if (strcmp(_ctloc(am_pm[0]), bp) == 0) {
len = strlen(_ctloc(am_pm[0])); if (strncasecmp(_ctloc(am_pm[0]), bp, len) == 0) {
_strptime(buf, fmt, tm, initialize)	const char *buf, *fmt;	struct tm *tm;	int initialize;{	char c;	const char *bp;	int alt_format, i, len;	static int century, relyear;	if (initialize) {		century = TM_YEAR_BASE;		relyear = -1;	}	bp = buf;	while ((c = *fmt) != '\0') {		/* Clear `alternate' modifier prior to new conversion. */		alt_format = 0;		/* Eat up white-space. */		if (isspace(c)) {			while (isspace(*bp))				bp++;			fmt++;			continue;		}						if ((c = *fmt++) != '%')			goto literal;again:		switch (c = *fmt++) {		case '%':	/* "%%" is converted to "%". */literal:		if (c != *bp++)			return (NULL);		break;		/*		 * "Alternative" modifiers. Just set the appropriate flag		 * and start over again.		 */		case 'E':	/* "%E?" alternative conversion modifier. */			_LEGAL_ALT(0);			alt_format |= _ALT_E;			goto again;		case 'O':	/* "%O?" alternative conversion modifier. */			_LEGAL_ALT(0);			alt_format |= _ALT_O;			goto again;					/*		 * "Complex" conversion rules, implemented through recursion.		 */		case 'c':	/* Date and time, using the locale's format. */			_LEGAL_ALT(_ALT_E);			if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, 0)))				return (NULL);			break;		case 'D':	/* The date as "%m/%d/%y". */			_LEGAL_ALT(0);			if (!(bp = _strptime(bp, "%m/%d/%y", tm, 0)))				return (NULL);			break;			case 'R':	/* The time as "%H:%M". */			_LEGAL_ALT(0);			if (!(bp = _strptime(bp, "%H:%M", tm, 0)))				return (NULL);			break;		case 'r':	/* The time as "%I:%M:%S %p". */			_LEGAL_ALT(0);			if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, 0)))				return (NULL);			break;		case 'T':	/* The time as "%H:%M:%S". */			_LEGAL_ALT(0);			if (!(bp = _strptime(bp, "%H:%M:%S", tm, 0)))				return (NULL);			break;		case 'X':	/* The time, using the locale's format. */			_LEGAL_ALT(_ALT_E);			if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, 0)))				return (NULL);			break;		case 'x':	/* The date, using the locale's format. */			_LEGAL_ALT(_ALT_E);			if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, 0)))				return (NULL);			break;		/*		 * "Elementary" conversion rules.		 */		case 'A':	/* The day of week, using the locale's form. */		case 'a':			_LEGAL_ALT(0);			for (i = 0; i < 7; i++) {				/* Full name. */				len = strlen(_ctloc(day[i]));				if (strncasecmp(_ctloc(day[i]), bp, len) == 0)					break;				/* Abbreviated name. */				len = strlen(_ctloc(abday[i]));				if (strncasecmp(_ctloc(abday[i]), bp, len) == 0)					break;			}			/* Nothing matched. */			if (i == 7)				return (NULL);			tm->tm_wday = i;			bp += len;			break;		case 'B':	/* The month, using the locale's form. */		case 'b':		case 'h':			_LEGAL_ALT(0);			for (i = 0; i < 12; i++) {				/* Full name. */				len = strlen(_ctloc(mon[i]));				if (strncasecmp(_ctloc(mon[i]), bp, len) == 0)					break;				/* Abbreviated name. */				len = strlen(_ctloc(abmon[i]));				if (strncasecmp(_ctloc(abmon[i]), bp, len) == 0)					break;			}			/* Nothing matched. */			if (i == 12)				return (NULL);			tm->tm_mon = i;			bp += len;			break;		case 'C':	/* The century number. */			_LEGAL_ALT(_ALT_E);			if (!