common/OpenClass.c

   1 struct ClassLibrary *OpenClass(CONST_STRPTR name, CONST_STRPTR prefix, ULONG version)
   2
   3 /* Open named class. Look both in current and images/ directory
   4  */
   5 {
   6         static struct EasyStruct OpenClassES =
   7         {
   8                 sizeof(struct EasyStruct),
   9                 0,
  10                 versiontag + 6,
  11                 "Couldn't open %s version %ld or greater",
  12                 "Ok"
  13         };
  14
  15         struct ClassLibrary *classbase;
  16         char buf[256];
  17         int i;
  18
  19
  20         if (!(classbase = (struct ClassLibrary *)OpenLibrary(name, version)))
  21         {
  22                 /* We can't use AddPart() here because we didn't open dos.library */
  23
  24                 /* Copy the prefix in the buffer */
  25                 for (i = 0; buf[i] = prefix[i]; i++);
  26
  27                 /* Insert trailing character if missing */
  28                 if(buf[i] != '/')
  29                         buf[++i] = '/';
  30
  31                 /* Append the name */
  32                 while (buf[i++] = *name++);
  33
  34                 /* Try again */
  35                 classbase = (struct ClassLibrary *)OpenLibrary(buf, version);
  36
  37                 if (!classbase)
  38                 {
  39                         /* Report an error */
  40                         EasyRequest(NULL, &OpenClassES, NULL, buf, version);
  41                 }
  42         }
  43         return classbase;
  44 }