1 files changed, 92 insertions, 0 deletions
diff --git a/gnulib-tests/test-rawmemchr.c b/gnulib-tests/test-rawmemchr.c
new file mode 100644
index 0000000..7f2949a
--- /dev/null
+++ b/gnulib-tests/test-rawmemchr.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2008-2022 Free Software Foundation, Inc.
+ * Written by Eric Blake and Bruno Haible
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <string.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (rawmemchr, void *, (void const *, int));
+
+#include <stdlib.h>
+
+#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 RAWMEMCHR (char *) rawmemchr
+
+int
+main (void)
+{
+  size_t n = 0x100000;
+  char *input = malloc (n + 1);
+  ASSERT (input);
+
+  input[0] = 'a';
+  input[1] = 'b';
+  memset (input + 2, 'c', 1024);
+  memset (input + 1026, 'd', n - 1028);
+  input[n - 2] = 'e';
+  input[n - 1] = 'a';
+  input[n] = '\0';
+
+  /* Basic behavior tests.  */
+  ASSERT (RAWMEMCHR (input, 'a') == input);
+  ASSERT (RAWMEMCHR (input, 'b') == input + 1);
+  ASSERT (RAWMEMCHR (input, 'c') == input + 2);
+  ASSERT (RAWMEMCHR (input, 'd') == input + 1026);
+
+  ASSERT (RAWMEMCHR (input + 1, 'a') == input + n - 1);
+  ASSERT (RAWMEMCHR (input + 1, 'e') == input + n - 2);
+  ASSERT (RAWMEMCHR (input + 1, 0x789abc00 | 'e') == input + n - 2);
+
+  ASSERT (RAWMEMCHR (input, '\0') == input + n);
+
+  /* Alignment tests.  */
+  {
+    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 (RAWMEMCHR (input + i, j) == input + i + j);
+          }
+      }
+  }
+
+  /* Ensure that no unaligned oversized reads occur.  */
+  {
+    char *page_boundary = (char *) zerosize_ptr ();
+    size_t i;
+
+    if (!page_boundary)
+      page_boundary = input + 4096;
+    memset (page_boundary - 512, '1', 511);
+    page_boundary[-1] = '2';
+    for (i = 1; i <= 512; i++)
+      ASSERT (RAWMEMCHR (page_boundary - i, (i * 0x01010100) | '2')
+              == page_boundary - 1);
+  }
+
+  free (input);
+
+  return 0;
+}