1#serial 24 2 3dnl Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2006 Free 4dnl Software Foundation, Inc. 5dnl 6dnl This file is free software; the Free Software Foundation 7dnl gives unlimited permission to copy and/or distribute it, 8dnl with or without modifications, as long as this notice is preserved. 9 10dnl Initially derived from code in GNU grep. 11dnl Mostly written by Jim Meyering. 12 13AC_DEFUN([gl_REGEX], 14[ 15 gl_INCLUDED_REGEX([lib/regex.c]) 16]) 17 18dnl Usage: gl_INCLUDED_REGEX([lib/regex.c]) 19dnl 20AC_DEFUN([gl_INCLUDED_REGEX], 21 [ 22 dnl Even packages that don't use regex.c can use this macro. 23 dnl Of course, for them it doesn't do anything. 24 25 # Assume we'll default to using the included regex.c. 26 ac_use_included_regex=yes 27 28 # However, if the system regex support is good enough that it passes the 29 # the 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 31 # regex.c. The first failing regular expression is from `Spencer ere 32 # test #75' in grep-2.3. 33 AC_CACHE_CHECK([for working re_compile_pattern], 34 jm_cv_func_working_re_compile_pattern, 35 [AC_TRY_RUN( 36[#include <stdio.h> 37#include <stdlib.h> 38#include <string.h> 39#include <regex.h> 40 int 41 main () 42 { 43 static struct re_pattern_buffer regex; 44 const char *s; 45 struct re_registers regs; 46 re_set_syntax (RE_SYNTAX_POSIX_EGREP); 47 memset (®ex, 0, sizeof (regex)); 48 [s = re_compile_pattern ("a[[:@:>@:]]b\n", 9, ®ex);] 49 /* This should fail with _Invalid character class name_ error. */ 50 if (!s) 51 exit (1); 52 53 /* This should succeed, but doesn't for e.g. glibc-2.1.3. */ 54 memset (®ex, 0, sizeof (regex)); 55 s = re_compile_pattern ("{1", 2, ®ex); 56 57 if (s) 58 exit (1); 59 60 /* The following example is derived from a problem report 61 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */ 62 memset (®ex, 0, sizeof (regex)); 63 s = re_compile_pattern ("[[an\371]]*n", 7, ®ex); 64 if (s) 65 exit (1); 66 67 /* This should match, but doesn't for e.g. glibc-2.2.1. */ 68 if (re_match (®ex, "an", 2, 0, ®s) != 2) 69 exit (1); 70 71 memset (®ex, 0, sizeof (regex)); 72 s = re_compile_pattern ("x", 1, ®ex); 73 if (s) 74 exit (1); 75 76 /* The version of regex.c in e.g. GNU libc-2.2.93 didn't 77 work with a negative RANGE argument. */ 78 if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1) 79 exit (1); 80 81 exit (0); 82 } 83 ], 84 jm_cv_func_working_re_compile_pattern=yes, 85 jm_cv_func_working_re_compile_pattern=no, 86 dnl When crosscompiling, assume it's broken. 87 jm_cv_func_working_re_compile_pattern=no)]) 88 if test $jm_cv_func_working_re_compile_pattern = yes; then 89 ac_use_included_regex=no 90 fi 91 92 test -n "$1" || AC_MSG_ERROR([missing argument]) 93 m4_syscmd([test -f $1]) 94 ifelse(m4_sysval, 0, 95 [ 96 AC_ARG_WITH(included-regex, 97 [ --without-included-regex don't compile regex; this is the default on 98 systems with version 2 of the GNU C library 99 (use with caution on other system)], 100 jm_with_regex=$withval, 101 jm_with_regex=$ac_use_included_regex) 102 if test "$jm_with_regex" = yes; then 103 AC_LIBOBJ(regex) 104 gl_PREREQ_REGEX 105 fi 106 ], 107 ) 108 ] 109) 110 111# Prerequisites of lib/regex.c. 112AC_DEFUN([gl_PREREQ_REGEX], 113[ 114 dnl FIXME: Maybe provide a btowc replacement someday: Solaris 2.5.1 lacks it. 115 dnl FIXME: Check for wctype and iswctype, and and add -lw if necessary 116 dnl to get them. 117 118 dnl Persuade glibc <string.h> to declare mempcpy(). 119 AC_REQUIRE([AC_GNU_SOURCE]) 120 121 AC_REQUIRE([AC_C_RESTRICT]) 122 AC_REQUIRE([AC_FUNC_ALLOCA]) 123 AC_REQUIRE([AC_HEADER_STDC]) 124 AC_CHECK_HEADERS_ONCE(wchar.h wctype.h) 125 AC_CHECK_FUNCS_ONCE(isascii mempcpy) 126 AC_CHECK_FUNCS(btowc) 127]) 128