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54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
# strndup.m4 serial 16
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dnl Copyright (C) 2002-2003, 2005-2009 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_STRNDUP],
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[
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dnl Persuade glibc <string.h> to declare strndup().
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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AC_CHECK_DECLS_ONCE([strndup])
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if test $ac_cv_have_decl_strndup = no; then
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HAVE_DECL_STRNDUP=0
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fi
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# AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
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AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup],
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[AC_RUN_IFELSE([
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AC_LANG_PROGRAM([[#include <string.h>
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#include <stdlib.h>]], [[
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#ifndef HAVE_DECL_STRNDUP
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extern char *strndup (const char *, size_t);
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#endif
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char *s;
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s = strndup ("some longer string", 15);
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free (s);
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s = strndup ("shorter string", 13);
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return s[13] != '\0';]])],
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[gl_cv_func_strndup=yes],
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[gl_cv_func_strndup=no],
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[AC_CHECK_FUNC([strndup],
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[AC_EGREP_CPP([too risky], [
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#ifdef _AIX
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too risky
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#endif
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],
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[gl_cv_func_strndup=no],
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[gl_cv_func_strndup=yes])],
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[gl_cv_func_strndup=no])])])
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if test $gl_cv_func_strndup = yes; then
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AC_DEFINE([HAVE_STRNDUP], [1],
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[Define if you have the strndup() function and it works.])
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else
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HAVE_STRNDUP=0
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AC_LIBOBJ([strndup])
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gl_PREREQ_STRNDUP
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fi
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])
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# Prerequisites of lib/strndup.c.
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AC_DEFUN([gl_PREREQ_STRNDUP], [:])
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