string: Add memrchr test

Add new memrchr test.

1 files changed, 97 insertions, 0 deletions

diff --git a/string/test/memrchr.c b/string/test/memrchr.c
new file mode 100644
index 0000000..20bb3a1
--- /dev/null
+++ b/string/test/memrchr.c
@@ -0,0 +1,97 @@
+/*
+ * memchr test.
+ *
+ * Copyright (c) 2020, Arm Limited.
+ * SPDX-License-Identifier: MIT
+ */
+
+#define _GNU_SOURCE
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include "stringlib.h"
+#include "stringtest.h"
+
+#define F(x) {#x, x},
+
+static const struct fun
+{
+  const char *name;
+  void *(*fun) (const void *s, int c, size_t n);
+} funtab[] = {
+  // clang-format off
+  F(memrchr)
+#if __aarch64__
+  F(__memrchr_aarch64)
+#endif
+  {0, 0}
+  // clang-format on
+};
+#undef F
+
+#define ALIGN 32
+#define LEN 512
+static char sbuf[LEN + 3 * ALIGN];
+
+static void *
+alignup (void *p)
+{
+  return (void *) (((uintptr_t) p + ALIGN - 1) & -ALIGN);
+}
+
+static void
+test (const struct fun *fun, int align, size_t seekpos, size_t len,
+      size_t maxlen)
+{
+  char *src = alignup (sbuf);
+  char *s = src + align;
+  char *f = seekpos < maxlen ? s + seekpos : NULL;
+  int seekchar = 1;
+  void *p;
+
+  if (err_count >= ERR_LIMIT)
+    return;
+  if (len > LEN || seekpos > LEN || align > ALIGN)
+    abort ();
+
+  for (int i = 0; src + i < s; i++)
+    src[i] = seekchar;
+  for (int i = 0; i <= ALIGN; i++)
+    s[len + i] = seekchar;
+  for (int i = 0; i < len; i++)
+    s[i] = 'a' + (i & 31);
+  s[seekpos] = seekchar;
+  s[((len ^ align) & 1) && seekpos < maxlen ? seekpos - 1 : len] = seekchar;
+
+  p = fun->fun (s, seekchar, maxlen);
+  if (p != f)
+    {
+      ERR ("%s (%p, 0x%02x, %zu) returned %p, expected %p\n", fun->name, s,
+	   seekchar, maxlen, p, f);
+      quote ("input", s, len);
+    }
+}
+
+int
+main (void)
+{
+  int r = 0;
+  for (int i = 0; funtab[i].name; i++)
+    {
+      err_count = 0;
+      for (int a = 0; a < ALIGN; a++)
+	for (int n = 0; n < LEN; n++)
+	  {
+	    for (int sp = 0; sp < LEN; sp++)
+	      test (funtab + i, a, sp, n, n);
+	  }
+
+      printf ("%s %s\n", err_count ? "FAIL" : "PASS", funtab[i].name);
+      if (err_count)
+	r = -1;
+    }
+  return r;
+}