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
|
#define _XOPEN_SOURCE 700
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include "more.h"
static FILE *resetty = NULL;
static struct termios resettings = { 0 };
static void resetterm(void)
{
tcsetattr(fileno(resetty), TCSANOW, &resettings);
}
static int query_term(const char *cap, const char *variable, int def)
{
int n = 0;
char cmd[64];
snprintf(cmd, sizeof(cmd), "tput %s", cap);
FILE *f = popen(cmd, "r");
if (f) {
if (fscanf(f, "%d", &n) != 1) {
n = 0;
}
pclose(f);
if (n != 0) {
return n;
}
}
char *value = getenv(variable);
if (value) {
n = atoi(value);
}
return n ? n : def;
}
struct more_tty more_open_tty(int lines)
{
struct more_tty mt = {
.tty = stderr,
.lines = query_term("lines", "LINES", 24),
.columns = query_term("cols", "COLUMNS", 80),
};
if (lines > 0) {
mt.lines = lines;
}
/* leave room for prompts */
lines--;
/* FIXME: only open /dev/tty if stderr is not readable */
// if (!(fcntl(fileno(mt.tty), F_GETFL) & (O_WRONLY | O_RDWR))) {
mt.tty = fopen("/dev/tty", "rb+");
// }
if (mt.tty == NULL) {
perror("Couldn't open tty for reading");
exit(1);
}
setbuf(mt.tty, NULL);
tcgetattr(fileno(mt.tty), &resettings);
struct termios term = resettings;
term.c_lflag &= ~(ECHO | ICANON);
term.c_cc[VMIN] = 1;
term.c_cc[VTIME] = 0;
tcsetattr(fileno(mt.tty), TCSANOW, &term);
resetty = mt.tty;
atexit(resetterm);
return mt;
}
|
