blob: 549a417307e6d307f8cbb93f6522d19de25e95e8 [file] [log] [blame]
Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersen4bea32a1999-10-06 00:30:51 +00002/*
3 * Mini more implementation for busybox
4 *
Eric Andersenc4996011999-10-20 22:08:37 +00005 *
Eric Andersen96bcfd31999-11-12 01:30:18 +00006 * 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.
Eric Andersen4bea32a1999-10-06 00:30:51 +000011 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
27
Eric Andersencc8ed391999-10-05 16:24:54 +000028#include "internal.h"
29#include <stdio.h>
Eric Andersenf5a38381999-10-19 22:26:25 +000030#include <fcntl.h>
Eric Andersen4bea32a1999-10-06 00:30:51 +000031#include <signal.h>
Eric Andersen50d63601999-11-09 01:47:36 +000032#include <sys/ioctl.h>
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000033#define BB_DECLARE_EXTERN
34#define bb_need_help
35#include "messages.c"
Eric Andersen3cf52d11999-10-12 22:26:06 +000036
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000037static const char more_usage[] = "more [FILE ...]\n"
38#ifndef BB_FEATURE_TRIVIAL_HELP
39 "\nMore is a filter for viewing FILE one screenful at a time.\n"
40#endif
41 ;
Eric Andersencc8ed391999-10-05 16:24:54 +000042
Erik Andersen1d1d9502000-04-21 01:26:49 +000043/* ED: sparc termios is broken: revert back to old termio handling. */
Eric Andersen50d63601999-11-09 01:47:36 +000044#ifdef BB_FEATURE_USE_TERMIOS
Eric Andersenf5a38381999-10-19 22:26:25 +000045
Erik Andersen1d1d9502000-04-21 01:26:49 +000046#if #cpu(sparc)
47# include <termio.h>
48# define termios termio
49# define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
50# define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
51#else
52# include <termios.h>
53# define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
54# define getTermSettings(fd,argp) tcgetattr(fd, argp);
55#endif
Eric Andersen3cf52d11999-10-12 22:26:06 +000056
Erik Andersene49d5ec2000-02-08 19:58:47 +000057FILE *cin;
Erik Andersen4f3f7572000-04-28 00:18:56 +000058
Erik Andersen1d1d9502000-04-21 01:26:49 +000059struct termios initial_settings, new_settings;
Eric Andersen3cf52d11999-10-12 22:26:06 +000060
Erik Andersene49d5ec2000-02-08 19:58:47 +000061void gotsig(int sig)
62{
Erik Andersen1d1d9502000-04-21 01:26:49 +000063 setTermSettings(fileno(cin), &initial_settings);
Erik Andersene49d5ec2000-02-08 19:58:47 +000064 fprintf(stdout, "\n");
65 exit(TRUE);
66}
Eric Andersen3cf52d11999-10-12 22:26:06 +000067#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000068
Eric Andersen50d63601999-11-09 01:47:36 +000069
70
Erik Andersene49d5ec2000-02-08 19:58:47 +000071#define TERMINAL_WIDTH 79 /* not 80 in case terminal has linefold bug */
Eric Andersen50d63601999-11-09 01:47:36 +000072#define TERMINAL_HEIGHT 24
73
74
Eric Andersen96bcfd31999-11-12 01:30:18 +000075#if defined BB_FEATURE_AUTOWIDTH
Erik Andersen4f3f7572000-04-28 00:18:56 +000076#ifdef BB_FEATURE_USE_TERMIOS
Eric Andersen86ab8a32000-06-02 03:21:42 +000077static int terminal_width = TERMINAL_WIDTH;
Erik Andersen4f3f7572000-04-28 00:18:56 +000078#endif
Eric Andersen86ab8a32000-06-02 03:21:42 +000079static int terminal_height = TERMINAL_HEIGHT;
Eric Andersen50d63601999-11-09 01:47:36 +000080#else
81#define terminal_width TERMINAL_WIDTH
82#define terminal_height TERMINAL_HEIGHT
83#endif
84
85
86
Eric Andersen4bea32a1999-10-06 00:30:51 +000087extern int more_main(int argc, char **argv)
Eric Andersencc8ed391999-10-05 16:24:54 +000088{
Erik Andersene49d5ec2000-02-08 19:58:47 +000089 int c, lines = 0, input = 0;
Mark Whitleyb9913952000-06-16 00:26:51 +000090 int please_display_more_prompt = 0;
Erik Andersene49d5ec2000-02-08 19:58:47 +000091 struct stat st;
92 FILE *file;
93
Erik Andersen4f3f7572000-04-28 00:18:56 +000094#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
Erik Andersene49d5ec2000-02-08 19:58:47 +000095 struct winsize win = { 0, 0 };
Eric Andersen50d63601999-11-09 01:47:36 +000096#endif
Eric Andersen4bea32a1999-10-06 00:30:51 +000097
Erik Andersene49d5ec2000-02-08 19:58:47 +000098 argc--;
Eric Andersen4bea32a1999-10-06 00:30:51 +000099 argv++;
Eric Andersen4bea32a1999-10-06 00:30:51 +0000100
Erik Andersene49d5ec2000-02-08 19:58:47 +0000101 if (argc > 0
