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/*
* Listener loop for subsystem library libss.a.
*
* $Header$
* $Locker$
*
* Copyright 1987, 1988 by MIT Student Information Processing Board
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose is hereby granted, provided that
* the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. M.I.T. and the
* M.I.T. S.I.P.B. make no representations about the suitability of
* this software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#include "config.h"
#include "ss_internal.h"
#include <stdio.h>
#include <setjmp.h>
#include <signal.h>
#include <sys/param.h>
typedef void sigret_t;
static ss_data *current_info;
static jmp_buf listen_jmpb;
static sigret_t (*sig_cont)(int);
static sigret_t print_prompt(int sig __SS_ATTR((unused)))
{
if (current_info->redisplay)
(*current_info->redisplay)();
else {
(void) fputs(current_info->prompt, stdout);
(void) fflush(stdout);
}
}
static sigret_t listen_int_handler(int sig __SS_ATTR((unused)))
{
putc('\n', stdout);
signal(SIGINT, listen_int_handler);
longjmp(listen_jmpb, 1);
}
int ss_listen (int sci_idx)
{
char *cp;
ss_data *info;
sigret_t (*sig_int)(int), (*old_sig_cont)(int);
char input[BUFSIZ];
sigset_t omask, igmask;
int code;
jmp_buf old_jmpb;
ss_data *old_info = current_info;
char *line;
current_info = info = ss_info(sci_idx);
sig_cont = (sigret_t (*)(int)) 0;
info->abort = 0;
sigemptyset(&igmask);
sigaddset(&igmask, SIGINT);
sigprocmask(SIG_BLOCK, &igmask, &omask);
memcpy(old_jmpb, listen_jmpb, sizeof(jmp_buf));
sig_int = signal(SIGINT, listen_int_handler);
setjmp(listen_jmpb);
sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0);
while(!info->abort) {
old_sig_cont = sig_cont;
sig_cont = signal(SIGCONT, print_prompt);
if (sig_cont == print_prompt)
sig_cont = old_sig_cont;
if (info->readline) {
line = (*info->readline)(current_info->prompt);
} else {
print_prompt(0);
if (fgets(input, BUFSIZ, stdin) == input)
line = input;
else
line = NULL;
input[BUFSIZ-1] = 0;
}
if (line == NULL) {
code = SS_ET_EOF;
(void) signal(SIGCONT, sig_cont);
goto egress;
}
cp = strchr(line, '\n');
if (cp) {
*cp = '\0';
if (cp == line)
continue;
}
(void) signal(SIGCONT, sig_cont);
if (info->add_history)
(*info->add_history)(line);
code = ss_execute_line (sci_idx, line);
if (code == SS_ET_COMMAND_NOT_FOUND) {
register char *c = line;
while (*c == ' ' || *c == '\t')
c++;
cp = strchr (c, ' ');
if (cp)
*cp = '\0';
cp = strchr (c, '\t');
if (cp)
*cp = '\0';
ss_error (sci_idx, 0,
"Unknown request \"%s\". Type \"?\" for a request list.",
c);
}
if (info->readline)
free(line);
}
code = 0;
egress:
(void) signal(SIGINT, sig_int);
memcpy(listen_jmpb, old_jmpb, sizeof(jmp_buf));
current_info = old_info;
return code;
}
void ss_abort_subsystem(int sci_idx, int code)
{
ss_info(sci_idx)->abort = 1;
ss_info(sci_idx)->exit_status = code;
}
void ss_quit(int argc __SS_ATTR((unused)),
const char * const *argv __SS_ATTR((unused)),
int sci_idx, pointer infop __SS_ATTR((unused)))
{
ss_abort_subsystem(sci_idx, 0);
}
#ifdef HAVE_DLOPEN
#define get_request(tbl,idx) ((tbl) -> requests + (idx))
static char *cmd_generator(const char *text, int state)
{
static int len;
static ss_request_table **rqtbl;
static int curr_rqt;
static char const * const * name;
ss_request_entry *request;
char *ret;
if (state == 0) {
len = strlen(text);
rqtbl = current_info->rqt_tables;
if (!rqtbl || !*rqtbl)
return 0;
curr_rqt = 0;
name = 0;
}
while (1) {
if (!name || !*name) {
request = get_request(*rqtbl, curr_rqt++);
name = request->command_names;
if (!name) {
rqtbl++;
if (*rqtbl) {
curr_rqt = 0;
continue;
} else
break;
}
}
if (strncmp(*name, text, len) == 0) {
ret = malloc(strlen(*name)+1);
if (ret)
strcpy(ret, *name);
name++;
return ret;
}
name++;
}
return 0;
}
char **ss_rl_completion(const char *text, int start,
int end __SS_ATTR((unused)))
{
if ((start == 0) && current_info->rl_completion_matches)
return (*current_info->rl_completion_matches)
(text, cmd_generator);
return 0;
}
#endif
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