libbb: code shrink in last_char_is()
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/last_char_is.c b/libbb/last_char_is.c
index 66f2e36..918526e 100644
--- a/libbb/last_char_is.c
+++ b/libbb/last_char_is.c
@@ -8,16 +8,17 @@
*/
#include "libbb.h"
-/* Find out if the last character of a string matches the one given.
- * Don't underrun the buffer if the string length is 0.
- */
+/* Find out if the last character of a string matches the one given */
char* FAST_FUNC last_char_is(const char *s, int c)
{
- if (s && *s) {
- size_t sz = strlen(s) - 1;
- s += sz;
- if ( (unsigned char)*s == c)
- return (char*)s;
+ if (s) {
+ size_t sz = strlen(s);
+ /* Don't underrun the buffer if the string length is 0 */
+ if (sz != 0) {
+ s += sz - 1;
+ if ((unsigned char)*s == c)
+ return (char*)s;
+ }
}
return NULL;
}