diff options
Diffstat (limited to 'stdio-common')
| -rw-r--r-- | stdio-common/vfprintf.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/stdio-common/vfprintf.c b/stdio-common/vfprintf.c index 23981d18cd..1682b0b6ce 100644 --- a/stdio-common/vfprintf.c +++ b/stdio-common/vfprintf.c @@ -1142,9 +1142,34 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap) else if (!is_long && spec != L_('S')) \ { \ if (prec != -1) \ - /* Search for the end of the string, but don't search past \ - the length specified by the precision. */ \ - len = __strnlen (string, prec); \ + { \ + /* Search for the end of the string, but don't search past \ + the length (in bytes) specified by the precision. Also \ + don't use incomplete characters. */ \ + if (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_MB_CUR_MAX) == 1) \ + len = __strnlen (string, prec); \ + else \ + { \ + /* In case we have a multibyte character set the \ + situation is more compilcated. We must not copy \ + bytes at the end which form an incomplete character. */\ + wchar_t ignore[prec]; \ + const char *str2 = string; \ + mbstate_t ps; \ + \ + memset (&ps, '\0', sizeof (ps)); \ + if (__mbsnrtowcs (ignore, &str2, prec, prec, &ps) \ + == (size_t) -1) \ + { \ + done = -1; \ + goto all_done; \ + } \ + if (str2 == NULL) \ + len = strlen (string); \ + else \ + len = str2 - string - (ps.__count); \ + } \ + } \ else \ len = strlen (string); \ } \ |