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HEAD
date and time created 83/08/05 13:34:37 by sam
[unix-history]
/
usr
/
src
/
old
/
lib2648
/
emptyrow.c
/* emptyrow.c 4.1 83/03/09 */
/*
* emptyrow: returns true if row r of m is all zeros.
*
* Note that we assume the garbage at the end of the
* row is all zeros.
*/
#include
"bit.h"
emptyrow
(
m
,
rows
,
cols
,
r
)
bitmat m
;
int
rows
,
cols
,
r
;
{
char
*
top
, *
bot
;
bot
= &
m
[
r
*((
cols
+
7
)>>
3
)];
top
=
bot
+ ((
cols
-
1
) >>
3
);
while
(
bot
<=
top
)
if
(*
bot
++)
return
(
0
);
return
(
1
);
}