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45 lines
1.7 KiB
Plaintext
45 lines
1.7 KiB
Plaintext
# calloc.m4 serial 5
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# Copyright (C) 2004, 2005 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_HEADER_STDC])dnl
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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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])# 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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