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 #ifdef CONFIG_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 /* CONFIG_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 /* not use inputing from terminal if usage: 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 #ifdef CONFIG_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 (void) signal(SIGINT, gotsig);
73 (void) signal(SIGQUIT, gotsig);
74 (void) signal(SIGTERM, gotsig);
84 file = fopen_or_warn(*argv, "r");
89 fstat(fileno(file), &st);
91 please_display_more_prompt &= ~1;
93 get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
94 if (terminal_height > 4)
96 if (terminal_width > 0)
101 page_height = terminal_height;
102 while ((c = getc(file)) != EOF) {
104 if ((please_display_more_prompt & 3) == 3) {
105 len = printf("--More-- ");
106 if (file != stdin && st.st_size > 0) {
107 #if _FILE_OFFSET_BITS == 64
108 len += printf("(%d%% of %lld bytes)",
109 (int) (100 * ((double) ftell(file) /
110 (double) st.st_size)), (long long)st.st_size);
112 len += printf("(%d%% of %ld bytes)",
113 (int) (100 * ((double) ftell(file) /
114 (double) st.st_size)), (long)st.st_size);
121 * We've just displayed the "--More--" prompt, so now we need
122 * to get input from the user.
125 #ifndef CONFIG_FEATURE_USE_TERMIOS
126 printf("\033[A"); /* up cursor */
128 /* Erase the "More" message */
135 page_height = terminal_height;
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);
167 page_height-=(quot-1);
170 if (++lines >= page_height) {
171 please_display_more_prompt |= 1;
176 * If we just read a newline from the file being 'mored' and any
177 * key other than a return is hit, scroll by one page
186 } while (--argc > 0);