| 1 | # serial 61
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| 2 |
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| 3 | # Copyright (C) 1996-2001, 2003-2012 Free Software Foundation, Inc.
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| 4 | #
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| 5 | # This file is free software; the Free Software Foundation
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| 6 | # gives unlimited permission to copy and/or distribute it,
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| 7 | # with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | dnl Initially derived from code in GNU grep.
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| 10 | dnl Mostly written by Jim Meyering.
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| 11 |
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| 12 | AC_PREREQ([2.50])
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| 13 |
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| 14 | AC_DEFUN([gl_REGEX],
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| 15 | [
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| 16 | AC_ARG_WITH([included-regex],
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| 17 | [AS_HELP_STRING([--without-included-regex],
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| 18 | [don't compile regex; this is the default on systems
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| 19 | with recent-enough versions of the GNU C Library
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| 20 | (use with caution on other systems).])])
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| 21 |
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| 22 | case $with_included_regex in #(
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| 23 | yes|no) ac_use_included_regex=$with_included_regex
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| 24 | ;;
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| 25 | '')
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| 26 | # If the system regex support is good enough that it passes the
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| 27 | # following run test, then default to *not* using the included regex.c.
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| 28 | # If cross compiling, assume the test would fail and use the included
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| 29 | # regex.c.
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| 30 | AC_CACHE_CHECK([for working re_compile_pattern],
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| 31 | [gl_cv_func_re_compile_pattern_working],
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| 32 | [AC_RUN_IFELSE(
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| 33 | [AC_LANG_PROGRAM(
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| 34 | [AC_INCLUDES_DEFAULT[
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| 35 | #include <locale.h>
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| 36 | #include <limits.h>
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| 37 | #include <regex.h>
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| 38 | ]],
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| 39 | [[int result = 0;
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| 40 | static struct re_pattern_buffer regex;
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| 41 | unsigned char folded_chars[UCHAR_MAX + 1];
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| 42 | int i;
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| 43 | const char *s;
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| 44 | struct re_registers regs;
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| 45 |
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| 46 | /* http://sourceware.org/ml/libc-hacker/2006-09/msg00008.html
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| 47 | This test needs valgrind to catch the bug on Debian
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| 48 | GNU/Linux 3.1 x86, but it might catch the bug better
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| 49 | on other platforms and it shouldn't hurt to try the
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| 50 | test here. */
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| 51 | if (setlocale (LC_ALL, "en_US.UTF-8"))
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| 52 | {
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| 53 | static char const pat[] = "insert into";
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| 54 | static char const data[] =
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| 55 | "\xFF\0\x12\xA2\xAA\xC4\xB1,K\x12\xC4\xB1*\xACK";
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| 56 | re_set_syntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE
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| 57 | | RE_ICASE);
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| 58 | memset (®ex, 0, sizeof regex);
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| 59 | s = re_compile_pattern (pat, sizeof pat - 1, ®ex);
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| 60 | if (s)
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| 61 | result |= 1;
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| 62 | else if (re_search (®ex, data, sizeof data - 1,
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| 63 | 0, sizeof data - 1, ®s)
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| 64 | != -1)
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| 65 | result |= 1;
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| 66 | if (! setlocale (LC_ALL, "C"))
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| 67 | return 1;
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| 68 | }
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| 69 |
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| 70 | /* This test is from glibc bug 3957, reported by Andrew Mackey. */
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| 71 | re_set_syntax (RE_SYNTAX_EGREP | RE_HAT_LISTS_NOT_NEWLINE);
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| 72 | memset (®ex, 0, sizeof regex);
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| 73 | s = re_compile_pattern ("a[^x]b", 6, ®ex);
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| 74 | if (s)
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| 75 | result |= 2;
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| 76 | /* This should fail, but succeeds for glibc-2.5. */
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| 77 | else if (re_search (®ex, "a\nb", 3, 0, 3, ®s) != -1)
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| 78 | result |= 2;
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| 79 |
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| 80 | /* This regular expression is from Spencer ere test number 75
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| 81 | in grep-2.3. */
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| 82 | re_set_syntax (RE_SYNTAX_POSIX_EGREP);
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| 83 | memset (®ex, 0, sizeof regex);
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| 84 | for (i = 0; i <= UCHAR_MAX; i++)
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| 85 | folded_chars[i] = i;
