static char *
_strptime(const char *buf, const char *fmt, struct tm *tm, int initialize)
{
unsigned char c;
const unsigned char *bp, *ep;
size_t len;
int alt_format, i, offs;
int neg = 0;
static int century, relyear;
if (initialize) {
century = TM_YEAR_BASE;
relyear = -1;
}
bp = (unsigned char *)buf;
while ((c = *fmt) != '\0') {
/* Clear `alternate' modifier prior to new conversion. */
alt_format = 0;
/* Eat up white-space. */
if (isspace(c)) {
while (isspace(*bp))
bp++;
fmt++;
continue;
}
if ((c = *fmt++) != '%')
goto literal;
again: switch (c = *fmt++) {
case '%': /* "%%" is converted to "%". */
literal:
if (c != *bp++)
return (NULL);
break;
/*
* "Alternative" modifiers. Just set the appropriate flag
* and start over again.
*/
case 'E': /* "%E?" alternative conversion modifier. */
_LEGAL_ALT(0);
alt_format |= _ALT_E;
goto again;
case 'O': /* "%O?" alternative conversion modifier. */
_LEGAL_ALT(0);
alt_format |= _ALT_O;
goto again;
/*
* "Complex" conversion rules, implemented through recursion.
*/
case 'c': /* Date and time, using the locale's format. */
_LEGAL_ALT(_ALT_E);
if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, 0)))
return (NULL);
break;
case 'D': /* The date as "%m/%d/%y". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%m/%d/%y", tm, 0)))
return (NULL);
break;
case 'F': /* The date as "%Y-%m-%d". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%Y-%m-%d", tm, 0)))
return (NULL);
continue;
case 'R': /* The time as "%H:%M". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%H:%M", tm, 0)))
return (NULL);
break;
case 'r': /* The time as "%I:%M:%S %p". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, 0)))
return (NULL);
break;
case 'T': /* The time as "%H:%M:%S". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%H:%M:%S", tm, 0)))
return (NULL);
break;
case 'X': /* The time, using the locale's format. */
_LEGAL_ALT(_ALT_E);
if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, 0)))
return (NULL);
break;
case 'x': /* The date, using the locale's format. */
_LEGAL_ALT(_ALT_E);
if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, 0)))
return (NULL);
break;
/*
* "Elementary" conversion rules.
*/
case 'A': /* The day of week, using the locale's form. */
case 'a':
_LEGAL_ALT(0);
for (i = 0; i < 7; i++) {
/* Full name. */
len = strlen(_ctloc(day[i]));
if (strncasecmp(_ctloc(day[i]), bp, len) == 0)
break;
/* Abbreviated name. */
len = strlen(_ctloc(abday[i]));
if (strncasecmp(_ctloc(abday[i]), bp, len) == 0)
break;
}
/* Nothing matched. */
if (i == 7)
return (NULL);
tm->tm_wday = i;
bp += len;
break;
case 'B': /* The month, using the locale's form. */
case 'b':
case 'h':
_LEGAL_ALT(0);
for (i = 0; i < 12; i++) {
/* Full name. */
len = strlen(_ctloc(mon[i]));
if (strncasecmp(_ctloc(mon[i]), bp, len) == 0)
break;
/* Abbreviated name. */
len = strlen(_ctloc(abmon[i]));
if (strncasecmp(_ctloc(abmon[i]), bp, len) == 0)
break;
}
/* Nothing matched. */
if (i == 12)
return (NULL);
tm->tm_mon = i;
bp += len;
break;
case 'C': /* The century number. */
_LEGAL_ALT(_ALT_E);
if (!(_conv_num(&bp, &i, 0, 99)))
return (NULL);
century = i * 100;
break;
case 'd': /* The day of month. */
case 'e':
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_mday, 1, 31)))
return (NULL);
break;
case 'k': /* The hour (24-hour clock representation). */
_LEGAL_ALT(0);
/* FALLTHROUGH */
case 'H':
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_hour, 0, 23)))
return (NULL);
break;
case 'l': /* The hour (12-hour clock representation). */
_LEGAL_ALT(0);
/* FALLTHROUGH */
case 'I':
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_hour, 1, 12)))
return (NULL);
break;
case 'j': /* The day of year. */
_LEGAL_ALT(0);
if (!(_conv_num(&bp, &tm->tm_yday, 1, 366)))
return (NULL);
tm->tm_yday--;
break;
case 'M': /* The minute. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_min, 0, 59)))
return (NULL);
break;
case 'm': /* The month. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_mon, 1, 12)))
return (NULL);
tm->tm_mon--;
break;
case 'p': /* The locale's equivalent of AM/PM. */
_LEGAL_ALT(0);
/* AM? */
len = strlen(_ctloc(am_pm[0]));
if (strncasecmp(_ctloc(am_pm[0]), bp, len) == 0) {
if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */
return (NULL);
else if (tm->tm_hour == 12)
tm->tm_hour = 0;
bp += len;
break;
}
/* PM? */
len = strlen(_ctloc(am_pm[1]));
if (strncasecmp(_ctloc(am_pm[1]), bp, len) == 0) {
if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */
return (NULL);
else if (tm->tm_hour < 12)
tm->tm_hour += 12;
bp += len;
break;
}
/* Nothing matched. */
return (NULL);
case 'S': /* The seconds. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_sec, 0, 61)))
return (NULL);
break;
case 'U': /* The week of year, beginning on sunday. */
case 'W': /* The week of year, beginning on monday. */
_LEGAL_ALT(_ALT_O);
/*
* 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 (!(_conv_num(&bp, &i, 0, 53)))
return (NULL);
break;
case 'w': /* The day of week, beginning on sunday. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_wday, 0, 6)))
return (NULL);
break;
case 'u': /* The day of week, monday = 1. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &i, 1, 7)))
return (NULL);
tm->tm_wday = i % 7;
continue;
case 'g': /* The year corresponding to the ISO week
* number but without the century.
