3 # Copyright (C) 1996-2001, 2003-2011 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
9 dnl Initially derived from code in GNU grep.
10 dnl Mostly written by Jim Meyering.
16 AC_CHECK_HEADERS_ONCE([locale.h])
18 AC_ARG_WITH([included-regex],
19 [AS_HELP_STRING([--without-included-regex],
20 [don't compile regex; this is the default on systems
21 with recent-enough versions of the GNU C Library
22 (use with caution on other systems).])])
24 case $with_included_regex in #(
25 yes|no) ac_use_included_regex=$with_included_regex
28 # If the system regex support is good enough that it passes the
29 # following run test, then default to *not* using the included regex.c.
30 # If cross compiling, assume the test would fail and use the included
32 AC_CACHE_CHECK([for working re_compile_pattern],
33 [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 else 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);
82 /* This should fail, but succeeds for glibc-2.5. */
83 else if (re_search (®ex, "a\nb", 3, 0, 3, ®s) != -1)
86 /* This regular expression is from Spencer ere test number 75
88 re_set_syntax (RE_SYNTAX_POSIX_EGREP);
89 memset (®ex, 0, sizeof regex);
90 for (i = 0; i <= UCHAR_MAX; i++)
92 regex.translate = folded_chars;
93 s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, ®ex);
94 /* This should fail with _Invalid character class name_ error. */
98 /* Ensure that [b-a] is diagnosed as invalid, when
99 using RE_NO_EMPTY_RANGES. */
100 re_set_syntax (RE_SYNTAX_POSIX_EGREP | RE_NO_EMPTY_RANGES);
101 memset (®ex, 0, sizeof regex);
102 s = re_compile_pattern ("a[b-a]", 6, ®ex);
106 /* This should succeed, but does not for glibc-2.1.3. */
107 memset (®ex, 0, sizeof regex);
108 s = re_compile_pattern ("{1", 2, ®ex);
112 /* The following example is derived from a problem report
113 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
114 memset (®ex, 0, sizeof regex);
115 s = re_compile_pattern ("[an\371]*n", 7, ®ex);
118 /* This should match, but does not for glibc-2.2.1. */
119 else if (re_match (®ex, "an", 2, 0, ®s) != 2)
122 memset (®ex, 0, sizeof regex);
123 s = re_compile_pattern ("x", 1, ®ex);
126 /* glibc-2.2.93 does not work with a negative RANGE argument. */
127 else if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
130 /* The version of regex.c in older versions of gnulib
131 ignored RE_ICASE. Detect that problem too. */
132 re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
133 memset (®ex, 0, sizeof regex);
134 s = re_compile_pattern ("x", 1, ®ex);
137 else if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
140 /* Catch a bug reported by Vin Shelton in
141 http://lists.gnu.org/archive/html/bug-coreutils/2007-06/msg00089.html
143 re_set_syntax (RE_SYNTAX_POSIX_BASIC
144 & ~RE_CONTEXT_INVALID_DUP
145 & ~RE_NO_EMPTY_RANGES);
146 memset (®ex, 0, sizeof regex);
147 s = re_compile_pattern ("[[:alnum:]_-]\\\\+$", 16, ®ex);
151 /* REG_STARTEND was added to glibc on 2004-01-15.
152 Reject older versions. */
157 /* It would be nice to reject hosts whose regoff_t values are too
158 narrow (including glibc on hosts with 64-bit ptrdiff_t and
159 32-bit int), but we should wait until glibc implements this
160 feature. Otherwise, support for equivalence classes and
161 multibyte collation symbols would always be broken except
162 when compiling --without-included-regex. */
163 if (sizeof (regoff_t) < sizeof (ptrdiff_t)
164 || sizeof (regoff_t) < sizeof (ssize_t))
170 [gl_cv_func_re_compile_pattern_working=yes],
171 [gl_cv_func_re_compile_pattern_working=no],
172 dnl When crosscompiling, assume it is not working.
173 [gl_cv_func_re_compile_pattern_working=no])])
174 case $gl_cv_func_re_compile_pattern_working in #(
175 yes) ac_use_included_regex=no;; #(
176 no) ac_use_included_regex=yes;;
179 *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
183 if test $ac_use_included_regex = yes; then
184 AC_DEFINE([_REGEX_LARGE_OFFSETS], [1],
185 [Define if you want regoff_t to be at least as wide POSIX requires.])
186 AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
187 [Define to rpl_re_syntax_options if the replacement should be used.])
188 AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
189 [Define to rpl_re_set_syntax if the replacement should be used.])
190 AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
191 [Define to rpl_re_compile_pattern if the replacement should be used.])
192 AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
193 [Define to rpl_re_compile_fastmap if the replacement should be used.])
194 AC_DEFINE([re_search], [rpl_re_search],
195 [Define to rpl_re_search if the replacement should be used.])
196 AC_DEFINE([re_search_2], [rpl_re_search_2],
197 [Define to rpl_re_search_2 if the replacement should be used.])
198 AC_DEFINE([re_match], [rpl_re_match],
199 [Define to rpl_re_match if the replacement should be used.])
200 AC_DEFINE([re_match_2], [rpl_re_match_2],
201 [Define to rpl_re_match_2 if the replacement should be used.])
202 AC_DEFINE([re_set_registers], [rpl_re_set_registers],
203 [Define to rpl_re_set_registers if the replacement should be used.])
204 AC_DEFINE([re_comp], [rpl_re_comp],
205 [Define to rpl_re_comp if the replacement should be used.])
206 AC_DEFINE([re_exec], [rpl_re_exec],
207 [Define to rpl_re_exec if the replacement should be used.])
208 AC_DEFINE([regcomp], [rpl_regcomp],
209 [Define to rpl_regcomp if the replacement should be used.])
210 AC_DEFINE([regexec], [rpl_regexec],
211 [Define to rpl_regexec if the replacement should be used.])
212 AC_DEFINE([regerror], [rpl_regerror],
213 [Define to rpl_regerror if the replacement should be used.])
214 AC_DEFINE([regfree], [rpl_regfree],
215 [Define to rpl_regfree if the replacement should be used.])
221 # Prerequisites of lib/regex.c and lib/regex_internal.c.
222 AC_DEFUN([gl_PREREQ_REGEX],
224 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
225 AC_REQUIRE([AC_C_INLINE])
226 AC_REQUIRE([AC_C_RESTRICT])
227 AC_REQUIRE([AC_TYPE_MBSTATE_T])
228 AC_CHECK_HEADERS([libintl.h])
229 AC_CHECK_FUNCS_ONCE([isblank iswctype wcscoll])
230 AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])