busybox/util-linux/more.c

159 lines
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C
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/*
* Mini more implementation for busybox
*
* Copyright (C) 1998 by Erik Andersen <andersee@debian.org>
*
* 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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/* Turning this off makes things a bit smaller (and less pretty) */
#define BB_MORE_TERM
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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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static const char more_usage[] = "[file ...]";
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/* ED: sparc termios is broken: revert back to old termio handling. */
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#ifdef BB_MORE_TERM
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#if defined (__sparc__)
# define USE_OLD_TERMIO
# include <termio.h>
# include <sys/ioctl.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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exit( TRUE);
}
#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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if ( strcmp(*argv,"--help")==0 || strcmp(*argv,"-h")==0 ) {
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usage (more_usage);
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}
argc--;
argv++;
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while (argc >= 0) {
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("Can't open file");
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exit(FALSE);
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}
fstat(fileno(file), &st);
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#ifdef BB_MORE_TERM
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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(void) signal(SIGINT, gotsig);
#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_MORE_TERM
""
#else
"\n"
#endif
);
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fflush(stdout);
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input = getc( cin);
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#ifdef BB_MORE_TERM
/* Erase the "More" message */
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while(len-- > 0)
putc('\b', stdout);
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while(len++ < 79)
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putc(' ', stdout);
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while(len-- > 0)
putc('\b', stdout);
fflush(stdout);
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#endif
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}
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if (input=='q')
goto end;
if (input==' ' && c == '\n' )
next_page = 1;
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if ( c == '\n' && ++lines == 24 )
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next_page = 1;
putc(c, stdout);
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}
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fclose(file);
fflush(stdout);
argc--;
argv++;
}
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end:
#ifdef BB_MORE_TERM
gotsig(0);
#endif
exit(TRUE);
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}
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