*/
if (!(_conv_num(&bp, &i, 0, 99)))
return (NULL);
continue;
case 'G': /* The year corresponding to the ISO week
* number with century.
*/
do
bp++;
while (isdigit(*bp));
continue;
case 'V': /* The ISO 8601:1988 week number as decimal */
if (!(_conv_num(&bp, &i, 0, 53)))
return (NULL);
continue;
case 'Y': /* The year. */
_LEGAL_ALT(_ALT_E);
if (!(_conv_num(&bp, &i, 0, 9999)))
return (NULL);
relyear = -1;
tm->tm_year = i - TM_YEAR_BASE;
break;
case 'y': /* The year within the century (2 digits). */
_LEGAL_ALT(_ALT_E | _ALT_O);
if (!(_conv_num(&bp, &relyear, 0, 99)))
return (NULL);
break;
case 'Z':
tzset();
if (strncmp((const char *)bp, gmt, 3) == 0) {
tm->tm_isdst = 0;
#ifdef TM_GMTOFF
tm->TM_GMTOFF = 0;
#endif
#ifdef TM_ZONE
tm->TM_ZONE = gmt;
#endif
bp += 3;
} else {
ep = _find_string(bp, &i,
(const char * const *)tzname,
NULL, 2);
if (ep != NULL) {
tm->tm_isdst = i;
#ifdef TM_GMTOFF
tm->TM_GMTOFF = -(timezone);
#endif
#ifdef TM_ZONE
tm->TM_ZONE = tzname[i];
#endif
}
bp = ep;
}
continue;
case 'z':
/*
* We recognize all ISO 8601 formats:
* Z = Zulu time/UTC
* [+-]hhmm
* [+-]hh:mm
* [+-]hh
* We recognize all RFC-822/RFC-2822 formats:
* UT|GMT
* North American : UTC offsets
* E[DS]T = Eastern : -4 | -5
* C[DS]T = Central : -5 | -6
* M[DS]T = Mountain: -6 | -7
* P[DS]T = Pacific : -7 | -8
* Military
* [A-IL-M] = -1 ... -9 (J not used)
* [N-Y] = +1 ... +12
*/
while (isspace(*bp))
bp++;
switch (*bp++) {
case 'G':
if (*bp++ != 'M')
return NULL;
/*FALLTHROUGH*/
case 'U':
if (*bp++ != 'T')
return NULL;
/*FALLTHROUGH*/
case 'Z':
tm->tm_isdst = 0;
#ifdef TM_GMTOFF
tm->TM_GMTOFF = 0;
#endif
#ifdef TM_ZONE
tm->TM_ZONE = utc;
#endif
continue;
case '+':
neg = 0;
break;
case '-':
neg = 1;
break;
default:
--bp;
ep = _find_string(bp, &i, nast, NULL, 4);
if (ep != NULL) {
#ifdef TM_GMTOFF
tm->TM_GMTOFF = -5 - i;
#endif
#ifdef TM_ZONE
tm->TM_ZONE = __UNCONST(nast[i]);
#endif
bp = ep;
continue;
}
ep = _find_string(bp, &i, nadt, NULL, 4);
if (ep != NULL) {
tm->tm_isdst = 1;
#ifdef TM_GMTOFF
tm->TM_GMTOFF = -4 - i;
#endif
#ifdef TM_ZONE
tm->TM_ZONE = __UNCONST(nadt[i]);
#endif
bp = ep;
continue;
}
if ((*bp >= 'A' && *bp <= 'I') ||
(*bp >= 'L' && *bp <= 'Y')) {
#ifdef TM_GMTOFF
/* Argh! No 'J'! */
if (*bp >= 'A' && *bp <= 'I')
tm->TM_GMTOFF =
('A' - 1) - (int)*bp;
else if (*bp >= 'L' && *bp <= 'M')
tm->TM_GMTOFF = 'A' - (int)*bp;
else if (*bp >= 'N' && *bp <= 'Y')
tm->TM_GMTOFF = (int)*bp - 'M';
#endif
#ifdef TM_ZONE
tm->TM_ZONE = NULL; /* XXX */
#endif
bp++;
continue;
}
return NULL;
}
offs = 0;
for (i = 0; i < 4; ) {
if (isdigit(*bp)) {
offs = offs * 10 + (*bp++ - '0');
i++;
continue;
}
if (i == 2 && *bp == ':') {
bp++;
continue;
}
break;
}
switch (i) {
case 2:
offs *= 100;
break;
case 4:
i = offs % 100;
if (i >= 60)
return NULL;
