(1:15) // TEMP(I:23), 72)
         CALL FDUMP
      ENDIF
C
C       IF LKNTRL IS NOT ZERO, PRINT A BLANK LINE AND AN END OF MESSAGE.
C
      IF (LKNTRL .NE. 0) THEN
         CALL XERPRN (' *  ', -1, ' ', 72)
         CALL XERPRN (' ***', -1, 'END OF MESSAGE', 72)
         CALL XERPRN ('    ',  0, ' ', 72)
      ENDIF
C
C       IF THE ERROR IS NOT FATAL OR THE ERROR IS RECOVERABLE AND THE
C       CONTROL FLAG IS SET FOR RECOVERY, THEN RETURN.
C
   30 IF (LEVEL.LE.0 .OR. (LEVEL.EQ.1 .AND. MKNTRL.LE.1)) RETURN
C
C       THE PROGRAM WILL BE STOPPED DUE TO AN UNRECOVERED ERROR OR A
C       FATAL ERROR.  PRINT THE REASON FOR THE ABORT AND THE ERROR
C       SUMMARY IF THE CONTROL FLAG AND THE MAXIMUM ERROR COUNT PERMIT.
C
      IF (LKNTRL.GT.0 .AND. KOUNT.LT.MAX(1,MAXMES)) THEN
         IF (LEVEL .EQ. 1) THEN
            CALL XERPRN
     *         (' ***', -1, 'JOB ABORT DUE TO UNRECOVERED ERROR.', 72)
         ELSE
            CALL XERPRN(' ***', -1, 'JOB ABORT DUE TO FATAL ERROR.', 72)
         ENDIF
         CALL XERSVE (' ', ' ', ' ', -1, 0, 0, KDUMMY)
         CALL XERHLT (' ')
      ELSE
         CALL XERHLT (MESSG)
      ENDIF
      RETURN
      END

c*************************************************************************
*DECK XERPRN
      SUBROUTINE XERPRN (PREFIX, NPREF, MESSG, NWRAP)
C***BEGIN PROLOGUE  XERPRN
C***SUBSIDIARY
C***PURPOSE  Print error messages processed by XERMSG.
C***LIBRARY   SLATEC (XERROR)
C***CATEGORY  R3C
C***TYPE      ALL (XERPRN-A)
C***KEYWORDS  ERROR MESSAGES, PRINTING, XERROR
C***AUTHOR  Fong, Kirby, (NMFECC at LLNL)
C***DESCRIPTION
C
C This routine sends one or more lines to each of the (up to five)
C logical units to which error messages are to be sent.  This routine
C is called several times by XERMSG, sometimes with a single line to
C print and sometimes with a (potentially very long) message that may
C wrap around into multiple lines.
C
C PREFIX  Input argument of type CHARACTER.  This argument contains
C         characters to be put at the beginning of each line before
C         the body of the message.  No more than 16 characters of
C         PREFIX will be used.
C
C NPREF   Input argument of type INTEGER.  This argument is the number
C         of characters to use from PREFIX.  If it is negative, the
C         intrinsic function LEN is used to determine its length.  If
C         it is zero, PREFIX is not used.  If it exceeds 16 or if
C         LEN(PREFIX) exceeds 16, only the first 16 characters will be
C         used.  If NPREF is positive and the length of PREFIX is less
C         than NPREF, a copy of PREFIX extended with blanks to length
C         NPREF will be used.
C
C MESSG   Input argument of type CHARACTER.  This is the text of a
C         message to be printed.  If it is a long message, it will be
C         broken into pieces for printing on multiple lines.  Each line
C         will start with the appropriate prefix and be followed by a
C         piece of the message.  NWRAP is the number of characters per
C         piece; that is, after each NWRAP characters, we break and
C         start a new line.  In addition the characters '$$' embedded
C         in MESSG are a sentinel for a new line.  The counting of
C         characters up to NWRAP starts over for each new line.  The
C         value of NWRAP typically used by XERMSG is 72 since many
C         older error messages in the SLATEC Library are laid out to
C         rely on wrap-around every 72 characters.
C
C NWRAP   Input argument of type INTEGER.  This gives the maximum size
C         piece into which to break MESSG for printing on multiple
C         lines.  An embedded '$$' ends a line, and the count restarts
C         at the following character.  If a line break does not occur
C         on a blank (it would split a word) that word is moved to the
C         next line.  Values of NWRAP less than 16 will be treated as
C         16.  Values of NWRAP greater than 132 will be treated as 132.
