3 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005,
4 # 2006, 2007 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 [AC_HELP_STRING([--without-included-regex],
21 [don't compile regex; this is the default on 32-bit
22 systems with recent-enough versions of the GNU C
23 Library (use with caution on other systems).
24 On systems with 64-bit ptrdiff_t and 32-bit int,
25 --with-included-regex is the default, in case
26 regex functions operate on very long strings (>2GB)])])
28 case $with_included_regex in #(
29 yes|no) ac_use_included_regex=$with_included_regex
32 # If the system regex support is good enough that it passes the
33 # following run test, then default to *not* using the included regex.c.
34 # If cross compiling, assume the test would fail and use the included
36 AC_CACHE_CHECK([for working re_compile_pattern],
37 [gl_cv_func_re_compile_pattern_working],
47 [[static struct re_pattern_buffer regex;
48 unsigned char folded_chars[UCHAR_MAX + 1];
51 struct re_registers regs;
54 /* http://sourceware.org/ml/libc-hacker/2006-09/msg00008.html
55 This test needs valgrind to catch the bug on Debian
56 GNU/Linux 3.1 x86, but it might catch the bug better
57 on other platforms and it shouldn't hurt to try the
59 if (setlocale (LC_ALL, "en_US.UTF-8"))
61 static char const pat[] = "insert into";
62 static char const data[] =
63 "\xFF\0\x12\xA2\xAA\xC4\xB1,K\x12\xC4\xB1*\xACK";
64 re_set_syntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE
66 memset (®ex, 0, sizeof regex);
67 s = re_compile_pattern (pat, sizeof pat - 1, ®ex);
70 if (re_search (®ex, data, sizeof data - 1,
71 0, sizeof data - 1, ®s)
74 if (! setlocale (LC_ALL, "C"))
79 /* This test is from glibc bug 3957, reported by Andrew Mackey. */
80 re_set_syntax (RE_SYNTAX_EGREP | RE_HAT_LISTS_NOT_NEWLINE);
81 memset (®ex, 0, sizeof regex);
82 s = re_compile_pattern ("a[^x]b", 6, ®ex);
86 /* This should fail, but succeeds for glibc-2.5. */
87 if (re_search (®ex, "a\nb", 3, 0, 3, ®s) != -1)
90 /* This regular expression is from Spencer ere test number 75
92 re_set_syntax (RE_SYNTAX_POSIX_EGREP);
93 memset (®ex, 0, sizeof regex);
94 for (i = 0; i <= UCHAR_MAX; i++)
96 regex.translate = folded_chars;
97 s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, ®ex);
98 /* This should fail with _Invalid character class name_ error. */
102 /* This should succeed, but does not for glibc-2.1.3. */
103 memset (®ex, 0, sizeof regex);
104 s = re_compile_pattern ("{1", 2, ®ex);
109 /* The following example is derived from a problem report
110 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
111 memset (®ex, 0, sizeof regex);
112 s = re_compile_pattern ("[an\371]*n", 7, ®ex);
116 /* This should match, but does not for glibc-2.2.1. */
117 if (re_match (®ex, "an", 2, 0, ®s) != 2)
120 memset (®ex, 0, sizeof regex);
121 s = re_compile_pattern ("x", 1, ®ex);
125 /* glibc-2.2.93 does not work with a negative RANGE argument. */
126 if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
129 /* The version of regex.c in older versions of gnulib
130 ignored RE_ICASE. Detect that problem too. */
131 re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
132 memset (®ex, 0, sizeof regex);
133 s = re_compile_pattern ("x", 1, ®ex);
137 if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
140 /* REG_STARTEND was added to glibc on 2004-01-15.
141 Reject older versions. */
145 /* Reject hosts whose regoff_t values are too narrow.
146 These include glibc 2.3.5 on hosts with 64-bit ptrdiff_t
148 if (sizeof (regoff_t) < sizeof (ptrdiff_t)
149 || sizeof (regoff_t) < sizeof (ssize_t))
153 [gl_cv_func_re_compile_pattern_working=yes],
154 [gl_cv_func_re_compile_pattern_working=no],
155 dnl When crosscompiling, assume it is not working.
156 [gl_cv_func_re_compile_pattern_working=no])])
157 case $gl_cv_func_re_compile_pattern_working in #(
158 yes) ac_use_included_regex=no;; #(
159 no) ac_use_included_regex=yes;;
162 *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
166 if test $ac_use_included_regex = yes; then
167 AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
168 [Define if you want regoff_t to be at least as wide POSIX requires.])
169 AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
170 [Define to rpl_re_syntax_options if the replacement should be used.])
171 AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
172 [Define to rpl_re_set_syntax if the replacement should be used.])
173 AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
174 [Define to rpl_re_compile_pattern if the replacement should be used.])
175 AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
176 [Define to rpl_re_compile_fastmap if the replacement should be used.])
177 AC_DEFINE([re_search], [rpl_re_search],
178 [Define to rpl_re_search if the replacement should be used.])
179 AC_DEFINE([re_search_2], [rpl_re_search_2],
180 [Define to rpl_re_search_2 if the replacement should be used.])
181 AC_DEFINE([re_match], [rpl_re_match],
182 [Define to rpl_re_match if the replacement should be used.])
183 AC_DEFINE([re_match_2], [rpl_re_match_2],
184 [Define to rpl_re_match_2 if the replacement should be used.])
185 AC_DEFINE([re_set_registers], [rpl_re_set_registers],
186 [Define to rpl_re_set_registers if the replacement should be used.])
187 AC_DEFINE([re_comp], [rpl_re_comp],
188 [Define to rpl_re_comp if the replacement should be used.])
189 AC_DEFINE([re_exec], [rpl_re_exec],
190 [Define to rpl_re_exec if the replacement should be used.])
191 AC_DEFINE([regcomp], [rpl_regcomp],
192 [Define to rpl_regcomp if the replacement should be used.])
193 AC_DEFINE([regexec], [rpl_regexec],
194 [Define to rpl_regexec if the replacement should be used.])
195 AC_DEFINE([regerror], [rpl_regerror],
196 [Define to rpl_regerror if the replacement should be used.])
197 AC_DEFINE([regfree], [rpl_regfree],
198 [Define to rpl_regfree if the replacement should be used.])
204 # Prerequisites of lib/regex.c and lib/regex_internal.c.
205 AC_DEFUN([gl_PREREQ_REGEX],
207 AC_REQUIRE([AC_GNU_SOURCE])
208 AC_REQUIRE([AC_C_RESTRICT])
209 AC_CHECK_FUNCS_ONCE([iswctype mbrtowc wcrtomb wcscoll])
210 AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])