freebsd-dev/lib/libc/stdtime/strptime.c
Andrey A. Chernov 097c578c1e 1) Fix the case we have less arguments for format string than we expected.
2) Return error on unsupported format specs.
(both according to POSIX)

PR:     93197
2014-10-07 06:34:05 +00:00

690 lines
15 KiB
C

/*-
* Copyright (c) 2014 Gary Mills
* Copyright 2011, Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 1994 Powerdog Industries. All rights reserved.
*
* Copyright (c) 2011 The FreeBSD Foundation
* All rights reserved.
* Portions of this software were developed by David Chisnall
* under sponsorship from the FreeBSD Foundation.
*
* 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.
*
* 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.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of Powerdog Industries.
*/
#include <sys/cdefs.h>
#ifndef lint
#ifndef NOID
static char copyright[] __unused =
"@(#) Copyright (c) 1994 Powerdog Industries. All rights reserved.";
static char sccsid[] __unused = "@(#)strptime.c 0.1 (Powerdog) 94/03/27";
#endif /* !defined NOID */
#endif /* not lint */
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <time.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "timelocal.h"
#include "tzfile.h"
static char * _strptime(const char *, const char *, struct tm *, int *, locale_t);
#define asizeof(a) (sizeof(a) / sizeof((a)[0]))
#define FLAG_NONE (1 << 0)
#define FLAG_YEAR (1 << 1)
#define FLAG_MONTH (1 << 2)
#define FLAG_YDAY (1 << 3)
#define FLAG_MDAY (1 << 4)
#define FLAG_WDAY (1 << 5)
/*
* Calculate the week day of the first day of a year. Valid for
* the Gregorian calendar, which began Sept 14, 1752 in the UK
* and its colonies. Ref:
* http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
*/
static int
first_wday_of(int year)
{
return (((2 * (3 - (year / 100) % 4)) + (year % 100) +
((year % 100) / 4) + (isleap(year) ? 6 : 0) + 1) % 7);
}
static char *
_strptime(const char *buf, const char *fmt, struct tm *tm, int *GMTp,
locale_t locale)
{
char c;
const char *ptr;
int day_offset = -1, wday_offset;
int week_offset;
int i, len;
int flags;
int Ealternative, Oalternative;
const struct lc_time_T *tptr = __get_current_time_locale(locale);
static int start_of_month[2][13] = {
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
};
flags = FLAG_NONE;
ptr = fmt;
while (*ptr != 0) {
c = *ptr++;
if (c != '%') {
if (isspace_l((unsigned char)c, locale))
while (*buf != 0 &&
isspace_l((unsigned char)*buf, locale))
buf++;
else if (c != *buf++)
return (NULL);
continue;
}
Ealternative = 0;
Oalternative = 0;
label:
c = *ptr++;
switch (c) {
case '%':
if (*buf++ != '%')
return (NULL);
break;
case '+':
buf = _strptime(buf, tptr->date_fmt, tm, GMTp, locale);
if (buf == NULL)
return (NULL);
flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
break;
case 'C':
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
/* XXX This will break for 3-digit centuries. */
len = 2;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++) {
i *= 10;
i += *buf - '0';
len--;
}
if (i < 19)
return (NULL);
tm->tm_year = i * 100 - TM_YEAR_BASE;
flags |= FLAG_YEAR;
break;
case 'c':
buf = _strptime(buf, tptr->c_fmt, tm, GMTp, locale);
if (buf == NULL)
return (NULL);
flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
break;
case 'D':
buf = _strptime(buf, "%m/%d/%y", tm, GMTp, locale);
if (buf == NULL)
return (NULL);
flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
break;
case 'E':
if (Ealternative || Oalternative)
break;
Ealternative++;
goto label;
case 'O':
if (Ealternative || Oalternative)
break;
Oalternative++;
goto label;
case 'F':
buf = _strptime(buf, "%Y-%m-%d", tm, GMTp, locale);
if (buf == NULL)
return (NULL);
flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
break;
case 'R':
buf = _strptime(buf, "%H:%M", tm, GMTp, locale);
if (buf == NULL)
return (NULL);
break;
case 'r':
buf = _strptime(buf, tptr->ampm_fmt, tm, GMTp, locale);
if (buf == NULL)
return (NULL);
break;
case 'T':
buf = _strptime(buf, "%H:%M:%S", tm, GMTp, locale);
if (buf == NULL)
return (NULL);
break;
case 'X':
buf = _strptime(buf, tptr->X_fmt, tm, GMTp, locale);
if (buf == NULL)
return (NULL);
break;
case 'x':
buf = _strptime(buf, tptr->x_fmt, tm, GMTp, locale);
if (buf == NULL)
return (NULL);
flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
break;
case 'j':
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
len = 3;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++){
i *= 10;
i += *buf - '0';
len--;
}
if (i < 1 || i > 366)
return (NULL);
tm->tm_yday = i - 1;
flags |= FLAG_YDAY;
break;
case 'M':
case 'S':
if (*buf == 0 ||
isspace_l((unsigned char)*buf, locale))
break;
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
len = 2;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++){
i *= 10;
i += *buf - '0';
len--;
}
if (c == 'M') {
if (i > 59)
return (NULL);
tm->tm_min = i;
} else {
if (i > 60)
return (NULL);
tm->tm_sec = i;
}
break;
case 'H':
case 'I':
case 'k':
case 'l':
/*
* Of these, %l is the only specifier explicitly
* documented as not being zero-padded. However,
* there is no harm in allowing zero-padding.
