implement memrchr (nonstandard) and optimize strrchr in terms of it

[musl] / src / string / memrchr.c

diff --git a/src/string/memrchr.c b/src/string/memrchr.c
new file mode 100644 (file)
index 0000000..a78e9d6
--- /dev/null
+++ b/src/string/memrchr.c
@@ -0,0 +1,12 @@
+#include <string.h>
+#include "libc.h"
+
+void *__memrchr(const void *m, int c, size_t n)
+{
+       const unsigned char *s = m;
+       c = (unsigned char)c;
+       while (n--) if (s[n]==c) return (void *)(s+n);
+       return 0;
+}
+
+weak_alias(__memrchr, memrchr);