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fix strftime field widths with %F format and zero year

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the code to strip initial sign and leading zeros inadvertently
stripped all the zeros and the subsequent '-' separating the month.
instead, only strip sign characters from the very first position, and
only strip zeros when they are followed by another digit.

based on testing by Dennis Wölfing.
This commit is contained in:
Rich Felker 2018-02-05 13:36:04 -05:00
parent cc7c300d1a
commit 596207aa38
1 changed files with 2 additions and 1 deletions
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3
src/time/strftime.c
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@ -251,7 +251,8 @@ size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const st
t = __strftime_fmt_1(&buf, &k, *f, tm, loc, pad);
if (!t) break;
if (width) {
for (; *t=='+' || *t=='-' || (*t=='0'&&t[1]); t++, k--);
if (*t=='+' || *t=='-') t++, k--;
for (; *t=='0' && t[1]-'0'<10U; t++, k--);
width--;
if (plus && tm->tm_year >= 10000-1900)
s[l++] = '+';