freebsd-dev/lib/libc/stdtime/strptime.c
1997-08-13 13:11:53 +00:00

350 lines
7.7 KiB
C

/*
* Powerdog Industries kindly requests feedback from anyone modifying
* this function:
*
* Date: Thu, 05 Jun 1997 23:17:17 -0400
* From: Kevin Ruddy <kevin.ruddy@powerdog.com>
* To: James FitzGibbon <james@nexis.net>
* 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 1.2 1997/08/09 15:43:56 joerg 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]))
const 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 (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 buf;
}