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Wildcard string compare (globbing)

, 15 Feb 2005
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Matches a string against a wildcard string such as "*.*" or "bl?h.*" etc. This is good for file globbing or to match hostmasks.

Usage:

This is a fast, lightweight, and simple pattern matching function.

if (wildcmp("bl?h.*", "blah.jpg")) {
  //we have a match!
} else {
  //no match =(
}

Function:

int wildcmp(const char *wild, const char *string) {
  // Written by Jack Handy - <A href="mailto:jakkhandy@hotmail.com">jakkhandy@hotmail.com</A>
  const char *cp = NULL, *mp = NULL;

  while ((*string) && (*wild != '*')) {
    if ((*wild != *string) && (*wild != '?')) {
      return 0;
    }
    wild++;
    string++;
  }

  while (*string) {
    if (*wild == '*') {
      if (!*++wild) {
        return 1;
      }
      mp = wild;
      cp = string+1;
    } else if ((*wild == *string) || (*wild == '?')) {
      wild++;
      string++;
    } else {
      wild = mp;
      string = cp++;
    }
  }

  while (*wild == '*') {
    wild++;
  }
  return !*wild;
}

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Jack Handy
Web Developer
United States United States
No Biography provided

Comments and Discussions

 
GeneralRe: great code, but ... PinmemberJack Handy18-Mar-03 14:25 
GeneralRe: great code, but ... PinsussAnonymous20-Mar-03 0:13 
GeneralNice PinmemberChris Richardson16-Jan-03 11:58 
GeneralRe: Nice PinmemberJack Handy20-Jan-03 12:56 
GeneralCool Code PinsussAnonymous6-Dec-02 12:09 
GeneralRe: Cool Code Pinmemberhector santos1-Mar-03 2:53 
GeneralRe: Cool Code PinsussKent C. Dorner2-Mar-03 6:32 
GeneralRe: Cool Code Pinmembergebrudergrimm28-Dec-03 11:18 
GeneralRe: Cool Code PinmemberBrcKcc15-Jun-04 9:18 
GeneralYes man - you a really cool developer PinmemberStanislav Panasik23-Oct-02 20:06 
GeneralRe: Yes man - you a really cool developer PinsussAnonymous28-Mar-04 14:43 
GeneralPseudo Code... Pinmemberblahblah18-Apr-02 11:45 
GeneralRe: Pseudo Code... PinmemberTargys8-Jan-03 3:43 
Generaltoo complicated PinmemberThe C++ Guru21-Mar-02 22:31 
why use local variables and so many loops? it can be much easier to match two strings. i don't understand why so many people spend hours to search the web for wildcard matching when they can write it themselves in 5 minutes time??!
the code below could be shorter but it's easier to read like this.
i didn't debug it very much but it will work, though.
 
// -------------------------------------------------------------------
int wildcmp(const char* wild, const char* string)
// -------------------------------------------------------------------
{
   if(*wild == *string)
      return '\0' == *string || wildcmp(++wild, ++string);
 
   if('\0' == *string)
      return '*' == *wild && wildcmp(++wild, string);
 
   switch(*wild)
   {
   case '?':
      return wildcmp(++wild, ++string);
 
   case '*':
      wild++;
 
      if('\0' == *wild)
         return 1;
     
      while(*string != '\0')
         if(wildcmp(wild, string++))
            return 1;
     
   default:
      return 0;
   }
}
 
yours,
the c++ guru himself.
GeneralRe: too complicated PinmemberBig Spender22-Mar-02 1:23 
GeneralRe: too complicated PinmemberThe C++ Guru22-Mar-02 1:34 
GeneralRe: too complicated PinmemberJack Handy22-Mar-02 16:23 
GeneralRe: too complicated PinmemberThe C++ Guru22-Mar-02 22:40 
GeneralRe: too complicated PinmemberJack Handy22-Mar-02 23:26 
GeneralRe: too complicated PinmemberHockey19-Apr-03 10:25 
GeneralRe: too complicated Pinmemberdouglashogan25-Jan-04 13:34 
GeneralRe: too complicated PinmemberJack Handy25-Jan-04 13:40 
GeneralRe: too complicated Pinmemberdouglashogan25-Jan-04 13:50 
GeneralRe: too complicated PinmemberJim Bob22-Mar-02 16:29 
GeneralRe: too complicated PinmemberSimon Capewell22-May-02 3:48 
GeneralRe: too complicated PinmemberTargys8-Jan-03 2:57 
GeneralRe: too complicated PinsussThe C++ Guru24-Feb-03 11:43 
GeneralRe: too complicated PinmemberJack Handy24-Feb-03 17:52 
GeneralRe: too complicated Pinmemberhector santos1-Mar-03 2:49 
GeneralRe: too complicated PinsussKent C. Dorner2-Mar-03 6:26 
GeneralRe: too complicated Pinmemberhector santos2-Mar-03 11:05 
GeneralRe: too complicated PinmemberJack Handy2-Jun-03 14:56 
GeneralRe: too complicated PinsussAnonymous2-Jun-03 15:48 
GeneralRe: too complicated PinsussAnonymous4-Dec-03 19:29 
GeneralRe: too complicated Pinmemberolegxxx4-Mar-05 20:24 
GeneralSweet! PinmemberEpicBoy1-Feb-02 17:08 
GeneralRe: Sweet! PinmemberMichael Dunn1-Feb-02 18:10 
GeneralRe: Sweet! PinmemberSteve Mallam13-May-02 1:29 
GeneralI found this very useful. PinmemberTodd Smith4-Jan-02 15:40 
GeneralTest Cases PinmemberPaul McGuire4-Dec-01 13:00 
GeneralRe: Test Cases PinmemberLee Elenbaas10-Sep-08 0:05 
GeneralSuper fast code - super, but... PinmemberRene Rassnitzer23-Aug-01 7:24 
GeneralGreat Code Pinmembermediamaster404-Jul-01 21:18 
GeneralRe: Great Code PinmemberAnonymous5-Jul-01 11:24 
GeneralRe: Great Code Pinmembersiukurnin4-Jul-02 3:15 
GeneralRe: Great Code PinsussThe C++ Guru8-Sep-02 8:22 
GeneralRe: Great Code PinsussAnonymous4-Dec-03 19:53 
Generalwildcmp("fold","??*"); PinmemberVadim Chavarha24-May-01 9:43 
GeneralRe: wildcmp( PinmemberJack Handy29-May-01 11:01 
GeneralNot DOS compatible PinmemberMiroslav Rajcic2-May-01 4:56 

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