1 /* vi: set sw=4 ts=4: */
3 * Mini more implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
8 * Latest version blended together by Erik Andersen <andersen@codepoet.org>,
9 * based on the original more implementation by Bruce, and code from the
10 * Debian boot-floppies team.
12 * Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
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.
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.
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
35 #include <sys/ioctl.h>
40 #ifdef CONFIG_FEATURE_USE_TERMIOS
42 #define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
43 #define getTermSettings(fd,argp) tcgetattr(fd, argp);
45 static struct termios initial_settings, new_settings;
47 static void set_tty_to_initial_mode(void)
49 setTermSettings(fileno(cin), &initial_settings);
52 static void gotsig(int sig)
57 #endif /* CONFIG_FEATURE_USE_TERMIOS */
60 static int terminal_width = 79; /* not 80 in case terminal has linefold bug */
61 static int terminal_height = 24;
64 extern int more_main(int argc, char **argv)
66 int c, lines, input = 0;
67 int please_display_more_prompt = -1;
76 /* not use inputing from terminal if usage: more > outfile */
77 if(isatty(fileno(stdout))) {
78 cin = fopen(CURRENT_TTY, "r");
80 cin = bb_xfopen(CONSOLE_DEV, "r");
81 please_display_more_prompt = 0;
82 #ifdef CONFIG_FEATURE_USE_TERMIOS
83 getTermSettings(fileno(cin), &initial_settings);
84 new_settings = initial_settings;
85 new_settings.c_lflag &= ~ICANON;
86 new_settings.c_lflag &= ~ECHO;
88 /* Hmm, in linux c_cc[] not parsed if set ~ICANON */
89 new_settings.c_cc[VMIN] = 1;
90 new_settings.c_cc[VTIME] = 0;
92 setTermSettings(fileno(cin), &new_settings);
93 atexit(set_tty_to_initial_mode);
94 (void) signal(SIGINT, gotsig);
95 (void) signal(SIGQUIT, gotsig);
96 (void) signal(SIGTERM, gotsig);
104 file = bb_wfopen(*argv, "r");
109 fstat(fileno(file), &st);
111 if(please_display_more_prompt>0)
112 please_display_more_prompt = 0;
114 get_terminal_width_height(0, &terminal_width, &terminal_height);
115 if (terminal_height > 4)
116 terminal_height -= 2;
117 if (terminal_width > 0)
122 page_height = terminal_height;
123 while ((c = getc(file)) != EOF) {
125 if (please_display_more_prompt>0) {
126 len = printf("--More-- ");
127 if (file != stdin && st.st_size > 0) {
128 #if _FILE_OFFSET_BITS == 64
129 len += printf("(%d%% of %lld bytes)",
130 (int) (100 * ((double) ftell(file) /
131 (double) st.st_size)), (long long)st.st_size);
133 len += printf("(%d%% of %ld bytes)",
134 (int) (100 * ((double) ftell(file) /
135 (double) st.st_size)), (long)st.st_size);
142 * We've just displayed the "--More--" prompt, so now we need
143 * to get input from the user.
146 #ifndef CONFIG_FEATURE_USE_TERMIOS
147 printf("\033[A"); /* up cursor */
149 /* Erase the "More" message */
157 page_height = terminal_height;
158 please_display_more_prompt = 0;
165 * There are two input streams to worry about here:
167 * c : the character we are reading from the file being "mored"
168 * input : a character received from the keyboard
170 * If we hit a newline in the _file_ stream, we want to test and
171 * see if any characters have been hit in the _input_ stream. This
172 * allows the user to quit while in the middle of a file.
175 /* increment by just one line if we are at
176 * the end of this line */
178 if(please_display_more_prompt==0)
179 please_display_more_prompt = 1;
180 /* Adjust the terminal height for any overlap, so that
181 * no lines get lost off the top. */
182 if (len >= terminal_width) {
184 quot = len / terminal_width;
185 rem = len - (quot * terminal_width);
190 page_height-=(quot-1);
193 if (++lines >= page_height) {
194 if(please_display_more_prompt==0)
195 please_display_more_prompt = 1;
200 * If we just read a newline from the file being 'mored' and any
201 * key other than a return is hit, scroll by one page
210 } while (--argc > 0);