kc3-lang/gnulib/tests/test-regex.c

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  Date : 2025-01-01T09:24:36
  

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• tests/test-regex.c

• /* Test regular expressions
     Copyright 1996-2001, 2003-2025 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  #include "regex.h"
  
  #include <locale.h>
  #include <limits.h>
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <wctype.h>
  #if HAVE_DECL_ALARM
  # include <unistd.h>
  # include <signal.h>
  #endif
  
  #include "localcharset.h"
  
  static int exit_status;
  
  static void
  report_error (char const *format, ...)
  {
    va_list args;
    va_start (args, format);
    fprintf (stderr, "test-regex: ");
    vfprintf (stderr, format, args);
    fprintf (stderr, "\n");
    va_end (args);
    exit_status = 1;
  }
  
  /* Check whether it's really a UTF-8 locale.
     On mingw, setlocale (LC_ALL, "en_US.UTF-8") succeeds but returns
     "English_United States.1252", with locale_charset () returning "CP1252".  */
  static int
  really_utf8 (void)
  {
    return strcmp (locale_charset (), "UTF-8") == 0;
  }
  
  /* Tests supposed to match; copied from glibc posix/bug-regex11.c.  */
  static struct
  {
    const char *pattern;
    const char *string;
    int flags, nmatch;
    regmatch_t rm[5];
  } const tests[] = {
    /* Test for newline handling in regex.  */
    { "[^~]*~", "\nx~y", 0, 2, { { 0, 3 }, { -1, -1 } } },
    /* Other tests.  */
    { "a(.*)b", "a b", REG_EXTENDED, 2, { { 0, 3 }, { 1, 2 } } },
    { ".*|\\([KIO]\\)\\([^|]*\\).*|?[KIO]", "10~.~|P|K0|I10|O16|?KSb", 0, 3,
      { { 0, 21 }, { 15, 16 }, { 16, 18 } } },
    { ".*|\\([KIO]\\)\\([^|]*\\).*|?\\1", "10~.~|P|K0|I10|O16|?KSb", 0, 3,
      { { 0, 21 }, { 8, 9 }, { 9, 10 } } },
    { "^\\(a*\\)\\1\\{9\\}\\(a\\{0,9\\}\\)\\([0-9]*;.*[^a]\\2\\([0-9]\\)\\)",
      "a1;;0a1aa2aaa3aaaa4aaaaa5aaaaaa6aaaaaaa7aaaaaaaa8aaaaaaaaa9aa2aa1a0", 0,
      5, { { 0, 67 }, { 0, 0 }, { 0, 1 }, { 1, 67 }, { 66, 67 } } },
    /* Test for BRE expression anchoring.  POSIX says just that this may match;
       in glibc regex it always matched, so avoid changing it.  */
    { "\\(^\\|foo\\)bar", "bar", 0, 2, { { 0, 3 }, { -1, -1 } } },
    { "\\(foo\\|^\\)bar", "bar", 0, 2, { { 0, 3 }, { -1, -1 } } },
    /* In ERE this must be treated as an anchor.  */
    { "(^|foo)bar", "bar", REG_EXTENDED, 2, { { 0, 3 }, { -1, -1 } } },
    { "(foo|^)bar", "bar", REG_EXTENDED, 2, { { 0, 3 }, { -1, -1 } } },
    /* Here ^ cannot be treated as an anchor according to POSIX.  */
    { "(^|foo)bar", "(^|foo)bar", 0, 2, { { 0, 10 }, { -1, -1 } } },
    { "(foo|^)bar", "(foo|^)bar", 0, 2, { { 0, 10 }, { -1, -1 } } },
    /* More tests on backreferences.  */
    { "()\\1", "x", REG_EXTENDED, 2, { { 0, 0 }, { 0, 0 } } },
    { "()x\\1", "x", REG_EXTENDED, 2, { { 0, 1 }, { 0, 0 } } },
