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byte-based printf family: emit a nul byte for %lc with argument zero 

this is contrary to the spec as written, which requires %lc to behave
as if it were %ls on a 2-wchar_t buffer containing the argument and
zero. however, apparently no other implementations conform to the spec
as written, and in response to Austin Group issue #1647, WG14 chose to
align with existing practice and have %lc produce output for this case.
This commit is contained in:
Rich Felker 2023-11-06 13:59:06 -05:00
parent 8c086e7674
commit 7b6a6516e1
1 changed files with 2 additions and 0 deletions
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2
src/stdio/vfprintf.c
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@ -588,6 +588,7 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
}
p = MAX(p, z-a + !arg.i);
break;
narrow_c:
case 'c':
*(a=z-(p=1))=arg.i;
fl &= ~ZERO_PAD;
@ -602,6 +603,7 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
fl &= ~ZERO_PAD;
break;
case 'C':
if (!arg.i) goto narrow_c;
wc[0] = arg.i;
wc[1] = 0;
arg.p = wc;