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);
42 int more_main(int argc, char **argv)
44 int c, lines, input = 0;
45 int please_display_more_prompt = 0;
54 /* Another popular pager, most, detects when stdout
55 * is not a tty and turns into cat. This makes sense. */
56 if (!isatty(STDOUT_FILENO))
58 cin = fopen(CURRENT_TTY, "r");
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);
76 please_display_more_prompt = 2;
81 file = fopen_or_warn(*argv, "r");
86 fstat(fileno(file), &st);
88 please_display_more_prompt &= ~1;
89 /* never returns w, h <= 1 */
90 get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
96 page_height = terminal_height;
97 while ((c = getc(file)) != EOF) {
99 if ((please_display_more_prompt & 3) == 3) {
100 len = printf("--More-- ");
101 if (/*file != stdin &&*/ st.st_size > 0) {
102 len += printf("(%d%% of %"OFF_FMT"d bytes)",
103 (int) (ftello(file)*100 / st.st_size),
109 * We've just displayed the "--More--" prompt, so now we need
110 * to get input from the user.
113 #if !ENABLE_FEATURE_USE_TERMIOS
114 printf("\033[A"); /* up cursor */
116 /* Erase the "More" message */
117 printf("\r%*s\r", len, "");
120 /* Bottom line on page will become top line
121 * after one page forward. Thus -1: */
122 page_height = terminal_height - 1;
123 please_display_more_prompt &= ~1;
130 * There are two input streams to worry about here:
132 * c : the character we are reading from the file being "mored"
133 * input : a character received from the keyboard
135 * If we hit a newline in the _file_ stream, we want to test and
136 * see if any characters have been hit in the _input_ stream. This
137 * allows the user to quit while in the middle of a file.
140 /* increment by just one line if we are at
141 * the end of this line */
143 please_display_more_prompt |= 1;
144 /* Adjust the terminal height for any overlap, so that
145 * no lines get lost off the top. */
146 if (len >= terminal_width) {
148 quot = len / terminal_width;
149 rem = len - (quot * terminal_width);
150 page_height -= (quot - 1);
154 if (++lines >= page_height) {
155 please_display_more_prompt |= 1;
160 * If we just read a newline from the file being 'mored' and any
161 * key other than a return is hit, scroll by one page
164 /* My small mind cannot fathom tabs, backspaces,
170 } while (*argv && *++argv);