toaruos/apps/serial-console.c

149 lines
2.9 KiB
C

/**
* @brief serial console
*
* Old tool for poking serial ports. Probably doesn't work right
* anymore since serial ports are now behind PTYs.
*
* @copyright
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2013-2014 K. Lange
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/fswait.h>
int fd = 0;
int keep_echo = 0;
int dos_lines = 0;
int keep_canon = 0;
struct termios old;
void set_unbuffered() {
tcgetattr(fileno(stdin), &old);
struct termios new = old;
if (!keep_canon) {
new.c_lflag &= (~ICANON);
}
if (!keep_echo) {
new.c_lflag &= (~ECHO);
}
tcsetattr(fileno(stdin), TCSAFLUSH, &new);
}
void set_buffered() {
tcsetattr(fileno(stdin), TCSAFLUSH, &old);
}
int show_usage(int argc, char * argv[]) {
printf(
"Serial client.\n"
"\n"
"usage: %s [-e] [-r] [-c] [device path]\n"
"\n"
" -e \033[3mkeep echo enabled\033[0m\n"
" -c \033[3mkeep canon enabled\033[0m\n"
" -r \033[3mtransform line feeds to \\r\\n\033[0m\n"
" -? \033[3mshow this help text\033[0m\n"
"\n", argv[0]);
return 1;
}
int main(int argc, char ** argv) {
int arg = 1;
char * device;
while (arg < argc) {
if (argv[arg][0] != '-') break;
if (!strcmp(argv[arg], "-e")) {
keep_echo = 1;
} else if (!strcmp(argv[arg], "-r")) {
dos_lines = 1;
} else if (!strcmp(argv[arg], "-c")) {
keep_canon = 1;
} else if (!strcmp(argv[arg], "-?")) {
return show_usage(argc, argv);
} else {
fprintf(stderr, "%s: Unrecognized option: %s\n", argv[0], argv[arg]);
}
arg++;
}
if (arg == argc) {
device = "/dev/ttyS0";
} else {
device = argv[arg];
}
set_unbuffered();
fd = open(device, 0, 0);
int fds[2] = {STDIN_FILENO, fd};
while (1) {
int index = fswait(2, fds);
if (index == -1) {
fprintf(stderr, "serial-console: fswait: erroneous file descriptor\n");
fprintf(stderr, "serial-console: (did you try to open a file that isn't a serial console?\n");
return 1;
}
if (index == 0) {
char c = fgetc(stdin);
if (c == 0x1D) { /* ^] */
while (1) {
printf("serial-console> ");
set_buffered();
fflush(stdout);
char line[1024];
fgets(line, 1024, stdin);
if (feof(stdin)) {
return 0;
}
int i = strlen(line);
line[i-1] = '\0';
if (!strcmp(line, "quit")) {
return 0;
} else if (!strcmp(line, "continue")) {
set_unbuffered();
fflush(stdout);
break;
}
}
} else {
if (dos_lines && c == '\n') {
char buf[1] = {'\r'};
write(fd, buf, 1);
}
char buf[1] = {c};
write(fd, buf, 1);
}
} else {
char buf[1024];
size_t r = read(fd, buf, 1024);
fwrite(buf, 1, r, stdout);
fflush(stdout);
}
}
close(fd);
set_buffered();
return 0;
}