X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-memchr.c;h=a11f6cdb9710bbfc186114f2f42fd87cb4603128;hb=ab426d01279fa5cb18891d4f088dc13683f86659;hp=ebf3cfcdc5189adeec9ad821caa490948487aa78;hpb=a0dc688369a937a657cdf8d35f362c3068b0af9a;p=gnulib.git

diff --git a/tests/test-memchr.c b/tests/test-memchr.c
index ebf3cfcdc..a11f6cdb9 100644
--- a/tests/test-memchr.c
+++ b/tests/test-memchr.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008 Free Software Foundation
+ * Copyright (C) 2008-2011 Free Software Foundation, Inc.
  * Written by Eric Blake and Bruno Haible
  *
  * This program is free software: you can redistribute it and/or modify
@@ -19,30 +19,21 @@
 
 #include <string.h>
 
-#include <stdio.h>
+#include "signature.h"
+SIGNATURE_CHECK (memchr, void *, (void const *, int, size_t));
+
 #include <stdlib.h>
 
-#define ASSERT(expr) \
-  do									     \
-    {									     \
-      if (!(expr))							     \
-	{								     \
-	  fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
-	  fflush (stderr);						     \
-	  abort ();							     \
-	}								     \
-    }									     \
-  while (0)
+#include "zerosize-ptr.h"
+#include "macros.h"
 
 /* Calculating void * + int is not portable, so this wrapper converts
    to char * to make the tests easier to write.  */
 #define MEMCHR (char *) memchr
 
 int
-main ()
+main (void)
 {
-  void *nil = NULL; /* Use to avoid gcc attribute((nonnull)) warnings.  */
-
   size_t n = 0x100000;
   char *input = malloc (n);
   ASSERT (input);
@@ -58,7 +49,7 @@ main ()
   ASSERT (MEMCHR (input, 'a', n) == input);
 
   ASSERT (MEMCHR (input, 'a', 0) == NULL);
-  ASSERT (MEMCHR (nil, 'a', 0) == NULL);
+  ASSERT (MEMCHR (zerosize_ptr (), 'a', 0) == NULL);
 
   ASSERT (MEMCHR (input, 'b', n) == input + 1);
   ASSERT (MEMCHR (input, 'c', n) == input + 2);
@@ -66,6 +57,7 @@ main ()
 
   ASSERT (MEMCHR (input + 1, 'a', n - 1) == input + n - 1);
   ASSERT (MEMCHR (input + 1, 'e', n - 1) == input + n - 2);
+  ASSERT (MEMCHR (input + 1, 0x789abc00 | 'e', n - 1) == input + n - 2);
 
   ASSERT (MEMCHR (input, 'f', n) == NULL);
   ASSERT (MEMCHR (input, '\0', n) == NULL);
@@ -76,7 +68,7 @@ main ()
     size_t repeat = 10000;
     for (; repeat > 0; repeat--)
       {
-	ASSERT (MEMCHR (input, 'c', n) == input + 2);
+        ASSERT (MEMCHR (input, 'c', n) == input + 2);
       }
   }
 
@@ -85,12 +77,52 @@ main ()
     int i, j;
     for (i = 0; i < 32; i++)
       {
-	for (j = 0; j < 256; j++)
-	  input[i + j] = j;
-	for (j = 0; j < 256; j++)
-	  {
-	    ASSERT (MEMCHR (input + i, j, 256) == input + i + j);
-	  }
+        for (j = 0; j < 256; j++)
+          input[i + j] = j;
+        for (j = 0; j < 256; j++)
+          {
+            ASSERT (MEMCHR (input + i, j, 256) == input + i + j);
+          }
+      }
+  }
+
+  /* Check that memchr() does not read past the first occurrence of the
+     byte being searched.  See the Austin Group's clarification
+     <http://www.opengroup.org/austin/docs/austin_454.txt>.
+     Test both '\0' and something else, since some implementations
+     special-case searching for NUL.
+  */
+  {
+    char *page_boundary = (char *) zerosize_ptr ();
+    /* Too small, and we miss cache line boundary tests; too large,
+       and the test takes cubically longer to complete.  */
+    int limit = 257;
+
+    if (page_boundary != NULL)
+      {
+        for (n = 1; n <= limit; n++)
+          {
+            char *mem = page_boundary - n;
+            memset (mem, 'X', n);
+            ASSERT (MEMCHR (mem, 'U', n) == NULL);
+            ASSERT (MEMCHR (mem, 0, n) == NULL);
+
+            {
+              size_t i;
+              size_t k;
+
+              for (i = 0; i < n; i++)
+                {
+                  mem[i] = 'U';
+                  for (k = i + 1; k < n + limit; k++)
+                    ASSERT (MEMCHR (mem, 'U', k) == mem + i);
+                  mem[i] = 0;
+                  for (k = i + 1; k < n + limit; k++)
+                    ASSERT (MEMCHR (mem, 0, k) == mem + i);
+                  mem[i] = 'X';
+                }
+            }
+          }
       }
   }