|
272
|
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], [:])
|
