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1 office 1 # canonicalize.m4 serial 23
2  
3 dnl Copyright (C) 2003-2007, 2009-2011 Free Software Foundation, Inc.
4  
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
8  
9 # Provides canonicalize_file_name and canonicalize_filename_mode, but does
10 # not provide or fix realpath.
11 AC_DEFUN([gl_FUNC_CANONICALIZE_FILENAME_MODE],
12 [
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 AC_CHECK_FUNCS_ONCE([canonicalize_file_name])
15 AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
16 AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
17 if test $ac_cv_func_canonicalize_file_name = no; then
18 HAVE_CANONICALIZE_FILE_NAME=0
19 elif test "$gl_cv_func_realpath_works" != yes; then
20 REPLACE_CANONICALIZE_FILE_NAME=1
21 fi
22 ])
23  
24 # Provides canonicalize_file_name and realpath.
25 AC_DEFUN([gl_CANONICALIZE_LGPL],
26 [
27 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
28 AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE])
29 if test $ac_cv_func_canonicalize_file_name = no; then
30 HAVE_CANONICALIZE_FILE_NAME=0
31 if test $ac_cv_func_realpath = no; then
32 HAVE_REALPATH=0
33 elif test "$gl_cv_func_realpath_works" != yes; then
34 REPLACE_REALPATH=1
35 fi
36 elif test "$gl_cv_func_realpath_works" != yes; then
37 REPLACE_CANONICALIZE_FILE_NAME=1
38 REPLACE_REALPATH=1
39 fi
40 ])
41  
42 # Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
43 # (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
44 AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
45 [
46 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
47 AC_CHECK_FUNCS_ONCE([canonicalize_file_name getcwd readlink])
48 AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
49 AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
50 AC_CHECK_HEADERS_ONCE([sys/param.h])
51 ])
52  
53 # Check whether realpath works. Assume that if a platform has both
54 # realpath and canonicalize_file_name, but the former is broken, then
55 # so is the latter.
56 AC_DEFUN([gl_FUNC_REALPATH_WORKS],
57 [
58 AC_CHECK_FUNCS_ONCE([realpath])
59 AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
60 touch conftest.a
61 mkdir conftest.d
62 AC_RUN_IFELSE([
63 AC_LANG_PROGRAM([[
64 ]GL_NOCRASH[
65 #include <stdlib.h>
66 #include <string.h>
67 ]], [[
68 int result = 0;
69 {
70 char *name = realpath ("conftest.a", NULL);
71 if (!(name && *name == '/'))
72 result |= 1;
73 }
74 {
75 char *name = realpath ("conftest.b/../conftest.a", NULL);
76 if (name != NULL)
77 result |= 2;
78 }
79 {
80 char *name = realpath ("conftest.a/", NULL);
81 if (name != NULL)
82 result |= 4;
83 }
84 {
85 char *name1 = realpath (".", NULL);
86 char *name2 = realpath ("conftest.d//./..", NULL);
87 if (strcmp (name1, name2) != 0)
88 result |= 8;
89 }
90 return result;
91 ]])
92 ], [gl_cv_func_realpath_works=yes], [gl_cv_func_realpath_works=no],
93 [gl_cv_func_realpath_works="guessing no"])
94 rm -rf conftest.a conftest.d
95 ])
96 if test "$gl_cv_func_realpath_works" = yes; then
97 AC_DEFINE([FUNC_REALPATH_WORKS], [1], [Define to 1 if realpath()
98 can malloc memory, always gives an absolute path, and handles
99 trailing slash correctly.])
100 fi
101 ])