    { "()\\1*\\1*", "", REG_EXTENDED, 2, { { 0, 0 }, { 0, 0 } } },
    { "([0-9]).*\\1(a*)", "7;7a6", REG_EXTENDED, 3, { { 0, 4 }, { 0, 1 }, { 3, 4 } } },
    { "([0-9]).*\\1(a*)", "7;7a", REG_EXTENDED, 3, { { 0, 4 }, { 0, 1 }, { 3, 4 } } },
    { "(b)()c\\1", "bcb", REG_EXTENDED, 3, { { 0, 3 }, { 0, 1 }, { 1, 1 } } },
    { "()(b)c\\2", "bcb", REG_EXTENDED, 3, { { 0, 3 }, { 0, 0 }, { 0, 1 } } },
    { "a(b)()c\\1", "abcb", REG_EXTENDED, 3, { { 0, 4 }, { 1, 2 }, { 2, 2 } } },
    { "a()(b)c\\2", "abcb", REG_EXTENDED, 3, { { 0, 4 }, { 1, 1 }, { 1, 2 } } },
    { "()(b)\\1c\\2", "bcb", REG_EXTENDED, 3, { { 0, 3 }, { 0, 0 }, { 0, 1 } } },
    { "(b())\\2\\1", "bbbb", REG_EXTENDED, 3, { { 0, 2 }, { 0, 1 }, { 1, 1 } } },
    { "a()(b)\\1c\\2", "abcb", REG_EXTENDED, 3, { { 0, 4 }, { 1, 1 }, { 1, 2 } } },
    { "a()d(b)\\1c\\2", "adbcb", REG_EXTENDED, 3, { { 0, 5 }, { 1, 1 }, { 2, 3 } } },
    { "a(b())\\2\\1", "abbbb", REG_EXTENDED, 3, { { 0, 3 }, { 1, 2 }, { 2, 2 } } },
    { "(bb())\\2\\1", "bbbb", REG_EXTENDED, 3, { { 0, 4 }, { 0, 2 }, { 2, 2 } } },
    { "^([^,]*),\\1,\\1$", "a,a,a", REG_EXTENDED, 2, { { 0, 5 }, { 0, 1 } } },
    { "^([^,]*),\\1,\\1$", "ab,ab,ab", REG_EXTENDED, 2, { { 0, 8 }, { 0, 2 } } },
    { "^([^,]*),\\1,\\1,\\1$", "abc,abc,abc,abc", REG_EXTENDED, 2,
      { { 0, 15 }, { 0, 3 } } },
    { "^(.?)(.?)(.?)(.?)(.?).?\\5\\4\\3\\2\\1$",
      "level", REG_NOSUB | REG_EXTENDED, 0, { { -1, -1 } } },
    { "^(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.).?\\9\\8\\7\\6\\5\\4\\3\\2\\1$|^.?$",
      "level", REG_NOSUB | REG_EXTENDED, 0, { { -1, -1 } } },
    { "^(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.).?\\9\\8\\7\\6\\5\\4\\3\\2\\1$|^.?$",
      "abcdedcba", REG_EXTENDED, 1, { { 0, 9 } } },
    { "^(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.).?\\9\\8\\7\\6\\5\\4\\3\\2\\1$|^.?$",
      "ababababa", REG_EXTENDED, 1, { { 0, 9 } } },
    { "^(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?).?\\9\\8\\7\\6\\5\\4\\3\\2\\1$",
      "level", REG_NOSUB | REG_EXTENDED, 0, { { -1, -1 } } },
    { "^(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?).?\\9\\8\\7\\6\\5\\4\\3\\2\\1$",
      "ababababa", REG_EXTENDED, 1, { { 0, 9 } } },
    /* Test for *+ match.  */
    { "^a*+(.)", "ab", REG_EXTENDED, 2, { { 0, 2 }, { 1, 2 } } },
    /* Test for ** match.  */
    { "^(a*)*(.)", "ab", REG_EXTENDED, 3, { { 0, 2 }, { 0, 1 }, { 1, 2 } } },
  };
  
  static void
  bug_regex11 (void)
  {
    regex_t re;
    regmatch_t rm[5];
    size_t i;
    int n;
  
    for (i = 0; i < sizeof (tests) / sizeof (tests[0]); ++i)
      {
        n = regcomp (&re, tests[i].pattern, tests[i].flags);
        if (n != 0)
          {
            char buf[500];
            regerror (n, &re, buf, sizeof (buf));
            report_error ("%s: regcomp %zd failed: %s", tests[i].pattern, i, buf);
            continue;
          }
  
