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Posted 1 May 2001

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Wildcard string compare (globbing)

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4.88 (78 votes)
15 Feb 2005        
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.

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About the Author

Jack Handy
Web Developer
United States United States
No Biography provided

Comments and Discussions

 
GeneralRe: C# version Pin
williamhix17-Oct-08 22:28
memberwilliamhix17-Oct-08 22:28 
GeneralMany thanks, with 1 small gripe .. Pin
David Patrick29-Sep-04 8:41
memberDavid Patrick29-Sep-04 8:41 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Jack Handy6-Oct-04 8:13
memberJack Handy6-Oct-04 8:13 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Vic Mackey16-Oct-04 19:33
memberVic Mackey16-Oct-04 19:33 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Voja Intermajstor24-Nov-04 23:26
memberVoja Intermajstor24-Nov-04 23:26 
GeneralNice code... Pin
Voja Intermajstor25-Aug-04 2:30
memberVoja Intermajstor25-Aug-04 2:30 
GeneralSlight efficiency improvement Pin
GKarRacer9-Jul-04 6:53
memberGKarRacer9-Jul-04 6:53 
GeneralRe: Slight efficiency improvement Pin
GKarRacer9-Jul-04 7:19
memberGKarRacer9-Jul-04 7:19 
Maybe I posted too soon. I didn't think there was a way for cp to not equal string+1. But, after thinking about it some more I found a pattern type that would:

*???c*

It's interesting how the loop keeps shifting back and forth with this type of pattern.

However, using a test string of "testing" with the above pattern the match still failed (correctly) using both algorithms. But, there easily may be a pattern and string combination that wouldn't work without cp.
QuestionPathMatchSpec (shlwapi.h)? Pin
peterchen28-Jun-04 6:56
memberpeterchen28-Jun-04 6:56 
AnswerRe: PathMatchSpec (shlwapi.h)? Pin
Jack Handy13-Feb-05 9:56
memberJack Handy13-Feb-05 9:56 
GeneralDoesnt seem to work well.. Pin
bikram singh13-May-04 1:56
memberbikram singh13-May-04 1:56 
GeneralRe: Doesnt seem to work well.. Pin
Jack Handy21-Jun-04 9:13
memberJack Handy21-Jun-04 9:13 
GeneralCase Insensitive wildcmp Pin
Member 95170316-Mar-04 9:36
memberMember 95170316-Mar-04 9:36 
GeneralRe: Case Insensitive wildcmp Pin
Neville Franks16-Mar-04 9:52
memberNeville Franks16-Mar-04 9:52 
GeneralRe: Case Insensitive wildcmp Pin
23-Mar-04 9:33
suss23-Mar-04 9:33 
GeneralRe: Case Insensitive wildcmp Pin
David Crow23-Feb-05 2:24
memberDavid Crow23-Feb-05 2:24 
GeneralRe: Case Insensitive wildcmp Pin
Vic Mackey23-Feb-05 8:00
memberVic Mackey23-Feb-05 8:00 
GeneralRe: Case Insensitive wildcmp Pin
David Crow23-Feb-05 8:22
memberDavid Crow23-Feb-05 8:22 
GeneralRe: Case Insensitive wildcmp Pin
f_randy12-Jun-06 18:13
memberf_randy12-Jun-06 18:13 
GeneralExcellent code! Pin
Hans Dietrich16-Jul-03 19:40
mentorHans Dietrich16-Jul-03 19:40 
Generalchecking for null Pin
Jack Handy13-Mar-03 20:38
memberJack Handy13-Mar-03 20:38 
GeneralRe: checking for null Pin
Anonymous15-Mar-03 20:10
memberAnonymous15-Mar-03 20:10 
GeneralRe: checking for null Pin
Jack Handy18-Mar-03 13:25
memberJack Handy18-Mar-03 13:25 
Generalgreat code, but ... Pin
Anonymous12-Mar-03 3:17
memberAnonymous12-Mar-03 3:17 
GeneralRe: great code, but ... Pin
Jack Handy13-Mar-03 20:34
memberJack Handy13-Mar-03 20:34 

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