2000-02-08 19:58:47 +00:00
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/* vi: set sw=4 ts=4: */
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1999-10-06 00:30:51 +00:00
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/*
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* Mini more implementation for busybox
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*
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1999-11-12 01:30:18 +00:00
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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2004-03-15 08:29:22 +00:00
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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1999-11-12 01:30:18 +00:00
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*
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2003-07-14 21:21:08 +00:00
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* Latest version blended together by Erik Andersen <andersen@codepoet.org>,
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2004-03-15 08:29:22 +00:00
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* based on the original more implementation by Bruce, and code from the
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1999-11-12 01:30:18 +00:00
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* Debian boot-floppies team.
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1999-10-06 00:30:51 +00:00
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*
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2003-01-13 22:09:50 +00:00
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* Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
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2001-06-26 02:06:08 +00:00
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*
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2010-08-16 18:14:46 +00:00
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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1999-10-06 00:30:51 +00:00
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*/
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2011-04-11 01:29:49 +00:00
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//usage:#define more_trivial_usage
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//usage: "[FILE]..."
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//usage:#define more_full_usage "\n\n"
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//usage: "View FILE (or stdin) one screenful at a time"
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//usage:
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//usage:#define more_example_usage
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//usage: "$ dmesg | more\n"
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2007-05-26 19:00:18 +00:00
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#include "libbb.h"
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2016-04-21 14:26:30 +00:00
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#include "common_bufsiz.h"
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2000-04-28 00:18:56 +00:00
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2009-06-05 12:55:26 +00:00
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/* Support for FEATURE_USE_TERMIOS */
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2001-06-26 02:06:08 +00:00
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2007-05-31 21:31:56 +00:00
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struct globals {
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int cin_fileno;
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struct termios initial_settings;
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struct termios new_settings;
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2010-02-04 14:00:15 +00:00
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} FIX_ALIASING;
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2007-05-31 21:31:56 +00:00
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#define G (*(struct globals*)bb_common_bufsiz1)
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#define initial_settings (G.initial_settings)
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#define new_settings (G.new_settings )
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#define cin_fileno (G.cin_fileno )
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2016-04-21 16:18:48 +00:00
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#define INIT_G() do { setup_common_bufsiz(); } while (0)
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1999-10-12 22:26:06 +00:00
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2010-10-28 19:34:56 +00:00
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#define setTermSettings(fd, argp) \
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do { \
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if (ENABLE_FEATURE_USE_TERMIOS) \
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tcsetattr(fd, TCSANOW, argp); \
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} while (0)
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2007-05-31 21:31:56 +00:00
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#define getTermSettings(fd, argp) tcgetattr(fd, argp)
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2001-06-26 02:06:08 +00:00
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2008-07-05 09:18:54 +00:00
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static void gotsig(int sig UNUSED_PARAM)
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2001-06-26 02:06:08 +00:00
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{
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2010-10-28 19:34:56 +00:00
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/* bb_putchar_stderr doesn't use stdio buffering,
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* therefore it is safe in signal handler */
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bb_putchar_stderr('\n');
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2007-05-31 21:31:56 +00:00
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setTermSettings(cin_fileno, &initial_settings);
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2010-10-28 19:34:56 +00:00
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_exit(EXIT_FAILURE);
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2000-02-08 19:58:47 +00:00
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}
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2007-05-31 21:31:56 +00:00
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2007-08-15 20:42:52 +00:00
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#define CONVERTED_TAB_SIZE 8
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1999-11-09 01:47:36 +00:00
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2007-10-11 10:05:36 +00:00
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int more_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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2008-07-05 09:18:54 +00:00
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int more_main(int argc UNUSED_PARAM, char **argv)
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1999-10-05 16:24:54 +00:00
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{
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2010-07-12 01:14:17 +00:00
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int c = c; /* for compiler */
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2007-08-15 20:42:52 +00:00
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int lines;
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int input = 0;