(_conv_num(&bp, &i, 0, 99)))				return (NULL);			century = i * 100;			break;		case 'd':	/* The day of month. */		case 'e':			_LEGAL_ALT(_ALT_O);			if (!(_conv_num(&bp, &tm->tm_mday, 1, 31)))				return (NULL);			break;		case 'k':	/* The hour (24-hour clock representation). */			_LEGAL_ALT(0);			/* FALLTHROUGH */		case 'H':			_LEGAL_ALT(_ALT_O);			if (!(_conv_num(&bp, &tm->tm_hour, 0, 23)))				return (NULL);			break;		case 'l':	/* The hour (12-hour clock representation). */			_LEGAL_ALT(0);			/* FALLTHROUGH */		case 'I':			_LEGAL_ALT(_ALT_O);			if (!(_conv_num(&bp, &tm->tm_hour, 1, 12)))				return (NULL);			break;		case 'j':	/* The day of year. */			_LEGAL_ALT(0);			if (!(_conv_num(&bp, &tm->tm_yday, 1, 366)))				return (NULL);			tm->tm_yday--;			break;		case 'M':	/* The minute. */			_LEGAL_ALT(_ALT_O);			if (!(_conv_num(&bp, &tm->tm_min, 0, 59)))				return (NULL);			break;		case 'm':	/* The month. */			_LEGAL_ALT(_ALT_O);			if (!(_conv_num(&bp, &tm->tm_mon, 1, 12)))				return (NULL);			tm->tm_mon--;			break;		case 'p':	/* The locale's equivalent of AM/PM. */			_LEGAL_ALT(0);			/* AM? */			if (strcmp(_ctloc(am_pm[0]), bp) == 0) {				if (tm->tm_hour > 12)	/* i.e., 13:00 AM ?! */					return (NULL);				else if (tm->tm_hour == 12)					tm->tm_hour = 0;				bp += strlen(_ctloc(am_pm[0]));				break;			}			/* PM? */			else if (strcmp(_ctloc(am_pm[1]), bp) == 0) {				if (tm->tm_hour > 12)	/* i.e., 13:00 PM ?! */					return (NULL);				else if (tm->tm_hour < 12)					tm->tm_hour += 12;				bp += strlen(_ctloc(am_pm[1]));				break;			}			/* Nothing matched. */			return (NULL);		case 'S':	/* The seconds. */			_LEGAL_ALT(_ALT_O);			if (!(_conv_num(&bp, &tm->tm_sec, 0, 61)))				return (NULL);			break;		case 'U':	/* The week of year, beginning on sunday. */		case 'W':	/* The week of year, beginning on monday. */			_LEGAL_ALT(_ALT_O);			/*			 * XXX This is bogus, as we can not assume any valid			 * information present in the tm structure at this			 * point to calculate a real value, so just check the			 * range for now.			 */			 if (!(_conv_num(&bp, &i, 0, 53)))				return (NULL);			 break;		case 'w':	/* The day of week, beginning on sunday. */			_LEGAL_ALT(_ALT_O);			if (!(_conv_num(&bp, &tm->tm_wday, 0, 6)))				return (NULL);			break;		case 'Y':	/* The year. */			_LEGAL_ALT(_ALT_E);			if (!(_conv_num(&bp, &i, 0, INT_MAX)))				return (NULL);			relyear = -1;			tm->tm_year = i - TM_YEAR_BASE;			break;		case 'y':	/* The year within the century (2 digits). */			_LEGAL_ALT(_ALT_E | _ALT_O);			if (!(_conv_num(&bp, &relyear, 0, 99)))				return (NULL);			break;		/*		 * Miscellaneous conversions.		 */		case 'n':	/* Any kind of white-space. */		case 't':			_LEGAL_ALT(0);			while (isspace(*bp))				bp++;			break;		default:	/* Unknown/unsupported conversion. */			return (NULL);		}	}	/*	 * We need to evaluate the two digit year spec (%y)	 * last as we can get a century spec (%C) at any time.	 */	if (relyear != -1) {		if (century == TM_YEAR_BASE) {			if (relyear <= 68)				tm->tm_year = relyear + 2000 - TM_YEAR_BASE;			else				tm->tm_year = relyear + 1900 - TM_YEAR_BASE;		} else {			tm->tm_year = relyear + century - TM_YEAR_BASE;		}	}	return ((char *)bp);}