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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.
*
* 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 "internal.h"
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#define BB_DECLARE_EXTERN
#define bb_need_help
#include "messages.c"
static const char more_usage[] = "more [FILE ...]\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nMore is a filter for viewing FILE one screenful at a time.\n"
#endif
;
/* ED: sparc termios is broken: revert back to old termio handling. */
#ifdef BB_FEATURE_USE_TERMIOS
#if #cpu(sparc)
# include <termio.h>
# define termios termio
# define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
# define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
#else
# include <termios.h>
# define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
# define getTermSettings(fd,argp) tcgetattr(fd, argp);
#endif
FILE *cin;
struct termios initial_settings, new_settings;
void gotsig(int sig)
{
setTermSettings(fileno(cin), &initial_settings);
fprintf(stdout, "\n");
exit(TRUE);
}
#endif
#define TERMINAL_WIDTH 79 /* not 80 in case terminal has linefold bug */
#define TERMINAL_HEIGHT 24
#if defined BB_FEATURE_AUTOWIDTH
#ifdef BB_FEATURE_USE_TERMIOS
static int terminal_width = TERMINAL_WIDTH;
#endif
static int terminal_height = TERMINAL_HEIGHT;
#else
#define terminal_width TERMINAL_WIDTH
#define terminal_height TERMINAL_HEIGHT
#endif
extern int more_main(int argc, char **argv)
{
int c, lines = 0, input = 0;
int please_display_more_prompt = 0;
struct stat st;
FILE *file;
#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
struct winsize win = { 0, 0 };
#endif
argc--;
argv++;
if (argc > 0
&& (strcmp(*argv, dash_dash_help) == 0 || strcmp(*argv, "-h") == 0)) {
usage(more_usage);
}
do {
if (argc == 0) {
file = stdin;
} else
file = fopen(*argv, "r");
if (file == NULL) {
perror(*argv);
exit(FALSE);
}
fstat(fileno(file), &st);
#ifdef BB_FEATURE_USE_TERMIOS
cin = fopen("/dev/tty", "r");
if (!cin)
cin = fopen("/dev/console", "r");
getTermSettings(fileno(cin), &initial_settings);
new_settings = initial_settings;
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
new_settings.c_lflag &= ~ICANON;
new_settings.c_lflag &= ~ECHO;
setTermSettings(fileno(cin), &new_settings);
#ifdef BB_FEATURE_AUTOWIDTH
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
(void) signal(SIGINT, gotsig);
(void) signal(SIGQUIT, gotsig);
(void) signal(SIGTERM, gotsig);
#endif
while ((c = getc(file)) != EOF) {
if (please_display_more_prompt) {
int len = 0;
please_display_more_prompt = 0;
lines = 0;
len = fprintf(stdout, "--More-- ");
if (file != stdin) {
len += fprintf(stdout, "(%d%% of %ld bytes)",
(int) (100 *
((double) ftell(file) /
(double) st.st_size)),
st.st_size);
}
len += fprintf(stdout, "%s",
#ifdef BB_FEATURE_USE_TERMIOS
""
#else
"\n"
#endif
);
fflush(stdout);
/*
* We've just displayed the "--More--" prompt, so now we need
* to get input from the user.
*/
#ifdef BB_FEATURE_USE_TERMIOS
input = getc(cin);
#else
input = getc(stdin);
#endif
#ifdef BB_FEATURE_USE_TERMIOS
/* Erase the "More" message */
while (--len >= 0)
putc('\b', stdout);
while (++len <= terminal_width)
putc(' ', stdout);
while (--len >= 0)
putc('\b', stdout);
fflush(stdout);
#endif
}
/*
* 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') {
switch (input) {
case 'q':
goto end;
case '\n':
/* increment by just one line if we are at
* the end of this line*/
please_display_more_prompt = 1;
break;
}
if (++lines == terminal_height)
please_display_more_prompt = 1;
}
/* If any key other than a return is hit, scroll by one page */
putc(c, stdout);
}
fclose(file);
fflush(stdout);
argv++;
} while (--argc > 0);
end:
#ifdef BB_FEATURE_USE_TERMIOS
gotsig(0);
#endif
return(TRUE);
}
|
