1  /* Compatibility symbols for the obsolete <regexp.h> interface.
       2     Copyright (C) 1996-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* regexp.h now contains only an #error directive, so it cannot be
      20     used in this file.
      21  
      22     The function that would produce an 'expbuf' to use as the second
      23     argument to 'step' and 'advance' was defined only in regexp.h,
      24     as its definition depended on macros defined by the user.  */
      25  
      26  #include <stdint.h>
      27  #include <regex.h>
      28  #include <shlib-compat.h>
      29  
      30  #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
      31  
      32  /* Define the variables used for the interface.  */
      33  char *loc1;
      34  char *loc2;
      35  compat_symbol (libc, loc1, loc1, GLIBC_2_0);
      36  compat_symbol (libc, loc2, loc2, GLIBC_2_0);
      37  
      38  /* Although we do not support the use we define this variable as well.  */
      39  char *locs;
      40  compat_symbol (libc, locs, locs, GLIBC_2_0);
      41  
      42  
      43  /* Find the next match in STRING.  The compiled regular expression is
      44     found in the buffer starting at EXPBUF.  `loc1' will return the
      45     first character matched and `loc2' points to the next unmatched
      46     character.  */
      47  int
      48  weak_function attribute_compat_text_section
      49  step (const char *string, const char *expbuf)
      50  {
      51    regmatch_t match;	/* We only need info about the full match.  */
      52  
      53    expbuf += __alignof (regex_t *);
      54    expbuf -= ((uintptr_t) expbuf) % __alignof__ (regex_t *);
      55  
      56    if (__regexec ((const regex_t *) expbuf, string, 1, &match, REG_NOTEOL)
      57        == REG_NOMATCH)
      58      return 0;
      59  
      60    loc1 = (char *) string + match.rm_so;
      61    loc2 = (char *) string + match.rm_eo;
      62    return 1;
      63  }
      64  compat_symbol (libc, step, step, GLIBC_2_0);
      65  
      66  
      67  /* Match the beginning of STRING with the compiled regular expression
      68     in EXPBUF.  If the match is successful `loc2' will contain the
      69     position of the first unmatched character.  */
      70  int
      71  weak_function attribute_compat_text_section
      72  advance (const char *string, const char *expbuf)
      73  {
      74    regmatch_t match;	/* We only need info about the full match.  */
      75  
      76    expbuf += __alignof__ (regex_t *);
      77    expbuf -= ((uintptr_t) expbuf) % __alignof__ (regex_t *);
      78  
      79    if (__regexec ((const regex_t *) expbuf, string, 1, &match, REG_NOTEOL)
      80        == REG_NOMATCH
      81        /* We have to check whether the check is at the beginning of the
      82  	 buffer.  */
      83        || match.rm_so != 0)
      84      return 0;
      85  
      86    loc2 = (char *) string + match.rm_eo;
      87    return 1;
      88  }
      89  compat_symbol (libc, advance, advance, GLIBC_2_0);
      90  
      91  
      92  #endif /* SHLIB_COMPAT (2.0, 2.23) */