hush/more.c

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C
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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>.
*
* 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.
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*
* 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
*
*/
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#include "internal.h"
#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
# include <termio.h>
# define termios termio
# define stty(fd,argp) ioctl(fd,TCSETAF,argp)
#else
# include <termios.h>
# define stty(fd,argp) tcsetattr(fd,TCSANOW,argp)
#endif
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FILE *cin;
struct termios initial_settings, new_settings;
void gotsig(int sig) {
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stty(fileno(cin), &initial_settings);
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fprintf(stdout, "\n");
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exit( TRUE);
}
#endif
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#define TERMINAL_WIDTH 79 /* not 80 in case terminal has linefold bug */
#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;
#else
#define terminal_width TERMINAL_WIDTH
#define terminal_height TERMINAL_HEIGHT
#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--;
argv++;
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if ( argc > 0 && (strcmp(*argv,"--help")==0 || strcmp(*argv,"-h")==0) ) {
usage (more_usage);
}
do {
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if (argc==0) {
file = stdin;
}
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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}
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)
cin = fopen("/dev/console", "r");
#ifdef USE_OLD_TERMIO
ioctl(fileno(cin),TCGETA,&initial_settings);
#else
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tcgetattr(fileno(cin),&initial_settings);
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#endif
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new_settings = initial_settings;
new_settings.c_lflag &= ~ICANON;
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)
terminal_height = win.ws_row - 2;
if (win.ws_col > 0)
terminal_width = win.ws_col - 1;
#endif
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(void) signal(SIGINT, gotsig);
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(void) signal(SIGQUIT, gotsig);
(void) signal(SIGTERM, gotsig);
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#endif
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while ((c = getc(file)) != EOF) {
if ( next_page ) {
int len=0;
next_page = 0;
lines=0;
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len = fprintf(stdout, "--More-- ");
if (file != stdin) {
len += fprintf(stdout, "(%d%% of %ld bytes)",
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(int) (100*( (double) ftell(file) / (double) st.st_size )),
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st.st_size);
}
len += fprintf(stdout, "%s",
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#ifdef BB_FEATURE_USE_TERMIOS
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""
#else
"\n"
#endif
);
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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);
fflush(stdout);
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#endif
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}
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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*/
next_page = 1;
break;
}
if ( ++lines == terminal_height )
next_page = 1;
}
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putc(c, stdout);
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}
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fclose(file);
fflush(stdout);
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);
#endif
exit(TRUE);
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}
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