strptime.c

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/*
 * Powerdog Industries kindly requests feedback from anyone modifying
 * this function:
 *
 * Date: Thu, 05 Jun 1997 23:17:17 -0400  
 * From: Kevin Ruddy <[e-mail]>
 * To: James FitzGibbon <[e-mail]>
 * Subject: Re: Use of your strptime(3) code (fwd)
 * 
 * The reason for the "no mod" clause was so that modifications would
 * come back and we could integrate them and reissue so that a wider 
 * audience could use it (thereby spreading the wealth).  This has   
 * made it possible to get strptime to work on many operating systems.
 * I'm not sure why that's "plain unacceptable" to the FreeBSD team.
 * 
 * Anyway, you can change it to "with or without modification" as
 * you see fit.  Enjoy.                                          
 * 
 * Kevin Ruddy
 * Powerdog Industries, Inc.
 */
/*
 * Copyright (c) 1994 Powerdog Industries.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgement:
 *      This product includes software developed by Powerdog Industries.
 * 4. The name of Powerdog Industries may not be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY POWERDOG INDUSTRIES ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE POWERDOG INDUSTRIES BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef LIBC_RCS
static const char rcsid[] =
	"$Id: strptime.c,v 1.4.2.1 1999/04/30 06:01:45 wes Exp $";
#endif

#ifndef lint
#ifndef NOID
static char copyright[] =
"@(#) Copyright (c) 1994 Powerdog Industries.  All rights reserved.";
static char sccsid[] = "@(#)strptime.c	0.1 (Powerdog) 94/03/27";
#endif /* !defined NOID */
#endif /* not lint */

#include <time.h>
#include <ctype.h>
#include <string.h>
#include "timelocal.h"

#define asizeof(a)	(sizeof (a) / sizeof ((a)[0]))

char *
strptime(const char *buf, const char *fmt, struct tm *tm)
{
	char	c;
	const char *ptr;
	int	i,
		len;

	ptr = fmt;
	while (*ptr != 0) {
		if (*buf == 0)
			break;

		c = *ptr++;

		if (c != '%') {
			if (isspace((unsigned char)c))
				while (*buf != 0 && isspace((unsigned char)*buf))
					buf++;
			else if (c != *buf++)
				return 0;
			continue;
		}

		c = *ptr++;
		switch (c) {
		case 0:
		case '%':
			if (*buf++ != '%')
				return 0;
			break;

		case 'C':
			buf = strptime(buf, Locale->date_fmt, tm);
			if (buf == 0)
				return 0;
			break;

		case 'c':
			buf = strptime(buf, "%x %X", tm);
			if (buf == 0)
				return 0;
			break;

		case 'D':
			buf = strptime(buf, "%m/%d/%y", tm);
			if (buf == 0)
				return 0;
			break;

		case 'R':
			buf = strptime(buf, "%H:%M", tm);
			if (buf == 0)
				return 0;
			break;

		case 'r':
			buf = strptime(buf, "%I:%M:%S %p", tm);
			if (buf == 0)
				return 0;
			break;

		case 'T':
			buf = strptime(buf, "%H:%M:%S", tm);
			if (buf == 0)
				return 0;
			break;

		case 'X':
			buf = strptime(buf, Locale->X_fmt, tm);
			if (buf == 0)
				return 0;
			break;

		case 'x':
			buf = strptime(buf, Locale->x_fmt, tm);
			if (buf == 0)
				return 0;
			break;

		case 'j':
			if (!isdigit((unsigned char)*buf))
				return 0;

			for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) {
				i *= 10;
				i += *buf - '0';
			}
			if (i > 365)
				return 0;

			tm->tm_yday = i;
			break;

		case 'M':
		case 'S':
			if (*buf == 0 || isspace((unsigned char)*buf))
				break;

			if (!isdigit((unsigned char)*buf))
				return 0;

			for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) {
				i *= 10;
				i += *buf - '0';
			}
			if (i > 59)
				return 0;

