1# canonicalize.m4 serial 23
2
3dnl Copyright (C) 2003-2007, 2009-2011 Free Software Foundation, Inc.
4
5dnl This file is free software; the Free Software Foundation
6dnl gives unlimited permission to copy and/or distribute it,
7dnl 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.
11AC_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.
25AC_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 "$gl_cv_func_realpath_works" != yes; then
37    REPLACE_CANONICALIZE_FILE_NAME=1
38    REPLACE_REALPATH=1
39  fi
40])
41
42# Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
43# (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
44AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
45[
46  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
47  AC_CHECK_FUNCS_ONCE([canonicalize_file_name getcwd readlink])
48  AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
49  AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
50  AC_CHECK_HEADERS_ONCE([sys/param.h])
51])
52
53# Check whether realpath works.  Assume that if a platform has both
54# realpath and canonicalize_file_name, but the former is broken, then
55# so is the latter.
56AC_DEFUN([gl_FUNC_REALPATH_WORKS],
57[
58  AC_CHECK_FUNCS_ONCE([realpath])
59  AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
60    touch conftest.a
61    mkdir conftest.d
62    AC_RUN_IFELSE([
63      AC_LANG_PROGRAM([[
64        ]GL_NOCRASH[
65        #include <stdlib.h>
66        #include <string.h>
67      ]], [[
68        int result = 0;
69        {
70          char *name = realpath ("conftest.a", NULL);
71          if (!(name && *name == '/'))
72            result |= 1;
73        }
74        {
75          char *name = realpath ("conftest.b/../conftest.a", NULL);
76          if (name != NULL)
77            result |= 2;
78        }
79        {
80          char *name = realpath ("conftest.a/", NULL);
81          if (name != NULL)
82            result |= 4;
83        }
84        {
85          char *name1 = realpath (".", NULL);
86          char *name2 = realpath ("conftest.d//./..", NULL);
87          if (strcmp (name1, name2) != 0)
88            result |= 8;
89        }
90        return result;
91      ]])
92    ], [gl_cv_func_realpath_works=yes], [gl_cv_func_realpath_works=no],
93       [gl_cv_func_realpath_works="guessing no"])
94    rm -rf conftest.a conftest.d
95  ])
96  if test "$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])
102