3 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006,
4 # 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
6 # This file is free software; the Free Software Foundation
7 # gives unlimited permission to copy and/or distribute it,
8 # with or without modifications, as long as this notice is preserved.
10 dnl Initially derived from code in GNU grep.
11 dnl Mostly written by Jim Meyering.
17 AC_CHECK_HEADERS_ONCE([locale.h])
19 AC_ARG_WITH([included-regex],
20 [AS_HELP_STRING([--without-included-regex],
21 [don't compile regex; this is the default on systems
22 with recent-enough versions of the GNU C Library
23 (use with caution on other systems).])])
25 case $with_included_regex in #(
26 yes|no) ac_use_included_regex=$with_included_regex
29 # If the system regex support is good enough that it passes the
30 # following run test, then default to *not* using the included regex.c.
31 # If cross compiling, assume the test would fail and use the included
33 AC_CACHE_CHECK([for working re_compile_pattern],
34 [gl_cv_func_re_compile_pattern_working],
44 [[static struct re_pattern_buffer regex;
45 unsigned char folded_chars[UCHAR_MAX + 1];
48 struct re_registers regs;
51 /* http://sourceware.org/ml/libc-hacker/2006-09/msg00008.html
52 This test needs valgrind to catch the bug on Debian
53 GNU/Linux 3.1 x86, but it might catch the bug better
54 on other platforms and it shouldn't hurt to try the
56 if (setlocale (LC_ALL, "en_US.UTF-8"))
58 static char const pat[] = "insert into";
59 static char const data[] =
60 "\xFF\0\x12\xA2\xAA\xC4\xB1,K\x12\xC4\xB1*\xACK";
61 re_set_syntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE
63 memset (®ex, 0, sizeof regex);
64 s = re_compile_pattern (pat, sizeof pat - 1, ®ex);
67 if (re_search (®ex, data, sizeof data - 1,
68 0, sizeof data - 1, ®s)
71 if (! setlocale (LC_ALL, "C"))
76 /* This test is from glibc bug 3957, reported by Andrew Mackey. */
77 re_set_syntax (RE_SYNTAX_EGREP | RE_HAT_LISTS_NOT_NEWLINE);
78 memset (®ex, 0, sizeof regex);
79 s = re_compile_pattern ("a[^x]b", 6, ®ex);
83 /* This should fail, but succeeds for glibc-2.5. */
84 if (re_search (®ex, "a\nb", 3, 0, 3, ®s) != -1)
87 /* This regular expression is from Spencer ere test number 75
89 re_set_syntax (RE_SYNTAX_POSIX_EGREP);
90 memset (®ex, 0, sizeof regex);
91 for (i = 0; i <= UCHAR_MAX; i++)
93 regex.translate = folded_chars;
94 s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, ®ex);
95 /* This should fail with _Invalid character class name_ error. */
99 /* Ensure that [b-a] is diagnosed as invalid, when
100 using RE_NO_EMPTY_RANGES. */
101 re_set_syntax (RE_SYNTAX_POSIX_EGREP | RE_NO_EMPTY_RANGES);
102 memset (®ex, 0, sizeof regex);
103 s = re_compile_pattern ("a[b-a]", 6, ®ex);
107 /* This should succeed, but does not for glibc-2.1.3. */
108 memset (®ex, 0, sizeof regex);
109 s = re_compile_pattern ("{1", 2, ®ex);
114 /* The following example is derived from a problem report
115 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
116 memset (®ex, 0, sizeof regex);
117 s = re_compile_pattern ("[an\371]*n", 7, ®ex);
121 /* This should match, but does not for glibc-2.2.1. */
122 if (re_match (®ex, "an", 2, 0, ®s) != 2)
125 memset (®ex, 0, sizeof regex);
126 s = re_compile_pattern ("x", 1, ®ex);
130 /* glibc-2.2.93 does not work with a negative RANGE argument. */
131 if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
134 /* The version of regex.c in older versions of gnulib
135 ignored RE_ICASE. Detect that problem too. */
136 re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
137 memset (®ex, 0, sizeof regex);
138 s = re_compile_pattern ("x", 1, ®ex);
142 if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
145 /* Catch a bug reported by Vin Shelton in
146 http://lists.gnu.org/archive/html/bug-coreutils/2007-06/msg00089.html
148 re_set_syntax (RE_SYNTAX_POSIX_BASIC
149 & ~RE_CONTEXT_INVALID_DUP
150 & ~RE_NO_EMPTY_RANGES);
151 memset (®ex, 0, sizeof regex);
152 s = re_compile_pattern ("[[:alnum:]_-]\\\\+$", 16, ®ex);
156 /* REG_STARTEND was added to glibc on 2004-01-15.