*
* XXX The %l specifier may gobble one too many
* digits if used incorrectly.
*/
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
len = 2;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++) {
i *= 10;
i += *buf - '0';
len--;
}
if (c == 'H' || c == 'k') {
if (i > 23)
return (NULL);
} else if (i > 12)
return (NULL);
tm->tm_hour = i;
break;
case 'p':
/*
* XXX This is bogus if parsed before hour-related
* specifiers.
*/
len = strlen(tptr->am);
if (strncasecmp_l(buf, tptr->am, len, locale) == 0) {
if (tm->tm_hour > 12)
return (NULL);
if (tm->tm_hour == 12)
tm->tm_hour = 0;
buf += len;
break;
}
len = strlen(tptr->pm);
if (strncasecmp_l(buf, tptr->pm, len, locale) == 0) {
if (tm->tm_hour > 12)
return (NULL);
if (tm->tm_hour != 12)
tm->tm_hour += 12;
buf += len;
break;
}
return (NULL);
case 'A':
case 'a':
for (i = 0; i < asizeof(tptr->weekday); i++) {
len = strlen(tptr->weekday[i]);
if (strncasecmp_l(buf, tptr->weekday[i],
len, locale) == 0)
break;
len = strlen(tptr->wday[i]);
if (strncasecmp_l(buf, tptr->wday[i],
len, locale) == 0)
break;
}
if (i == asizeof(tptr->weekday))
return (NULL);
buf += len;
tm->tm_wday = i;
flags |= FLAG_WDAY;
break;
case 'U':
case 'W':
/*
* 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 (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
len = 2;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++) {
i *= 10;
i += *buf - '0';
len--;
}
if (i > 53)
return (NULL);
if (c == 'U')
day_offset = TM_SUNDAY;
else
day_offset = TM_MONDAY;
week_offset = i;
break;
case 'w':
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
i = *buf - '0';
if (i > 6)
return (NULL);
tm->tm_wday = i;
flags |= FLAG_WDAY;
break;
case 'e':
/*
* With %e format, our strftime(3) adds a blank space
* before single digits.
*/
if (*buf != 0 &&
isspace_l((unsigned char)*buf, locale))
buf++;
/* FALLTHROUGH */
case 'd':
/*
* The %e specifier was once explicitly documented as
* not being zero-padded but was later changed to
* equivalent to %d. There is no harm in allowing
* such padding.
*
* XXX The %e specifier may gobble one too many
* digits if used incorrectly.
*/
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
len = 2;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++) {
i *= 10;
i += *buf - '0';
len--;
}
if (i > 31)
return (NULL);
tm->tm_mday = i;
flags |= FLAG_MDAY;
break;
case 'B':
case 'b':
case 'h':
for (i = 0; i < asizeof(tptr->month); i++) {
if (Oalternative) {
if (c == 'B') {
len = strlen(tptr->alt_month[i]);
if (strncasecmp_l(buf,
tptr->alt_month[i],
len, locale) == 0)
break;
}
} else {
len = strlen(tptr->month[i]);
if (strncasecmp_l(buf, tptr->month[i],
len, locale) == 0)
break;
}
}
/*
* Try the abbreviated month name if the full name
* wasn't found and Oalternative was not requested.