        if (regexec (&re, tests[i].string, tests[i].nmatch, rm, 0))
          {
            report_error ("%s: regexec %zd failed", tests[i].pattern, i);
            regfree (&re);
            continue;
          }
  
        for (n = 0; n < tests[i].nmatch; ++n)
          if (rm[n].rm_so != tests[i].rm[n].rm_so
                || rm[n].rm_eo != tests[i].rm[n].rm_eo)
            {
              if (tests[i].rm[n].rm_so == -1 && tests[i].rm[n].rm_eo == -1)
                break;
              report_error ("%s: regexec %zd match failure rm[%d] %d..%d",
                            tests[i].pattern, i, n,
                            (int) rm[n].rm_so, (int) rm[n].rm_eo);
              break;
            }
  
        regfree (&re);
      }
  }
  
  int
  main (void)
  {
    static struct re_pattern_buffer regex;
    unsigned char folded_chars[UCHAR_MAX + 1];
    int i;
    const char *s;
    struct re_registers regs;
  
  #if HAVE_DECL_ALARM
    /* In case a bug causes glibc to go into an infinite loop.
       The tests should take less than 10 s on a reasonably modern CPU.  */
    int alarm_value = 1000;
    signal (SIGALRM, SIG_DFL);
    alarm (alarm_value);
  #endif
  
    bug_regex11 ();
  
    if (setlocale (LC_ALL, "en_US.UTF-8"))
      {
        {
          /* https://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.  */
          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)
            report_error ("%s: %s", pat, s);
          else
            {
              memset (&regs, 0, sizeof regs);
              i = re_search (&regex, data, sizeof data - 1,
                             0, sizeof data - 1, &regs);
              if (i != -1)
                report_error ("re_search '%s' on '%s' returned %d",
                              pat, data, i);
              regfree (&regex);
              free (regs.start);
              free (regs.end);
            }
        }
  
        if (really_utf8 ())
          {
            /* This test is from glibc bug 15078.
               The test case is from Andreas Schwab in
               <https://sourceware.org/ml/libc-alpha/2013-01/msg00967.html>.
            */
            static char const pat[] = "[^x]x";
            static char const data[] =
              /* <U1000><U103B><U103D><U1014><U103A><U102F><U1015><U103A> */
              "\xe1\x80\x80"
              "\xe1\x80\xbb"
              "\xe1\x80\xbd"
              "\xe1\x80\x94"
              "\xe1\x80\xba"
              "\xe1\x80\xaf"
              "\xe1\x80\x95"
              "\xe1\x80\xba"
              "x";
            re_set_syntax (0);
            memset (&regex, 0, sizeof regex);
            s = re_compile_pattern (pat, sizeof pat - 1, &regex);
            if (s)
              report_error ("%s: %s", pat, s);
            else
              {
                memset (&regs, 0, sizeof regs);
                i = re_search (&regex, data, sizeof data - 1,
                               0, sizeof data - 1, NULL);
                if (i != 0 && i != 21)
                  report_error ("re_search '%s' on '%s' returned %d",
                                pat, data, i);
                regfree (&regex);
                free (regs.start);
                free (regs.end);
              }
          }
  
        if (! setlocale (LC_ALL, "C"))
          {
            report_error ("setlocale \"C\" failed");
            return exit_status;
          }
      }
  
    if (setlocale (LC_ALL, "tr_TR.UTF-8"))
      {
        if (really_utf8 () && towupper (L'i') == 0x0130 /* U+0130; see below.  */)
          {
            re_set_syntax (RE_SYNTAX_GREP | RE_ICASE);
            memset (&regex, 0, sizeof regex);
            static char const pat[] = "i";
            s = re_compile_pattern (pat, sizeof pat - 1, &regex);
            if (s)
              report_error ("%s: %s", pat, s);
            else
              {
                /* UTF-8 encoding of U+0130 LATIN CAPITAL LETTER I WITH DOT ABOVE.
                   In Turkish, this is the upper-case equivalent of ASCII "i".
                   Older versions of Gnulib failed to match "i" to U+0130 when
                   ignoring case in Turkish <https://bugs.gnu.org/43577>.  */
                static char const data[] = "\xc4\xb0";
  
                memset (&regs, 0, sizeof regs);
                i = re_search (&regex, data, sizeof data - 1, 0, sizeof data - 1,
                               &regs);
                if (i != 0)
                  report_error ("re_search '%s' on '%s' returned %d",
                                pat, data, i);
                regfree (&regex);
                free (regs.start);
                free (regs.end);
              }
          }
  
        if (! setlocale (LC_ALL, "C"))
          {
            report_error ("setlocale \"C\" failed");
            return exit_status;
          }
      }
  
