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fix printf %ls with precision limit over-read issue 

printf was not printing too many characters, but it was reading one
too many wchar_t elements from the input. this could lead to crashes
if running off the page, or spurious failure if the conversion of the
extra wchar_t resulted in EILSEQ.
This commit is contained in:
Rich Felker 2012-06-08 10:32:59 -04:00
parent 1429ce9ba2
commit 6e9ff6a4cf
1 changed files with 2 additions and 2 deletions
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4
src/stdio/vfprintf.c
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@ -599,12 +599,12 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
p = -1;
case 'S':
ws = arg.p;
for (i=0; *ws && (l=wctomb(mb, *ws++))>=0 && l<=0U+p-i; i+=l);
for (i=l=0; i<p && *ws && (l=wctomb(mb, *ws++))>=0 && l<=0U+p-i; i+=l);
if (l<0) return -1;
p = i;
pad(f, ' ', w, p, fl);
ws = arg.p;
for (i=0; *ws && i+(l=wctomb(mb, *ws++))<=p; i+=l)
for (i=0; i<p && *ws && i+(l=wctomb(mb, *ws++))<=p; i+=l)
out(f, mb, l);
pad(f, ' ', w, p, fl^LEFT_ADJ);
l = w>p ? w : p;