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
81
82
83
84
85
86
87
88
89
90
|
/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com>
*/
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <sys/ioctl.h>
#define REQ_PRINT_USAGE /* Require print_usage() from common.h */
#define REQ_ERRPRINT /* Require errprint() from common.h */
#define DESCRIPTION "Display files in a page-by-page basis."
#define OPERANDS "file ..."
#include "common.h"
#ifdef FASESBOX
int more_main(int argc, char *argv[]) {
#else
int main(int argc, char *argv[]) {
#endif
int i = 0, argument, success = 0, read_file = 1;
long int /* columns, */ lines;
char buffer[4096], cmd, *argv0 = strdup(argv[0]);
struct winsize w;
FILE *file;
struct termios oldattr, newattr;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
if (getenv("LINES")) lines = strtol(getenv("LINES"), NULL, 10) - 1;
else lines = w.ws_row - 1;
//if (getenv("COLUMNS")) columns = strtol(getenv("COLUMNS"), NULL, 10);
//else columns = w.ws_col - 1;
while ((argument = getopt(argc, argv, "")) != -1) {
if (argument == '?') {
print_usage(argv[0], DESCRIPTION, OPERANDS, VERSION);
return 1;
}
} argc -= optind; argv += optind;
if (argc != 1) {
print_usage(argv0, DESCRIPTION, OPERANDS, VERSION); return 1;
}
file = fopen(argv[0], "r");
if (errno) return errprint(argv0, argv[0], errno);
while (!success) {
if (!read_file) read_file = 1; /* 1 => read on a page-by-page basis
* 0 => don't read at all
* 2 => read on a line-by-line basis
*/
for (i = 0; i < lines && read_file != 0; i++) {
if (fgets(buffer, 4096, file) != NULL) {
printf("%s", buffer);
}
else if (errno) return errprint(argv0, "fgets()", errno);
else
putchar((int)'\n');
if (read_file == 2) {
break;
}
}
read_file = 0;
/* Get a character */
tcgetattr(0, &oldattr); /* Get previous terminal parameters */
newattr = oldattr;
newattr.c_lflag &= ~( ICANON | ECHO ); /* Disable ECHO and ICANON */
tcsetattr(0, TCSANOW, &newattr); /* Set net parameters */
cmd = getchar();
tcsetattr(0, TCSANOW, &oldattr); /* Restore old parameters */
if (errno) return errprint(argv0, NULL, errno);
switch (cmd) {
case 'q':
return 0;
case 'h':
print_usage(argv0, DESCRIPTION, OPERANDS, VERSION);
read_file = 0;
break;
case ' ':
read_file = 1; /* page-by-page */
break;
default:
read_file = 2; /* line-by-line */
break;
}
}
return errprint(argv0, NULL, errno);
}
|
