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195 lines
4.3 KiB
C
195 lines
4.3 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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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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*
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* Latest version blended together by Erik Andersen <andersen@lineo.com>,
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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static const char more_usage[] = "more [file ...]\n";
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/* ED: sparc termios is broken: revert back to old termio handling. */
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#ifdef BB_FEATURE_USE_TERMIOS
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#if #cpu(sparc)
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# define USE_OLD_TERMIO
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# include <termio.h>
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# define termios termio
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# define stty(fd,argp) ioctl(fd,TCSETAF,argp)
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#else
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# include <termios.h>
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# define stty(fd,argp) tcsetattr(fd,TCSANOW,argp)
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#endif
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FILE *cin;
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struct termios initial_settings, new_settings;
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void gotsig(int sig)
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{
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stty(fileno(cin), &initial_settings);
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fprintf(stdout, "\n");
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exit(TRUE);
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}
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#endif
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#define TERMINAL_WIDTH 79 /* not 80 in case terminal has linefold bug */
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#define TERMINAL_HEIGHT 24
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#if defined BB_FEATURE_AUTOWIDTH
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static int terminal_width = 0, terminal_height = 0;
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#else
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#define terminal_width TERMINAL_WIDTH
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#define terminal_height TERMINAL_HEIGHT
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#endif
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extern int more_main(int argc, char **argv)
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{
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int c, lines = 0, input = 0;
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int next_page = 0;
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struct stat st;
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FILE *file;
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#ifdef BB_FEATURE_AUTOWIDTH
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struct winsize win = { 0, 0 };
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#endif
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argc--;
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argv++;
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if (argc > 0
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&& (strcmp(*argv, "--help") == 0 || strcmp(*argv, "-h") == 0)) {
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usage(more_usage);
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}
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do {
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if (argc == 0) {
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file = stdin;
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} else
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file = fopen(*argv, "r");
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if (file == NULL) {
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perror(*argv);
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exit(FALSE);
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}
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fstat(fileno(file), &st);
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#ifdef BB_FEATURE_USE_TERMIOS
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cin = fopen("/dev/tty", "r");
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if (!cin)
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cin = fopen("/dev/console", "r");
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#ifdef USE_OLD_TERMIO
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ioctl(fileno(cin), TCGETA, &initial_settings);
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#else
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tcgetattr(fileno(cin), &initial_settings);
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#endif
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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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stty(fileno(cin), &new_settings);
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#ifdef BB_FEATURE_AUTOWIDTH
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ioctl(fileno(stdout), TIOCGWINSZ, &win);
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if (win.ws_row > 4)
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terminal_height = win.ws_row - 2;
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if (win.ws_col > 0)
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terminal_width = win.ws_col - 1;
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#endif
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(void) signal(SIGINT, gotsig);
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(void) signal(SIGQUIT, gotsig);
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(void) signal(SIGTERM, gotsig);
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#endif
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while ((c = getc(file)) != EOF) {
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if (next_page) {
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int len = 0;
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next_page = 0;
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lines = 0;
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len = fprintf(stdout, "--More-- ");
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if (file != stdin) {
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len += fprintf(stdout, "(%d%% of %ld bytes)",
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(int) (100 *
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((double) ftell(file) /
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(double) st.st_size)),
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st.st_size);
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}
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len += fprintf(stdout, "%s",
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#ifdef BB_FEATURE_USE_TERMIOS
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""
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#else
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"\n"
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#endif
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);
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fflush(stdout);
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input = getc(cin);
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#ifdef BB_FEATURE_USE_TERMIOS
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/* Erase the "More" message */
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while (--len >= 0)
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putc('\b', stdout);
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while (++len <= terminal_width)
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putc(' ', stdout);
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while (--len >= 0)
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putc('\b', stdout);
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fflush(stdout);
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#endif
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}
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if (c == '\n') {
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switch (input) {
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case 'q':
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goto end;
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case '\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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next_page = 1;
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break;
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}
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if (++lines == terminal_height)
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next_page = 1;
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}
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putc(c, stdout);
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}
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fclose(file);
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fflush(stdout);
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argv++;
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} while (--argc > 0);
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end:
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#ifdef BB_FEATURE_USE_TERMIOS
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gotsig(0);
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#endif
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exit(TRUE);
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}
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