1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
#include "segment.h"
#define NCOLS 100
#define NROWS 100
#define SROWS 8
#define SCOLS 8
#define LEN 2
#define NSEGS 4
int main(int argc, char **argv)
{
SEGMENT seg;
char data[NROWS*NCOLS*LEN];
int row, col;
int i;
int fd;
char junk[3];
fprintf (stdout,"creating seg.file\n");
fd = creat ("seg.file", 0666);
if (fd < 0)
{
perror ("seg.file");
exit(1);
}
segment_format (fd, NROWS,NCOLS,SROWS,SCOLS,LEN);
close (fd);
fprintf (stdout,"opening seg.file\n");
fd = open ("seg.file", 2);
if (fd < 0)
{
perror ("seg.file");
exit(1);
}
segment_init (&seg, fd, NSEGS);
fprintf (stdout,"rows %d, cols %d (len %d)\n", seg.nrows, seg.ncols, seg.len);
if (seg.nrows != NROWS || seg.ncols != NCOLS || seg.len != LEN)
{
fprintf (stdout,"OOPS - wrong segment file\n");
exit(1);
}
fprintf (stdout,"writing seg.file\n");
for (row = 0 ; row < NROWS; row++)
{
for (col = 0; col < NCOLS; col++)
{
data[col*2] = row;
data[col*2 + 1] = col;
}
segment_put_row (&seg, data, row);
}
while(1)
{
for (i = 0; i < seg.nseg; i++)
if (seg.scb[i].n >= 0)
{
fprintf (stdout,"segment %d age %d",
seg.scb[i].n, seg.scb[i].age);
if (i == seg.cur)
fprintf (stdout," current");
fprintf (stdout,"\n");
}
fprintf (stdout,"\nenter row col: ");
if (!fgets(data,20,stdin)) break;
if (sscanf (data, "%1s", junk) != 1) continue;
if (sscanf (data, "%d%d", &row, &col) != 2)
fprintf (stdout,"??\n");
else if(row < 0 || row >= NROWS || col < 0 || col >= NCOLS)
fprintf (stdout,"bad row/col value(s)\n");
else
{
segment_get (&seg, data, row, col);
fprintf (stdout,"data = %d %d\n", data[0], data[1]);
}
}
segment_release (&seg) ;
close (fd);
}
|
