[Crossfire-wiki] [Crossfire DokuWiki] page changed: user:mhoram:code:bwp

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Date        : 2007/01/17 10:46
User        : mhoram
Edit Summary: thanks for the help!

@@ -6,11 +6,21 @@
  
  Also, if anyone knows of a good C primer/tutorial online, please let me know.
  
    * In the sortbyname, a and b will be const char* *, not char*, thus you need to dereference them => ''strcpy(aa,(*(const char* *)a));'' or something like that :)
+     * I've stared at this for a while, and found some examples that do it, and I think I'm starting to understand it.  I still don't quite see how the arguments can be char* *, when the function defines them as const void *, but I'll get there.
+       * I changed it to the example you gave, and now it segfaults on that strcpy. ;-)  I think I'm on the right track now, though.  It makes sense that the problem was in that comparison routine, since I checked the addresses of the variables within join_with_comma, and none of them were even close to the ones that were getting mangled.
+ 
    * Also, to compare, try ''strcasecmp'' which does case-insensitive comparison.
+     * That would be much easier, wouldn't it? :-)
+ 
    * ''append_with_comma'' (not used, but just in case) has a side effect: old will be destroyed if not NULL - the ''realloc'' can make the original pointer (which still exists probably) point to a freed memory.
+     * That function got replaced by join_with_comma and will be deleted anyway, but I should understand this.  Isn't the whole point of realloc that it leaves the data pointed to unchanged?
+ 
    * and some day don't forget to ''free()'' allocated memory (for the char* and such) ^_-
+     * Yes, I figured I'd need to do that, but I'm still learning just what I have to free.  Anything I allocated manually, I assume, but I get a little hazy on it when something was allocated in a subroutine.
+ 
+ Thanks for all your help!
  
  ===== Notes & Comments =====
  
  


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Old Revision: http://wiki.metalforge.net/doku.php/user:mhoram:code:bwp?rev=1169040243
New Revision: http://wiki.metalforge.net/doku.php/user:mhoram:code:bwp

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