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fix printf regression with alt-form octal, zero flag, and field width 

commit b91cdbe2bc, in fixing another
issue, changed the logic for how alt-form octal adds the leading zero
to adjust the precision rather than using a prefix character. this
wrongly suppressed the zero flag by mimicing an explicit precision
given by the format string. switch back to using a prefix character.

based on bug report and patch by Dmitry V. Levin, but simplified.
This commit is contained in:
Rich Felker 2016-09-16 17:40:08 -04:00
parent e738b8cbe6
commit 78897b0dc0
1 changed files with 1 additions and 1 deletions
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2
src/stdio/vfprintf.c
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@ -570,7 +570,7 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
if (0) {
case 'o':
a = fmt_o(arg.i, z);
if ((fl&ALT_FORM) && p<z-a+1) p=z-a+1;
if ((fl&ALT_FORM) && p<z-a+1) prefix+=5, pl=1;
} if (0) {
case 'd': case 'i':
pl=1;