1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/builtins/lib/strncat.c b/gcc/testsuite/gcc.c-torture/execute/builtins/lib/strncat.c
new file mode 100644
index 000000000..7fd334cb4
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/builtins/lib/strncat.c
@@ -0,0 +1,29 @@
+extern void abort(void);
+extern int inside_main;
+
+typedef __SIZE_TYPE__ size_t;
+
+__attribute__ ((__noinline__))
+char *
+strncat (char *s1, const char *s2, size_t n)
+{
+  char *dest = s1;
+  char c = '\0';
+#ifdef __OPTIMIZE__
+  if (inside_main)
+    abort();
+#endif
+  while (*s1) s1++;
+  c = '\0';
+  while (n > 0)
+    {
+      c = *s2++;
+      *s1++ = c;
+      if (c == '\0')
+	return dest;
+      n--;
+    }
+  if (c != '\0')
+    *s1 = '\0';
+  return dest;
+}