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fill whole 1st screen (was "screen sans one line"); fall back to cat if redirected or no ctty less: fall back to cat if no ctty (was exiting) resize: cosmetics
174 lines
4.4 KiB
C
174 lines
4.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini more implementation for busybox
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Latest version blended together by Erik Andersen <andersen@codepoet.org>,
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* based on the original more implementation by Bruce, and code from the
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* Debian boot-floppies team.
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*
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* Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
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*
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* Licensed under GPLv2 or later, see file License in this tarball for details.
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*/
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#include "busybox.h"
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#if ENABLE_FEATURE_USE_TERMIOS
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static int cin_fileno;
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#include <termios.h>
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#define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
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#define getTermSettings(fd, argp) tcgetattr(fd, argp);
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static struct termios initial_settings, new_settings;
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static void set_tty_to_initial_mode(void)
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{
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setTermSettings(cin_fileno, &initial_settings);
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}
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static void gotsig(int sig)
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{
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putchar('\n');
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exit(EXIT_FAILURE);
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}
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#endif /* FEATURE_USE_TERMIOS */
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int more_main(int argc, char **argv);
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int more_main(int argc, char **argv)
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{
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int c, lines, input = 0;
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int please_display_more_prompt = 0;
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struct stat st;
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FILE *file;
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FILE *cin;
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int len, page_height;
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int terminal_width;
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int terminal_height;
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argv++;
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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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cin = fopen(CURRENT_TTY, "r");
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if (!cin)
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return bb_cat(argv);
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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;
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new_settings.c_lflag &= ~ICANON;
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new_settings.c_lflag &= ~ECHO;
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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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atexit(set_tty_to_initial_mode);
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signal(SIGINT, gotsig);
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signal(SIGQUIT, gotsig);
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signal(SIGTERM, gotsig);
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#endif
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please_display_more_prompt = 2;
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do {
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file = stdin;
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if (*argv) {
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file = fopen_or_warn(*argv, "r");
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if (!file)
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continue;
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}
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st.st_size = 0;
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fstat(fileno(file), &st);
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please_display_more_prompt &= ~1;
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/* never returns w, h <= 1 */
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get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
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terminal_width -= 1;
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terminal_height -= 1;
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len = 0;
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lines = 0;
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page_height = terminal_height;
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while ((c = getc(file)) != EOF) {
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if ((please_display_more_prompt & 3) == 3) {
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len = printf("--More-- ");
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if (/*file != stdin &&*/ st.st_size > 0) {
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len += printf("(%d%% of %"OFF_FMT"d bytes)",
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(int) (ftello(file)*100 / st.st_size),
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st.st_size);
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}
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fflush(stdout);
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/*
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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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input = getc(cin);
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#if !ENABLE_FEATURE_USE_TERMIOS
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printf("\033[A"); /* up cursor */
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#endif
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/* Erase the "More" message */
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printf("\r%*s\r", len, "");
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len = 0;
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lines = 0;
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/* Bottom line on page will become top line
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* after one page forward. Thus -1: */
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page_height = terminal_height - 1;
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please_display_more_prompt &= ~1;
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if (input == 'q')
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goto end;
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}
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/*
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* There are two input streams to worry about here:
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*
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* c : the character we are reading from the file being "mored"
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* input : a character received from the keyboard
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*
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* If we hit a newline in the _file_ stream, we want to test and
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* see if any characters have been hit in the _input_ stream. This
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* allows the user to quit while in the middle of a file.
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*/
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if (c == '\n') {
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/* increment by just one line if we are at
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* the end of this line */
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if (input == '\n')
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please_display_more_prompt |= 1;
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/* Adjust the terminal height for any overlap, so that
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* no lines get lost off the top. */
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if (len >= terminal_width) {
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int quot, rem;
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quot = len / terminal_width;
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rem = len - (quot * terminal_width);
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page_height -= (quot - 1);
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if (rem)
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page_height--;
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}
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if (++lines >= page_height) {
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please_display_more_prompt |= 1;
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}
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len = 0;
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}
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/*
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* If we just read a newline from the file being 'mored' and any
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* key other than a return is hit, scroll by one page
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*/
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putc(c, stdout);
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/* My small mind cannot fathom tabs, backspaces,
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* and UTF-8 */
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len++;
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}
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fclose(file);
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fflush(stdout);
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} while (*argv && *++argv);
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end:
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return 0;
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}
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