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/* vttest.c -- written by Charles Howes (chowes@sfu.ca) */
/* Modified to (hopefully) be more portable, run as a function,
and test only for vt100 terminal emulation on 9/30/93
This function will return 1 if the tty is vt100 or 0 if an error
occurred or the terminal doesn't appear to be a vt100 terminal.
Completely re-written 10/9/93 for better portability
-Sam Lantinga (slouken@toadflax.cs.ucdavis.edu)
*/
#include <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
#ifdef HAVE_TERMIO_H
#include <termio.h>
#else
#include <setjmp.h>
#include <signal.h>
#include <sys/ioctl.h>
#define termio sgttyb
#define TCGETA TIOCGETP
#define TCSETAW TIOCSETP
#endif /* HAVE_TERMIO_H */
#ifdef NEED_COMPAT_H
#include <sys/ioctl_compat.h>
#endif /* NEED_COMPAT_H */
#ifdef HAVE_BSDTTY_H
#include <sys/bsdtty.h>
#endif /* HAVE_BSDTTY_H */
#ifdef MAIN
int main() { if ( vttest() ) printf("vt100\n"); }
#endif
/* Register that we are alarmed. (called by SIG_ALRM on BSD) */
static int alarmed;
#ifndef HAVE_TERMIO_H
static jmp_buf alarm_buf;
static void alrm_trap() { alarmed=1; longjmp(alarm_buf, 1); }
#endif /* No termio.h */
int vttest()
{
char buff[512];
int x=0, w, rc=0, fd;
struct termio ttold, ttraw;
/* Set the terminal in a raw mode */
if ( (fd=open("/dev/tty", O_RDWR, 0666)) < 0 )
return(0);
if ( ioctl(fd, TCGETA, (char *)&ttold) < 0 )
return(0);
(void) ioctl(fd, TCGETA, (char *)&ttraw);
#ifdef HAVE_TERMIO_H
#ifdef SEVEN_BIT
ttraw.c_iflag=(IGNBRK | ISTRIP); /* turn off all input control */
#else
ttraw.c_iflag=(IGNBRK); /* turn off all input control */
#endif /* SEVEN_BIT */
ttraw.c_oflag &= ~(OLCUC | ONLCR | OCRNL | ONLRET);
/* disable output post-processing */
ttraw.c_lflag = 0;
ttraw.c_cc[VMIN]=0; /* 1 or more chars satisfy read */
ttraw.c_cc[VTIME]=10; /* 10'ths of seconds between chars */
#else
ttraw.sg_flags |= RAW; /* turn RAW mode on */
ttraw.sg_flags &= ~ECHO; /* turn ECHO off */
#endif /* HAVE_TERMIO_H */
if (ioctl(fd, TCSETAW, (char *)&ttraw) < 0)
return(0);
write(fd,"\033[c", 3); /* Vt100 test: ESC [ c */
#ifndef HAVE_TERMIO_H /* We need to set an alarm */
signal(SIGALRM, alrm_trap);
alarmed=0;
alarm(1);
setjmp(alarm_buf);
#endif
while ( !alarmed && (x < 20) ) {
if ( read(fd, &buff[x++], 1) <= 0 )
break;
}
buff[x]='\0'; /* For printing, if we desire. */
if ( buff[0] == '\033' ) /* An escape sequence? :) */
rc=1;
#ifndef HAVE_TERMIO_H
alarm(0);
signal(SIGALRM, SIG_DFL);
#endif
(void) ioctl(fd, TCSETAW, (char *)&ttold);
(void) close(fd);
#ifdef not_defined /* Print out the response for debugging */
for ( w=0; buff[w]; ++w )
if ( buff[w] < ' ' )
printf("^%c", buff[w]+'@');
else
printf("%c", buff[w]);
printf("\n");
#endif /* not_defined */
return rc;
}
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