C         The actual line length will be NPREF + NWRAP after NPREF has
C         been adjusted to fall between 0 and 16 and NWRAP has been
C         adjusted to fall between 16 and 132.
C
C***REFERENCES  R. E. Jones and D. K. Kahaner, XERROR, the SLATEC
C                 Error-handling Package, SAND82-0800, Sandia
C                 Laboratories, 1982.
C***ROUTINES CALLED  I1MACH, XGETUA
C***REVISION HISTORY  (YYMMDD)
C   880621  DATE WRITTEN
C   880708  REVISED AFTER THE SLATEC CML SUBCOMMITTEE MEETING OF
C           JUNE 29 AND 30 TO CHANGE THE NAME TO XERPRN AND TO REWORK
C           THE HANDLING OF THE NEW LINE SENTINEL TO BEHAVE LIKE THE
C           SLASH CHARACTER IN FORMAT STATEMENTS.
C   890706  REVISED WITH THE HELP OF FRED FRITSCH AND REG CLEMENS TO
C           STREAMLINE THE CODING AND FIX A BUG THAT CAUSED EXTRA BLANK
C           LINES TO BE PRINTED.
C   890721  REVISED TO ADD A NEW FEATURE.  A NEGATIVE VALUE OF NPREF
C           CAUSES LEN(PREFIX) TO BE USED AS THE LENGTH.
C   891013  REVISED TO CORRECT ERROR IN CALCULATING PREFIX LENGTH.
C   891214  Prologue converted to Version 4.0 format.  (WRB)
C   900510  Added code to break messages between words.  (RWC)
C   920501  Reformatted the REFERENCES section.  (WRB)
C***END PROLOGUE  XERPRN
      CHARACTER*(*) PREFIX, MESSG
      INTEGER NPREF, NWRAP
      CHARACTER*148 CBUFF
      INTEGER IU(5), NUNIT
      CHARACTER*2 NEWLIN
      PARAMETER (NEWLIN = '$$')
C***FIRST EXECUTABLE STATEMENT  XERPRN
      CALL XGETUA(IU,NUNIT)
C
C       A ZERO VALUE FOR A LOGICAL UNIT NUMBER MEANS TO USE THE STANDARD
C       ERROR MESSAGE UNIT INSTEAD.  I1MACH(4) RETRIEVES THE STANDARD
C       ERROR MESSAGE UNIT.
C
      N = I1MACH(4)
      DO 10 I=1,NUNIT
         IF (IU(I) .EQ. 0) IU(I) = N
   10 CONTINUE
C
C       LPREF IS THE LENGTH OF THE PREFIX.  THE PREFIX IS PLACED AT THE
C       BEGINNING OF CBUFF, THE CHARACTER BUFFER, AND KEPT THERE DURING
C       THE REST OF THIS ROUTINE.
C
      IF ( NPREF .LT. 0 ) THEN
         LPREF = LEN(PREFIX)
      ELSE
         LPREF = NPREF
      ENDIF
      LPREF = MIN(16, LPREF)
      IF (LPREF .NE. 0) CBUFF(1:LPREF) = PREFIX
C
C       LWRAP IS THE MAXIMUM NUMBER OF CHARACTERS WE WANT TO TAKE AT ONE
C       TIME FROM MESSG TO PRINT ON ONE LINE.
C
      LWRAP = MAX(16, MIN(132, NWRAP))
C
C       SET LENMSG TO THE LENGTH OF MESSG, IGNORE ANY TRAILING BLANKS.
C
      LENMSG = LEN(MESSG)
      N = LENMSG
      DO 20 I=1,N
         IF (MESSG(LENMSG:LENMSG) .NE. ' ') GO TO 30
         LENMSG = LENMSG - 1
   20 CONTINUE
   30 CONTINUE
C
C       IF THE MESSAGE IS ALL BLANKS, THEN PRINT ONE BLANK LINE.
C
      IF (LENMSG .EQ. 0) THEN
         CBUFF(LPREF+1:LPREF+1) = ' '
         DO 40 I=1,NUNIT
            WRITE(IU(I), '(A)') CBUFF(1:LPREF+1)
   40    CONTINUE
         RETURN
      ENDIF
C
C       SET NEXTC TO THE POSITION IN MESSG WHERE THE NEXT SUBSTRING
C       STARTS.  FROM THIS POSITION WE SCAN FOR THE NEW LINE SENTINEL.
C       WHEN NEXTC EXCEEDS LENMSG, THERE IS NO MORE TO PRINT.
