"Fossies" - the Fresh Open Source Software Archive

Member "rush-1.9/m4/regex.m4" (19 Apr 2019, 12789 Bytes) of package /linux/privat/rush-1.9.tar.xz:


As a special service "Fossies" has tried to format the requested text file into HTML format (style: standard) with prefixed line numbers. Alternatively you can here view or download the uninterpreted source code file. See also the latest Fossies "Diffs" side-by-side code changes report for "regex.m4": 1.8_vs_1.9.

    1 # serial 68
    2 
    3 # Copyright (C) 1996-2001, 2003-2019 Free Software Foundation, Inc.
    4 #
    5 # This file is free software; the Free Software Foundation
    6 # gives unlimited permission to copy and/or distribute it,
    7 # with or without modifications, as long as this notice is preserved.
    8 
    9 dnl Initially derived from code in GNU grep.
   10 dnl Mostly written by Jim Meyering.
   11 
   12 AC_PREREQ([2.50])
   13 
   14 AC_DEFUN([gl_REGEX],
   15 [
   16   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   17   AC_ARG_WITH([included-regex],
   18     [AS_HELP_STRING([--without-included-regex],
   19                     [don't compile regex; this is the default on systems
   20                      with recent-enough versions of the GNU C Library
   21                      (use with caution on other systems).])])
   22 
   23   case $with_included_regex in #(
   24   yes|no) ac_use_included_regex=$with_included_regex
   25         ;;
   26   '')
   27     # If the system regex support is good enough that it passes the
   28     # following run test, then default to *not* using the included regex.c.
   29     # If cross compiling, assume the test would fail and use the included
   30     # regex.c.
   31     AC_CHECK_DECLS_ONCE([alarm])
   32     AC_CHECK_HEADERS_ONCE([malloc.h])
   33     AC_CACHE_CHECK([for working re_compile_pattern],
   34                    [gl_cv_func_re_compile_pattern_working],
   35       [AC_RUN_IFELSE(
   36         [AC_LANG_PROGRAM(
   37           [[#include <regex.h>
   38 
   39             #include <locale.h>
   40             #include <limits.h>
   41             #include <string.h>
   42 
   43             #if defined M_CHECK_ACTION || HAVE_DECL_ALARM
   44             # include <signal.h>
   45             # include <unistd.h>
   46             #endif
   47 
   48             #if HAVE_MALLOC_H
   49             # include <malloc.h>
   50             #endif
   51 
   52             #ifdef M_CHECK_ACTION
   53             /* Exit with distinguishable exit code.  */
   54             static void sigabrt_no_core (int sig) { raise (SIGTERM); }
   55             #endif
   56           ]],
   57           [[int result = 0;
   58             static struct re_pattern_buffer regex;
   59             unsigned char folded_chars[UCHAR_MAX + 1];
   60             int i;
   61             const char *s;
   62             struct re_registers regs;
   63 
   64             /* Some builds of glibc go into an infinite loop on this
   65                test.  Use alarm to force death, and mallopt to avoid
   66                malloc recursion in diagnosing the corrupted heap. */
   67 #if HAVE_DECL_ALARM
   68             signal (SIGALRM, SIG_DFL);
   69             alarm (2);
   70 #endif
   71 #ifdef M_CHECK_ACTION
   72             signal (SIGABRT, sigabrt_no_core);
   73             mallopt (M_CHECK_ACTION, 2);
   74 #endif
   75 
   76             if (setlocale (LC_ALL, "en_US.UTF-8"))
   77               {
   78                 {
   79                   /* https://sourceware.org/ml/libc-hacker/2006-09/msg00008.html
   80                      This test needs valgrind to catch the bug on Debian
   81                      GNU/Linux 3.1 x86, but it might catch the bug better
   82                      on other platforms and it shouldn't hurt to try the
   83                      test here.  */
   84                   static char const pat[] = "insert into";
   85                   static char const data[] =
   86                     "\xFF\0\x12\xA2\xAA\xC4\xB1,K\x12\xC4\xB1*\xACK";
   87                   re_set_syntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE
   88                                  | RE_ICASE);
   89                   memset (&regex, 0, sizeof regex);
   90                   s = re_compile_pattern (pat, sizeof pat - 1, &regex);
   91                   if (s)
   92                     result |= 1;
   93                   else if (re_search (&regex, data, sizeof data - 1,
   94                                       0, sizeof data - 1, &regs)
   95                            != -1)
   96                     result |= 1;
   97                   regfree (&regex);
   98                 }
   99 
  100                 {
  101                   /* This test is from glibc bug 15078.
  102                      The test case is from Andreas Schwab in
  103                      <https://sourceware.org/ml/libc-alpha/2013-01/msg00967.html>.
