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Annotation of 42BSD/usr.lib/lib2648/setmat.c, revision 1.1.1.1

1.1       root        1: /*     setmat.c        4.1     83/03/09        */
                      2: /*
                      3:  * setmat: set the value in m[r, c] to nval.
                      4:  */
                      5: 
                      6: #include "bit.h"
                      7: 
                      8: setmat(m, rows, cols, r, c, nval)
                      9: bitmat m;
                     10: int rows, cols, r, c, nval;
                     11: {
                     12:        register int offset, thisbit;
                     13: 
                     14:        if (r<0 || c<0 || r>=rows || c>=cols) {
                     15: #ifdef TRACE
                     16:                if (trace)
                     17:                        fprintf(trace, "setmat range error: (%d, %d) <- %d in a (%d, %d) matrix %x\n", r, c, nval, rows, cols, m);
                     18: #endif
                     19: 
                     20:                return;
                     21:        }
                     22:        offset = r*((cols+7)>>3) + (c>>3);
                     23:        thisbit = 0x80 >> (c&7);
                     24:        if (nval)
                     25:                m[offset] |= thisbit;
                     26:        else
                     27:                m[offset] &= ~thisbit;
                     28: }

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