2004-11-18 07:09:12 +08:00
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# calloc.m4 serial 3
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2004-05-30 00:53:45 +08:00
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2004-11-18 07:09:12 +08:00
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# Copyright (C) 2004 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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2004-05-30 00:53:45 +08:00
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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_HEADER_STDC])dnl
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2004-11-18 07:09:12 +08:00
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AC_REQUIRE([AC_TYPE_SIZE_T])dnl
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2004-05-30 00:53:45 +08:00
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AC_CHECK_HEADERS(stdlib.h)
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AC_CACHE_CHECK([for GNU libc compatible calloc], ac_cv_func_calloc_0_nonnull,
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2004-11-18 07:09:12 +08:00
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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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2004-05-30 00:53:45 +08:00
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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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])# AC_FUNC_CALLOC
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# AC_FUNC_CALLOC
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# ---------------
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# Report whether `calloc (0, 0)' is properly handled, and replace calloc if
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# needed.
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AC_DEFUN([AC_FUNC_CALLOC],
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[_AC_FUNC_CALLOC_IF(
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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_LIBOBJ([calloc])
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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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])# AC_FUNC_CALLOC
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