rem: int wc;
add: wchar_t wc;
context: vfprintf(fp, fmt0, ap)	FILE *fp;	const char *fmt0;	va_list ap;{	register char *fmt;	/* format string */	register int ch;	/* character from fmt */	register int n, m, n2;	/* handy integers (short term usage) */	register char *cp;	/* handy char pointer (short term usage) */	register struct __siov *iovp;/* for PRINT macro */	register int flags;	/* flags as above */	int ret;		/* return value accumulator */	int width;		/* width from format (%8d), or 0 */	int prec;		/* precision from format (%.3d), or -1 */	char sign;		/* sign prefix (' ', '+', '-', or \0) */	int wc;#ifdef FLOATING_POINT	char *decimal_point = localeconv()->decimal_point;	char softsign;		/* temporary negative sign for floats */	double _double;		/* double precision arguments %[eEfgG] */	int expt;		/* integer value of exponent */	int expsize;		/* character count for expstr */	int ndig;		/* actual number of digits returned by cvt */	char expstr[7];		/* buffer for exponent string */#endif#ifdef __GNUC__			/* gcc has builtin quad type (long long) SOS */#define	quad_t	  long long#define	u_quad_t  unsigned long long#endif	u_quad_t _uquad;	/* integer arguments %[diouxX] */	enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */	int dprec;		/* a copy of prec if [diouxX], 0 otherwise */	int realsz;		/* field size expanded by dprec */	int size;		/* size of converted field or string */	char *xdigs=NULL;	/* digits for [xX] conversion */#define NIOV 8	struct __suio uio;	/* output information: summary */	struct __siov iov[NIOV];/* ... and individual io vectors */	char buf[BUF];		/* space for %c, %[diouxX], %[eEfgG] */	char ox[2];		/* space for 0x hex-prefix */	va_list *argtable;        /* args, built due to positional arg */	va_list statargtable[STATIC_ARG_TBL_SIZE];	int nextarg;            /* 1-based argument index */	va_list orgap;          /* original argument pointer */	/*	 * Choose PADSIZE to trade efficiency vs. size.  If larger printf	 * fields occur frequently, increase PADSIZE and make the initialisers	 * below longer.	 */#define	PADSIZE	16		/* pad chunk size */	static char blanks[PADSIZE] =	 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};	static char zeroes[PADSIZE] =	 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};	/*	 * BEWARE, these `goto error' on error, and PAD uses `n'.	 */#define	PRINT(ptr, len) do { \	iovp->iov_base = (ptr); \	iovp->iov_len = (len); \	uio.uio_resid += (len); \	iovp++; \	if (++uio.uio_iovcnt >= NIOV) { \		if (__sprint(fp, &uio)) \			goto error; \		iovp = iov; \	} \} while (0)#define	PAD(howmany, with) do { \	if ((n = (howmany)) > 0) { \		while (n > PADSIZE) { \			PRINT(with, PADSIZE); \			n -= PADSIZE; \		} \		PRINT(with, n); \	} \} while (0)#define	FLUSH() do { \	if (uio.uio_resid && __sprint(fp, &uio)) \		goto error; \	uio.uio_iovcnt = 0; \	iovp = iov; \} while (0)	/*	 * To extend shorts properly, we need both signed and unsigned	 * argument extraction methods.	 */#define	SARG() \	(flags&QUADINT ? va_arg(ap, quad_t) : \	    flags&LONGINT ? GETARG(long) : \	    flags&SHORTINT ? (long)(short)GETARG(int) : \	    (long)GETARG(int))#define	UARG() \	(flags&QUADINT ? va_arg(ap, u_quad_t) : \	    flags&LONGINT ? GETARG(u_long) : \	    flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \	    (u_long)GETARG(u_int))          /*          * Get * arguments, including the form *nn$.  Preserve the nextarg          * that the argument can be gotten once the type is determined.          */#define GETASTER(val) \	 n2 = 0; \	 cp = fmt; \	 while (is_digit(*cp)) { \		 n2 = 10 * n2 + to_digit(*cp); \		 cp++; \	 } \	 if (*cp == '$') { \	       int hold = nextarg; \		 if (argtable == NULL) { \			 argtable = statargtable; \			 __find_arguments(fmt0, orgap, &argtable); \		 } \		 nextarg = n2; \		 val = GETARG(int); \		 nextarg = hold; \		 fmt = ++cp; \	} \	else { \	       val = GETARG(int); \	 }/** Get the argument indexed by nextarg.   If the argument table is* built, use it to get the argument.  If its not, get the next* argument (and arguments must be gotten sequentially).*/#define GETARG(type) \	(((argtable != NULL) ? (void)(ap = argtable[nextarg]) : (void)0), \	 nextarg++, va_arg(ap, type)) 	/* sorry, fprintf(read_only_file, "") returns EOF, not 0 */	if (cantwrite(fp)) {		errno = EBADF;		return (EOF);	}	/* optimise fprintf(stderr) (and other unbuffered Unix files) */	if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&	    fp->_file >= 0)		return (__sbprintf(fp, fmt0, ap));	fmt = (char *)fmt0;	argtable = NULL;	nextarg = 1;	orgap = ap;	uio.uio_iov = iovp = iov;	uio.uio_resid = 0;	uio.uio_iovcnt = 0;	ret = 0;	/*	 * Scan the format for conversions (`%' character).	 */	for (;;) {		cp = fmt;		while ((n = mbtowc(&wc, fmt, MB_CUR_MAX)) > 0) {			fmt += n;			if (wc == '%') {				fmt--;				break;			}		}		if ((m = fmt - cp) != 0) {			PRINT(cp, m);			ret += m;		}		if (n <= 0)			goto done;		fmt++;		/* skip over '%' */		flags = 0;		dprec = 0;		width = 0;		prec = -1;		sign = '\0';rflag:		ch = *fmt++;reswitch:	switch (ch) {		case ' ':			/*			 * ``If the space and + flags both appear, the space			 * flag will be ignored.''			 *	-- ANSI X3J11			 */			if (!sign)				sign = ' ';			goto rflag;		case '#':			flags |= ALT;			goto rflag;		case '*':			/*			 * ``A negative field width argument is taken as a			 * - flag followed by a positive field width.''			 *	-- ANSI X3J11			 * They don't exclude field widths read from args.			 */			GETASTER(width);			if (width >= 0)				goto rflag;			width = -width;			/* FALLTHROUGH */		case '-':			flags |= LADJUST;			goto rflag;		case '+':			sign = '+';			goto rflag;		case '.':			if ((ch = *fmt++) == '*') {				GETASTER(n);				prec = n < 0 ? -1 : n;				goto rflag;			}			n = 0;			while (is_digit(ch)) {				n = 10 * n + to_digit(ch);				ch = *fmt++;			}			if (ch == '$') {				nextarg = n;				if (argtable == NULL) {					argtable = statargtable;					__find_arguments(fmt0, orgap,					    &argtable);				}				goto rflag;			}			prec = n < 0 ? -1 : n;			goto reswitch;		case '0':			/*			 * ``Note that 0 is taken as a flag, not as the			 * beginning of a field width.''			 *	-- ANSI X3J11			 */			flags |= ZEROPAD;			goto rflag;		case '1': case '2': case '3': case '4':		case '5': case '6': case '7': case '8': case '9':			n = 0;			do {				n = 10 * n + to_digit(ch);				ch = *fmt++;			} while (is_digit(ch));                       	if (ch == '$') {				nextarg = n;			   	if (argtable == NULL) {			   		argtable = statargtable;			   		__find_arguments(fmt0, orgap,					    &argtable);			  	}				goto rflag; 			}			width = n;			goto reswitch;#ifdef FLOATING_POINT		case 'L':			flags |= LONGDBL;			goto rflag;#endif		case 'h':			flags |= SHORTINT;			goto rflag;		case 'l':			if (*fmt == 'l') {				fmt++;				flags |= QUADINT;			} else {				flags |= LONGINT;			}			goto rflag;		case 'q':			flags |= QUADINT;			goto rflag;		case 'c':			*(cp = buf) = GETARG(int);			size = 1;			sign = '\0';			break;		