newlib-cygwin/newlib/libc/time/strptime.c

478 lines
10 KiB
C

/*
* Copyright (c) 1999 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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. Neither the name of KTH nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``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 KTH OR ITS CONTRIBUTORS 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. */
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include <stdlib.h>
#include "../locale/timelocal.h"
#define _ctloc(x) (_CurrentTimeLocale->x)
static _CONST int _DAYS_BEFORE_MONTH[12] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
#define SET_MDAY 1
#define SET_MON 2
#define SET_YEAR 4
#define SET_WDAY 8
#define SET_YDAY 16
#define SET_YMD (SET_YEAR | SET_MON | SET_MDAY)
/*
* tm_year is relative this year
*/
const int tm_year_base = 1900;
/*
* Return TRUE iff `year' was a leap year.
* Needed for strptime.
*/
static int
is_leap_year (int year)
{
return (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0);
}
/* Needed for strptime. */
static int
match_string (const char *__restrict *buf, const char **strs)
{
int i = 0;
for (i = 0; strs[i] != NULL; ++i) {
int len = strlen (strs[i]);
if (strncasecmp (*buf, strs[i], len) == 0) {
*buf += len;
return i;
}
}
return -1;
}
/* Needed for strptime. */
static int
first_day (int year)
{
int ret = 4;
while (--year >= 1970)
ret = (ret + 365 + is_leap_year (year)) % 7;
return ret;
}
/*
* Set `timeptr' given `wnum' (week number [0, 53])
* Needed for strptime
*/
static void
set_week_number_sun (struct tm *timeptr, int wnum)
{
int fday = first_day (timeptr->tm_year + tm_year_base);
timeptr->tm_yday = wnum * 7 + timeptr->tm_wday - fday;
if (timeptr->tm_yday < 0) {
timeptr->tm_wday = fday;
timeptr->tm_yday = 0;
}
}
/*
* Set `timeptr' given `wnum' (week number [0, 53])
* Needed for strptime
*/
static void
set_week_number_mon (struct tm *timeptr, int wnum)
{
int fday = (first_day (timeptr->tm_year + tm_year_base) + 6) % 7;
timeptr->tm_yday = wnum * 7 + (timeptr->tm_wday + 6) % 7 - fday;
if (timeptr->tm_yday < 0) {
timeptr->tm_wday = (fday + 1) % 7;
timeptr->tm_yday = 0;
}
}
/*
* Set `timeptr' given `wnum' (week number [0, 53])
* Needed for strptime
*/
static void
set_week_number_mon4 (struct tm *timeptr, int wnum)
{
int fday = (first_day (timeptr->tm_year + tm_year_base) + 6) % 7;
int offset = 0;
if (fday < 4)
offset += 7;
timeptr->tm_yday = offset + (wnum - 1) * 7 + timeptr->tm_wday - fday;
if (timeptr->tm_yday < 0) {
timeptr->tm_wday = fday;
timeptr->tm_yday = 0;
}
}
/* strptime: roken */
//extern "C"
char *
//strptime (const char *buf, const char *format, struct tm *timeptr)
_DEFUN (strptime, (buf, format, timeptr),
_CONST char *__restrict buf _AND
_CONST char *__restrict format _AND
struct tm *__restrict timeptr)
{
char c;
int ymd = 0;
struct lc_time_T *_CurrentTimeLocale = __get_current_time_locale ();
for (; (c = *format) != '\0'; ++format) {
char *s;
int ret;
if (isspace ((unsigned char) c)) {
while (isspace ((unsigned char) *buf))
++buf;
} else if (c == '%' && format[1] != '\0') {
c = *++format;
if (c == 'E' || c == 'O')
c = *++format;
switch (c) {
case 'A' :
ret = match_string (&buf, _ctloc (weekday));
if (ret < 0)
return NULL;
timeptr->tm_wday = ret;
ymd |= SET_WDAY;
break;
case 'a' :
ret = match_string (&buf, _ctloc (wday));
if (ret < 0)
return NULL;
timeptr->tm_wday = ret;
ymd |= SET_WDAY;
break;
case 'B' :
ret = match_string (&buf, _ctloc (month));
if (ret < 0)
return NULL;
timeptr->tm_mon = ret;
ymd |= SET_MON;
break;
case 'b' :
case 'h' :
ret = match_string (&buf, _ctloc (mon));
if (ret < 0)
return NULL;
timeptr->tm_mon = ret;
ymd |= SET_MON;
break;
case 'C' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_year = (ret * 100) - tm_year_base;
buf = s;
ymd |= SET_YEAR;
break;
case 'c' : /* %a %b %e %H:%M:%S %Y */
s = strptime (buf, _ctloc (c_fmt), timeptr);
if (s == NULL)
return NULL;
buf = s;
ymd |= SET_WDAY | SET_YMD;
break;
case 'D' : /* %m/%d/%y */
s = strptime (buf, "%m/%d/%y", timeptr);
if (s == NULL)
return NULL;
buf = s;
ymd |= SET_YMD;
