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/***************************************************************************
** File: mux.c
** Description: the main program loop
**
** Copyright (C)1999 Anca and Lucian Jurubita <ljurubita@hotmail.com>.
** All rights reserved.
****************************************************************************
** 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 at www.gnu.org
****************************************************************************
** Rev. 1.0 - Feb. 2000
****************************************************************************/
#include "config.h"
#include "microcom.h"
#include <stdbool.h>
#define BUFSIZE 1024
static int logfd = -1;
char *answerback;
static void write_receive_buf(const unsigned char *buf, int len)
{
if (!len)
return;
write(STDOUT_FILENO, buf, len);
if (logfd >= 0)
write(logfd, buf, len);
}
static int handle_receive_buf(struct ios_ops *ios, unsigned char *buf, int len)
{
unsigned char *sendbuf = buf;
while (len) {
switch (*buf) {
case 5:
write_receive_buf(sendbuf, buf - sendbuf);
if (answerback)
ios->write(ios, answerback, strlen(answerback));
else
write_receive_buf(buf, 1);
buf += 1;
len -= 1;
sendbuf = buf;
break;
default:
buf += 1;
len -= 1;
break;
}
}
write_receive_buf(sendbuf, buf - sendbuf);
return 0;
}
/* handle escape characters, writing to output */
static void cook_buf(struct ios_ops *ios, unsigned char *buf, int num)
{
int current = 0;
while (current < num) { /* big while loop, to process all the charactes in buffer */
/* look for the next escape character (Ctrl-\) */
while ((current < num) && (buf[current] != 28))
current++;
/* and write the sequence before esc char to the comm port */
if (current)
ios->write(ios, buf, current);
if (current < num) { /* process an escape sequence */
/* found an escape character */
do_commandline();
return;
} /* if - end of processing escape sequence */
num -= current;
buf += current;
current = 0;
} /* while - end of processing all the charactes in the buffer */
}
void logfile_close(void)
{
if (logfd >= 0)
close(logfd);
logfd = -1;
}
int logfile_open(const char *path)
{
int fd;
fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0644);
if (fd < 0) {
fprintf(stderr, "Cannot open logfile '%s': %s\n", path, strerror(errno));
return fd;
}
if (logfd >= 0)
logfile_close();
logfd = fd;
return 0;
}
/* main program loop */
int mux_loop(struct ios_ops *ios)
{
fd_set ready; /* used for select */
int i = 0, len; /* used in the multiplex loop */
unsigned char buf[BUFSIZE];
while (1) {
int ret;
FD_ZERO(&ready);
if (!listenonly)
FD_SET(STDIN_FILENO, &ready);
FD_SET(ios->fd, &ready);
select(ios->fd + 1, &ready, NULL, NULL, NULL);
if (FD_ISSET(ios->fd, &ready)) {
/* pf has characters for us */
len = ios->read(ios, buf, BUFSIZE);
if (len < 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
ret = -errno;
fprintf(stderr, "%s\n", strerror(-ret));
return ret;
}
} else if (len == 0) {
fprintf(stderr, "Got EOF from port\n");
return -EINVAL;
} else {
i = handle_receive_buf(ios, buf, len);
if (i < 0) {
fprintf(stderr, "%s\n", strerror(-i));
return i;
}
}
}
if (!listenonly && FD_ISSET(STDIN_FILENO, &ready)) {
/* standard input has characters for us */
i = read(STDIN_FILENO, buf, BUFSIZE);
if (i < 0) {
ret = -errno;
fprintf(stderr, "%s\n", strerror(-ret));
return ret;
}
if (i == 0) {
fprintf(stderr, "Got EOF from stdin\n");
return -EINVAL;
}
cook_buf(ios, buf, i);
}
}
}
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