case 'D':			flags |= LONGINT;			/*FALLTHROUGH*/		case 'd':		case 'i':			_uquad = SARG();			if ((quad_t)_uquad < 0) {				_uquad = -_uquad;				sign = '-';			}			base = DEC;			goto number;#ifdef FLOATING_POINT		case 'e':		case 'E':		case 'f':		case 'g':		case 'G':			if (prec == -1) {				prec = DEFPREC;			} else if ((ch == 'g' || ch == 'G') && prec == 0) {				prec = 1;			}			if (flags & LONGDBL) {				_double = (double) GETARG(long double);			} else {				_double = GETARG(double);			}			/* do this before tricky precision changes */			if (isinf(_double)) {				if (_double < 0)					sign = '-';				cp = "Inf";				size = 3;				break;			}			if (isnan(_double)) {				cp = "NaN";				size = 3;				break;			}			flags |= FPT;			cp = cvt(_double, prec, flags, &softsign,				&expt, ch, &ndig);			if (ch == 'g' || ch == 'G') {				if (expt <= -4 || expt > prec)					ch = (ch == 'g') ? 'e' : 'E';				else					ch = 'g';			} 			if (ch <= 'e') {	/* 'e' or 'E' fmt */				--expt;				expsize = exponent(expstr, expt, ch);				size = expsize + ndig;				if (ndig > 1 || flags & ALT)					++size;			} else if (ch == 'f') {		/* f fmt */				if (expt > 0) {					size = expt;					if (prec || flags & ALT)						size += prec + 1;				} else	/* "0.X" */					size = prec + 2;			} else if (expt >= ndig) {	/* fixed g fmt */				size = expt;				if (flags & ALT)					++size;			} else				size = ndig + (expt > 0 ?					1 : 2 - expt);			if (softsign)				sign = '-';			break;#endif /* FLOATING_POINT */		case 'n':			if (flags & QUADINT)				*GETARG(quad_t *) = ret;			else if (flags & LONGINT)				*GETARG(long *) = ret;			else if (flags & SHORTINT)				*GETARG(short *) = ret;			else				*GETARG(int *) = ret;			continue;	/* no output */		case 'O':			flags |= LONGINT;			/*FALLTHROUGH*/		case 'o':			_uquad = UARG();			base = OCT;			goto nosign;		case 'p':			/*			 * ``The argument shall be a pointer to void.  The			 * value of the pointer is converted to a sequence			 * of printable characters, in an implementation-			 * defined manner.''			 *	-- ANSI X3J11			 */			/* NOSTRICT */			_uquad = (u_long)GETARG(void *);			base = HEX;			xdigs = "0123456789abcdef";			flags |= HEXPREFIX;			ch = 'x';			goto nosign;		case 's':			if ((cp = GETARG(char *)) == NULL)				cp = "(null)";			if (prec >= 0) {				/*				 * can't use strlen; can only look for the				 * NUL in the first `prec' characters, and				 * strlen() will go further.				 */				char *p = memchr(cp, 0, prec);				if (p != NULL) {					size = p - cp;					if (size > prec)						size = prec;				} else					size = prec;			} else				size = strlen(cp);			sign = '\0';			break;		case 'U':			flags |= LONGINT;			/*FALLTHROUGH*/		case 'u':			_uquad = UARG();			base = DEC;			goto nosign;		case 'X':			xdigs = "0123456789ABCDEF";			goto hex;		case 'x':			xdigs = "0123456789abcdef";hex:			_uquad = UARG();			base = HEX;			/* leading 0x/X only if non-zero */			if (flags & ALT && _uquad != 0)				flags |= HEXPREFIX;			/* unsigned conversions */nosign:			sign = '\0';			/*			 * ``... diouXx conversions ... if a precision is			 * specified, the 0 flag will be ignored.''			 *	-- ANSI X3J11			 */number:			if ((dprec = prec) >= 0)				flags &= ~ZEROPAD;			/*			 * ``The result of converting a zero value with an			 * explicit precision of zero is no characters.''			 *	-- ANSI X3J11			 */			cp = buf + BUF;			if (_uquad != 0 || prec != 0) {				/*				 * Unsigned mod is hard, and unsigned mod				 * by a constant is easier than that by				 * a variable; hence this switch.				 */				switch (base) {				case OCT:					do {						*--cp = to_char(_uquad & 7);						_uquad >>= 3;					} while (_uquad);					/* handle octal leading 0 */					if (flags & ALT && *cp != '0')						*--cp = '0';					break;				case DEC:					/* many numbers are 1 digit */					while (_uquad >= 10) {						*--cp = to_char(_uquad % 10);						_uquad /= 10;					}					*--cp = to_char(_uquad);					break;				case HEX:					do {						*--cp = xdigs[_uquad & 15];						_uquad >>= 4;					} while (_uquad);					break;				default:					cp = "bug in vfprintf: bad base";					size = strlen(cp);					goto skipsize;				}			}			size = buf + BUF - cp;		skipsize:			break;		default:	/* "%?" prints ?, unless ? is NUL */			if (ch == '\0')				goto done;			/* pretend it was %c with argument ch */			cp = buf;			*cp = ch;			size = 1;			sign = '\0';			break;		}		/*		 * All reasonable formats wind up here.  At this point, `cp'		 * points to a string which (if not flags&LADJUST) should be		 * padded out to `width' places.  If flags&ZEROPAD, it should		 * first be prefixed by any sign or other prefix; otherwise,		 * it should be blank padded before the prefix is emitted.		 * After any left-hand padding and prefixing, emit zeroes		 * required by a decimal [diouxX] precision, then print the		 * string proper, then emit zeroes required by any leftover		 * floating precision; finally, if LADJUST, pad with blanks.		 *		 * Compute actual size, so we know how much to pad.		 * size excludes decimal prec; realsz includes it.		 */		realsz = dprec > size ? dprec : size;		if (sign)			realsz++;		else if (flags & HEXPREFIX)			realsz+= 2;		/* right-adjusting blank padding */		if ((flags & (LADJUST|ZEROPAD)) == 0)			PAD(width - realsz, blanks);		/* prefix */		if (sign) {			PRINT(&sign, 1);		} else if (flags & HEXPREFIX) {			ox[0] = '0';			ox[1] = ch;			PRINT(ox, 2);		}		/* right-adjusting zero padding */		if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)			PAD(width - realsz, zeroes);		/* leading zeroes from decimal precision */		PAD(dprec - size, zeroes);		/* the string or number proper */#ifdef FLOATING_POINT		if ((flags & FPT) == 0) {			PRINT(cp, size);		} else {	/* glue together f_p fragments */			if (ch >= 'f') {	/* 'f' or 'g' */				if (_double == 0) {					/* kludge for __dtoa irregularity */					PRINT("0", 1);					if (expt < ndig || (flags & ALT) != 0) {						PRINT(decimal_point, 1);						PAD(ndig - 1, zeroes);					}				} else if (expt <= 0) {					PRINT("0", 1);					PRINT(decimal_point, 1);					PAD(-expt, zeroes);					PRINT(cp, ndig);				} else if (expt >= ndig) {					PRINT(cp, ndig);					PAD(expt - ndig, zeroes);					if (flags & ALT)						PRINT(".", 1);				} else {					PRINT(cp, expt);					cp += expt;					PRINT(".", 1);					PRINT(cp, ndig-expt);				}			} else {	/* 'e' or 'E' */				if (ndig > 1 || flags & ALT) {					ox[0] = *cp++;					ox[1] = '.';					PRINT(ox, 2);					if (_double) {						PRINT(cp, ndig-1);					} else	/* 0.[0..] */						/* __dtoa irregularity */						PAD(ndig - 1, zeroes);				} else	/* XeYYY */					PRINT(cp, 1);				PRINT(expstr, expsize);			}		}#else		PRINT(cp, size);#endif		/* left-adjusting padding (always blank) */		if (flags & LADJUST)			PAD(width - realsz, blanks);		/* finally, adjust ret */		ret += width > realsz ? width : realsz;		FLUSH();	/* copy out the I/O vectors */	}done:	FLUSH();error:	if (argtable != NULL && argtable != statargtable)		free(argtable);	return (__sferror(fp) ? EOF : ret);	/* NOTREACHED */}