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# Copyright (C) 2004-2010 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Jim Meyering.
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# Determine whether calloc (N, S) returns non-NULL when N*S is zero,
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# and returns NULL when N*S overflows.
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# If so, define HAVE_CALLOC. Otherwise, define calloc to rpl_calloc
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# and arrange to use a calloc wrapper function that does work in that case.
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# _AC_FUNC_CALLOC_IF([IF-WORKS], [IF-NOT])
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# -------------------------------------
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# If `calloc (0, 0)' is properly handled, run IF-WORKS, otherwise, IF-NOT.
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AC_DEFUN([_AC_FUNC_CALLOC_IF],
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[AC_REQUIRE([AC_TYPE_SIZE_T])dnl
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AC_CACHE_CHECK([for GNU libc compatible calloc], [ac_cv_func_calloc_0_nonnull],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
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[[exit (!calloc (0, 0) || calloc ((size_t) -1 / 8 + 1, 8));]])],
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[ac_cv_func_calloc_0_nonnull=yes],
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[ac_cv_func_calloc_0_nonnull=no],
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[ac_cv_func_calloc_0_nonnull=no])])
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AS_IF([test $ac_cv_func_calloc_0_nonnull = yes], [$1], [$2])
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# Report whether `calloc (0, 0)' is properly handled, and replace calloc if
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AC_DEFUN([AC_FUNC_CALLOC],
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[AC_DEFINE([HAVE_CALLOC], [1],
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[Define to 1 if your system has a GNU libc compatible `calloc'
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function, and to 0 otherwise.])],
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[AC_DEFINE([HAVE_CALLOC], [0])
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AC_DEFINE([calloc], [rpl_calloc],
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[Define to rpl_calloc if the replacement function should be used.])])
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# gl_FUNC_CALLOC_POSIX
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# --------------------
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# Test whether 'calloc' is POSIX compliant (sets errno to ENOMEM when it
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# fails), and replace calloc if it is not.
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AC_DEFUN([gl_FUNC_CALLOC_POSIX],
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AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
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if test $gl_cv_func_malloc_posix = yes; then
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AC_DEFINE([HAVE_CALLOC_POSIX], [1],
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[Define if the 'calloc' function is POSIX compliant.])
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AC_SUBST([HAVE_CALLOC_POSIX])