3 # Copyright (C) 2004-2010 Free Software Foundation, Inc.
4 # This file is free software; the Free Software Foundation
5 # gives unlimited permission to copy and/or distribute it,
6 # with or without modifications, as long as this notice is preserved.
8 # Written by Jim Meyering.
10 # Determine whether calloc (N, S) returns non-NULL when N*S is zero,
11 # and returns NULL when N*S overflows.
12 # If so, define HAVE_CALLOC. Otherwise, define calloc to rpl_calloc
13 # and arrange to use a calloc wrapper function that does work in that case.
15 # _AC_FUNC_CALLOC_IF([IF-WORKS], [IF-NOT])
16 # -------------------------------------
17 # If `calloc (0, 0)' is properly handled, run IF-WORKS, otherwise, IF-NOT.
18 AC_DEFUN([_AC_FUNC_CALLOC_IF],
19 [AC_REQUIRE([AC_TYPE_SIZE_T])dnl
20 AC_CACHE_CHECK([for GNU libc compatible calloc], [ac_cv_func_calloc_0_nonnull],
21 [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
22 [[exit (!calloc (0, 0) || calloc ((size_t) -1 / 8 + 1, 8));]])],
23 [ac_cv_func_calloc_0_nonnull=yes],
24 [ac_cv_func_calloc_0_nonnull=no],
25 [ac_cv_func_calloc_0_nonnull=no])])
26 AS_IF([test $ac_cv_func_calloc_0_nonnull = yes], [$1], [$2])
32 # Report whether `calloc (0, 0)' is properly handled, and replace calloc if
34 AC_DEFUN([gl_FUNC_CALLOC_GNU],
36 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
38 [AC_DEFINE([HAVE_CALLOC], [1],
39 [Define to 1 if your system has a GNU libc compatible `calloc'
40 function, and to 0 otherwise.])],
41 [AC_DEFINE([HAVE_CALLOC], [0])
44 ])# gl_FUNC_CALLOC_GNU
47 # gl_FUNC_CALLOC_POSIX
48 # --------------------
49 # Test whether 'calloc' is POSIX compliant (sets errno to ENOMEM when it
50 # fails), and replace calloc if it is not.
51 AC_DEFUN([gl_FUNC_CALLOC_POSIX],
53 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
54 AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
55 if test $gl_cv_func_malloc_posix = yes; then
56 AC_DEFINE([HAVE_CALLOC_POSIX], [1],
57 [Define if the 'calloc' function is POSIX compliant.])
63 AC_DEFUN([gl_REPLACE_CALLOC],