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Wildcard string compare (globbing)

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4.90 (79 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.

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: too complicated Pin
Anonymous2-Jun-03 14:48
memberAnonymous2-Jun-03 14:48 
GeneralRe: too complicated Pin
Anonymous4-Dec-03 18:29
memberAnonymous4-Dec-03 18:29 
GeneralRe: too complicated Pin
olegxxx4-Mar-05 19:24
memberolegxxx4-Mar-05 19:24 
GeneralSweet! Pin
EpicBoy1-Feb-02 16:08
memberEpicBoy1-Feb-02 16:08 
GeneralRe: Sweet! Pin
Michael Dunn1-Feb-02 17:10
sitebuilderMichael Dunn1-Feb-02 17:10 
GeneralRe: Sweet! Pin
13-May-02 0:29
suss13-May-02 0:29 
GeneralI found this very useful. Pin
Todd Smith4-Jan-02 14:40
memberTodd Smith4-Jan-02 14:40 
GeneralTest Cases Pin
Paul McGuire4-Dec-01 12:00
memberPaul McGuire4-Dec-01 12:00 
I ran the following test cases through wildcmp, all successful. (The test() function compares the pattern to the input string, and compares against the expected result).

test( "", "", true );
test( "*", "", true );
test( "*", "A", true );
test( "", "A", false );
test( "A*", "", false );
test( "A*", "AAB", true );
test( "A*", "BAA", false );
test( "A*", "A", true );
test( "A*B", "", false );
test( "A*B", "AAB", true );
test( "A*B", "AB", true );
test( "A*B", "AABA", false );
test( "A*B", "ABAB", true );
test( "A*B", "ABBBB", true );
test( "A*B*C", "", false );
test( "A*B*C", "ABC", true );
test( "A*B*C", "ABCC", true );
test( "A*B*C", "ABBBC", true );
test( "A*B*C", "ABBBBCCCC", true );
test( "A*B*C", "ABCBBBCBCCCBCBCCCC", true );
test( "A*B*", "AB", true );
test( "A*B*", "AABA", true );
test( "A*B*", "ABAB", true );
test( "A*B*", "ABBBB", true );
test( "A*B*C*", "", false );
test( "A*B*C*", "ABC", true );
test( "A*B*C*", "ABCC", true );
test( "A*B*C*", "ABBBC", true );
test( "A*B*C*", "ABBBBCCCC", true );
test( "A*B*C*", "ABCBBBCBCCCBCBCCCC", true );
test( "A?", "AAB", false );
test( "A?B", "AAB", true );
test( "A?*", "A", false );
test( "A?*", "ABBCC", true );
test( "A?*", "BAA", false );



Paul McGuire
KLA-Tencor/Process Analysis & Control Division
Austin, TX
GeneralRe: Test Cases Pin
Lee Elenbaas9-Sep-08 23:05
memberLee Elenbaas9-Sep-08 23:05 
GeneralSuper fast code - super, but... Pin
23-Aug-01 6:24
suss23-Aug-01 6:24 
GeneralGreat Code Pin
4-Jul-01 20:18
suss4-Jul-01 20:18 
GeneralRe: Great Code Pin
5-Jul-01 10:24
suss5-Jul-01 10:24 
GeneralRe: Great Code Pin
4-Jul-02 2:15
suss4-Jul-02 2:15 
GeneralRe: Great Code Pin
The C++ Guru8-Sep-02 7:22
sussThe C++ Guru8-Sep-02 7:22 
GeneralRe: Great Code Pin
Anonymous4-Dec-03 18:53
memberAnonymous4-Dec-03 18:53 
Generalwildcmp("fold","??*"); Pin
24-May-01 8:43
suss24-May-01 8:43 
GeneralRe: wildcmp( Pin
Jack Handy29-May-01 10:01
memberJack Handy29-May-01 10:01 
GeneralNot DOS compatible Pin
Miroslav Rajcic2-May-01 3:56
memberMiroslav Rajcic2-May-01 3:56 
GeneralRe: Not DOS compatible Pin
Jack Handy2-May-01 12:03
memberJack Handy2-May-01 12:03 
GeneralRe: Not DOS compatible Pin
Miroslav Rajcic6-May-01 23:04
memberMiroslav Rajcic6-May-01 23:04 
GeneralDOS compatible workaround Pin
5-Jul-01 1:47
suss5-Jul-01 1:47 
GeneralRe: Not DOS compatible Pin
W2k27-Dec-02 13:26
memberW2k27-Dec-02 13:26 
QuestionWhy, oh why only? Pin
2-May-01 2:17
suss2-May-01 2:17 
AnswerRe: Why, oh why only? Pin
Simon Capewell2-May-01 2:39
memberSimon Capewell2-May-01 2:39 
GeneralRe: Why, oh why only? Pin
5-Jul-01 10:27
suss5-Jul-01 10:27 

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Article
Posted 1 May 2001

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