157 Reject older versions. */
161 /* Reject hosts whose regoff_t values are too narrow.
162 These include glibc 2.3.5 on hosts with 64-bit ptrdiff_t
164 if (sizeof (regoff_t) < sizeof (ptrdiff_t)
165 || sizeof (regoff_t) < sizeof (ssize_t))
169 [gl_cv_func_re_compile_pattern_working=yes],
170 [gl_cv_func_re_compile_pattern_working=no],
171 dnl When crosscompiling, assume it is not working.
172 [gl_cv_func_re_compile_pattern_working=no])])
173 case $gl_cv_func_re_compile_pattern_working in #(
174 yes) ac_use_included_regex=no;; #(
175 no) ac_use_included_regex=yes;;
178 *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
182 if test $ac_use_included_regex = yes; then
183 AC_DEFINE([_REGEX_LARGE_OFFSETS], [1],
184 [Define if you want regoff_t to be at least as wide POSIX requires.])
185 AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
186 [Define to rpl_re_syntax_options if the replacement should be used.])
187 AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
188 [Define to rpl_re_set_syntax if the replacement should be used.])
189 AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
190 [Define to rpl_re_compile_pattern if the replacement should be used.])
191 AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
192 [Define to rpl_re_compile_fastmap if the replacement should be used.])
193 AC_DEFINE([re_search], [rpl_re_search],
194 [Define to rpl_re_search if the replacement should be used.])
195 AC_DEFINE([re_search_2], [rpl_re_search_2],
196 [Define to rpl_re_search_2 if the replacement should be used.])
197 AC_DEFINE([re_match], [rpl_re_match],
198 [Define to rpl_re_match if the replacement should be used.])
199 AC_DEFINE([re_match_2], [rpl_re_match_2],
200 [Define to rpl_re_match_2 if the replacement should be used.])
201 AC_DEFINE([re_set_registers], [rpl_re_set_registers],
202 [Define to rpl_re_set_registers if the replacement should be used.])
203 AC_DEFINE([re_comp], [rpl_re_comp],
204 [Define to rpl_re_comp if the replacement should be used.])
205 AC_DEFINE([re_exec], [rpl_re_exec],
206 [Define to rpl_re_exec if the replacement should be used.])
207 AC_DEFINE([regcomp], [rpl_regcomp],
208 [Define to rpl_regcomp if the replacement should be used.])
209 AC_DEFINE([regexec], [rpl_regexec],
210 [Define to rpl_regexec if the replacement should be used.])
211 AC_DEFINE([regerror], [rpl_regerror],
212 [Define to rpl_regerror if the replacement should be used.])
213 AC_DEFINE([regfree], [rpl_regfree],
214 [Define to rpl_regfree if the replacement should be used.])
220 # Prerequisites of lib/regex.c and lib/regex_internal.c.
221 AC_DEFUN([gl_PREREQ_REGEX],
223 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
224 AC_REQUIRE([AC_C_INLINE])
225 AC_REQUIRE([AC_C_RESTRICT])
226 AC_REQUIRE([AC_TYPE_MBSTATE_T])
227 AC_CHECK_HEADERS([libintl.h])
228 AC_CHECK_FUNCS_ONCE([isblank iswctype wcscoll])
229 AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])