Imported Upstream version 1.3.14

[debian/gzip] / lib / calloc.c

diff --git a/lib/calloc.c b/lib/calloc.c
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+/* calloc() function that is glibc compatible.
+   This wrapper function is required at least on Tru64 UNIX 5.1 and mingw.
+   Copyright (C) 2004, 2005, 2006, 2007 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 <http://www.gnu.org/licenses/>.  */
+
+/* written by Jim Meyering and Bruno Haible */
+
+#include <config.h>
+/* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h.  */
+#ifdef calloc
+# define NEED_CALLOC_GNU
+# undef calloc
+#endif
+
+/* Specification.  */
+#include <stdlib.h>
+
+#include <errno.h>
+
+/* Call the system's calloc below.  */
+#undef calloc
+
+/* Allocate and zero-fill an NxS-byte block of memory from the heap.
+   If N or S is zero, allocate and zero-fill a 1-byte block.  */
+
+void *
+rpl_calloc (size_t n, size_t s)
+{
+  void *result;
+
+#ifdef NEED_CALLOC_GNU
+  if (n == 0 || s == 0)
+    {
+      n = 1;
+      s = 1;
+    }
+  else
+    {
+      /* Defend against buggy calloc implementations that mishandle
+        size_t overflow.  */
+      size_t bytes = n * s;
+      if (bytes / s != n)
+       {
+         errno = ENOMEM;
+         return NULL;
+       }
+    }
+#endif
+
+  result = calloc (n, s);
+
+#if !HAVE_CALLOC_POSIX
+  if (result == NULL)
+    errno = ENOMEM;
+#endif
+
+  return result;
+}