*/
if (i == asizeof(tptr->month) && !Oalternative) {
for (i = 0; i < asizeof(tptr->month); i++) {
len = strlen(tptr->mon[i]);
if (strncasecmp_l(buf, tptr->mon[i],
len, locale) == 0)
break;
}
}
if (i == asizeof(tptr->month))
return (NULL);
tm->tm_mon = i;
buf += len;
flags |= FLAG_MONTH;
break;
case 'm':
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
len = 2;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++) {
i *= 10;
i += *buf - '0';
len--;
}
if (i < 1 || i > 12)
return (NULL);
tm->tm_mon = i - 1;
flags |= FLAG_MONTH;
break;
case 's':
{
char *cp;
int sverrno;
long n;
time_t t;
sverrno = errno;
errno = 0;
n = strtol_l(buf, &cp, 10, locale);
if (errno == ERANGE || (long)(t = n) != n) {
errno = sverrno;
return (NULL);
}
errno = sverrno;
buf = cp;
if (gmtime_r(&t, tm) == NULL)
return (NULL);
*GMTp = 1;
flags |= FLAG_YDAY | FLAG_WDAY | FLAG_MONTH |
FLAG_MDAY | FLAG_YEAR;
}
break;
case 'Y':
case 'y':
if (*buf == 0 ||
isspace_l((unsigned char)*buf, locale))
break;
if (!isdigit_l((unsigned char)*buf, locale))
return (NULL);
len = (c == 'Y') ? 4 : 2;
for (i = 0; len && *buf != 0 &&
isdigit_l((unsigned char)*buf, locale); buf++) {
i *= 10;
i += *buf - '0';
len--;
}
if (c == 'Y')
i -= TM_YEAR_BASE;
if (c == 'y' && i < 69)
i += 100;
if (i < 0)
return (NULL);
tm->tm_year = i;
flags |= FLAG_YEAR;
break;
case 'Z':
{
const char *cp;
char *zonestr;
for (cp = buf; *cp &&
isupper_l((unsigned char)*cp, locale); ++cp) {
/*empty*/}
if (cp - buf) {
zonestr = alloca(cp - buf + 1);
strncpy(zonestr, buf, cp - buf);
zonestr[cp - buf] = '\0';
tzset();
if (0 == strcmp(zonestr, "GMT") ||
0 == strcmp(zonestr, "UTC")) {
*GMTp = 1;
} else if (0 == strcmp(zonestr, tzname[0])) {
tm->tm_isdst = 0;
} else if (0 == strcmp(zonestr, tzname[1])) {
tm->tm_isdst = 1;
} else {
return (NULL);
}
buf += cp - buf;
}
}
break;
case 'z':
{
int sign = 1;
if (*buf != '+') {
if (*buf == '-')
sign = -1;
else
return (NULL);
}
buf++;
i = 0;
for (len = 4; len > 0; len--) {
if (isdigit_l((unsigned char)*buf, locale)) {
i *= 10;
i += *buf - '0';
buf++;
} else
return (NULL);
}
tm->tm_hour -= sign * (i / 100);
tm->tm_min -= sign * (i % 100);
*GMTp = 1;
}
break;
case 'n':
case 't':
while (isspace_l((unsigned char)*buf, locale))
buf++;
break;
default:
return (NULL);
}
}
if (!(flags & FLAG_YDAY) && (flags & FLAG_YEAR)) {
if ((flags & (FLAG_MONTH | FLAG_MDAY)) ==
(FLAG_MONTH | FLAG_MDAY)) {
tm->tm_yday = start_of_month[isleap(tm->tm_year +
TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
flags |= FLAG_YDAY;
} else if (day_offset != -1) {
/* Set the date to the first Sunday (or Monday)
* of the specified week of the year.
*/
if (!(flags & FLAG_WDAY)) {
tm->tm_wday = day_offset;
flags |= FLAG_WDAY;
}
tm->tm_yday = (7 -
first_wday_of(tm->tm_year + TM_YEAR_BASE) +
day_offset) % 7 + (week_offset - 1) * 7 +
tm->tm_wday - day_offset;
flags |= FLAG_YDAY;
}
}
if ((flags & (FLAG_YEAR | FLAG_YDAY)) == (FLAG_YEAR | FLAG_YDAY)) {
if (!(flags & FLAG_MONTH)) {
i = 0;
while (tm->tm_yday >=
start_of_month[isleap(tm->tm_year +
TM_YEAR_BASE)][i])
i++;
if (i > 12) {
i = 1;
tm->tm_yday -=
start_of_month[isleap(tm->tm_year +
TM_YEAR_BASE)][12];
tm->tm_year++;
}
tm->tm_mon = i - 1;
flags |= FLAG_MONTH;
}
if (!(flags & FLAG_MDAY)) {
tm->tm_mday = tm->tm_yday -
start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)]
[tm->tm_mon] + 1;
flags |= FLAG_MDAY;
}
if (!(flags & FLAG_WDAY)) {
i = 0;
wday_offset = first_wday_of(tm->tm_year);
while (i++ <= tm->tm_yday) {
if (wday_offset++ >= 6)
wday_offset = 0;
}
tm->tm_wday = wday_offset;
flags |= FLAG_WDAY;
}
}
return ((char *)buf);
}
char *
strptime_l(const char * __restrict buf, const char * __restrict fmt,
struct tm * __restrict tm, locale_t loc)
{
char *ret;
int gmt;
FIX_LOCALE(loc);
gmt = 0;
ret = _strptime(buf, fmt, tm, &gmt, loc);
if (ret && gmt) {
time_t t = timegm(tm);
localtime_r(&t, tm);
}
return (ret);
}
char *
strptime(const char * __restrict buf, const char * __restrict fmt,
struct tm * __restrict tm)
{
return strptime_l(buf, fmt, tm, __get_locale());
}