fix memccpy to not access buffer past given size

memccpy would return a pointer over the given size when c is not
found in the source buffer and n reaches 0.

diff --git a/src/string/memccpy.c b/src/string/memccpy.c
index f515581..00c18e2 100644 (file)
--- a/src/string/memccpy.c
+++ b/src/string/memccpy.c
@@ -29,6 +29,6 @@ void *memccpy(void *restrict dest, const void *restrict src, int c, size_t n)
 #endif
        for (; n && (*d=*s)!=c; n--, s++, d++);
 tail:
-       if (*s==c) return d+1;
+       if (n && *s==c) return d+1;
        return 0;
 }