Imported Upstream version 1.3.14

[debian/gzip] / m4 / calloc.m4

diff --git a/m4/calloc.m4 b/m4/calloc.m4
new file mode 100644 (file)
index 0000000..b0637b4
--- /dev/null
+++ b/m4/calloc.m4
@@ -0,0 +1,62 @@
+# calloc.m4 serial 9
+
+# Copyright (C) 2004-2009 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# Written by Jim Meyering.
+
+# Determine whether calloc (N, S) returns non-NULL when N*S is zero,
+# and returns NULL when N*S overflows.
+# If so, define HAVE_CALLOC.  Otherwise, define calloc to rpl_calloc
+# and arrange to use a calloc wrapper function that does work in that case.
+
+# _AC_FUNC_CALLOC_IF([IF-WORKS], [IF-NOT])
+# -------------------------------------
+# If `calloc (0, 0)' is properly handled, run IF-WORKS, otherwise, IF-NOT.
+AC_DEFUN([_AC_FUNC_CALLOC_IF],
+[AC_REQUIRE([AC_TYPE_SIZE_T])dnl
+AC_CACHE_CHECK([for GNU libc compatible calloc], [ac_cv_func_calloc_0_nonnull],
+[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+                 [[exit (!calloc (0, 0) || calloc ((size_t) -1 / 8 + 1, 8));]])],
+              [ac_cv_func_calloc_0_nonnull=yes],
+              [ac_cv_func_calloc_0_nonnull=no],
+              [ac_cv_func_calloc_0_nonnull=no])])
+AS_IF([test $ac_cv_func_calloc_0_nonnull = yes], [$1], [$2])
+])# AC_FUNC_CALLOC
+
+
+# AC_FUNC_CALLOC
+# ---------------
+# Report whether `calloc (0, 0)' is properly handled, and replace calloc if
+# needed.
+AC_DEFUN([AC_FUNC_CALLOC],
+[_AC_FUNC_CALLOC_IF(
+  [AC_DEFINE([HAVE_CALLOC], [1],
+            [Define to 1 if your system has a GNU libc compatible `calloc'
+             function, and to 0 otherwise.])],
+  [AC_DEFINE([HAVE_CALLOC], [0])
+   AC_LIBOBJ([calloc])
+   AC_DEFINE([calloc], [rpl_calloc],
+      [Define to rpl_calloc if the replacement function should be used.])])
+])# AC_FUNC_CALLOC
+
+
+# gl_FUNC_CALLOC_POSIX
+# --------------------
+# Test whether 'calloc' is POSIX compliant (sets errno to ENOMEM when it
+# fails), and replace calloc if it is not.
+AC_DEFUN([gl_FUNC_CALLOC_POSIX],
+[
+  AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
+  if test $gl_cv_func_malloc_posix = yes; then
+    HAVE_CALLOC_POSIX=1
+    AC_DEFINE([HAVE_CALLOC_POSIX], [1],
+      [Define if the 'calloc' function is POSIX compliant.])
+  else
+    AC_LIBOBJ([calloc])
+    HAVE_CALLOC_POSIX=0
+  fi
+  AC_SUBST([HAVE_CALLOC_POSIX])
+])