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 INIT_G() ((void)0)
33 //#define INIT_G() PTR_TO_GLOBALS = xzalloc(sizeof(G))
34 #define initial_settings (G.initial_settings)
35 #define new_settings (G.new_settings )
36 #define cin_fileno (G.cin_fileno )
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 */
53 #define CONVERTED_TAB_SIZE 8
55 int more_main(int argc, char **argv);
56 int more_main(int argc, char **argv)
58 int c = c; /* for gcc */
62 int please_display_more_prompt;
73 /* Another popular pager, most, detects when stdout
74 * is not a tty and turns into cat. This makes sense. */
75 if (!isatty(STDOUT_FILENO))
77 cin = fopen(CURRENT_TTY, "r");
81 #if ENABLE_FEATURE_USE_TERMIOS
82 cin_fileno = fileno(cin);
83 getTermSettings(cin_fileno, &initial_settings);
84 new_settings = initial_settings;
85 new_settings.c_lflag &= ~ICANON;
86 new_settings.c_lflag &= ~ECHO;
87 new_settings.c_cc[VMIN] = 1;
88 new_settings.c_cc[VTIME] = 0;
89 setTermSettings(cin_fileno, &new_settings);
90 signal(SIGINT, gotsig);
91 signal(SIGQUIT, gotsig);
92 signal(SIGTERM, gotsig);
98 file = fopen_or_warn(*argv, "r");
103 fstat(fileno(file), &st);
105 please_display_more_prompt = 0;
106 /* never returns w, h <= 1 */
107 get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
108 terminal_height -= 1;
112 while (spaces || (c = getc(file)) != EOF) {
117 if (input != 'r' && please_display_more_prompt) {
118 len = printf("--More-- ");
119 if (st.st_size > 0) {
120 len += printf("(%d%% of %"OFF_FMT"d bytes)",
121 (int) (ftello(file)*100 / st.st_size),
127 * We've just displayed the "--More--" prompt, so now we need
128 * to get input from the user.
132 input = tolower(input);
133 #if !ENABLE_FEATURE_USE_TERMIOS
134 printf("\033[A"); /* up cursor */
136 /* Erase the last message */
137 printf("\r%*s\r", len, "");
139 /* Due to various multibyte escape
140 * sequences, it's not ok to accept
141 * any input as a command to scroll
142 * the screen. We only allow known
143 * commands, else we show help msg. */
144 if (input == ' ' || input == '\n' || input == 'q' || input == 'r')
146 len = printf("(Enter:next line Space:next page Q:quit R:show the rest)");
150 please_display_more_prompt = 0;
155 /* The user may have resized the terminal.
156 * Re-read the dimensions. */
157 #if ENABLE_FEATURE_USE_TERMIOS
158 get_terminal_width_height(cin_fileno, &terminal_width, &terminal_height);
159 terminal_height -= 1;
163 /* Crudely convert tabs into spaces, which are
164 * a bajillion times easier to deal with. */
166 spaces = CONVERTED_TAB_SIZE - 1;
171 * There are two input streams to worry about here:
173 * c : the character we are reading from the file being "mored"
174 * input: a character received from the keyboard
176 * If we hit a newline in the _file_ stream, we want to test and
177 * see if any characters have been hit in the _input_ stream. This
178 * allows the user to quit while in the middle of a file.
180 wrap = (++len > terminal_width);
181 if (c == '\n' || wrap) {
182 /* Then outputting this character
183 * will move us to a new line. */
184 if (++lines >= terminal_height || input == '\n')
185 please_display_more_prompt = 1;
188 if (c != '\n' && wrap) {
189 /* Then outputting this will also put a character on
190 * the beginning of that new line. Thus we first want to
191 * display the prompt (if any), so we skip the putchar()
192 * and go back to the top of the loop, without reading
193 * a new character. */
196 /* My small mind cannot fathom backspaces and UTF-8 */
201 } while (*argv && *++argv);
203 setTermSettings(cin_fileno, &initial_settings);