C       WE LOOP BACK TO LABEL 50 UNTIL ALL PIECES HAVE BEEN PRINTED.
C
C       WE LOOK FOR THE NEXT OCCURRENCE OF THE NEW LINE SENTINEL.  THE
C       INDEX INTRINSIC FUNCTION RETURNS ZERO IF THERE IS NO OCCURRENCE
C       OR IF THE LENGTH OF THE FIRST ARGUMENT IS LESS THAN THE LENGTH
C       OF THE SECOND ARGUMENT.
C
C       THERE ARE SEVERAL CASES WHICH SHOULD BE CHECKED FOR IN THE
C       FOLLOWING ORDER.  WE ARE ATTEMPTING TO SET LPIECE TO THE NUMBER
C       OF CHARACTERS THAT SHOULD BE TAKEN FROM MESSG STARTING AT
C       POSITION NEXTC.
C
C       LPIECE .EQ. 0   THE NEW LINE SENTINEL DOES NOT OCCUR IN THE
C                       REMAINDER OF THE CHARACTER STRING.  LPIECE
C                       SHOULD BE SET TO LWRAP OR LENMSG+1-NEXTC,
C                       WHICHEVER IS LESS.
C
C       LPIECE .EQ. 1   THE NEW LINE SENTINEL STARTS AT MESSG(NEXTC:
C                       NEXTC).  LPIECE IS EFFECTIVELY ZERO, AND WE
C                       PRINT NOTHING TO AVOID PRODUCING UNNECESSARY
C                       BLANK LINES.  THIS TAKES CARE OF THE SITUATION
C                       WHERE THE LIBRARY ROUTINE HAS A MESSAGE OF
C                       EXACTLY 72 CHARACTERS FOLLOWED BY A NEW LINE
C                       SENTINEL FOLLOWED BY MORE CHARACTERS.  NEXTC
C                       SHOULD BE INCREMENTED BY 2.
C
C       LPIECE .GT. LWRAP+1  REDUCE LPIECE TO LWRAP.
C
C       ELSE            THIS LAST CASE MEANS 2 .LE. LPIECE .LE. LWRAP+1
C                       RESET LPIECE = LPIECE-1.  NOTE THAT THIS
C                       PROPERLY HANDLES THE END CASE WHERE LPIECE .EQ.
C                       LWRAP+1.  THAT IS, THE SENTINEL FALLS EXACTLY
C                       AT THE END OF A LINE.
C
      NEXTC = 1
   50 LPIECE = INDEX(MESSG(NEXTC:LENMSG), NEWLIN)
      IF (LPIECE .EQ. 0) THEN
C
C       THERE WAS NO NEW LINE SENTINEL FOUND.
C
         IDELTA = 0
         LPIECE = MIN(LWRAP, LENMSG+1-NEXTC)
         IF (LPIECE .LT. LENMSG+1-NEXTC) THEN
            DO 52 I=LPIECE+1,2,-1
               IF (MESSG(NEXTC+I-1:NEXTC+I-1) .EQ. ' ') THEN
                  LPIECE = I-1
                  IDELTA = 1
                  GOTO 54
               ENDIF
   52       CONTINUE
         ENDIF
   54    CBUFF(LPREF+1:LPREF+LPIECE) = MESSG(NEXTC:NEXTC+LPIECE-1)
         NEXTC = NEXTC + LPIECE + IDELTA
      ELSEIF (LPIECE .EQ. 1) THEN
C
C       WE HAVE A NEW LINE SENTINEL AT MESSG(NEXTC:NEXTC+1).
C       DON'T PRINT A BLANK LINE.
C
         NEXTC = NEXTC + 2
         GO TO 50
      ELSEIF (LPIECE .GT. LWRAP+1) THEN
C
C       LPIECE SHOULD BE SET DOWN TO LWRAP.
C
         IDELTA = 0
         LPIECE = LWRAP
         DO 56 I=LPIECE+1,2,-1
            IF (MESSG(NEXTC+I-1:NEXTC+I-1) .EQ. ' ') THEN
               LPIECE = I-1
               IDELTA = 1
               GOTO 58
            ENDIF
   56    CONTINUE
   58    CBUFF(LPREF+1:LPREF+LPIECE) = MESSG(NEXTC:NEXTC+LPIECE-1)
         NEXTC = NEXTC + LPIECE + IDELTA
      ELSE
C
C       IF WE ARRIVE HERE, IT MEANS 2 .LE. LPIECE .LE. LWRAP+1.
C       WE SHOULD DECREMENT LPIECE BY ONE.
