mirror of
https://github.com/topjohnwu/ndk-busybox.git
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04095e58fb
This way, we can new get rid of all that tedious #define rubbish we used to need to enable specific messages. This way is enormously simpler, and as a bonus also ends up saving us 96 bytes. -Erik
218 lines
5.4 KiB
C
218 lines
5.4 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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*
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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 <stdio.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include "busybox.h"
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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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# include <termio.h>
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# define termios termio
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# define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
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# define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
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# else
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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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# endif
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static FILE *cin;
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static struct termios initial_settings, new_settings;
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static void gotsig(int sig)
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{
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setTermSettings(fileno(cin), &initial_settings);
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putchar('\n');
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exit(EXIT_FAILURE);
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}
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#endif /* BB_FEATURE_USE_TERMIOS */
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static int terminal_width = 79; /* not 80 in case terminal has linefold bug */
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static int terminal_height = 24;
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extern 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;
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struct stat st;
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FILE *file;
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int len, page_height;
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#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
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struct winsize win = { 0, 0, 0, 0 };
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#endif
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argc--;
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argv++;
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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 = xfopen(*argv, "r");
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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 = xfopen("/dev/console", "r");
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getTermSettings(fileno(cin), &initial_settings);
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new_settings = initial_settings;
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new_settings.c_cc[VMIN] = 1;
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new_settings.c_cc[VTIME] = 0;
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new_settings.c_lflag &= ~ICANON;
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new_settings.c_lflag &= ~ECHO;
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setTermSettings(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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len=0;
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lines = 0;
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page_height = terminal_height;
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please_display_more_prompt = 0;
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while ((c = getc(file)) != EOF) {
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if (please_display_more_prompt) {
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len = printf("--More-- ");
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if (file != stdin) {
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#if _FILE_OFFSET_BITS == 64
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len += printf("(%d%% of %lld bytes)",
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(int) (100 * ((double) ftell(file) /
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(double) st.st_size)), (long long)st.st_size);
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#else
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len += printf("(%d%% of %ld bytes)",
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(int) (100 * ((double) ftell(file) /
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(double) st.st_size)), (long)st.st_size);
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#endif
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}
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len += printf("%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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/*
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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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#ifdef BB_FEATURE_USE_TERMIOS
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input = getc(cin);
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#else
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input = getc(stdin);
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#endif
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#ifdef BB_FEATURE_USE_TERMIOS
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/* Erase the "More" message */
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putc('\r', stdout);
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while (--len >= 0)
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putc(' ', stdout);
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putc('\r', stdout);
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fflush(stdout);
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#endif
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len=0;
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lines = 0;
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page_height = terminal_height;
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please_display_more_prompt = 0;
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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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div_t result = div( len, terminal_width);
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if (result.quot) {
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if (result.rem)
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page_height-=result.quot;
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else
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page_height-=(result.quot-1);
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}
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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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len++;
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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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setTermSettings(fileno(cin), &initial_settings);
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#endif
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return 0;
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}
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