			if (c == 'M')
				tm->tm_min = i;
			else
				tm->tm_sec = i;

			if (*buf != 0 && isspace((unsigned char)*buf))
				while (*ptr != 0 && !isspace((unsigned char)*ptr))
					ptr++;
			break;

		case 'H':
		case 'I':
		case 'k':
		case 'l':
			if (!isdigit((unsigned char)*buf))
				return 0;

			for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) {
				i *= 10;
				i += *buf - '0';
			}
			if (c == 'H' || c == 'k') {
				if (i > 23)
					return 0;
			} else if (i > 11)
				return 0;

			tm->tm_hour = i;

			if (*buf != 0 && isspace((unsigned char)*buf))
				while (*ptr != 0 && !isspace((unsigned char)*ptr))
					ptr++;
			break;

		case 'p':
			len = strlen(Locale->am);
			if (strncasecmp(buf, Locale->am, len) == 0) {
				if (tm->tm_hour > 12)
					return 0;
				if (tm->tm_hour == 12)
					tm->tm_hour = 0;
				buf += len;
				break;
			}

			len = strlen(Locale->pm);
			if (strncasecmp(buf, Locale->pm, len) == 0) {
				if (tm->tm_hour > 12)
					return 0;
				if (tm->tm_hour != 12)
					tm->tm_hour += 12;
				buf += len;
				break;
			}

			return 0;

		case 'A':
		case 'a':
			for (i = 0; i < asizeof(Locale->weekday); i++) {
				len = strlen(Locale->weekday[i]);
				if (strncasecmp(buf,
						Locale->weekday[i],
						len) == 0)
					break;

				len = strlen(Locale->wday[i]);
				if (strncasecmp(buf,
						Locale->wday[i],
						len) == 0)
					break;
			}
			if (i == asizeof(Locale->weekday))
				return 0;

			tm->tm_wday = i;
			buf += len;
			break;

		case 'd':
		case 'e':
			if (!isdigit((unsigned char)*buf))
				return 0;

			for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) {
				i *= 10;
				i += *buf - '0';
			}
			if (i > 31)
				return 0;

			tm->tm_mday = i;

			if (*buf != 0 && isspace((unsigned char)*buf))
				while (*ptr != 0 && !isspace((unsigned char)*ptr))
					ptr++;
			break;

		case 'B':
		case 'b':
		case 'h':
			for (i = 0; i < asizeof(Locale->month); i++) {
				len = strlen(Locale->month[i]);
				if (strncasecmp(buf,
						Locale->month[i],
						len) == 0)
					break;

				len = strlen(Locale->mon[i]);
				if (strncasecmp(buf,
						Locale->mon[i],
						len) == 0)
					break;
			}
			if (i == asizeof(Locale->month))
				return 0;

			tm->tm_mon = i;
			buf += len;
			break;

		case 'm':
			if (!isdigit((unsigned char)*buf))
				return 0;

			for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) {
				i *= 10;
				i += *buf - '0';
			}
			if (i < 1 || i > 12)
				return 0;

			tm->tm_mon = i - 1;

			if (*buf != 0 && isspace((unsigned char)*buf))
				while (*ptr != 0 && !isspace((unsigned char)*ptr))
					ptr++;
			break;

		case 'Y':
		case 'y':
			if (*buf == 0 || isspace((unsigned char)*buf))
				break;

			if (!isdigit((unsigned char)*buf))
				return 0;

			for (i = 0; *buf != 0 && isdigit((unsigned char)*buf); buf++) {
				i *= 10;
				i += *buf - '0';
			}
			if (c == 'Y')
				i -= 1900;
			if (c == 'y' && i < 69)
				i += 100;
			if (i < 0)
				return 0;

			tm->tm_year = i;

			if (*buf != 0 && isspace((unsigned char)*buf))
				while (*ptr != 0 && !isspace((unsigned char)*ptr))
					ptr++;
			break;
		}
	}

	return (char *)buf;
}