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Comparing ray/src/util/rad.c (file contents):
Revision 2.26 by greg, Fri Sep 24 16:49:02 1993 UTC vs.
Revision 2.27 by greg, Sat Sep 25 13:21:35 1993 UTC

# Line 437 | Line 437 | int    pred;
437          register int    n;
438          int     suffix;
439  
440 <        suffix = n = strlen(orig);              /* find start of suffix */
441 <        if ((cp = rindex(orig, '.')) != NULL)
442 <                suffix = cp - orig;
440 >        n = 0; cp = orig; suffix = -1;          /* suffix position, length */
441 >        while (*cp) {
442 >                if (*cp == '.') suffix = n;
443 >                else if (ISDIRSEP(*cp)) suffix = -1;
444 >                cp++; n++;
445 >        }
446 >        if (suffix == -1) suffix = n;
447          if ((cp = bmalloc(n+2)) == NULL)
448                  syserr(progname);
449          strncpy(cp, orig, suffix);

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