Erik Andersen7ab9c7e2000-05-12 19:41:47 +0000102 && (strcmp(*argv, dash_dash_help) == 0 || strcmp(*argv, "-h") == 0)) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000103 usage(more_usage);
104 }
105 do {
106 if (argc == 0) {
107 file = stdin;
108 } else
109 file = fopen(*argv, "r");
110
111 if (file == NULL) {
112 perror(*argv);
113 exit(FALSE);
114 }
115 fstat(fileno(file), &st);
116
117#ifdef BB_FEATURE_USE_TERMIOS
118 cin = fopen("/dev/tty", "r");
119 if (!cin)
120 cin = fopen("/dev/console", "r");
Erik Andersen1d1d9502000-04-21 01:26:49 +0000121 getTermSettings(fileno(cin), &initial_settings);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000122 new_settings = initial_settings;
Erik Andersene90f4042000-04-21 21:53:58 +0000123 new_settings.c_cc[VMIN] = 1;
124 new_settings.c_cc[VTIME] = 0;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000125 new_settings.c_lflag &= ~ICANON;
126 new_settings.c_lflag &= ~ECHO;
Erik Andersen1d1d9502000-04-21 01:26:49 +0000127 setTermSettings(fileno(cin), &new_settings);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000128
129#ifdef BB_FEATURE_AUTOWIDTH
130 ioctl(fileno(stdout), TIOCGWINSZ, &win);
131 if (win.ws_row > 4)
132 terminal_height = win.ws_row - 2;
133 if (win.ws_col > 0)
134 terminal_width = win.ws_col - 1;
135#endif
136
137 (void) signal(SIGINT, gotsig);
138 (void) signal(SIGQUIT, gotsig);
139 (void) signal(SIGTERM, gotsig);
140
141#endif
142 while ((c = getc(file)) != EOF) {
Mark Whitleyb9913952000-06-16 00:26:51 +0000143 if (please_display_more_prompt) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000144 int len = 0;
145
Mark Whitleyb9913952000-06-16 00:26:51 +0000146 please_display_more_prompt = 0;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000147 lines = 0;
148 len = fprintf(stdout, "--More-- ");
149 if (file != stdin) {
150 len += fprintf(stdout, "(%d%% of %ld bytes)",
151 (int) (100 *
152 ((double) ftell(file) /
153 (double) st.st_size)),
154 st.st_size);
155 }
156 len += fprintf(stdout, "%s",
157#ifdef BB_FEATURE_USE_TERMIOS
158 ""
159#else
160 "\n"
161#endif
162 );
163
164 fflush(stdout);
Mark Whitleyb9913952000-06-16 00:26:51 +0000165
166 /*
167 * We've just displayed the "--More--" prompt, so now we need
168 * to get input from the user.
169 */
Erik Andersen4f3f7572000-04-28 00:18:56 +0000170#ifdef BB_FEATURE_USE_TERMIOS
Erik Andersene49d5ec2000-02-08 19:58:47 +0000171 input = getc(cin);
Erik Andersen4f3f7572000-04-28 00:18:56 +0000172#else
173 input = getc(stdin);
174#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000175
176#ifdef BB_FEATURE_USE_TERMIOS
177 /* Erase the "More" message */
178 while (--len >= 0)
179 putc('\b', stdout);
180 while (++len <= terminal_width)
181 putc(' ', stdout);
182 while (--len >= 0)
183 putc('\b', stdout);
184 fflush(stdout);
185#endif
186
187 }
Mark Whitleyb9913952000-06-16 00:26:51 +0000188
189 /*
190 * There are two input streams to worry about here:
191 *
192 * c : the character we are reading from the file being "mored"
193 * input : a character received from the keyboard
194 *
195 * If we hit a newline in the _file_ stream, we want to test and
196 * see if any characters have been hit in the _input_ stream. This
197 * allows the user to quit while in the middle of a file.
198 */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000199 if (c == '\n') {
200 switch (input) {
201 case 'q':
202 goto end;
203 case '\n':
204 /* increment by just one line if we are at
205 * the end of this line*/
Mark Whitleyb9913952000-06-16 00:26:51 +0000206 please_display_more_prompt = 1;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000207 break;
208 }
209 if (++lines == terminal_height)
Mark Whitleyb9913952000-06-16 00:26:51 +0000210 please_display_more_prompt = 1;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000211 }
Mark Whitleyb9913952000-06-16 00:26:51 +0000212 /* If any key other than a return is hit, scroll by one page */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000213 putc(c, stdout);
214 }
215 fclose(file);
216 fflush(stdout);
217
218 argv++;
219 } while (--argc > 0);
220 end:
221#ifdef BB_FEATURE_USE_TERMIOS
222 gotsig(0);
223#endif
224 exit(TRUE);
225}