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int spaces = 0;
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int please_display_more_prompt;
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2000-02-08 19:58:47 +00:00
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struct stat st;
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FILE *file;
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2004-03-27 09:49:57 +00:00
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FILE *cin;
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2007-08-15 20:42:52 +00:00
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int len;
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2008-05-18 22:28:26 +00:00
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unsigned terminal_width;
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unsigned terminal_height;
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2000-02-08 19:58:47 +00:00
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2007-05-31 21:31:56 +00:00
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INIT_G();
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2016-10-11 13:29:38 +00:00
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/* Parse options */
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/* Accepted but ignored: */
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/* -d Display help instead of ringing bell is pressed */
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/* -f Count logical lines (IOW: long lines are not folded) */
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/* -l Do not pause after any line containing a ^L (form feed) */
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/* -s Squeeze blank lines into one */
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/* -u Suppress underlining */
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getopt32(argv, "dflsu");
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argv += optind;
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2007-03-10 16:32:14 +00:00
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/* Another popular pager, most, detects when stdout
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* is not a tty and turns into cat. This makes sense. */
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if (!isatty(STDOUT_FILENO))
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return bb_cat(argv);
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2008-07-21 23:05:26 +00:00
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cin = fopen_for_read(CURRENT_TTY);
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2007-03-10 16:32:14 +00:00
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if (!cin)
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return bb_cat(argv);
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1999-10-19 22:26:25 +00:00
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|
2009-06-05 12:55:26 +00:00
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if (ENABLE_FEATURE_USE_TERMIOS) {
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cin_fileno = fileno(cin);
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getTermSettings(cin_fileno, &initial_settings);
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new_settings = initial_settings;
|
2012-01-15 22:00:13 +00:00
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|
new_settings.c_lflag &= ~(ICANON | ECHO);
|
2009-06-05 12:55:26 +00:00
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new_settings.c_cc[VMIN] = 1;
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new_settings.c_cc[VTIME] = 0;
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setTermSettings(cin_fileno, &new_settings);
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bb_signals(0
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+ (1 << SIGINT)
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+ (1 << SIGQUIT)
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+ (1 << SIGTERM)
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, gotsig);
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}
|
2001-06-26 02:06:08 +00:00
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do {
|
2006-12-10 01:57:29 +00:00
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file = stdin;
|
2007-03-10 16:32:14 +00:00
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if (*argv) {
|
2006-10-26 23:25:17 +00:00
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file = fopen_or_warn(*argv, "r");
|
2006-12-10 01:57:29 +00:00
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|
if (!file)
|
2007-03-10 16:32:14 +00:00
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continue;
|
2006-12-10 01:57:29 +00:00
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|
}
|
2001-12-06 07:24:29 +00:00
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st.st_size = 0;
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2001-06-26 02:06:08 +00:00
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|
fstat(fileno(file), &st);
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2000-02-08 19:58:47 +00:00
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2007-08-15 20:42:52 +00:00
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please_display_more_prompt = 0;
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2007-03-10 16:32:14 +00:00
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/* never returns w, h <= 1 */
|
2006-05-28 01:19:06 +00:00
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get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
|
2007-03-10 16:32:14 +00:00
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terminal_height -= 1;
|
2003-09-15 08:33:45 +00:00
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2006-12-10 01:57:29 +00:00
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len = 0;
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2001-02-23 01:39:26 +00:00
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lines = 0;
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2007-08-15 20:42:52 +00:00
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while (spaces || (c = getc(file)) != EOF) {
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int wrap;
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if (spaces)
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spaces--;
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loop_top:
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|
if (input != 'r' && please_display_more_prompt) {
|
2001-01-18 02:57:08 +00:00
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len = printf("--More-- ");
|
2011-03-07 01:01:52 +00:00
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|
|
if (st.st_size != 0) {
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|
uoff_t d = (uoff_t)st.st_size / 100;
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if (d == 0)
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d = 1;
|
2009-12-11 11:36:10 +00:00
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|
len += printf("(%u%% of %"OFF_FMT"u bytes)",
|
2011-03-07 01:01:52 +00:00
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|
(int) ((uoff_t)ftello(file) / d),
|
2006-12-10 01:57:29 +00:00
|
|
|
st.st_size);
|
2000-02-08 19:58:47 +00:00
|
|
|
}
|
2009-11-02 13:19:51 +00:00
|
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|
fflush_all();
|
2000-06-16 00:26:51 +00:00
|
|
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/*
|
|
|
|
* We've just displayed the "--More--" prompt, so now we need
|
|
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|
* to get input from the user.