  104                      */
  105                   static char const pat[] = "[^x]x";
  106                   static char const data[] =
  107                     /* <U1000><U103B><U103D><U1014><U103A><U102F><U1015><U103A> */
  108                     "\xe1\x80\x80"
  109                     "\xe1\x80\xbb"
  110                     "\xe1\x80\xbd"
  111                     "\xe1\x80\x94"
  112                     "\xe1\x80\xba"
  113                     "\xe1\x80\xaf"
  114                     "\xe1\x80\x95"
  115                     "\xe1\x80\xba"
  116                     "x";
  117                   re_set_syntax (0);
  118                   memset (&regex, 0, sizeof regex);
  119                   s = re_compile_pattern (pat, sizeof pat - 1, &regex);
  120                   if (s)
  121                     result |= 1;
  122                   else
  123                     {
  124                       i = re_search (&regex, data, sizeof data - 1,
  125                                      0, sizeof data - 1, 0);
  126                       if (i != 0 && i != 21)
  127                         result |= 1;
  128                     }
  129                   regfree (&regex);
  130                 }
  131 
  132                 if (! setlocale (LC_ALL, "C"))
  133                   return 1;
  134               }
  135 
  136             /* This test is from glibc bug 3957, reported by Andrew Mackey.  */
  137             re_set_syntax (RE_SYNTAX_EGREP | RE_HAT_LISTS_NOT_NEWLINE);
  138             memset (&regex, 0, sizeof regex);
  139             s = re_compile_pattern ("a[^x]b", 6, &regex);
  140             if (s)
  141               result |= 2;
  142             /* This should fail, but succeeds for glibc-2.5.  */
  143             else if (re_search (&regex, "a\nb", 3, 0, 3, &regs) != -1)
  144               result |= 2;
  145 
  146             /* This regular expression is from Spencer ere test number 75
  147                in grep-2.3.  */
  148             re_set_syntax (RE_SYNTAX_POSIX_EGREP);
  149             memset (&regex, 0, sizeof regex);
  150             for (i = 0; i <= UCHAR_MAX; i++)
  151               folded_chars[i] = i;
  152             regex.translate = folded_chars;
  153             s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, &regex);
  154             /* This should fail with _Invalid character class name_ error.  */
  155             if (!s)
  156               result |= 4;
  157 
  158             /* Ensure that [b-a] is diagnosed as invalid, when
  159                using RE_NO_EMPTY_RANGES. */
  160             re_set_syntax (RE_SYNTAX_POSIX_EGREP | RE_NO_EMPTY_RANGES);
  161             memset (&regex, 0, sizeof regex);
  162             s = re_compile_pattern ("a[b-a]", 6, &regex);
  163             if (s == 0)
  164               result |= 8;
  165 
  166             /* This should succeed, but does not for glibc-2.1.3.  */
  167             memset (&regex, 0, sizeof regex);
  168             s = re_compile_pattern ("{1", 2, &regex);
  169             if (s)
  170               result |= 8;
  171 
  172             /* The following example is derived from a problem report
  173                against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>.  */
  174             memset (&regex, 0, sizeof regex);
  175             s = re_compile_pattern ("[an\371]*n", 7, &regex);
  176             if (s)
  177               result |= 8;
  178             /* This should match, but does not for glibc-2.2.1.  */
  179             else if (re_match (&regex, "an", 2, 0, &regs) != 2)
  180               result |= 8;
  181 
  182             memset (&regex, 0, sizeof regex);
  183             s = re_compile_pattern ("x", 1, &regex);
  184             if (s)
  185               result |= 8;
  186             /* glibc-2.2.93 does not work with a negative RANGE argument.  */
  187             else if (re_search (&regex, "wxy", 3, 2, -2, &regs) != 1)
  188               result |= 8;
  189 
  190             /* The version of regex.c in older versions of gnulib
  191                ignored RE_ICASE.  Detect that problem too.  */
  192             re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
  193             memset (&regex, 0, sizeof regex);
  194             s = re_compile_pattern ("x", 1, &regex);
  195             if (s)
  196               result |= 16;
  197             else if (re_search (&regex, "WXY", 3, 0, 3, &regs) < 0)
  198               result |= 16;
  199 
  200             /* Catch a bug reported by Vin Shelton in
  201                https://lists.gnu.org/r/bug-coreutils/2007-06/msg00089.html
  202                */
  203             re_set_syntax (RE_SYNTAX_POSIX_BASIC
  204                            & ~RE_CONTEXT_INVALID_DUP
  205                            & ~RE_NO_EMPTY_RANGES);
  206             memset (&regex, 0, sizeof regex);
  207             s = re_compile_pattern ("[[:alnum:]_-]\\\\+$", 16, &regex);
  208             if (s)
  209               result |= 32;
  210 
  211             /* REG_STARTEND was added to glibc on 2004-01-15.