C
         LPIECE = LPIECE - 1
         CBUFF(LPREF+1:LPREF+LPIECE) = MESSG(NEXTC:NEXTC+LPIECE-1)
         NEXTC  = NEXTC + LPIECE + 2
      ENDIF
C
C       PRINT
C
      DO 60 I=1,NUNIT
         WRITE(IU(I), '(A)') CBUFF(1:LPREF+LPIECE)
   60 CONTINUE
C
      IF (NEXTC .LE. LENMSG) GO TO 50
      RETURN
      END

c*************************************************************************
*DECK XERSVE
      SUBROUTINE XERSVE (LIBRAR, SUBROU, MESSG, KFLAG, NERR, LEVEL,
     +   ICOUNT)
C***BEGIN PROLOGUE  XERSVE
C***SUBSIDIARY
C***PURPOSE  Record that an error has occurred.
C***LIBRARY   SLATEC (XERROR)
C***CATEGORY  R3
C***TYPE      ALL (XERSVE-A)
C***KEYWORDS  ERROR, XERROR
C***AUTHOR  Jones, R. E., (SNLA)
C***DESCRIPTION
C
C *Usage:
C
C        INTEGER  KFLAG, NERR, LEVEL, ICOUNT
C        CHARACTER * (len) LIBRAR, SUBROU, MESSG
C
C        CALL XERSVE (LIBRAR, SUBROU, MESSG, KFLAG, NERR, LEVEL, ICOUNT)
C
C *Arguments:
C
C        LIBRAR :IN    is the library that the message is from.
C        SUBROU :IN    is the subroutine that the message is from.
C        MESSG  :IN    is the message to be saved.
C        KFLAG  :IN    indicates the action to be performed.
C                      when KFLAG > 0, the message in MESSG is saved.
C                      when KFLAG=0 the tables will be dumped and
C                      cleared.
C                      when KFLAG < 0, the tables will be dumped and
C                      not cleared.
C        NERR   :IN    is the error number.
C        LEVEL  :IN    is the error severity.
C        ICOUNT :OUT   the number of times this message has been seen,
C                      or zero if the table has overflowed and does not
C                      contain this message specifically.  When KFLAG=0,
C                      ICOUNT will not be altered.
C
C *Description:
C
C   Record that this error occurred and possibly dump and clear the
C   tables.
C
C***REFERENCES  R. E. Jones and D. K. Kahaner, XERROR, the SLATEC
C                 Error-handling Package, SAND82-0800, Sandia
C                 Laboratories, 1982.
C***ROUTINES CALLED  I1MACH, XGETUA
C***REVISION HISTORY  (YYMMDD)
C   800319  DATE WRITTEN
C   861211  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900413  Routine modified to remove reference to KFLAG.  (WRB)
C   900510  Changed to add LIBRARY NAME and SUBROUTINE to calling
C           sequence, use IF-THEN-ELSE, make number of saved entries
C           easily changeable, changed routine name from XERSAV to
C           XERSVE.  (RWC)
C   910626  Added LIBTAB and SUBTAB to SAVE statement.  (BKS)
C   920501  Reformatted the REFERENCES section.  (WRB)
C***END PROLOGUE  XERSVE
      PARAMETER (LENTAB=10)
      INTEGER LUN(5)
      CHARACTER*(*) LIBRAR, SUBROU, MESSG
      CHARACTER*8  LIBTAB(LENTAB), SUBTAB(LENTAB), LIB, SUB
      CHARACTER*20 MESTAB(LENTAB), MES
      DIMENSION NERTAB(LENTAB), LEVTAB(LENTAB), KOUNT(LENTAB)
      SAVE LIBTAB, SUBTAB, MESTAB, NERTAB, LEVTAB, KOUNT, KOUNTX, NMSG
      DATA KOUNTX/0/, NMSG/0/
C***FIRST EXECUTABLE STATEMENT  XERSVE
C
      IF (KFLAG.LE.0) THEN
C
C        Dump the table.
C
         IF (NMSG.EQ.0) RETURN
C
C        Print to each unit.
C
         CALL XGETUA (LUN, NUNIT)
         DO 20 KUNIT = 1,NUNIT
            IUNIT = LUN(KUNIT)
            IF (IUNIT.EQ.0) IUNIT = I1MACH(4)
C
C           Print the table header.
C
            WRITE (IUNIT,9000)
C
C           Print body of table.