    /* This test is from glibc bug 3957, reported by Andrew Mackey.  */
    re_set_syntax (RE_SYNTAX_EGREP | RE_HAT_LISTS_NOT_NEWLINE);
    memset (&regex, 0, sizeof regex);
    static char const pat_3957[] = "a[^x]b";
    s = re_compile_pattern (pat_3957, sizeof pat_3957 - 1, &regex);
    if (s)
      report_error ("%s: %s", pat_3957, s);
    else
      {
        /* This should fail, but succeeds for glibc-2.5.  */
        memset (&regs, 0, sizeof regs);
        static char const data[] = "a\nb";
        i = re_search (&regex, data, sizeof data - 1, 0, sizeof data - 1, &regs);
        if (i != -1)
          report_error ("re_search '%s' on '%s' returned %d",
                        pat_3957, data, i);
        regfree (&regex);
        free (regs.start);
        free (regs.end);
      }
  
    /* This regular expression is from Spencer ere test number 75
       in grep-2.3.  */
    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;
    static char const pat75[] = "a[[:@:>@:]]b\n";
    s = re_compile_pattern (pat75, sizeof pat75 - 1, &regex);
    /* This should fail with _Invalid character class name_ error.  */
    if (!s)
      {
        report_error ("re_compile_pattern: failed to reject '%s'", pat75);
        regfree (&regex);
      }
  
    /* Ensure that [b-a] is diagnosed as invalid, when
       using RE_NO_EMPTY_RANGES. */
    re_set_syntax (RE_SYNTAX_POSIX_EGREP | RE_NO_EMPTY_RANGES);
    memset (&regex, 0, sizeof regex);
    static char const pat_b_a[] = "a[b-a]";
    s = re_compile_pattern (pat_b_a, sizeof pat_b_a - 1, &regex);
    if (s == NULL)
      {
        report_error ("re_compile_pattern: failed to reject '%s'", pat_b_a);
        regfree (&regex);
      }
  
    /* This should succeed, but does not for glibc-2.1.3.  */
    memset (&regex, 0, sizeof regex);
    static char const pat_213[] = "{1";
    s = re_compile_pattern (pat_213, sizeof pat_213 - 1, &regex);
    if (s)
      report_error ("%s: %s", pat_213, s);
    else
      regfree (&regex);
  
    /* The following example is derived from a problem report
       against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>.  */
    memset (&regex, 0, sizeof regex);
    static char const pat_stolfi[] = "[an\371]*n";
    s = re_compile_pattern (pat_stolfi, sizeof pat_stolfi - 1, &regex);
    if (s)
      report_error ("%s: %s", pat_stolfi, s);
    /* This should match, but does not for glibc-2.2.1.  */
    else
      {
        memset (&regs, 0, sizeof regs);
        static char const data[] = "an";
        i = re_match (&regex, data, sizeof data - 1, 0, &regs);
        if (i != 2)
          report_error ("re_match '%s' on '%s' at 2 returned %d",
                        pat_stolfi, data, i);
        regfree (&regex);
        free (regs.start);
        free (regs.end);
      }
  
    memset (&regex, 0, sizeof regex);
    static char const pat_x[] = "x";
    s = re_compile_pattern (pat_x, sizeof pat_x - 1, &regex);
    if (s)
      report_error ("%s: %s", pat_x, s);
    /* glibc-2.2.93 does not work with a negative RANGE argument.  */
    else
      {
        memset (&regs, 0, sizeof regs);
        static char const data[] = "wxy";
        i = re_search (&regex, data, sizeof data - 1, 2, -2, &regs);
        if (i != 1)
          report_error ("re_search '%s' on '%s' returned %d", pat_x, data, i);
        regfree (&regex);
        free (regs.start);
        free (regs.end);
      }
  
