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.
18 #if ENABLE_FEATURE_USE_TERMIOS
20 #endif /* FEATURE_USE_TERMIOS */
23 #if ENABLE_FEATURE_USE_TERMIOS
27 struct termios initial_settings;
28 struct termios new_settings;
30 #define G (*(struct globals*)bb_common_bufsiz1)
31 //#define G (*ptr_to_globals)
32 #define initial_settings (G.initial_settings)
33 #define new_settings (G.new_settings )
34 #define cin_fileno (G.cin_fileno )
35 #define INIT_G() ((void)0)
36 //#define INIT_G() PTR_TO_GLOBALS = xzalloc(sizeof(G))
38 #define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
39 #define getTermSettings(fd, argp) tcgetattr(fd, argp)
41 static void gotsig(int sig)
44 setTermSettings(cin_fileno, &initial_settings);
48 #else /* !FEATURE_USE_TERMIOS */
49 #define INIT_G() ((void)0)
50 #define setTermSettings(fd, argp) ((void)0)
51 #endif /* FEATURE_USE_TERMIOS */
54 int more_main(int argc, char **argv);
55 int more_main(int argc, char **argv)
57 int c, lines, input = 0;
58 int please_display_more_prompt = 0;
69 /* Another popular pager, most, detects when stdout
70 * is not a tty and turns into cat. This makes sense. */
71 if (!isatty(STDOUT_FILENO))
73 cin = fopen(CURRENT_TTY, "r");
77 #if ENABLE_FEATURE_USE_TERMIOS
78 cin_fileno = fileno(cin);
79 getTermSettings(cin_fileno, &initial_settings);
80 new_settings = initial_settings;
81 new_settings.c_lflag &= ~ICANON;
82 new_settings.c_lflag &= ~ECHO;
83 new_settings.c_cc[VMIN] = 1;
84 new_settings.c_cc[VTIME] = 0;
85 setTermSettings(cin_fileno, &new_settings);
86 signal(SIGINT, gotsig);
87 signal(SIGQUIT, gotsig);
88 signal(SIGTERM, gotsig);
90 please_display_more_prompt = 2;
95 file = fopen_or_warn(*argv, "r");
100 fstat(fileno(file), &st);
102 please_display_more_prompt &= ~1;
103 /* never returns w, h <= 1 */
104 get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
106 terminal_height -= 1;
110 page_height = terminal_height;
111 while ((c = getc(file)) != EOF) {
112 if ((please_display_more_prompt & 3) == 3) {
113 len = printf("--More-- ");
114 if (/*file != stdin &&*/ st.st_size > 0) {
115 len += printf("(%d%% of %"OFF_FMT"d bytes)",
116 (int) (ftello(file)*100 / st.st_size),
122 * We've just displayed the "--More--" prompt, so now we need
123 * to get input from the user.
126 #if !ENABLE_FEATURE_USE_TERMIOS
127 printf("\033[A"); /* up cursor */
129 /* Erase the "More" message */
130 printf("\r%*s\r", len, "");
133 /* Bottom line on page will become top line
134 * after one page forward. Thus -1: */
135 page_height = terminal_height - 1;
136 please_display_more_prompt &= ~1;
143 * There are two input streams to worry about here:
145 * c : the character we are reading from the file being "mored"
146 * input: a character received from the keyboard
148 * If we hit a newline in the _file_ stream, we want to test and
149 * see if any characters have been hit in the _input_ stream. This
150 * allows the user to quit while in the middle of a file.
153 /* increment by just one line if we are at
154 * the end of this line */
156 please_display_more_prompt |= 1;
157 /* Adjust the terminal height for any overlap, so that
158 * no lines get lost off the top. */
159 if (len >= terminal_width) {
161 quot = len / terminal_width;
162 rem = len - (quot * terminal_width);
163 page_height -= (quot - 1);
167 if (++lines >= page_height) {
168 please_display_more_prompt |= 1;
173 * If we just read a newline from the file being 'mored' and any
174 * key other than a return is hit, scroll by one page
177 /* My small mind cannot fathom tabs, backspaces,
183 } while (*argv && *++argv);
185 setTermSettings(cin_fileno, &initial_settings);