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/* vi: set sw=4 ts=4: */
/*
* Mini more implementation for busybox
*
*
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
*
* Latest version blended together by Erik Andersen <andersen@lineo.com>,
* based on the original more implementation by Bruce, and code from the
* Debian boot-floppies team.
*
* Termios corrects by Vladimir Oleynik <vodz@usa.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "busybox.h"
static FILE *cin;
#ifdef BB_FEATURE_USE_TERMIOS
#include <termios.h>
#define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
#define getTermSettings(fd,argp) tcgetattr(fd, argp);
static struct termios initial_settings, new_settings;
static void set_tty_to_initial_mode(void)
{
setTermSettings(fileno(cin), &initial_settings);
}
static void gotsig(int sig)
{
putchar('\n');
exit(EXIT_FAILURE);
}
#endif /* BB_FEATURE_USE_TERMIOS */
static int terminal_width = 79; /* not 80 in case terminal has linefold bug */
static int terminal_height = 24;
extern int more_main(int argc, char **argv)
{
int c, lines, input = 0;
int please_display_more_prompt = -1;
struct stat st;
FILE *file;
int len, page_height;
#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
struct winsize win = { 0, 0, 0, 0 };
#endif
argc--;
argv++;
/* not use inputing from terminal if usage: more > outfile */
if(isatty(fileno(stdout))) {
cin = fopen(CURRENT_TTY, "r");
if (!cin)
cin = xfopen(CONSOLE_DEV, "r");
please_display_more_prompt = 0;
#ifdef BB_FEATURE_USE_TERMIOS
getTermSettings(fileno(cin), &initial_settings);
new_settings = initial_settings;
new_settings.c_lflag &= ~ICANON;
new_settings.c_lflag &= ~ECHO;
#ifndef linux
/* Hmm, in linux c_cc[] not parsed if set ~ICANON */
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
#endif
setTermSettings(fileno(cin), &new_settings);
atexit(set_tty_to_initial_mode);
(void) signal(SIGINT, gotsig);
(void) signal(SIGQUIT, gotsig);
(void) signal(SIGTERM, gotsig);
#endif
}
do {
if (argc == 0) {
file = stdin;
} else
file = wfopen(*argv, "r");
if(file==0)
goto loop;
fstat(fileno(file), &st);
if(please_display_more_prompt>0)
please_display_more_prompt = 0;
#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
ioctl(fileno(stdout), TIOCGWINSZ, &win);
if (win.ws_row > 4)
terminal_height = win.ws_row - 2;
if (win.ws_col > 0)
terminal_width = win.ws_col - 1;
#endif
len=0;
lines = 0;
page_height = terminal_height;
while ((c = getc(file)) != EOF) {
if (please_display_more_prompt>0) {
len = printf("--More-- ");
if (file != stdin) {
#if _FILE_OFFSET_BITS == 64
len += printf("(%d%% of %lld bytes)",
(int) (100 * ((double) ftell(file) /
(double) st.st_size)), (long long)st.st_size);
#else
len += printf("(%d%% of %ld bytes)",
(int) (100 * ((double) ftell(file) /
(double) st.st_size)), (long)st.st_size);
#endif
}
fflush(stdout);
/*
* We've just displayed the "--More--" prompt, so now we need
* to get input from the user.
*/
input = getc(cin);
#ifndef BB_FEATURE_USE_TERMIOS
printf("\033[A"); /* up cursor */
#endif
/* Erase the "More" message */
putc('\r', stdout);
while (--len >= 0)
putc(' ', stdout);
putc('\r', stdout);
fflush(stdout);
len=0;
lines = 0;
page_height = terminal_height;
please_display_more_prompt = 0;
if (input == 'q')
goto end;
}
/*
* There are two input streams to worry about here:
*
* c : the character we are reading from the file being "mored"
* input : a character received from the keyboard
*
* 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.
*/
if (c == '\n') {
/* increment by just one line if we are at
* the end of this line */
if (input == '\n')
if(please_display_more_prompt==0)
please_display_more_prompt = 1;
/* Adjust the terminal height for any overlap, so that
* no lines get lost off the top. */
if (len >= terminal_width) {
int quot, rem;
quot = len / terminal_width;
rem = len - (quot * terminal_width);
if (quot) {
if (rem)
page_height-=quot;
else
page_height-=(quot-1);
}
}
if (++lines >= page_height) {
if(please_display_more_prompt==0)
please_display_more_prompt = 1;
}
len=0;
}
/*
* If we just read a newline from the file being 'mored' and any
* key other than a return is hit, scroll by one page
*/
putc(c, stdout);
len++;
}
fclose(file);
fflush(stdout);
loop:
argv++;
} while (--argc > 0);
end:
return 0;
}
|
