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) 1999-2004 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 * Licensed under GPLv2 or later, see file License in this tarball for details.
20 #if ENABLE_FEATURE_USE_TERMIOS
21 static int cin_fileno;
23 #define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
24 #define getTermSettings(fd, argp) tcgetattr(fd, argp);
26 static struct termios initial_settings, new_settings;
28 static void set_tty_to_initial_mode(void)
30 setTermSettings(cin_fileno, &initial_settings);
33 static void gotsig(int sig)
38 #endif /* FEATURE_USE_TERMIOS */
41 int more_main(int argc, char **argv)
43 int c, lines, input = 0;
44 int please_display_more_prompt = 0;
56 /* use input from terminal unless we do "more >outfile" */
57 if (isatty(STDOUT_FILENO)) {
58 cin = fopen(CURRENT_TTY, "r");
60 cin = xfopen(CONSOLE_DEV, "r");
61 please_display_more_prompt = 2;
62 #if ENABLE_FEATURE_USE_TERMIOS
63 cin_fileno = fileno(cin);
64 getTermSettings(cin_fileno, &initial_settings);
65 new_settings = initial_settings;
66 new_settings.c_lflag &= ~ICANON;
67 new_settings.c_lflag &= ~ECHO;
68 new_settings.c_cc[VMIN] = 1;
69 new_settings.c_cc[VTIME] = 0;
70 setTermSettings(cin_fileno, &new_settings);
71 atexit(set_tty_to_initial_mode);
72 signal(SIGINT, gotsig);
73 signal(SIGQUIT, gotsig);
74 signal(SIGTERM, gotsig);
81 file = fopen_or_warn(*argv, "r");
87 fstat(fileno(file), &st);
89 please_display_more_prompt &= ~1;
91 get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
92 if (terminal_height > 4)
94 if (terminal_width > 0)
99 page_height = terminal_height;
100 while ((c = getc(file)) != EOF) {
102 if ((please_display_more_prompt & 3) == 3) {
103 len = printf("--More-- ");
104 if (file != stdin && st.st_size > 0) {
105 len += printf("(%d%% of %"OFF_FMT"d bytes)",
106 (int) (ftello(file)*100 / st.st_size),
112 * We've just displayed the "--More--" prompt, so now we need
113 * to get input from the user.
116 #if !ENABLE_FEATURE_USE_TERMIOS
117 printf("\033[A"); /* up cursor */
119 /* Erase the "More" message */
120 printf("\r%*s\r", len, "");
123 page_height = terminal_height;
124 please_display_more_prompt &= ~1;
131 * There are two input streams to worry about here:
133 * c : the character we are reading from the file being "mored"
134 * input : a character received from the keyboard
136 * If we hit a newline in the _file_ stream, we want to test and
137 * see if any characters have been hit in the _input_ stream. This
138 * allows the user to quit while in the middle of a file.
141 /* increment by just one line if we are at
142 * the end of this line */
144 please_display_more_prompt |= 1;
145 /* Adjust the terminal height for any overlap, so that
146 * no lines get lost off the top. */
147 if (len >= terminal_width) {
149 quot = len / terminal_width;
150 rem = len - (quot * terminal_width);
155 page_height -= (quot - 1);
158 if (++lines >= page_height) {
159 please_display_more_prompt |= 1;
164 * If we just read a newline from the file being 'mored' and any
165 * key other than a return is hit, scroll by one page
174 } while (--argc > 0);