/* Convert minutes into decimal */
offs = (offs / 100) * 100 + (i * 50) / 30;
break;
default:
return NULL;
}
if (neg)
offs = -offs;
tm->tm_isdst = 0; /* XXX */
#ifdef TM_GMTOFF
tm->TM_GMTOFF = offs;
#endif
#ifdef TM_ZONE
tm->TM_ZONE = NULL; /* XXX */
#endif
continue;
/*
* Miscellaneous conversions.
*/
case 'n': /* Any kind of white-space. */
case 't':
_LEGAL_ALT(0);
while (isspace(*bp))
bp++;
break;
default: /* Unknown/unsupported conversion. */
return (NULL);
}
}
/*
* We need to evaluate the two digit year spec (%y)
* last as we can get a century spec (%C) at any time.
*/
if (relyear != -1) {
if (century == TM_YEAR_BASE) {
if (relyear <= 68)
tm->tm_year = relyear + 2000 - TM_YEAR_BASE;
else
tm->tm_year = relyear + 1900 - TM_YEAR_BASE;
} else {
tm->tm_year = relyear + century - TM_YEAR_BASE;
}
}
return ((char *)bp);
}
static unsigned char *
_strptime(const unsigned char *buf, const char *fmt, struct tm *tm, struct century_relyear *cr)
{
unsigned char c;
const unsigned char *bp;
size_t len = 0;
int alt_format, i;
bp = (unsigned char *)buf;
while ((c = *fmt) != '\0') {
/* Clear `alternate' modifier prior to new conversion. */
alt_format = 0;
/* Eat up white-space. */
if (isspace(c)) {
while (isspace(*bp))
bp++;
fmt++;
continue;
}
if ((c = *fmt++) != '%')
goto literal;
again: switch (c = *fmt++) {
case '%': /* "%%" is converted to "%". */
literal:
if (c != *bp++)
return (NULL);
break;
/*
* "Alternative" modifiers. Just set the appropriate flag
* and start over again.
*/
case 'E': /* "%E?" alternative conversion modifier. */
_LEGAL_ALT(0);
alt_format |= _ALT_E;
goto again;
case 'O': /* "%O?" alternative conversion modifier. */
_LEGAL_ALT(0);
alt_format |= _ALT_O;
goto again;
/*
* "Complex" conversion rules, implemented through recursion.
*/
case 'c': /* Date and time, using the locale's format. */
_LEGAL_ALT(_ALT_E);
if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, cr)))
return (NULL);
break;
case 'D': /* The date as "%m/%d/%y". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%m/%d/%y", tm, cr)))
return (NULL);
break;
case 'R': /* The time as "%H:%M". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%H:%M", tm, cr)))
return (NULL);
break;
case 'r': /* The time as "%I:%M:%S %p". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, cr)))
return (NULL);
break;
case 'T': /* The time as "%H:%M:%S". */
_LEGAL_ALT(0);
if (!(bp = _strptime(bp, "%H:%M:%S", tm, cr)))
return (NULL);
break;
case 'X': /* The time, using the locale's format. */
_LEGAL_ALT(_ALT_E);
if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, cr)))
return (NULL);
break;
case 'x': /* The date, using the locale's format. */
_LEGAL_ALT(_ALT_E);
if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, cr)))
return (NULL);
break;
/*
* "Elementary" conversion rules.
