src/wildcard.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include <string>
  20 #include "inspircd_config.h"
  21 #include "inspircd.h"
  22 #include "helperfuncs.h"
  23 #include "inspstring.h"
  24
  25 extern char lowermap[255];
  26
  27 // Wed 27 Apr 2005 - Brain
  28 // I've taken our our old wildcard routine -
  29 // although comprehensive, it was topheavy and very
  30 // slow, and ate masses of cpu when doing lots of
  31 // comparisons. This is the 'de-facto' routine used
  32 // by many, nobody really knows who wrote it first
  33 // or what license its under, i've seen examples of it
  34 // (unattributed to any author) all over the 'net.
  35 // For now, we'll just consider this public domain.
  36
  37 bool match(const char *str, const char *mask)
  38 {
  39         unsigned char *cp, *mp;
  40         unsigned char* string = (unsigned char*)str;
  41         unsigned char* wild = (unsigned char*)mask;
  42
  43         while ((*string) && (*wild != '*'))
  44         {
  45                 if ((lowermap[*wild] != lowermap[*string]) && (*wild != '?'))
  46                 {
  47                         return 0;
  48                 }
  49                 wild++;
  50                 string++;
  51         }
  52
  53         while (*string)
  54         {
  55                 if (*wild == '*')
  56                 {
  57                         if (!*++wild)
  58                         {
  59                                 return 1;
  60                         }
  61                         mp = wild;
  62                         cp = string+1;
  63                 }
  64                 else
  65                 if ((lowermap[*wild] == lowermap[*string]) || (*wild == '?'))
  66                 {
  67                         wild++;
  68                         string++;
  69                 }
  70                 else
  71                 {
  72                         wild = mp;
  73                         string = cp++;
  74                 }
  75
  76         }
  77
  78         while (*wild == '*')
  79         {
  80                 wild++;
  81         }
  82
  83         return !*wild;
  84 }
  85