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