#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: strptime.c,v 1.18 1999/04/29 02:58:30 tv Exp $");
#endif
#include <ctype.h>
#include <string.h>
#include <time.h>
#undef _ctloc
#define _ctloc(x) _CurrentTimeLocale->x
#define ALT_E 0x01
#define ALT_O 0x02
#define LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); }
static int conv_num __P((const char **, int *, int, int));
static char *
strptime(buf, fmt, tm)
const char *buf, *fmt;
struct tm *tm;
{
char c;
const char *bp;
size_t len = 0;
int alt_format, i, split_year = 0;
bp = buf;
while ((c = *fmt) != '\0') {
alt_format = 0;
if (isspace(c)) {
while (isspace(*bp))
bp++;
fmt++;
continue;
}
if ((c = *fmt++) != '%')
goto literal;
again: switch (c = *fmt++) {
case '%':
literal:
if (c != *bp++)
return (0);
break;
case 'E':
LEGAL_ALT(0);
alt_format |= ALT_E;
goto again;
case 'O':
LEGAL_ALT(0);
alt_format |= ALT_O;
goto again;
case 'c':
LEGAL_ALT(ALT_E);
if (!(bp = strptime(bp, _ctloc(d_t_fmt), tm)))
return (0);
break;
case 'D':
LEGAL_ALT(0);
if (!(bp = strptime(bp, "%m/%d/%y", tm)))
return (0);
break;
case 'R':
LEGAL_ALT(0);
if (!(bp = strptime(bp, "%H:%M", tm)))
return (0);
break;
case 'r':
LEGAL_ALT(0);
if (!(bp = strptime(bp, _ctloc(t_fmt_ampm), tm)))
return (0);
break;
case 'T':
LEGAL_ALT(0);
if (!(bp = strptime(bp, "%H:%M:%S", tm)))
return (0);
break;
case 'X':
LEGAL_ALT(ALT_E);
if (!(bp = strptime(bp, _ctloc(t_fmt), tm)))
return (0);
break;
case 'x':
LEGAL_ALT(ALT_E);
if (!(bp = strptime(bp, _ctloc(d_fmt), tm)))
return (0);
break;
case 'A':
case 'a':
LEGAL_ALT(0);
for (i = 0; i < 7; i++) {
len = strlen(_ctloc(day[i]));
if (strncasecmp(_ctloc(day[i]), bp, len) == 0)
break;
len = strlen(_ctloc(abday[i]));
if (strncasecmp(_ctloc(abday[i]), bp, len) == 0)
break;
}
if (i == 7)
return (0);
tm->tm_wday = i;
bp += len;
break;
case 'B':
case 'b':
case 'h':
LEGAL_ALT(0);
for (i = 0; i < 12; i++) {
len = strlen(_ctloc(mon[i]));
if (strncasecmp(_ctloc(mon[i]), bp, len) == 0)
break;
len = strlen(_ctloc(abmon[i]));
if (strncasecmp(_ctloc(abmon[i]), bp, len) == 0)
break;
}
if (i == 12)
return (0);
tm->tm_mon = i;
bp += len;
break;
case 'C':
LEGAL_ALT(ALT_E);
if (!(conv_num(&bp, &i, 0, 99)))
return (0);
if (split_year) {
tm->tm_year = (tm->tm_year % 100) + (i * 100);
} else {
tm->tm_year = i * 100;
split_year = 1;
}
break;
case 'd':
case 'e':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &tm->tm_mday, 1, 31)))
return (0);
break;
case 'k':
LEGAL_ALT(0);
case 'H':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &tm->tm_hour, 0, 23)))
return (0);
break;
case 'l':
LEGAL_ALT(0);
case 'I':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &tm->tm_hour, 1, 12)))
return (0);
if (tm->tm_hour == 12)
tm->tm_hour = 0;
break;
case 'j':
LEGAL_ALT(0);
if (!(conv_num(&bp, &i, 1, 366)))
return (0);
tm->tm_yday = i - 1;
break;
case 'M':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &tm->tm_min, 0, 59)))
return (0);
break;
case 'm':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &i, 1, 12)))
return (0);
tm->tm_mon = i - 1;
break;
case 'p':
LEGAL_ALT(0);
if (strcasecmp(_ctloc(am_pm[0]), bp) == 0) {
if (tm->tm_hour > 11)
return (0);
bp += strlen(_ctloc(am_pm[0]));
break;
}
else if (strcasecmp(_ctloc(am_pm[1]), bp) == 0) {
if (tm->tm_hour > 11)
return (0);
tm->tm_hour += 12;
bp += strlen(_ctloc(am_pm[1]));
break;
}
return (0);
case 'S':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &tm->tm_sec, 0, 61)))
return (0);
break;
case 'U':
case 'W':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &i, 0, 53)))
return (0);
break;
case 'w':
LEGAL_ALT(ALT_O);
if (!(conv_num(&bp, &tm->tm_wday, 0, 6)))
return (0);
break;
case 'Y':
LEGAL_ALT(ALT_E);
if (!(conv_num(&bp, &i, 0, 9999)))
return (0);
tm->tm_year = i - TM_YEAR_BASE;
break;
case 'y':
LEGAL_ALT(ALT_E | ALT_O);
if (!(conv_num(&bp, &i, 0, 99)))
return (0);
if (split_year) {
tm->tm_year = ((tm->tm_year / 100) * 100) + i;
break;
}
split_year = 1;
if (i <= 68)
tm->tm_year = i + 2000 - TM_YEAR_BASE;
else
tm->tm_year = i + 1900 - TM_YEAR_BASE;
break;
case 'n':
case 't':
LEGAL_ALT(0);
while (isspace(*bp))
bp++;
break;
default:
return (0);
}
}
return ((char *)bp);
}
static int
conv_num(buf, dest, llim, ulim)
const char **buf;
int *dest;
int llim, ulim;
{
int result = 0;
int rulim = ulim;
if (**buf < '0' || **buf > '9')
return (0);
do {
result *= 10;
result += *(*buf)++ - '0';
rulim /= 10;
} while ((result * 10 <= ulim) && rulim && **buf >= '0' && **buf <= '9');
if (result < llim || result > ulim)
return (0);
*dest = result;
return (1);
}