c code for searching pascal-style strings

Posted on 1998-06-30
Last Modified: 2013-12-26
I have a dialog text-edit box that the user will type in what he wants to search for. Then I need to search through about 100 STR# for any matches. I can retrieve the text for the text-edit box, but then I don't really know where to go. All the c functions for handeling strings expect a c-style string, so it'd be a pain to covert everything. I heard something about a PStrCmp function, but I can't get it to work. Does anyone have some code or nifty functions that can help me? Thanks!
Question by:anthonyz
1 Comment

Accepted Solution

roov earned 50 total points
ID: 1291487
First, don't give so easily on conversion.
You might want to keep all your string resources in memory anyway, since loading them from the resource takes time, and if you keep them in memory, you might as well keep them as C strings, then get your user's string, convert it to C style, then use strstr or something similar.

Additionaly, the Mac Toolbox has EqualString, which compares two Pascal style strings.
The brute force of doing this search might look similar to this (without error checking/recovery):
short FindPattern(StringPtr inPattern, StringPtr inData)
      // return index of inPattern. ) if not found. Find last occurance...
      short location = 0;
      if (inData[0] < inPattern[0])
            return 0;
      if ((inData[0] == inPattern[0]) &&
            (EqualString(inData, inPattern, true, false))
            return 1;
      for (short ind = inData[0] - inPattern[0]; ind > inPattern[0]; ind--) {
            unsigned char storage = inData[ind];
            Boolean foundPattern = false;
            inData[ind] = inPattern[0];
            foundPattern = EqualString(&(inData[ind]), inPattern, true, false);
            inData[ind] = storage;
            if (foundPattern) {
                  location = ind;
      return location

Sorry if this has minor bugs...


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