C
            DO 10 I = 1,NMSG
               WRITE (IUNIT,9010) LIBTAB(I), SUBTAB(I), MESTAB(I),
     *            NERTAB(I),LEVTAB(I),KOUNT(I)
   10       CONTINUE
C
C           Print number of other errors.
C
            IF (KOUNTX.NE.0) WRITE (IUNIT,9020) KOUNTX
            WRITE (IUNIT,9030)
   20    CONTINUE
C
C        Clear the error tables.
C
         IF (KFLAG.EQ.0) THEN
            NMSG = 0
            KOUNTX = 0
         ENDIF
      ELSE
C
C        PROCESS A MESSAGE...
C        SEARCH FOR THIS MESSG, OR ELSE AN EMPTY SLOT FOR THIS MESSG,
C        OR ELSE DETERMINE THAT THE ERROR TABLE IS FULL.
C
         LIB = LIBRAR
         SUB = SUBROU
         MES = MESSG
         DO 30 I = 1,NMSG
            IF (LIB.EQ.LIBTAB(I) .AND. SUB.EQ.SUBTAB(I) .AND.
     *         MES.EQ.MESTAB(I) .AND. NERR.EQ.NERTAB(I) .AND.
     *         LEVEL.EQ.LEVTAB(I)) THEN
                  KOUNT(I) = KOUNT(I) + 1
                  ICOUNT = KOUNT(I)
                  RETURN
            ENDIF
   30    CONTINUE
C
         IF (NMSG.LT.LENTAB) THEN
C
C           Empty slot found for new message.
C
            NMSG = NMSG + 1
            LIBTAB(I) = LIB
            SUBTAB(I) = SUB
            MESTAB(I) = MES
            NERTAB(I) = NERR
            LEVTAB(I) = LEVEL
            KOUNT (I) = 1
            ICOUNT    = 1
         ELSE
C
C           Table is full.
C
            KOUNTX = KOUNTX+1
            ICOUNT = 0
         ENDIF
      ENDIF
      RETURN
C
C     Formats.
C
 9000 FORMAT ('0          ERROR MESSAGE SUMMARY' /
     +   ' LIBRARY    SUBROUTINE MESSAGE START             NERR',
     +   '     LEVEL     COUNT')
 9010 FORMAT (1X,A,3X,A,3X,A,3I10)
 9020 FORMAT ('0OTHER ERRORS NOT INDIVIDUALLY TABULATED = ', I10)
 9030 FORMAT (1X)
      END

c*************************************************************************
*DECK XGETUA
      SUBROUTINE XGETUA (IUNITA, N)
C***BEGIN PROLOGUE  XGETUA
C***PURPOSE  Return unit number(s) to which error messages are being
C            sent.
C***LIBRARY   SLATEC (XERROR)
C***CATEGORY  R3C
C***TYPE      ALL (XGETUA-A)
C***KEYWORDS  ERROR, XERROR
C***AUTHOR  Jones, R. E., (SNLA)
C***DESCRIPTION
C
C     Abstract
C        XGETUA may be called to determine the unit number or numbers
C        to which error messages are being sent.
C        These unit numbers may have been set by a call to XSETUN,
C        or a call to XSETUA, or may be a default value.
C
C     Description of Parameters
C      --Output--
C        IUNIT - an array of one to five unit numbers, depending
C                on the value of N.  A value of zero refers to the
C                default unit, as defined by the I1MACH machine
C                constant routine.  Only IUNIT(1),...,IUNIT(N) are
C                defined by XGETUA.  The values of IUNIT(N+1),...,
C                IUNIT(5) are not defined (for N .LT. 5) or altered
C                in any way by XGETUA.
C        N     - the number of units to which copies of the
C                error messages are being sent.  N will be in the
C                range from 1 to 5.
C
C***REFERENCES  R. E. Jones and D. K. Kahaner, XERROR, the SLATEC
C                 Error-handling Package, SAND82-0800, Sandia
C                 Laboratories, 1982.
C***ROUTINES CALLED  J4SAVE
C***REVISION HISTORY  (YYMMDD)
C   790801  DATE WRITTEN
C   861211  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   920501  Reformatted the REFERENCES section.  (WRB)
C***END PROLOGUE  XGETUA
      DIMENSION IUNITA(5)
C***FIRST EXECUTABLE STATEMENT  XGETUA
      N = J4SAVE(5,0,.FALSE.)
      DO 30 I=1,N
         INDEX = I+4
         IF (I.EQ.1) INDEX = 3
         IUNITA(I) = J4SAVE(INDEX,0,.FALSE.)
   30 CONTINUE
      RETURN
      END

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