1 files changed, 73 insertions, 0 deletions
diff --git a/src/grep/gnulib-tests/test-calloc-gnu.c b/src/grep/gnulib-tests/test-calloc-gnu.c
new file mode 100644
index 0000000..a98a75f
--- /dev/null
+++ b/src/grep/gnulib-tests/test-calloc-gnu.c
@@ -0,0 +1,73 @@
+/* Test of calloc function.
+   Copyright (C) 2010-2021 Free Software Foundation, Inc.
+
+   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>
+
+/* Specification.  */
+#include <stdlib.h>
+
+#include <errno.h>
+#include <stdint.h>
+
+#include "macros.h"
+
+/* Return N.
+   Usual compilers are not able to infer something about the return value.  */
+static size_t
+identity (size_t n)
+{
+  unsigned int x = rand ();
+  unsigned int y = x * x * x * x;
+  x++; y |= x * x * x * x;
+  x++; y |= x * x * x * x;
+  x++; y |= x * x * x * x;
+  y = y >> 1;
+  y &= -y;
+  y -= 8;
+  /* At this point Y is zero but GCC doesn't infer this.  */
+  return n + y;
+}
+
+int
+main ()
+{
+  /* Check that calloc (0, 0) is not a NULL pointer.  */
+  {
+    void * volatile p = calloc (0, 0);
+    ASSERT (p != NULL);
+    free (p);
+  }
+
+  /* Check that calloc fails when requested to allocate a block of memory
+     larger than PTRDIFF_MAX or SIZE_MAX bytes.
+     Use 'identity' to avoid a compiler warning from GCC 7.
+     'volatile' is needed to defeat an incorrect optimization by clang 10,
+     see <https://bugs.llvm.org/show_bug.cgi?id=46055>.  */
+  {
+    for (size_t n = 2; n != 0; n <<= 1)
+      {
+        void *volatile p = calloc (PTRDIFF_MAX / n + 1, identity (n));
+        ASSERT (p == NULL);
+        ASSERT (errno == ENOMEM);
+
+	p = calloc (SIZE_MAX / n + 1, identity (n));
+        ASSERT (p == NULL);
+        ASSERT (errno == ENOMEM);
+      }
+  }
+
+  return 0;
+}