4.3BSD - /usr/src/usr.lib/lib2648/setmat.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: static char sccsid[] = "@(#)setmat.c	5.1 (Berkeley) 4/26/85";
   9: #endif not lint
  10: 
  11: /*
  12:  * setmat: set the value in m[r, c] to nval.
  13:  */
  14: 
  15: #include "bit.h"
  16: 
  17: setmat(m, rows, cols, r, c, nval)
  18: bitmat m;
  19: int rows, cols, r, c, nval;
  20: {
  21:     register int offset, thisbit;
  22: 
  23:     if (r<0 || c<0 || r>=rows || c>=cols) {
  24: #ifdef TRACE
  25:         if (trace)
  26:             fprintf(trace, "setmat range error: (%d, %d) <- %d in a (%d, %d) matrix %x\n", r, c, nval, rows, cols, m);
  27: #endif
  28: 
  29:         return;
  30:     }
  31:     offset = r*((cols+7)>>3) + (c>>3);
  32:     thisbit = 0x80 >> (c&7);
  33:     if (nval)
  34:         m[offset] |= thisbit;
  35:     else
  36:         m[offset] &= ~thisbit;
  37: }

Defined functions

Defined variables