1 files changed, 140 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/strncmp-1.c b/gcc/testsuite/gcc.c-torture/execute/strncmp-1.c
new file mode 100644
index 00000000000..dee904ff1e6
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/strncmp-1.c
@@ -0,0 +1,140 @@
+/* Copyright (C) 2002  Free Software Foundation.
+
+   Test strncmp with various combinations of pointer alignments and lengths to
+   make sure any optimizations in the library are correct.
+
+   Written by Michael Meissner, March 9, 2002.  */
+
+#include <string.h>
+#include <stddef.h>
+
+#ifndef MAX_OFFSET
+#define MAX_OFFSET (sizeof (long long))
+#endif
+
+#ifndef MAX_TEST
+#define MAX_TEST (8 * sizeof (long long))
+#endif
+
+#ifndef MAX_EXTRA
+#define MAX_EXTRA (sizeof (long long))
+#endif
+
+#define MAX_LENGTH (MAX_OFFSET + MAX_TEST + MAX_EXTRA)
+
+static union {
+  unsigned char buf[MAX_LENGTH];
+  long long align_int;
+  long double align_fp;
+} u1, u2;
+
+void
+test (const unsigned char *s1, const unsigned char *s2, size_t len, int expected)
+{
+  int value = strncmp ((char *) s1, (char *) s2, len);
+
+  if (expected < 0 && value >= 0)
+    abort ();
+  else if (expected == 0 && value != 0)
+    abort ();
+  else if (expected > 0 && value <= 0)
+    abort ();
+}
+
+main ()
+{
+  size_t off1, off2, len, i;
+  unsigned char *buf1, *buf2;
+  unsigned char *mod1, *mod2;
+  unsigned char *p1, *p2;
+
+  for (off1 = 0; off1 < MAX_OFFSET; off1++)
+    for (off2 = 0; off2 < MAX_OFFSET; off2++)
+      for (len = 0; len < MAX_TEST; len++)
+	{
+	  p1 = u1.buf;
+	  for (i = 0; i < off1; i++)
+	    *p1++ = '\0';
+
+	  buf1 = p1;
+	  for (i = 0; i < len; i++)
+	    *p1++ = 'a';
+
+	  mod1 = p1;
+	  for (i = 0; i < MAX_EXTRA; i++)
+	    *p1++ = 'x';
+
+	  p2 = u2.buf;
+	  for (i = 0; i < off2; i++)
+	    *p2++ = '\0';
+
+	  buf2 = p2;
+	  for (i = 0; i < len; i++)
+	    *p2++ = 'a';
+
+	  mod2 = p2;
+	  for (i = 0; i < MAX_EXTRA; i++)
+	    *p2++ = 'x';
+
+	  mod1[0] = '\0';
+	  mod2[0] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, 0);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = 'a';
+	  mod1[1] = '\0';
+	  mod2[0] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, +1);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = '\0';
+	  mod2[0] = 'a';
+	  mod2[1] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, -1);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = 'b';
+	  mod1[1] = '\0';
+	  mod2[0] = 'c';
+	  mod2[1] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, -1);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = 'c';
+	  mod1[1] = '\0';
+	  mod2[0] = 'b';
+	  mod2[1] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, +1);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = 'b';
+	  mod1[1] = '\0';
+	  mod2[0] = (unsigned char)'\251';
+	  mod2[1] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, -1);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = (unsigned char)'\251';
+	  mod1[1] = '\0';
+	  mod2[0] = 'b';
+	  mod2[1] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, +1);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = (unsigned char)'\251';
+	  mod1[1] = '\0';
+	  mod2[0] = (unsigned char)'\252';
+	  mod2[1] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, -1);
+	  test (buf1, buf2, len, 0);
+
+	  mod1[0] = (unsigned char)'\252';
+	  mod1[1] = '\0';
+	  mod2[0] = (unsigned char)'\251';
+	  mod2[1] = '\0';
+	  test (buf1, buf2, MAX_LENGTH, +1);
+	  test (buf1, buf2, len, 0);
+	}
+
+  exit (0);
+}