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# calloc.m4 serial 20
# Copyright (C) 2004-2020 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_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([for GNU libc compatible calloc],
[ac_cv_func_calloc_0_nonnull],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[AC_INCLUDES_DEFAULT],
[[int result = 0;
char *p = calloc (0, 0);
if (!p)
result |= 1;
free (p);
p = calloc ((size_t) -1 / 8 + 1, 8);
if (p)
result |= 2;
free (p);
return result;
]])],
[ac_cv_func_calloc_0_nonnull=yes],
[ac_cv_func_calloc_0_nonnull=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
# Guess yes on musl systems.
*-musl*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
# Guess yes on native Windows.
mingw*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) ac_cv_func_calloc_0_nonnull="$gl_cross_guess_normal" ;;
esac
])])
case "$ac_cv_func_calloc_0_nonnull" in
*yes)
$1
;;
*)
$2
;;
esac
])# AC_FUNC_CALLOC
# gl_FUNC_CALLOC_GNU
# ------------------
# Report whether 'calloc (0, 0)' is properly handled, and replace calloc if
# needed.
AC_DEFUN([gl_FUNC_CALLOC_GNU],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
_AC_FUNC_CALLOC_IF(
[AC_DEFINE([HAVE_CALLOC_GNU], [1],
[Define to 1 if your system has a GNU libc compatible 'calloc'
function, and to 0 otherwise.])],
[AC_DEFINE([HAVE_CALLOC_GNU], [0])
REPLACE_CALLOC=1
])
])# gl_FUNC_CALLOC_GNU
# 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_STDLIB_H_DEFAULTS])
AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
if test $gl_cv_func_malloc_posix = yes; then
AC_DEFINE([HAVE_CALLOC_POSIX], [1],
[Define if the 'calloc' function is POSIX compliant.])
else
REPLACE_CALLOC=1
fi
])
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