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],
45 static struct re_pattern_buffer regex;
46 unsigned char folded_chars[UCHAR_MAX + 1];
49 struct re_registers regs;
52 /* http://sourceware.org/ml/libc-hacker/2006-09/msg00008.html
53 This test needs valgrind to catch the bug on Debian
54 GNU/Linux 3.1 x86, but it might catch the bug better
55 on other platforms and it shouldn't hurt to try the
57 if (setlocale (LC_ALL, "en_US.UTF-8"))
59 static char const pat[] = "insert into";
60 static char const data[] =
61 "\xFF\0\x12\xA2\xAA\xC4\xB1,K\x12\xC4\xB1*\xACK";
62 re_set_syntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE
64 memset (®ex, 0, sizeof regex);
65 s = re_compile_pattern (pat, sizeof pat - 1, ®ex);
68 else if (re_search (®ex, data, sizeof data - 1,
69 0, sizeof data - 1, ®s)
72 if (! setlocale (LC_ALL, "C"))
77 /* This test is from glibc bug 3957, reported by Andrew Mackey. */
78 re_set_syntax (RE_SYNTAX_EGREP | RE_HAT_LISTS_NOT_NEWLINE);
79 memset (®ex, 0, sizeof regex);
80 s = re_compile_pattern ("a[^x]b", 6, ®ex);
83 /* This should fail, but succeeds for glibc-2.5. */
84 else 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);
113 /* The following example is derived from a problem report
114 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
115 memset (®ex, 0, sizeof regex);
116 s = re_compile_pattern ("[an\371]*n", 7, ®ex);
119 /* This should match, but does not for glibc-2.2.1. */
120 else if (re_match (®ex, "an", 2, 0, ®s) != 2)
123 memset (®ex, 0, sizeof regex);
124 s = re_compile_pattern ("x", 1, ®ex);
127 /* glibc-2.2.93 does not work with a negative RANGE argument. */
128 else if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
131 /* The version of regex.c in older versions of gnulib
132 ignored RE_ICASE. Detect that problem too. */
133 re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
134 memset (®ex, 0, sizeof regex);
135 s = re_compile_pattern ("x", 1, ®ex);
138 else if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
141 /* Catch a bug reported by Vin Shelton in
142 http://lists.gnu.org/archive/html/bug-coreutils/2007-06/msg00089.html
144 re_set_syntax (RE_SYNTAX_POSIX_BASIC
145 & ~RE_CONTEXT_INVALID_DUP
146 & ~RE_NO_EMPTY_RANGES);
147 memset (®ex, 0, sizeof regex);
148 s = re_compile_pattern ("[[:alnum:]_-]\\\\+$", 16, ®ex);
152 /* REG_STARTEND was added to glibc on 2004-01-15.
153 Reject older versions. */
158 /* It would be nice to reject hosts whose regoff_t values are too
159 narrow (including glibc on hosts with 64-bit ptrdiff_t and
160 32-bit int), but we should wait until glibc implements this
161 feature. Otherwise, support for equivalence classes and
162 multibyte collation symbols would always be broken except
163 when compiling --without-included-regex. */
164 if (sizeof (regoff_t) < sizeof (ptrdiff_t)
165 || sizeof (regoff_t) < sizeof (ssize_t))
171 [gl_cv_func_re_compile_pattern_working=yes],
172 [gl_cv_func_re_compile_pattern_working=no],
173 dnl When crosscompiling, assume it is not working.
174 [gl_cv_func_re_compile_pattern_working=no])])
175 case $gl_cv_func_re_compile_pattern_working in #(
176 yes) ac_use_included_regex=no;; #(
177 no) ac_use_included_regex=yes;;
180 *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
184 if test $ac_use_included_regex = yes; then
185 AC_DEFINE([_REGEX_LARGE_OFFSETS], [1],
186 [Define if you want regoff_t to be at least as wide POSIX requires.])
187 AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
188 [Define to rpl_re_syntax_options if the replacement should be used.])
189 AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
190 [Define to rpl_re_set_syntax if the replacement should be used.])
191 AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
192 [Define to rpl_re_compile_pattern if the replacement should be used.])
193 AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
194 [Define to rpl_re_compile_fastmap if the replacement should be used.])
195 AC_DEFINE([re_search], [rpl_re_search],
196 [Define to rpl_re_search if the replacement should be used.])
197 AC_DEFINE([re_search_2], [rpl_re_search_2],
198 [Define to rpl_re_search_2 if the replacement should be used.])
199 AC_DEFINE([re_match], [rpl_re_match],
200 [Define to rpl_re_match if the replacement should be used.])
201 AC_DEFINE([re_match_2], [rpl_re_match_2],
202 [Define to rpl_re_match_2 if the replacement should be used.])
203 AC_DEFINE([re_set_registers], [rpl_re_set_registers],
204 [Define to rpl_re_set_registers if the replacement should be used.])
205 AC_DEFINE([re_comp], [rpl_re_comp],
206 [Define to rpl_re_comp if the replacement should be used.])
207 AC_DEFINE([re_exec], [rpl_re_exec],
208 [Define to rpl_re_exec if the replacement should be used.])
209 AC_DEFINE([regcomp], [rpl_regcomp],
210 [Define to rpl_regcomp if the replacement should be used.])
211 AC_DEFINE([regexec], [rpl_regexec],
212 [Define to rpl_regexec if the replacement should be used.])
213 AC_DEFINE([regerror], [rpl_regerror],
214 [Define to rpl_regerror if the replacement should be used.])
215 AC_DEFINE([regfree], [rpl_regfree],
216 [Define to rpl_regfree if the replacement should be used.])
222 # Prerequisites of lib/regex.c and lib/regex_internal.c.
223 AC_DEFUN([gl_PREREQ_REGEX],
225 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
226 AC_REQUIRE([AC_C_INLINE])
227 AC_REQUIRE([AC_C_RESTRICT])
228 AC_REQUIRE([AC_TYPE_MBSTATE_T])
229 AC_CHECK_HEADERS([libintl.h])
230 AC_CHECK_FUNCS_ONCE([isblank iswctype wcscoll])
231 AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])