1 files changed, 82 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/builtins/strncat.c b/gcc/testsuite/gcc.c-torture/execute/builtins/strncat.c
new file mode 100644
index 000000000..1a093baf7
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/builtins/strncat.c
@@ -0,0 +1,82 @@
+/* Copyright (C) 2000, 2003  Free Software Foundation.
+
+   Ensure all expected transformations of builtin strncat occur and
+   perform correctly.
+
+   Written by Kaveh R. Ghazi, 11/27/2000.  */
+
+extern void abort (void);
+typedef __SIZE_TYPE__ size_t;
+extern char *strncat (char *, const char *, size_t);
+extern char *strcpy (char *, const char *);
+extern void *memset (void *, int, size_t);
+extern int memcmp (const void *, const void *, size_t);
+int x = 123;
+
+/* Reset the destination buffer to a known state. */
+#define RESET_DST_WITH(FILLER) \
+  do { memset (dst, 'X', sizeof (dst)); strcpy (dst, (FILLER)); } while (0)
+
+void
+main_test (void)
+{
+  const char *const s1 = "hello world";
+  const char *const s2 = "";
+  char dst[64], *d2;
+  
+  RESET_DST_WITH (s1);
+  if (strncat (dst, "", 100) != dst || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+  RESET_DST_WITH (s1);
+  if (strncat (dst, s2, 100) != dst || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2, s2, 100) != dst+1 || d2 != dst+1
+      || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2+5, s2, 100) != dst+6 || d2 != dst+1
+      || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2+5, s1+11, 100) != dst+6 || d2 != dst+1
+      || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2+5, s1, 0) != dst+6 || d2 != dst+1
+      || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2+5, "", ++x) != dst+6 || d2 != dst+1 || x != 124
+      || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+
+  RESET_DST_WITH (s1);
+  if (strncat (dst, "foo", 3) != dst || memcmp (dst, "hello worldfoo\0XXX", 18))
+    abort();
+  RESET_DST_WITH (s1);
+  if (strncat (dst, "foo", 100) != dst || memcmp (dst, "hello worldfoo\0XXX", 18))
+    abort();
+  RESET_DST_WITH (s1);
+  if (strncat (dst, s1, 100) != dst || memcmp (dst, "hello worldhello world\0XXX", 26))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2, s1, 100) != dst+1 || d2 != dst+1
+      || memcmp (dst, "hello worldhello world\0XXX", 26))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2+5, s1, 100) != dst+6 || d2 != dst+1
+      || memcmp (dst, "hello worldhello world\0XXX", 26))
+    abort();
+  RESET_DST_WITH (s1); d2 = dst;
+  if (strncat (++d2+5, s1+5, 100) != dst+6 || d2 != dst+1
+      || memcmp (dst, "hello world world\0XXX", 21))
+    abort();
+
+  /* Test at least one instance of the __builtin_ style.  We do this
+     to ensure that it works and that the prototype is correct.  */
+  RESET_DST_WITH (s1);
+  if (__builtin_strncat (dst, "", 100) != dst
+      || memcmp (dst, "hello world\0XXX", 15))
+    abort();
+}