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/*
* follow.c -- interactively print an ASCII file.
*
* 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.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#ifndef USE_SGTTY
# ifdef APOLLO
# include "/sys5.3/usr/include/sys/termio.h"
# else
/*
* including both termio.h and termios.h might be an overkill, and gives
* many warnings, but seems to be necessary at times. works anyway.
*/
# include <termios.h>
# include <termio.h>
# endif
/* #else USE_SGTTY */
#endif
/*
* SunOS 4 doesn't have function headers and has the defs needed from
* ioctl.h in termios.h. Does it compile with USE_SGTTY?
*/
#if (defined(sun) && defined(sparc) && ! defined(__SVR4))
extern int printf();
#else
# include <sys/ioctl.h>
#endif
#ifdef BSD_LIKE
# include <sys/ioctl_compat.h>
# define O_RAW RAW
# define O_ECHO ECHO
# define O_CBREAK CBREAK
#endif
#if defined(TCSETS) || defined(TCSETATTR)
# ifndef TCSETS /* cc for HP-UX SHOULD define this... */
# define TCSETS TCSETATTR
# define TCGETS TCGETATTR
# endif
typedef struct termios termiostruct;
#else
# define TCSETS TCSETA
# define TCGETS TCGETA
typedef struct termio termiostruct;
#endif
#ifdef VSUSP
# define O_SUSP VSUSP
#else
# ifdef SWTCH
# define O_SUSP SWTCH
# else
# define O_SUSP SUSP
# endif
#endif
/*int ioctl();*/
#ifdef USE_SGTTY
static struct sgttyb ttybsave;
static struct tchars tcsave;
static struct ltchars ltcsave;
#else /* not USE_SGTTY */
static termiostruct ttybsave;
#endif /* USE_SGTTY */
/*
* Terminal handling routines:
* These are one big mess of left-justified chicken scratches.
* It should be handled more cleanly...but unix portability is what it is.
*/
/*
* Set the terminal to character-at-a-time-without-echo mode, and save the
* original state in ttybsave
*/
void set_terminal()
{
#ifdef USE_SGTTY
struct sgttyb ttyb;
struct ltchars ltc;
ioctl(0, TIOCGETP, &ttybsave);
ioctl(0, TIOCGETC, &tcsave);
ioctl(0, TIOCGLTC, <csave);
ttyb = ttybsave;
ttyb.sg_flags = (ttyb.sg_flags|O_CBREAK) & ~O_ECHO;
ioctl(0, TIOCSETP, &ttyb);
ltc = ltcsave;
ltc.t_suspc = -1;
ioctl(0, TIOCSLTC, <c);
#else /* not USE_SGTTY */
termiostruct ttyb;
ioctl(0, TCGETS, &ttyb);
ttybsave = ttyb;
ttyb.c_lflag &= ~(ECHO|ICANON);
ttyb.c_cc[VTIME] = 0;
ttyb.c_cc[VMIN] = 1;
/* disable the special handling of the suspend key (handle it ourselves) */
ttyb.c_cc[O_SUSP] = 0;
ioctl(0, TCSETS, &ttyb);
#endif /* USE_SGTTY */
}
/*
* Reset the terminal to its original state
*/
void reset_terminal()
{
#ifdef USE_SGTTY
ioctl(0, TIOCSETP, &ttybsave);
ioctl(0, TIOCSETC, &tcsave);
ioctl(0, TIOCSLTC, <csave);
#else /* not USE_SGTTY */
ioctl(0, TCSETS, &ttybsave);
#endif /* USE_SGTTY */
}
int main(int argc, char *argv[]) {
FILE *f;
char c = 0, buf[512];
int d;
if (argc < 2) {
fprintf(stderr, "needed a file name\n");
exit(0);
}
f = fopen(argv[1], "r");
if (!f) {
fprintf(stderr, "unable to open %s\n", argv[1]);
exit(0);
}
set_terminal();
while(c!=0x1b) {
read(0, &c, 1);
if (c == 0x0a || c == 0x0d) {
if (fgets(buf, 512, f))
fputs(buf, stdout);
else
break;
}
else {
if ((d = fgetc(f)) != EOF)
putchar(d);
else
break;
}
fflush(stdout);
}
reset_terminal();
fputs("\033[0m\n", stdout);
return 0;
}
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