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97e3edfb DF |
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) %G%"; | |
9 | #endif not lint | |
10 | ||
d755da8b RC |
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 | } |