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| 86 | regex.translate = folded_chars;
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| 87 | s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, ®ex);
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| 88 | /* This should fail with _Invalid character class name_ error. */
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| 89 | if (!s)
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| 90 | result |= 4;
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| 91 |
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| 92 | /* Ensure that [b-a] is diagnosed as invalid, when
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| 93 | using RE_NO_EMPTY_RANGES. */
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| 94 | re_set_syntax (RE_SYNTAX_POSIX_EGREP | RE_NO_EMPTY_RANGES);
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| 95 | memset (®ex, 0, sizeof regex);
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| 96 | s = re_compile_pattern ("a[b-a]", 6, ®ex);
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| 97 | if (s == 0)
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| 98 | result |= 8;
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| 99 |
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| 100 | /* This should succeed, but does not for glibc-2.1.3. */
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| 101 | memset (®ex, 0, sizeof regex);
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| 102 | s = re_compile_pattern ("{1", 2, ®ex);
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| 103 | if (s)
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| 104 | result |= 8;
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| 105 |
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| 106 | /* The following example is derived from a problem report
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| 107 | against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
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| 108 | memset (®ex, 0, sizeof regex);
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| 109 | s = re_compile_pattern ("[an\371]*n", 7, ®ex);
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| 110 | if (s)
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| 111 | result |= 8;
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| 112 | /* This should match, but does not for glibc-2.2.1. */
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| 113 | else if (re_match (®ex, "an", 2, 0, ®s) != 2)
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| 114 | result |= 8;
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| 115 |
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| 116 | memset (®ex, 0, sizeof regex);
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| 117 | s = re_compile_pattern ("x", 1, ®ex);
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| 118 | if (s)
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| 119 | result |= 8;
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| 120 | /* glibc-2.2.93 does not work with a negative RANGE argument. */
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| 121 | else if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
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| 122 | result |= 8;
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| 123 |
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| 124 | /* The version of regex.c in older versions of gnulib
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| 125 | ignored RE_ICASE. Detect that problem too. */
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| 126 | re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
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| 127 | memset (®ex, 0, sizeof regex);
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| 128 | s = re_compile_pattern ("x", 1, ®ex);
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| 129 | if (s)
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| 130 | result |= 16;
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| 131 | else if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
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| 132 | result |= 16;
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| 133 |
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| 134 | /* Catch a bug reported by Vin Shelton in
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| 135 | http://lists.gnu.org/archive/html/bug-coreutils/2007-06/msg00089.html
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| 136 | */
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| 137 | re_set_syntax (RE_SYNTAX_POSIX_BASIC
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| 138 | & ~RE_CONTEXT_INVALID_DUP
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| 139 | & ~RE_NO_EMPTY_RANGES);
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| 140 | memset (®ex, 0, sizeof regex);
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| 141 | s = re_compile_pattern ("[[:alnum:]_-]\\\\+$", 16, ®ex);
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| 142 | if (s)
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| 143 | result |= 32;
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| 144 |
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| 145 | /* REG_STARTEND was added to glibc on 2004-01-15.
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| 146 | Reject older versions. */
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| 147 | if (! REG_STARTEND)
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| 148 | result |= 64;
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| 149 |
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| 150 | #if 0
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| 151 | /* It would be nice to reject hosts whose regoff_t values are too
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| 152 | narrow (including glibc on hosts with 64-bit ptrdiff_t and
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| 153 | 32-bit int), but we should wait until glibc implements this
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| 154 | feature. Otherwise, support for equivalence classes and
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| 155 | multibyte collation symbols would always be broken except
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| 156 | when compiling --without-included-regex. */
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| 157 | if (sizeof (regoff_t) < sizeof (ptrdiff_t)
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| 158 | || sizeof (regoff_t) < sizeof (ssize_t))
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| 159 | result |= 64;
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| 160 | #endif
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| 161 |
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| 162 | return result;
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| 163 | ]])],
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| 164 | [gl_cv_func_re_compile_pattern_working=yes],
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| 165 | [gl_cv_func_re_compile_pattern_working=no],
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| 166 | dnl When crosscompiling, assume it is not working.
