Fixing strncat

grumpycoders · Jul 15, 2020 · 6718594 · 6718594
1 parent af8c834
commit 6718594
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/libc/include/string.h b/libc/include/string.h
@@ -96,10 +96,15 @@ static __inline__ size_t strlen(const char * s) {
 
 static __inline__ char * strncat(char * s1, const char * s2, size_t n) {
     char * r = s1;
+    char c;
 
     while (*s1)
         s1++;
-    strncpy(s1, s2, n);
+
+    while (n-- && ((c = *s2++)))
+        *s1++ = c;
+
+    *s1 = 0;
 
     return r;
 }