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#serial 23
# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
# Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
dnl Initially derived from code in GNU grep.
dnl Mostly written by Jim Meyering.
AC_DEFUN([gl_REGEX],
[
gl_INCLUDED_REGEX([lib/regex.c])
])
dnl Usage: gl_INCLUDED_REGEX([lib/regex.c])
dnl
AC_DEFUN([gl_INCLUDED_REGEX],
[
AC_LIBSOURCES(
[regcomp.c, regex.c, regex.h,
regex_internal.c, regex_internal.h, regexec.c])
dnl Even packages that don't use regex.c can use this macro.
dnl Of course, for them it doesn't do anything.
# Assume we'll default to using the included regex.c.
ac_use_included_regex=yes
# However, if the system regex support is good enough that it passes the
# the following run test, then default to *not* using the included regex.c.
# If cross compiling, assume the test would fail and use the included
# regex.c. The first failing regular expression is from `Spencer ere
# test #75' in grep-2.3.
AC_CACHE_CHECK([for working re_compile_pattern],
[gl_cv_func_working_re_compile_pattern],
[AC_TRY_RUN(
[[
#include <stdio.h>
#include <string.h>
#include <regex.h>
int
main ()
{
static struct re_pattern_buffer regex;
const char *s;
struct re_registers regs;
re_set_syntax (RE_SYNTAX_POSIX_EGREP);
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("a[:@:>@:]b\n", 9, ®ex);
/* This should fail with _Invalid character class name_ error. */
if (!s)
exit (1);
/* This should succeed, but does not for e.g. glibc-2.1.3. */
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("{1", 2, ®ex);
if (s)
exit (1);
/* The following example is derived from a problem report
against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("[an\371]*n", 7, ®ex);
if (s)
exit (1);
/* This should match, but does not for e.g. glibc-2.2.1. */
if (re_match (®ex, "an", 2, 0, ®s) != 2)
exit (1);
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("x", 1, ®ex);
if (s)
exit (1);
/* The version of regex.c in e.g. GNU libc-2.2.93 did not
work with a negative RANGE argument. */
if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
exit (1);
/* The version of regex.c in older versions of gnulib
* ignored RE_ICASE. Detect that problem too. */
memset (®ex, 0, sizeof (regex));
re_set_syntax(RE_SYNTAX_EMACS|RE_ICASE);
s = re_compile_pattern ("x", 1, ®ex);
if (s)
exit (1);
if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
exit (1);
/* REG_STARTEND was added to glibc on 2004-01-15.
Reject older versions. */
if (! REG_STARTEND)
exit (1);
exit (0);
}
]],
[gl_cv_func_working_re_compile_pattern=yes],
[gl_cv_func_working_re_compile_pattern=no],
dnl When crosscompiling, assume it is broken.
[gl_cv_func_working_re_compile_pattern=no])])
if test $gl_cv_func_working_re_compile_pattern = yes; then
ac_use_included_regex=no
fi
test -n "$1" || AC_MSG_ERROR([missing argument])
m4_syscmd([test -f '$1'])
ifelse(m4_sysval, 0,
[
AC_ARG_WITH([included-regex],
[ --without-included-regex don't compile regex; this is the default on
systems with recent-enough versions of the GNU C
Library (use with caution on other systems)],
[gl_with_regex=$withval],
[gl_with_regex=$ac_use_included_regex])
if test "X$gl_with_regex" = Xyes; then
AC_LIBOBJ([regex])
gl_PREREQ_REGEX
fi
],
)
]
)
# Prerequisites of lib/regex.c and lib/regex_internal.c.
AC_DEFUN([gl_PREREQ_REGEX],
[
AC_REQUIRE([gl_C_RESTRICT])
AC_REQUIRE([AM_LANGINFO_CODESET])
AC_CHECK_HEADERS_ONCE([locale.h wchar.h wctype.h])
AC_CHECK_FUNCS_ONCE([isblank mbrtowc mempcpy wcrtomb wcscoll])
])
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