sys/share/pmatchregex.c

   1 /* NetHack 3.6  posixregex.c    $NHDT-Date: 1434446946 2015/06/16 09:29:06 $  $NHDT-Branch: master $:$NHDT-Revision: 1.1 $ */
   2 /* Copyright (c) Sean Hunt  2015.                                 */
   3 /* NetHack may be freely redistributed.  See license for details. */
   4
   5 #include "hack.h"
   6
   7 /* Implementation of the regex engine using pmatch().
   8  * [Switched to pmatchi() so as to ignore case.]
   9  *
  10  * This is a fallback ONLY and should be avoided where possible, as it results
  11  * in regexes not behaving as POSIX extended regular expressions. As a result,
  12  * configuration files for NetHacks built with this engine will not be
  13  * portable to ones built with an alternate regex engine.
  14  */
  15
  16 const char regex_id[] = "pmatchregex";
  17
  18 struct nhregex {
  19     const char *pat;
  20 };
  21
  22 struct nhregex *
  23 regex_init()
  24 {
  25     struct nhregex *re;
  26
  27     re = (struct nhregex *) alloc(sizeof (struct nhregex));
  28     re->pat = (const char *) 0;
  29     return re;
  30 }
  31
  32 boolean
  33 regex_compile(s, re)
  34 const char *s;
  35 struct nhregex *re;
  36 {
  37     if (!re)
  38         return FALSE;
  39     if (re->pat)
  40         free((genericptr_t) re->pat);
  41
  42     re->pat = dupstr(s);
  43     return TRUE;
  44 }
  45
  46 const char *
  47 regex_error_desc(re)
  48 struct nhregex *re UNUSED;
  49 {
  50     return "pattern match compilation error";
  51 }
  52
  53 boolean
  54 regex_match(s, re)
  55 const char *s;
  56 struct nhregex *re;
  57 {
  58     if (!re || !re->pat || !s)
  59         return FALSE;
  60
  61     return pmatchi(re->pat, s);
  62 }
  63
  64 void
  65 regex_free(re)
  66 struct nhregex *re;
  67 {
  68     if (re) {
  69         if (re->pat)
  70             free((genericptr_t) re->pat);
  71         free((genericptr_t) re);
  72     }
  73 }