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/*
* Listener loop for subsystem library libss.a.
*
* Header: /afs/rel-eng.athena.mit.edu/project/release/current/source/athena/athena.lib/ss/RCS/listen.c,v 1.2 90/07/12 12:28:58 epeisach Exp
* $Locker: $
*
* Copyright 1987, 1988 by MIT Student Information Processing Board
*
* For copyright information, see copyright.h.
*/
#include "copyright.h"
#include "ss_internal.h"
#include <stdio.h>
#include <setjmp.h>
#include <signal.h>
#include <sys/param.h>
#if defined(BSD) && !defined(POSIX)
#include <sgtty.h>
#endif
#ifdef POSIX
#include <termios.h>
#endif
#ifndef lint
static char const rcs_id[] =
"Header: /afs/rel-eng.athena.mit.edu/project/release/current/source/athena/athena.lib/ss/RCS/listen.c,v 1.2 90/07/12 12:28:58 epeisach Exp ";
#endif
#ifdef POSIX
#define sigtype void
#else
#define sigtype int
#endif POSIX
extern char *index();
static ss_data *current_info;
static jmp_buf listen_jmpb;
static sigtype print_prompt()
{
/* put input into a reasonable mode */
#if defined(BSD) && !defined(POSIX)
struct sgttyb ttyb;
if (ioctl(fileno(stdin), TIOCGETP, &ttyb) != -1) {
if (ttyb.sg_flags & (CBREAK|RAW)) {
ttyb.sg_flags &= ~(CBREAK|RAW);
(void) ioctl(0, TIOCSETP, &ttyb);
}
#endif
#ifdef POSIX
struct termios tio;
if (tcgetattr(fileno(stdin), &tio) != -1) {
tio.c_oflag |= (OPOST|ONLCR);
tio.c_iflag &= ~(IGNCR|INLCR);
tio.c_iflag |= (ICRNL);
tio.c_lflag |= (ICANON);
(void) tcsetattr(0, TCSADRAIN, &tio);
}
#endif
(void) fputs(current_info->prompt, stdout);
(void) fflush(stdout);
}
static sigtype listen_int_handler()
{
putc('\n', stdout);
longjmp(listen_jmpb, 1);
}
int ss_listen (sci_idx)
int sci_idx;
{
register char *cp;
register sigtype (*sig_cont)();
register ss_data *info;
sigtype (*sig_int)(), (*old_sig_cont)();
char input[BUFSIZ];
char buffer[BUFSIZ];
char *end = buffer;
int mask;
int code;
jmp_buf old_jmpb;
ss_data *old_info = current_info;
static sigtype print_prompt();
current_info = info = ss_info(sci_idx);
sig_cont = (sigtype (*)())0;
info->abort = 0;
mask = sigblock(sigmask(SIGINT));
bcopy(listen_jmpb, old_jmpb, sizeof(jmp_buf));
sig_int = signal(SIGINT, listen_int_handler);
setjmp(listen_jmpb);
(void) sigsetmask(mask);
while(!info->abort) {
print_prompt();
*end = '\0';
old_sig_cont = sig_cont;
sig_cont = signal(SIGCONT, print_prompt);
#ifdef mips
/* The mips compiler breaks on determining the types,
we help */
if ( (sigtype *) sig_cont == (sigtype *) print_prompt)
#else
if ( sig_cont == print_prompt)
#endif
sig_cont = old_sig_cont;
if (fgets(input, BUFSIZ, stdin) != input) {
code = SS_ET_EOF;
goto egress;
}
cp = index(input, '\n');
if (cp) {
*cp = '\0';
if (cp == input)
continue;
}
(void) signal(SIGCONT, sig_cont);
for (end = input; *end; end++)
;
code = ss_execute_line (sci_idx, input);
if (code == SS_ET_COMMAND_NOT_FOUND) {
register char *c = input;
while (*c == ' ' || *c == '\t')
c++;
cp = index (c, ' ');
if (cp)
*cp = '\0';
cp = index (c, '\t');
if (cp)
*cp = '\0';
ss_error (sci_idx, 0,
"Unknown request \"%s\". Type \"?\" for a request list.",
c);
}
}
code = 0;
egress:
(void) signal(SIGINT, sig_int);
bcopy(old_jmpb, listen_jmpb, sizeof(jmp_buf));
current_info = old_info;
return code;
}
void ss_abort_subsystem(sci_idx, code)
int sci_idx, code;
{
ss_info(sci_idx)->abort = 1;
ss_info(sci_idx)->exit_status = code;
}
void ss_quit(argc, argv, sci_idx, infop)
int argc;
char **argv;
int sci_idx;
pointer infop;
{
ss_abort_subsystem(sci_idx, 0);
}
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