diff options
Diffstat (limited to 'debug/snprintf_chk.c')
| -rw-r--r-- | debug/snprintf_chk.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/debug/snprintf_chk.c b/debug/snprintf_chk.c index cddba37109..984b5e8932 100644 --- a/debug/snprintf_chk.c +++ b/debug/snprintf_chk.c @@ -15,25 +15,29 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#include <libioP.h> #include <stdarg.h> -#include <stdio.h> +#include <libio/libioP.h> /* Write formatted output into S, according to the format string FORMAT, writing no more than MAXLEN characters. */ -/* VARARGS5 */ int -___snprintf_chk (char *s, size_t maxlen, int flags, size_t slen, +___snprintf_chk (char *s, size_t maxlen, int flag, size_t slen, const char *format, ...) { - va_list arg; - int done; + if (__glibc_unlikely (slen < maxlen)) + __chk_fail (); - va_start (arg, format); - done = __vsnprintf_chk (s, maxlen, flags, slen, format, arg); - va_end (arg); + /* For flag > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n + can only come from read-only format strings. */ + unsigned int mode = (flag > 0) ? PRINTF_FORTIFY : 0; + va_list ap; + int ret; - return done; + va_start (ap, format); + ret = __vsnprintf_internal (s, maxlen, format, ap, mode); + va_end (ap); + + return ret; } ldbl_strong_alias (___snprintf_chk, __snprintf_chk) |