Sync with gnulib - lots of extraneous code removed in preference to GNU code

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1580 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 198 insertions, 0 deletions

diff --git a/gl/m4/regex.m4 b/gl/m4/regex.m4
new file mode 100644
index 00000000..25da645e
--- /dev/null
+++ b/gl/m4/regex.m4
@@ -0,0 +1,198 @@
+#serial 42
+
+# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005,
+# 2006, 2007 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_PREREQ([2.50])
+
+AC_DEFUN([gl_REGEX],
+[
+  AC_CHECK_HEADERS_ONCE([locale.h])
+
+  AC_ARG_WITH([included-regex],
+    [AC_HELP_STRING([--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)])])
+
+  case $with_included_regex in #(
+  yes|no) ac_use_included_regex=$with_included_regex
+        ;;
+  '')
+    # If the system regex support is good enough that it passes 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_re_compile_pattern_working],
+      [AC_RUN_IFELSE(
+        [AC_LANG_PROGRAM(
+          [AC_INCLUDES_DEFAULT
+           #if HAVE_LOCALE_H
+            #include <locale.h>
+           #endif
+           #include <limits.h>
+           #include <regex.h>
+           ],
+          [[static struct re_pattern_buffer regex;
+            unsigned char folded_chars[UCHAR_MAX + 1];
+            int i;
+            const char *s;
+            struct re_registers regs;
+
+            #if HAVE_LOCALE_H
+              /* http://sourceware.org/ml/libc-hacker/2006-09/msg00008.html
+                 This test needs valgrind to catch the bug on Debian
+                 GNU/Linux 3.1 x86, but it might catch the bug better
+                 on other platforms and it shouldn't hurt to try the
+                 test here.  */
+              if (setlocale (LC_ALL, "en_US.UTF-8"))
+                {
+                  static char const pat[] = "insert into";
+                  static char const data[] =
+                    "\xFF\0\x12\xA2\xAA\xC4\xB1,K\x12\xC4\xB1*\xACK";
+                  re_set_syntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE
+                                 | RE_ICASE);
+                  memset (&regex, 0, sizeof regex);
+                  s = re_compile_pattern (pat, sizeof pat - 1, &regex);
+                  if (s)
+                    return 1;
+                  if (re_search (&regex, data, sizeof data - 1,
+                                 0, sizeof data - 1, &regs)
+                      != -1)
+                    return 1;
+                  if (! setlocale (LC_ALL, "C"))
+                    return 1;
+                }
+            #endif
+
+            re_set_syntax (RE_SYNTAX_POSIX_EGREP);
+            memset (&regex, 0, sizeof (regex));
+            for (i = 0; i <= UCHAR_MAX; i++)
+              folded_chars[i] = i;
+            regex.translate = folded_chars;
+            s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, &regex);
+            /* 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 (&regex, 0, sizeof (regex));
+            s = re_compile_pattern ("{1", 2, &regex);
+
+            if (s)
+              exit (1);
+
+            /* The following example is derived from a problem report
+               against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>.  */
+            memset (&regex, 0, sizeof (regex));
+            s = re_compile_pattern ("[an\371]*n", 7, &regex);
+            if (s)
+              exit (1);
+
+            /* This should match, but does not for e.g. glibc-2.2.1.  */
+            if (re_match (&regex, "an", 2, 0, &regs) != 2)
+              exit (1);
+
+            memset (&regex, 0, sizeof (regex));
+            s = re_compile_pattern ("x", 1, &regex);
+            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 (&regex, "wxy", 3, 2, -2, &regs) != 1)
+              exit (1);
+
+            /* The version of regex.c in older versions of gnulib
+               ignored RE_ICASE.  Detect that problem too.  */
+            memset (&regex, 0, sizeof (regex));
+            re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
+            s = re_compile_pattern ("x", 1, &regex);
+            if (s)
+              exit (1);
+
+            if (re_search (&regex, "WXY", 3, 0, 3, &regs) < 0)
+              exit (1);
+
+            /* REG_STARTEND was added to glibc on 2004-01-15.
+               Reject older versions.  */
+            if (! REG_STARTEND)
+              exit (1);
+
+            /* Reject hosts whose regoff_t values are too narrow.
+               These include glibc 2.3.5 on hosts with 64-bit ptrdiff_t
+               and 32-bit int.  */
+            if (sizeof (regoff_t) < sizeof (ptrdiff_t)
+                || sizeof (regoff_t) < sizeof (ssize_t))
+              exit (1);
+
+            exit (0);]])],
+       [gl_cv_func_re_compile_pattern_working=yes],
+       [gl_cv_func_re_compile_pattern_working=no],
+       dnl When crosscompiling, assume it is not working.
+       [gl_cv_func_re_compile_pattern_working=no])])
+    case $gl_cv_func_re_compile_pattern_working in #(
+    yes) ac_use_included_regex=no;; #(
+    no) ac_use_included_regex=yes;;
+    esac
+    ;;
+  *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
+    ;;
+  esac
+
+  if test $ac_use_included_regex = yes; then
+    AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
+      [Define if you want regoff_t to be at least as wide POSIX requires.])
+    AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
+      [Define to rpl_re_syntax_options if the replacement should be used.])
+    AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
+      [Define to rpl_re_set_syntax if the replacement should be used.])
+    AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
+      [Define to rpl_re_compile_pattern if the replacement should be used.])
+    AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
+      [Define to rpl_re_compile_fastmap if the replacement should be used.])
+    AC_DEFINE([re_search], [rpl_re_search],
+      [Define to rpl_re_search if the replacement should be used.])
+    AC_DEFINE([re_search_2], [rpl_re_search_2],
+      [Define to rpl_re_search_2 if the replacement should be used.])
+    AC_DEFINE([re_match], [rpl_re_match],
+      [Define to rpl_re_match if the replacement should be used.])
+    AC_DEFINE([re_match_2], [rpl_re_match_2],
+      [Define to rpl_re_match_2 if the replacement should be used.])
+    AC_DEFINE([re_set_registers], [rpl_re_set_registers],
+      [Define to rpl_re_set_registers if the replacement should be used.])
+    AC_DEFINE([re_comp], [rpl_re_comp],
+      [Define to rpl_re_comp if the replacement should be used.])
+    AC_DEFINE([re_exec], [rpl_re_exec],
+      [Define to rpl_re_exec if the replacement should be used.])
+    AC_DEFINE([regcomp], [rpl_regcomp],
+      [Define to rpl_regcomp if the replacement should be used.])
+    AC_DEFINE([regexec], [rpl_regexec],
+      [Define to rpl_regexec if the replacement should be used.])
+    AC_DEFINE([regerror], [rpl_regerror],
+      [Define to rpl_regerror if the replacement should be used.])
+    AC_DEFINE([regfree], [rpl_regfree],
+      [Define to rpl_regfree if the replacement should be used.])
+    AC_LIBOBJ([regex])
+    gl_PREREQ_REGEX
+  fi
+])
+
+# Prerequisites of lib/regex.c and lib/regex_internal.c.
+AC_DEFUN([gl_PREREQ_REGEX],
+[
+  AC_REQUIRE([AC_GNU_SOURCE])
+  AC_REQUIRE([AC_C_RESTRICT])
+  AC_REQUIRE([AM_LANGINFO_CODESET])
+  AC_CHECK_FUNCS_ONCE([iswctype mbrtowc mempcpy wcrtomb wcscoll])
+  AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])
+])