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strftime cleanup: avoid recomputing strlen when it's known

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This commit is contained in:
Rich Felker 2013-08-22 19:36:30 -04:00
parent 45849d3dcb
commit 87e133b352
1 changed files with 16 additions and 10 deletions
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26
src/time/strftime.c
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@ -46,12 +46,11 @@ static int week_num(const struct tm *tm)
size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
const char *__strftime_fmt_1(char (*s)[100], int f, const struct tm *tm, locale_t loc)
const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc)
{
nl_item item;
int val;
const char *fmt;
size_t l;
switch (f) {
case 'a':
@ -122,6 +121,7 @@ const char *__strftime_fmt_1(char (*s)[100], int f, const struct tm *tm, locale_
fmt = "%02d";
goto number;
case 'n':
*l = 1;
return "\n";
case 'p':
item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
@ -137,6 +137,7 @@ const char *__strftime_fmt_1(char (*s)[100], int f, const struct tm *tm, locale_
fmt = "%02d";
goto number;
case 't':
*l = 1;
return "\t";
case 'T':
fmt = "%H:%M:%S";
@ -177,25 +178,30 @@ const char *__strftime_fmt_1(char (*s)[100], int f, const struct tm *tm, locale_
goto number;
case 'z':
val = -tm->__tm_gmtoff;
snprintf(*s, sizeof *s, "%+.2d%.2d", val/3600, abs(val%3600)/60);
*l = snprintf(*s, sizeof *s, "%+.2d%.2d", val/3600, abs(val%3600)/60);
return *s;
case 'Z':
return tm->__tm_zone;
fmt = tm->__tm_zone;
goto string;
case '%':
*l = 1;
return "%";
default:
return 0;
}
number:
snprintf(*s, sizeof *s, fmt, val);
*l = snprintf(*s, sizeof *s, fmt, val);
return *s;
nl_strcat:
return __nl_langinfo_l(item, loc);
fmt = __nl_langinfo_l(item, loc);
string:
*l = strlen(fmt);
return fmt;
nl_strftime:
fmt = __nl_langinfo_l(item, loc);
recu_strftime:
l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
if (!l) return 0;
*l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
if (!*l) return 0;
return *s;
}
@ -215,8 +221,8 @@ size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const st
}
f++;
if (*f == 'E' || *f == 'O') f++;
t = __strftime_fmt_1(&buf, *f, tm, loc);
if (!t || (k = strlen(t)) >= n-l)
t = __strftime_fmt_1(&buf, &k, *f, tm, loc);
if (!t || k >= n-l)
return 0;
memcpy(s+l, t, k);
l += k;