break;
case 'd' :
case 'e' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_mday = ret;
buf = s;
ymd |= SET_MDAY;
break;
case 'H' :
case 'k' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_hour = ret;
buf = s;
break;
case 'I' :
case 'l' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
if (ret == 12)
timeptr->tm_hour = 0;
else
timeptr->tm_hour = ret;
buf = s;
break;
case 'j' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_yday = ret - 1;
buf = s;
ymd |= SET_YDAY;
break;
case 'm' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_mon = ret - 1;
buf = s;
ymd |= SET_MON;
break;
case 'M' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_min = ret;
buf = s;
break;
case 'n' :
if (*buf == '\n')
++buf;
else
return NULL;
break;
case 'p' :
ret = match_string (&buf, _ctloc (am_pm));
if (ret < 0)
return NULL;
if (timeptr->tm_hour == 0) {
if (ret == 1)
timeptr->tm_hour = 12;
} else
timeptr->tm_hour += 12;
break;
case 'r' : /* %I:%M:%S %p */
s = strptime (buf, _ctloc (ampm_fmt), timeptr);
if (s == NULL)
return NULL;
buf = s;
break;
case 'R' : /* %H:%M */
s = strptime (buf, "%H:%M", timeptr);
if (s == NULL)
return NULL;
buf = s;
break;
case 'S' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_sec = ret;
buf = s;
break;
case 't' :
if (*buf == '\t')
++buf;
else
return NULL;
break;
case 'T' : /* %H:%M:%S */
s = strptime (buf, "%H:%M:%S", timeptr);
if (s == NULL)
return NULL;
buf = s;
break;
case 'u' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_wday = ret - 1;
buf = s;
ymd |= SET_WDAY;
break;
case 'w' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_wday = ret;
buf = s;
ymd |= SET_WDAY;
break;
case 'U' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
set_week_number_sun (timeptr, ret);
buf = s;
ymd |= SET_YDAY;
break;
case 'V' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
set_week_number_mon4 (timeptr, ret);
buf = s;
ymd |= SET_YDAY;
break;
case 'W' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
set_week_number_mon (timeptr, ret);
buf = s;
ymd |= SET_YDAY;
break;
case 'x' :
s = strptime (buf, _ctloc (x_fmt), timeptr);
if (s == NULL)
return NULL;
buf = s;
ymd |= SET_YMD;
break;
case 'X' :
s = strptime (buf, _ctloc (X_fmt), timeptr);
if (s == NULL)
return NULL;
buf = s;
break;
case 'y' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
if (ret < 70)
timeptr->tm_year = 100 + ret;
else
timeptr->tm_year = ret;
buf = s;
ymd |= SET_YEAR;
break;
case 'Y' :
ret = strtol (buf, &s, 10);
if (s == buf)
return NULL;
timeptr->tm_year = ret - tm_year_base;
buf = s;
ymd |= SET_YEAR;
break;
case 'Z' :
/* Unsupported. Just ignore. */
break;
case '\0' :
--format;
/* FALLTHROUGH */
case '%' :
if (*buf == '%')
++buf;
else
return NULL;
break;
default :
if (*buf == '%' || *++buf == c)
++buf;
else
return NULL;
break;
}
} else {
if (*buf == c)
++buf;
else
return NULL;
}
}
if ((ymd & SET_YMD) == SET_YMD) {
/* all of tm_year, tm_mon and tm_mday, but... */
if (!(ymd & SET_YDAY)) {
/* ...not tm_yday, so fill it in */
timeptr->tm_yday = _DAYS_BEFORE_MONTH[timeptr->tm_mon]
+ timeptr->tm_mday;
if (!is_leap_year (timeptr->tm_year + tm_year_base)
|| timeptr->tm_mon < 2)
{
timeptr->tm_yday--;
}
ymd |= SET_YDAY;
}
}
else if ((ymd & (SET_YEAR | SET_YDAY)) == (SET_YEAR | SET_YDAY)) {
/* both of tm_year and tm_yday, but... */
if (!(ymd & SET_MON)) {
/* ...not tm_mon, so fill it in, and/or... */
if (timeptr->tm_yday < _DAYS_BEFORE_MONTH[1])
timeptr->tm_mon = 0;
else {
int leap = is_leap_year (timeptr->tm_year + tm_year_base);
int i;
for (i = 2; i < 12; ++i) {
if (timeptr->tm_yday < _DAYS_BEFORE_MONTH[i] + leap)
break;
}
timeptr->tm_mon = i - 1;
}
}
if (!(ymd & SET_MDAY)) {
/* ...not tm_mday, so fill it in */
timeptr->tm_mday = timeptr->tm_yday
- _DAYS_BEFORE_MONTH[timeptr->tm_mon];
if (!is_leap_year (timeptr->tm_year + tm_year_base)
|| timeptr->tm_mon < 2)
{
timeptr->tm_mday++;
}
}
}
if ((ymd & (SET_YEAR | SET_YDAY | SET_WDAY)) == (SET_YEAR | SET_YDAY)) {
/* fill in tm_wday */
int fday = first_day (timeptr->tm_year + tm_year_base);
timeptr->tm_wday = (fday + timeptr->tm_yday) % 7;
}
return (char *)buf;
}