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-rw-r--r--more.c217
1 files changed, 0 insertions, 217 deletions
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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini more implementation for busybox
4 *
5 *
6 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
7 *
8 * Latest version blended together by Erik Andersen <andersen@lineo.com>,
9 * based on the original more implementation by Bruce, and code from the
10 * Debian boot-floppies team.
11 *
12 * Termios corrects by Vladimir Oleynik <vodz@usa.net>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 *
28 */
29
30#include <stdio.h>
31#include <fcntl.h>
32#include <signal.h>
33#include <stdlib.h>
34#include <unistd.h>
35#include <sys/ioctl.h>
36#include "busybox.h"
37
38static FILE *cin;
39
40#ifdef BB_FEATURE_USE_TERMIOS
41#include <termios.h>
42#define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
43#define getTermSettings(fd,argp) tcgetattr(fd, argp);
44
45static struct termios initial_settings, new_settings;
46
47static void set_tty_to_initial_mode(void)
48{
49 setTermSettings(fileno(cin), &initial_settings);
50}
51
52static void gotsig(int sig)
53{
54 putchar('\n');
55 exit(EXIT_FAILURE);
56}
57#endif /* BB_FEATURE_USE_TERMIOS */
58
59
60static int terminal_width = 79; /* not 80 in case terminal has linefold bug */
61static int terminal_height = 24;
62
63
64extern int more_main(int argc, char **argv)
65{
66 int c, lines, input = 0;
67 int please_display_more_prompt = -1;
68 struct stat st;
69 FILE *file;
70 int len, page_height;
71
72#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
73 struct winsize win = { 0, 0, 0, 0 };
74#endif
75
76 argc--;
77 argv++;
78
79
80 /* not use inputing from terminal if usage: more > outfile */
81 if(isatty(fileno(stdout))) {
82 cin = fopen(CURRENT_TTY, "r");
83 if (!cin)
84 cin = xfopen(CONSOLE_DEV, "r");
85 please_display_more_prompt = 0;
86#ifdef BB_FEATURE_USE_TERMIOS
87 getTermSettings(fileno(cin), &initial_settings);
88 new_settings = initial_settings;
89 new_settings.c_lflag &= ~ICANON;
90 new_settings.c_lflag &= ~ECHO;
91#ifndef linux
92 /* Hmm, in linux c_cc[] not parsed if set ~ICANON */
93 new_settings.c_cc[VMIN] = 1;
94 new_settings.c_cc[VTIME] = 0;
95#endif
96 setTermSettings(fileno(cin), &new_settings);
97 atexit(set_tty_to_initial_mode);
98 (void) signal(SIGINT, gotsig);
99 (void) signal(SIGQUIT, gotsig);
100 (void) signal(SIGTERM, gotsig);
101#endif
102 }
103
104 do {
105 if (argc == 0) {
106 file = stdin;
107 } else
108 file = wfopen(*argv, "r");
109 if(file==0)
110 goto loop;
111
112 fstat(fileno(file), &st);
113
114 if(please_display_more_prompt>0)
115 please_display_more_prompt = 0;
116
117#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
118 ioctl(fileno(stdout), TIOCGWINSZ, &win);
119 if (win.ws_row > 4)
120 terminal_height = win.ws_row - 2;
121 if (win.ws_col > 0)
122 terminal_width = win.ws_col - 1;
123#endif
124 len=0;
125 lines = 0;
126 page_height = terminal_height;
127 while ((c = getc(file)) != EOF) {
128
129 if (please_display_more_prompt>0) {
130 len = printf("--More-- ");
131 if (file != stdin) {
132#if _FILE_OFFSET_BITS == 64
133 len += printf("(%d%% of %lld bytes)",
134 (int) (100 * ((double) ftell(file) /
135 (double) st.st_size)), (long long)st.st_size);
136#else
137 len += printf("(%d%% of %ld bytes)",
138 (int) (100 * ((double) ftell(file) /
139 (double) st.st_size)), (long)st.st_size);
140#endif
141 }
142
143 fflush(stdout);
144
145 /*
146 * We've just displayed the "--More--" prompt, so now we need
147 * to get input from the user.
148 */
149 input = getc(cin);
150#ifndef BB_FEATURE_USE_TERMIOS
151 printf("\033[A"); /* up cursor */
152#endif
153 /* Erase the "More" message */
154 putc('\r', stdout);
155 while (--len >= 0)
156 putc(' ', stdout);
157 putc('\r', stdout);
158 fflush(stdout);
159 len=0;
160 lines = 0;
161 page_height = terminal_height;
162 please_display_more_prompt = 0;
163
164 if (input == 'q')
165 goto end;
166 }
167
168 /*
169 * There are two input streams to worry about here:
170 *
171 * c : the character we are reading from the file being "mored"
172 * input : a character received from the keyboard
173 *
174 * If we hit a newline in the _file_ stream, we want to test and
175 * see if any characters have been hit in the _input_ stream. This
176 * allows the user to quit while in the middle of a file.
177 */
178 if (c == '\n') {
179 /* increment by just one line if we are at
180 * the end of this line */
181 if (input == '\n')
182 if(please_display_more_prompt==0)
183 please_display_more_prompt = 1;
184 /* Adjust the terminal height for any overlap, so that
185 * no lines get lost off the top. */
186 if (len >= terminal_width) {
187 int quot, rem;
188 quot = len / terminal_width;
189 rem = len - (quot * terminal_width);
190 if (quot) {
191 if (rem)
192 page_height-=quot;
193 else
194 page_height-=(quot-1);
195 }
196 }
197 if (++lines >= page_height) {
198 if(please_display_more_prompt==0)
199 please_display_more_prompt = 1;
200 }
201 len=0;
202 }
203 /*
204 * If we just read a newline from the file being 'mored' and any
205 * key other than a return is hit, scroll by one page
206 */
207 putc(c, stdout);
208 len++;
209 }
210 fclose(file);
211 fflush(stdout);
212loop:
213 argv++;
214 } while (--argc > 0);
215 end:
216 return 0;
217}
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