*/
case 'A': /* The day of week, using the locale's form. */
case 'a':
_LEGAL_ALT(0);
for (i = 0; i < 7; i++) {
/* Full name. */
len = strlen(_ctloc(day[i]));
if (strncasecmp(_ctloc(day[i]), (const char*)bp, len) == 0)
break;
/* Abbreviated name. */
len = strlen(_ctloc(abday[i]));
if (strncasecmp(_ctloc(abday[i]), (const char*)bp, len) == 0)
break;
}
/* Nothing matched. */
if (i == 7)
return (NULL);
tm->tm_wday = i;
bp += len;
break;
case 'B': /* The month, using the locale's form. */
case 'b':
case 'h':
_LEGAL_ALT(0);
for (i = 0; i < 12; i++) {
/* Full name. */
len = strlen(_ctloc(mon[i]));
if (strncasecmp(_ctloc(mon[i]), (const char*)bp, len) == 0)
break;
/* Abbreviated name. */
len = strlen(_ctloc(abmon[i]));
if (strncasecmp(_ctloc(abmon[i]), (const char*)bp, len) == 0)
break;
}
/* Nothing matched. */
if (i == 12)
return (NULL);
tm->tm_mon = i;
bp += len;
break;
case 'C': /* The century number. */
_LEGAL_ALT(_ALT_E);
if (!(_conv_num(&bp, &i, 0, 99)))
return (NULL);
cr->century = i * 100;
break;
case 'd': /* The day of month. */
case 'e':
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_mday, 1, 31)))
return (NULL);
break;
case 'k': /* The hour (24-hour clock representation). */
_LEGAL_ALT(0);
/* FALLTHROUGH */
case 'H':
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_hour, 0, 23)))
return (NULL);
break;
case 'l': /* The hour (12-hour clock representation). */
_LEGAL_ALT(0);
/* FALLTHROUGH */
case 'I':
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_hour, 1, 12)))
return (NULL);
break;
case 'j': /* The day of year. */
_LEGAL_ALT(0);
if (!(_conv_num(&bp, &tm->tm_yday, 1, 366)))
return (NULL);
tm->tm_yday--;
break;
case 'M': /* The minute. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_min, 0, 59)))
return (NULL);
break;
case 'm': /* The month. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_mon, 1, 12)))
return (NULL);
tm->tm_mon--;
break;
case 'p': /* The locale's equivalent of AM/PM. */
_LEGAL_ALT(0);
/* AM? */
len = strlen(_ctloc(am_pm[0]));
if (strncasecmp(_ctloc(am_pm[0]), (const char*)bp, len) == 0) {
if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */
return (NULL);
else if (tm->tm_hour == 12)
tm->tm_hour = 0;
bp += len;
break;
}
/* PM? */
len = strlen(_ctloc(am_pm[1]));
if (strncasecmp(_ctloc(am_pm[1]), (const char*)bp, len) == 0) {
if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */
return (NULL);
else if (tm->tm_hour < 12)
tm->tm_hour += 12;
bp += len;
break;
}
/* Nothing matched. */
return (NULL);
case 'S': /* The seconds. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_sec, 0, 61)))
return (NULL);
break;
case 'U': /* The week of year, beginning on sunday. */
case 'W': /* The week of year, beginning on monday. */
_LEGAL_ALT(_ALT_O);
/*
* 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 (!(_conv_num(&bp, &i, 0, 53)))
return (NULL);
break;
case 'w': /* The day of week, beginning on sunday. */
_LEGAL_ALT(_ALT_O);
if (!(_conv_num(&bp, &tm->tm_wday, 0, 6)))
return (NULL);
break;
case 'Y': /* The year. */
_LEGAL_ALT(_ALT_E);
if (!(_conv_num(&bp, &i, 0, 9999)))
return (NULL);
cr->relyear = -1;
tm->tm_year = i - TM_YEAR_BASE;
break;
case 'y': /* The year within the century (2 digits). */
_LEGAL_ALT(_ALT_E | _ALT_O);
if (!(_conv_num(&bp, &cr->relyear, 0, 99)))
return (NULL);
break;
/*
* Miscellaneous conversions.
*/
case 'n': /* Any kind of white-space. */
case 't':
_LEGAL_ALT(0);
while (isspace(*bp))
bp++;
break;
default: /* Unknown/unsupported conversion. */
return (NULL);
}
}
/*
* We need to evaluate the two digit year spec (%y)
* last as we can get a century spec (%C) at any time.
*/
if (cr->relyear != -1) {
if (cr->century == TM_YEAR_BASE) {
if (cr->relyear <= 68)
tm->tm_year = cr->relyear + 2000 - TM_YEAR_BASE;
else
tm->tm_year = cr->relyear + 1900 - TM_YEAR_BASE;
} else {
tm->tm_year = cr->relyear + cr->century - TM_YEAR_BASE;
}
}
return (unsigned char*)bp;
}