    /* The version of regex.c in older versions of gnulib
       ignored RE_ICASE.  Detect that problem too.  */
    re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
    memset (&regex, 0, sizeof regex);
    s = re_compile_pattern (pat_x, 1, &regex);
    if (s)
      report_error ("%s: %s", pat_x, s);
    else
      {
        memset (&regs, 0, sizeof regs);
        static char const data[] = "WXY";
        i = re_search (&regex, data, sizeof data - 1, 0, 3, &regs);
        if (i < 0)
          report_error ("re_search '%s' on '%s' returned %d", pat_x, data, i);
        regfree (&regex);
        free (regs.start);
        free (regs.end);
      }
  
    /* glibc bug 11053.  */
    re_set_syntax (RE_SYNTAX_POSIX_BASIC);
    memset (&regex, 0, sizeof regex);
    static char const pat_sub2[] = "\\(a*\\)*a*\\1";
    s = re_compile_pattern (pat_sub2, sizeof pat_sub2 - 1, &regex);
    if (s)
      report_error ("%s: %s", pat_sub2, s);
    else
      {
        memset (&regs, 0, sizeof regs);
        static char const data[] = "a";
        int datalen = sizeof data - 1;
        i = re_search (&regex, data, datalen, 0, datalen, &regs);
        if (i != 0)
          report_error ("re_search '%s' on '%s' returned %d", pat_sub2, data, i);
        else if (regs.num_regs < 2)
          report_error ("re_search '%s' on '%s' returned only %d registers",
                        pat_sub2, data, (int) regs.num_regs);
        else if (! (regs.start[0] == 0 && regs.end[0] == 1))
          report_error ("re_search '%s' on '%s' returned wrong match [%d,%d)",
                        pat_sub2, data, (int) regs.start[0], (int) regs.end[0]);
        else if (! (regs.start[1] == 0 && regs.end[1] == 0))
          report_error ("re_search '%s' on '%s' returned wrong submatch [%d,%d)",
                        pat_sub2, data, (int) regs.start[1], (int) regs.end[1]);
        regfree (&regex);
        free (regs.start);
        free (regs.end);
      }
  
    /* Catch a bug reported by Vin Shelton in
       https://lists.gnu.org/r/bug-coreutils/2007-06/msg00089.html
       */
    re_set_syntax (RE_SYNTAX_POSIX_BASIC
                   & ~RE_CONTEXT_INVALID_DUP
                   & ~RE_NO_EMPTY_RANGES);
    static char const pat_shelton[] = "[[:alnum:]_-]\\\\+$";
    s = re_compile_pattern (pat_shelton, sizeof pat_shelton - 1, &regex);
    if (s)
      report_error ("%s: %s", pat_shelton, s);
    else
      regfree (&regex);
  
    /* REG_STARTEND was added to glibc on 2004-01-15.
       Reject older versions.  */
    if (REG_STARTEND == 0)
      report_error ("REG_STARTEND is zero");
  
    /* Matching with the compiled form of this regexp would provoke
       an assertion failure prior to glibc-2.28:
         regexec.c:1375: pop_fail_stack: Assertion 'num >= 0' failed
       With glibc-2.28, compilation fails and reports the invalid
       back reference.  */
    re_set_syntax (RE_SYNTAX_POSIX_EGREP);
    memset (&regex, 0, sizeof regex);
    static char const pat_badback[] = "0|()0|\\1|0";
    s = re_compile_pattern (pat_badback, sizeof pat_badback, &regex);
    if (!s && re_search (&regex, "x", 1, 0, 1, &regs) != -1)
      s = "mishandled invalid back reference";
    if (s && strcmp (s, "Invalid back reference") != 0)
      report_error ("%s: %s", pat_badback, s);
  
  #if 0
    /* It would be nice to reject hosts whose regoff_t values are too
       narrow (including glibc on hosts with 64-bit ptrdiff_t and
       32-bit int), but we should wait until glibc implements this
       feature.  Otherwise, support for equivalence classes and
       multibyte collation symbols would always be broken except
       when compiling --without-included-regex.   */
    if (sizeof (regoff_t) < sizeof (ptrdiff_t)
        || sizeof (regoff_t) < sizeof (ssize_t))
      report_error ("regoff_t values are too narrow");
  #endif
  
    return exit_status;
  }
  

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