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Annotation of 43BSDTahoe/usr.lib/lib2648/setmat.c, revision 1.1.1.1

1.1       root        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: }

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