1 /* vi: set sw=4 ts=4: */
3 * Mini more implementation for busybox
6 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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.
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.
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.
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
33 #include <sys/ioctl.h>
34 #define BB_DECLARE_EXTERN
38 /* ED: sparc termios is broken: revert back to old termio handling. */
39 #ifdef BB_FEATURE_USE_TERMIOS
42 # define termios termio
43 # define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
44 # define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
47 # define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
48 # define getTermSettings(fd,argp) tcgetattr(fd, argp);
53 static struct termios initial_settings, new_settings;
55 static void gotsig(int sig)
57 setTermSettings(fileno(cin), &initial_settings);
61 #endif /* BB_FEATURE_USE_TERMIOS */
64 static int terminal_width = 79; /* not 80 in case terminal has linefold bug */
65 static int terminal_height = 24;
68 extern int more_main(int argc, char **argv)
70 int c, lines = 0, input = 0;
71 int please_display_more_prompt = 0;
75 #if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
76 struct winsize win = { 0, 0, 0, 0 };
86 file = xfopen(*argv, "r");
88 fstat(fileno(file), &st);
90 #ifdef BB_FEATURE_USE_TERMIOS
91 cin = fopen("/dev/tty", "r");
93 cin = fopen("/dev/console", "r");
94 getTermSettings(fileno(cin), &initial_settings);
95 new_settings = initial_settings;
96 new_settings.c_cc[VMIN] = 1;
97 new_settings.c_cc[VTIME] = 0;
98 new_settings.c_lflag &= ~ICANON;
99 new_settings.c_lflag &= ~ECHO;
100 setTermSettings(fileno(cin), &new_settings);
102 # ifdef BB_FEATURE_AUTOWIDTH
103 ioctl(fileno(stdout), TIOCGWINSZ, &win);
105 terminal_height = win.ws_row - 2;
107 terminal_width = win.ws_col - 1;
110 (void) signal(SIGINT, gotsig);
111 (void) signal(SIGQUIT, gotsig);
112 (void) signal(SIGTERM, gotsig);
115 while ((c = getc(file)) != EOF) {
116 if (please_display_more_prompt) {
119 please_display_more_prompt = 0;
121 len = printf("--More-- ");
123 #if _FILE_OFFSET_BITS == 64
124 len += printf("(%d%% of %lld bytes)",
126 len += printf("(%d%% of %ld bytes)",
129 ((double) ftell(file) /
130 (double) st.st_size)),
134 #ifdef BB_FEATURE_USE_TERMIOS
144 * We've just displayed the "--More--" prompt, so now we need
145 * to get input from the user.
147 #ifdef BB_FEATURE_USE_TERMIOS
153 #ifdef BB_FEATURE_USE_TERMIOS
154 /* Erase the "More" message */
157 while (++len <= terminal_width)
167 * There are two input streams to worry about here:
169 * c : the character we are reading from the file being "mored"
170 * input : a character received from the keyboard
172 * If we hit a newline in the _file_ stream, we want to test and
173 * see if any characters have been hit in the _input_ stream. This
174 * allows the user to quit while in the middle of a file.
181 /* increment by just one line if we are at
182 * the end of this line*/
183 please_display_more_prompt = 1;
186 if (++lines == terminal_height)
187 please_display_more_prompt = 1;
190 * If we just read a newline from the file being 'mored' and any
191 * key other than a return is hit, scroll by one page
199 } while (--argc > 0);
201 #ifdef BB_FEATURE_USE_TERMIOS