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comparison m4/strndup.m4 @ 272:d5392bb5da3c 2.5

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author lost
date Sun, 16 Aug 2009 17:16:49 +0000
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271:3b793ba7a6c6 272:d5392bb5da3c
1 # strndup.m4 serial 15
2 dnl Copyright (C) 2002-2003, 2005-2008 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
6
7 AC_DEFUN([gl_FUNC_STRNDUP],
8 [
9 dnl Persuade glibc <string.h> to declare strndup().
10 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
11
12 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
13 AC_CHECK_DECLS_ONCE([strndup])
14 if test $ac_cv_have_decl_strndup = no; then
15 HAVE_DECL_STRNDUP=0
16 fi
17
18 # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
19 AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
20 [AC_RUN_IFELSE([
21 AC_LANG_PROGRAM([[#include <string.h>
22 #include <stdlib.h>]], [[
23 #ifndef HAVE_DECL_STRNDUP
24 extern char *strndup (const char *, size_t);
25 #endif
26 char *s;
27 s = strndup ("some longer string", 15);
28 free (s);
29 s = strndup ("shorter string", 13);
30 return s[13] != '\0';]])],
31 [gl_cv_func_strndup=yes],
32 [gl_cv_func_strndup=no],
33 [AC_CHECK_FUNC([strndup],
34 [AC_EGREP_CPP([too risky], [
35 #ifdef _AIX
36 too risky
37 #endif
38 ],
39 [gl_cv_func_strndup=no],
40 [gl_cv_func_strndup=yes])],
41 [gl_cv_func_strndup=no])])])
42 if test $gl_cv_func_strndup = yes; then
43 AC_DEFINE([HAVE_STRNDUP], 1,
44 [Define if you have the strndup() function and it works.])
45 else
46 HAVE_STRNDUP=0
47 AC_LIBOBJ([strndup])
48 gl_PREREQ_STRNDUP
49 fi
50 ])
51
52 # Prerequisites of lib/strndup.c.
53 AC_DEFUN([gl_PREREQ_STRNDUP], [:])