  212                Reject older versions.  */
  213             if (! REG_STARTEND)
  214               result |= 64;
  215 
  216             /* Matching with the compiled form of this regexp would provoke
  217                an assertion failure prior to glibc-2.28:
  218                  regexec.c:1375: pop_fail_stack: Assertion 'num >= 0' failed
  219                With glibc-2.28, compilation fails and reports the invalid
  220                back reference.  */
  221             re_set_syntax (RE_SYNTAX_POSIX_EGREP);
  222             memset (&regex, 0, sizeof regex);
  223             s = re_compile_pattern ("0|()0|\\1|0", 10, &regex);
  224             if (!s || strcmp (s, "Invalid back reference"))
  225               result |= 64;
  226 
  227 #if 0
  228             /* It would be nice to reject hosts whose regoff_t values are too
  229                narrow (including glibc on hosts with 64-bit ptrdiff_t and
  230                32-bit int), but we should wait until glibc implements this
  231                feature.  Otherwise, support for equivalence classes and
  232                multibyte collation symbols would always be broken except
  233                when compiling --without-included-regex.   */
  234             if (sizeof (regoff_t) < sizeof (ptrdiff_t)
  235                 || sizeof (regoff_t) < sizeof (ssize_t))
  236               result |= 64;
  237 #endif
  238 
  239             return result;
  240           ]])],
  241         [gl_cv_func_re_compile_pattern_working=yes],
  242         [gl_cv_func_re_compile_pattern_working=no],
  243         [case "$host_os" in
  244                    # Guess no on native Windows.
  245            mingw*) gl_cv_func_re_compile_pattern_working="guessing no" ;;
  246                    # Otherwise, assume it is not working.
  247            *)      gl_cv_func_re_compile_pattern_working="guessing no" ;;
  248          esac
  249         ])
  250       ])
  251     case "$gl_cv_func_re_compile_pattern_working" in #(
  252       *yes) ac_use_included_regex=no;; #(
  253       *no) ac_use_included_regex=yes;;
  254     esac
  255     ;;
  256   *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
  257     ;;
  258   esac
  259 
  260   if test $ac_use_included_regex = yes; then
  261     AC_DEFINE([_REGEX_INCLUDE_LIMITS_H], [1],
  262       [Define if you want <regex.h> to include <limits.h>, so that it
  263        consistently overrides <limits.h>'s RE_DUP_MAX.])
  264     AC_DEFINE([_REGEX_LARGE_OFFSETS], [1],
  265       [Define if you want regoff_t to be at least as wide POSIX requires.])
  266     AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
  267       [Define to rpl_re_syntax_options if the replacement should be used.])
  268     AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
  269       [Define to rpl_re_set_syntax if the replacement should be used.])
  270     AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
  271       [Define to rpl_re_compile_pattern if the replacement should be used.])
  272     AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
  273       [Define to rpl_re_compile_fastmap if the replacement should be used.])
  274     AC_DEFINE([re_search], [rpl_re_search],
  275       [Define to rpl_re_search if the replacement should be used.])
  276     AC_DEFINE([re_search_2], [rpl_re_search_2],
  277       [Define to rpl_re_search_2 if the replacement should be used.])
  278     AC_DEFINE([re_match], [rpl_re_match],
  279       [Define to rpl_re_match if the replacement should be used.])
  280     AC_DEFINE([re_match_2], [rpl_re_match_2],
  281       [Define to rpl_re_match_2 if the replacement should be used.])
  282     AC_DEFINE([re_set_registers], [rpl_re_set_registers],
  283       [Define to rpl_re_set_registers if the replacement should be used.])
  284     AC_DEFINE([re_comp], [rpl_re_comp],
  285       [Define to rpl_re_comp if the replacement should be used.])
  286     AC_DEFINE([re_exec], [rpl_re_exec],
  287       [Define to rpl_re_exec if the replacement should be used.])
  288     AC_DEFINE([regcomp], [rpl_regcomp],
  289       [Define to rpl_regcomp if the replacement should be used.])
  290     AC_DEFINE([regexec], [rpl_regexec],
  291       [Define to rpl_regexec if the replacement should be used.])
  292     AC_DEFINE([regerror], [rpl_regerror],
  293       [Define to rpl_regerror if the replacement should be used.])
  294     AC_DEFINE([regfree], [rpl_regfree],
  295       [Define to rpl_regfree if the replacement should be used.])
  296   fi
  297 ])
  298 
  299 # Prerequisites of lib/regex.c and lib/regex_internal.c.
  300 AC_DEFUN([gl_PREREQ_REGEX],
  301 [
  302   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  303   AC_REQUIRE([AC_C_INLINE])
  304   AC_REQUIRE([AC_C_RESTRICT])
  305   AC_REQUIRE([AC_TYPE_MBSTATE_T])
  306   AC_REQUIRE([gl_EEMALLOC])
  307   AC_REQUIRE([gl_GLIBC21])
  308   AC_CHECK_HEADERS([libintl.h])
  309   AC_CHECK_FUNCS_ONCE([isblank iswctype])
  310   AC_CHECK_DECLS([isblank], [], [], [[#include <ctype.h>]])
  311 ])