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|
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|
*/
|
2007-08-15 20:42:52 +00:00
|
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|
for (;;) {
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|
input = getc(cin);
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|
input = tolower(input);
|
2009-06-05 12:55:26 +00:00
|
|
|
if (!ENABLE_FEATURE_USE_TERMIOS)
|
|
|
|
printf("\033[A"); /* cursor up */
|
2007-08-15 20:42:52 +00:00
|
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|
/* Erase the last message */
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|
printf("\r%*s\r", len, "");
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|
|
|
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|
|
|
/* Due to various multibyte escape
|
|
|
|
* sequences, it's not ok to accept
|
|
|
|
* any input as a command to scroll
|
|
|
|
* the screen. We only allow known
|
|
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|
* commands, else we show help msg. */
|
|
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|
if (input == ' ' || input == '\n' || input == 'q' || input == 'r')
|
|
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|
break;
|
|
|
|
len = printf("(Enter:next line Space:next page Q:quit R:show the rest)");
|
|
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|
}
|
2006-12-10 01:57:29 +00:00
|
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|
len = 0;
|
2001-02-23 01:39:26 +00:00
|
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lines = 0;
|
2007-08-15 20:42:52 +00:00
|
|
|
please_display_more_prompt = 0;
|
2001-04-12 20:51:01 +00:00
|
|
|
|
|
|
|
if (input == 'q')
|
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|
goto end;
|
2007-08-15 20:42:52 +00:00
|
|
|
|
|
|
|
/* The user may have resized the terminal.
|
|
|
|
* Re-read the dimensions. */
|
2009-06-05 12:55:26 +00:00
|
|
|
if (ENABLE_FEATURE_USE_TERMIOS) {
|
|
|
|
get_terminal_width_height(cin_fileno, &terminal_width, &terminal_height);
|
|
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|
terminal_height -= 1;
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|
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|
}
|
2000-02-08 19:58:47 +00:00
|
|
|
}
|
2000-06-16 00:26:51 +00:00
|
|
|
|
2007-08-15 20:42:52 +00:00
|
|
|
/* Crudely convert tabs into spaces, which are
|
|
|
|
* a bajillion times easier to deal with. */
|
|
|
|
if (c == '\t') {
|
2011-03-07 01:01:52 +00:00
|
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|
spaces = ((unsigned)~len) % CONVERTED_TAB_SIZE;
|
2007-08-15 20:42:52 +00:00
|
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|
c = ' ';
|
2007-12-24 14:09:19 +00:00
|
|
|
}
|
2007-08-15 20:42:52 +00:00
|
|
|
|
2004-03-15 08:29:22 +00:00
|
|
|
/*
|
2000-06-16 00:26:51 +00:00
|
|
|
* There are two input streams to worry about here:
|
|
|
|
*
|
2007-05-31 21:31:56 +00:00
|
|
|
* c : the character we are reading from the file being "mored"
|
|
|
|
* input: a character received from the keyboard
|
2000-06-16 00:26:51 +00:00
|
|
|
*
|
|
|
|
* If we hit a newline in the _file_ stream, we want to test and
|
|
|
|
* see if any characters have been hit in the _input_ stream. This
|
|
|
|
* allows the user to quit while in the middle of a file.
|
|
|
|
*/
|
2007-08-15 20:42:52 +00:00
|
|
|
wrap = (++len > terminal_width);
|
|
|
|
if (c == '\n' || wrap) {
|
|
|
|
/* Then outputting this character
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|
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|
* will move us to a new line. */
|
|
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|
if (++lines >= terminal_height || input == '\n')
|
|
|
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please_display_more_prompt = 1;
|
2006-12-10 01:57:29 +00:00
|
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|
len = 0;
|
2000-02-08 19:58:47 +00:00
|
|
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}
|
2007-08-15 20:42:52 +00:00
|
|
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if (c != '\n' && wrap) {
|
|
|
|
/* Then outputting this will also put a character on
|
|
|
|
* the beginning of that new line. Thus we first want to
|
|
|
|
* display the prompt (if any), so we skip the putchar()
|
|
|
|
* and go back to the top of the loop, without reading
|
|
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|
* a new character. */
|
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|
goto loop_top;
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|
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|
}
|
|
|
|
/* My small mind cannot fathom backspaces and UTF-8 */
|
|
|
|
putchar(c);
|
2010-12-13 13:31:59 +00:00
|
|
|
die_if_ferror_stdout(); /* if tty was destroyed (closed xterm, etc) */
|
1999-11-09 01:47:36 +00:00
|
|
|
}
|
2000-02-08 19:58:47 +00:00
|
|
|
fclose(file);
|
2009-11-02 13:19:51 +00:00
|
|
|
fflush_all();
|
2007-03-10 16:32:14 +00:00
|
|
|
} while (*argv && *++argv);
|
2006-12-10 01:57:29 +00:00
|
|
|
end:
|
2007-05-31 21:31:56 +00:00
|
|
|
setTermSettings(cin_fileno, &initial_settings);
|
2001-04-12 20:51:01 +00:00
|
|
|
return 0;
|
1999-10-05 16:24:54 +00:00
|
|
|
}
|