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root/Development/ray/src/rt/rpict.c
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Comparing ray/src/rt/rpict.c (file contents):
Revision 1.22 by greg, Sat Oct 13 21:32:25 1990 UTC vs.
Revision 1.23 by greg, Thu Nov 1 12:06:01 1990 UTC

# Line 141 | Line 141 | char  *zfile, *oldfile;
141          fputresolu(YMAJOR|YDECR, hresolu, vresolu, stdout);
142                                          /* recover file and compute first */
143          i = salvage(oldfile);
144 <        if (zfd != -1 && lseek(zfd, (long)i*hresolu*sizeof(float), 0) == -1)
144 >        if (zfd != -1 && i > 0 &&
145 >                        lseek(zfd, (long)i*hresolu*sizeof(float), 0) == -1)
146                  error(SYSTEM, "z file seek error in render");
147          ypos = vresolu-1 - i;
148          fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample);

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