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| 167 | [gl_cv_func_re_compile_pattern_working=no])])
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| 168 | case $gl_cv_func_re_compile_pattern_working in #(
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| 169 | yes) ac_use_included_regex=no;; #(
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| 170 | no) ac_use_included_regex=yes;;
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| 171 | esac
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| 172 | ;;
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| 173 | *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
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| 174 | ;;
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| 175 | esac
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| 176 |
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| 177 | if test $ac_use_included_regex = yes; then
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| 178 | AC_DEFINE([_REGEX_INCLUDE_LIMITS_H], [1],
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| 179 | [Define if you want <regex.h> to include <limits.h>, so that it
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| 180 | consistently overrides <limits.h>'s RE_DUP_MAX.])
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| 181 | AC_DEFINE([_REGEX_LARGE_OFFSETS], [1],
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| 182 | [Define if you want regoff_t to be at least as wide POSIX requires.])
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| 183 | AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
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| 184 | [Define to rpl_re_syntax_options if the replacement should be used.])
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| 185 | AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
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| 186 | [Define to rpl_re_set_syntax if the replacement should be used.])
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| 187 | AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
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| 188 | [Define to rpl_re_compile_pattern if the replacement should be used.])
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| 189 | AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
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| 190 | [Define to rpl_re_compile_fastmap if the replacement should be used.])
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| 191 | AC_DEFINE([re_search], [rpl_re_search],
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| 192 | [Define to rpl_re_search if the replacement should be used.])
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| 193 | AC_DEFINE([re_search_2], [rpl_re_search_2],
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| 194 | [Define to rpl_re_search_2 if the replacement should be used.])
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| 195 | AC_DEFINE([re_match], [rpl_re_match],
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| 196 | [Define to rpl_re_match if the replacement should be used.])
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| 197 | AC_DEFINE([re_match_2], [rpl_re_match_2],
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| 198 | [Define to rpl_re_match_2 if the replacement should be used.])
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| 199 | AC_DEFINE([re_set_registers], [rpl_re_set_registers],
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| 200 | [Define to rpl_re_set_registers if the replacement should be used.])
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| 201 | AC_DEFINE([re_comp], [rpl_re_comp],
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| 202 | [Define to rpl_re_comp if the replacement should be used.])
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| 203 | AC_DEFINE([re_exec], [rpl_re_exec],
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| 204 | [Define to rpl_re_exec if the replacement should be used.])
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| 205 | AC_DEFINE([regcomp], [rpl_regcomp],
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| 206 | [Define to rpl_regcomp if the replacement should be used.])
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| 207 | AC_DEFINE([regexec], [rpl_regexec],
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| 208 | [Define to rpl_regexec if the replacement should be used.])
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| 209 | AC_DEFINE([regerror], [rpl_regerror],
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| 210 | [Define to rpl_regerror if the replacement should be used.])
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| 211 | AC_DEFINE([regfree], [rpl_regfree],
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| 212 | [Define to rpl_regfree if the replacement should be used.])
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| 213 | fi
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| 214 | ])
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| 215 |
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| 216 | # Prerequisites of lib/regex.c and lib/regex_internal.c.
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| 217 | AC_DEFUN([gl_PREREQ_REGEX],
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| 218 | [
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| 219 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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| 220 | AC_REQUIRE([AC_C_INLINE])
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| 221 | AC_REQUIRE([AC_C_RESTRICT])
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| 222 | AC_REQUIRE([AC_TYPE_MBSTATE_T])
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| 223 | AC_CHECK_HEADERS([libintl.h])
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| 224 | AC_CHECK_FUNCS_ONCE([isblank iswctype wcscoll])
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| 225 | AC_CHECK_DECLS([isblank], [], [], [[#include <ctype.h>]])
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| 226 | ])
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