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strptime: implement conversion specifiers adopted for next POSIX issue

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the %s conversion is added as the outcome of Austin Group tracker
issue 169 and its unspecified behavior is clarified as the outcome of
issue 1727.

the %F, %g, %G, %u, %V, %z, and %Z conversions are added as the
outcome of Austin Group tracker issue 879 for alignment with strftime
and the behaviors of %u, %z, and %Z are defined as the outcome of
issue 1727.

at this time, the conversions with unspecified effects on struct tm
are all left as parse-only no-ops. this may be changed at a later
time, particularly for %s, if there is reasonable cross-implementation
consensus outside the standards process on what the behavior should
be.
This commit is contained in:
Rich Felker 2024-05-06 18:40:23 -04:00
parent 3f9d4224d8
commit fced99e93d
1 changed files with 65 additions and 1 deletions
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66
src/time/strptime.c
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@ -59,6 +59,22 @@ char *strptime(const char *restrict s, const char *restrict f, struct tm *restri
s = strptime(s, "%m/%d/%y", tm);
if (!s) return 0;
break;
case 'F':
/* Use temp buffer to implement the odd requirement
* that entire field be width-limited but the year
* subfield not itself be limited. */
i = 0;
char tmp[20];
if (*s == '-' || *s == '+') tmp[i++] = *s++;
while (*s=='0' && isdigit(s[1])) s++;
for (; *s && i<(size_t)w && i+1<sizeof tmp; i++) {
tmp[i] = *s++;
}
tmp[i] = 0;
char *p = strptime(tmp, "%12Y-%m-%d", tm);
if (!p) return 0;
s -= tmp+i-p;
break;
case 'H':
dest = &tm->tm_hour;
min = 0;
@ -114,6 +130,13 @@ char *strptime(const char *restrict s, const char *restrict f, struct tm *restri
s = strptime(s, "%H:%M", tm);
if (!s) return 0;
break;
case 's':
/* Parse only. Effect on tm is unspecified
* and presently no effect is implemented.. */
if (*s == '-') s++;
if (!isdigit(*s)) return 0;
while (isdigit(*s)) s++;
break;
case 'S':
dest = &tm->tm_sec;
min = 0;
@ -125,11 +148,30 @@ char *strptime(const char *restrict s, const char *restrict f, struct tm *restri
break;
case 'U':
case 'W':
/* Throw away result, for now. (FIXME?) */
/* Throw away result of %U, %V, %W, %g, and %G. Effect
* is unspecified and there is no clear right choice. */
dest = &dummy;
min = 0;
range = 54;
goto numeric_range;
case 'V':
dest = &dummy;
min = 1;
range = 53;
goto numeric_range;
case 'g':
dest = &dummy;
w = 2;
goto numeric_digits;
case 'G':
dest = &dummy;
if (w<0) w=4;
goto numeric_digits;
case 'u':
dest = &tm->tm_wday;
min = 1;
range = 7;
goto numeric_range;
case 'w':
dest = &tm->tm_wday;
min = 0;
@ -154,6 +196,28 @@ char *strptime(const char *restrict s, const char *restrict f, struct tm *restri
adj = 1900;
want_century = 0;
goto numeric_digits;
case 'z':
if (*s == '+') neg = 0;
else if (*s == '-') neg = 1;
else return 0;
for (i=0; i<4; i++) if (!isdigit(s[1+i])) return 0;
tm->__tm_gmtoff = (s[1]-'0')*36000+(s[2]-'0')*3600
+ (s[3]-'0')*600 + (s[4]-'0')*60;
if (neg) tm->__tm_gmtoff = -tm->__tm_gmtoff;
s += 5;
break;
case 'Z':
if (!strncmp(s, tzname[0], len = strlen(tzname[0]))) {
tm->tm_isdst = 0;
s += len;
} else if (!strncmp(s, tzname[1], len=strlen(tzname[1]))) {
tm->tm_isdst = 1;
s += len;
} else {
/* FIXME: is this supposed to be an error? */
while ((*s|32)-'a' <= 'z'-'a') s++;
}
break;
case '%':
if (*s++ != '%') return 0;
break;