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Wildcard string compare (globbing)

, 15 Feb 2005 805.7K 94
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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

 
GeneralMany thanks, with 1 small gripe .. Pin
David Patrick29-Sep-04 9:41
memberDavid Patrick29-Sep-04 9:41 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Jack Handy6-Oct-04 9:13
memberJack Handy6-Oct-04 9:13 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Vic Mackey16-Oct-04 20:33
memberVic Mackey16-Oct-04 20:33 
I disagree. The return value for strcmp() is more than simply a test for equality, it tells you which string is greater than the other. A zero return value for strcmp() makes sense, but not for wildcmp() since the return value is strictly boolean, match or no match. The current implementation is fine (although some people might be picky about the return type, int vs bool). Perhaps to avoid confusion with string comparison functions, the function should be renamed to wildmatch() or something similar.

GeneralRe: Many thanks, with 1 small gripe .. Pin
Voja Intermajstor25-Nov-04 0:26
memberVoja Intermajstor25-Nov-04 0:26 

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