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/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <termios.h>
#include <unistd.h>
static void writeAll(int fd, const uint8_t *ptr, size_t size) {
while (size) {
ssize_t ret = write(fd, ptr, size);
if (ret < 0) err(EX_IOERR, "write");
ptr += ret;
size -= ret;
}
}
static void readAll(int fd, uint8_t *ptr, size_t size) {
while (size) {
ssize_t ret = read(fd, ptr, size);
if (ret < 0) err(EX_IOERR, "read");
if (!ret) errx(EX_DATAERR, "unexpected eof");
ptr += ret;
size -= ret;
}
}
static void req2(int fd, uint8_t c) {
uint8_t buf[] = { 0x1B, c };
writeAll(fd, buf, 2);
}
static uint8_t res2(int fd) {
uint8_t buf[2];
readAll(fd, buf, 2);
if (buf[0] != 0x1B) errx(EX_PROTOCOL, "response fail %hhX", buf[0]);
return buf[1];
}
static void req3(int fd, uint8_t c, uint8_t d) {
uint8_t buf[] = { 0x1B, c, d };
writeAll(fd, buf, 3);
}
static struct Res3 { uint8_t c, d; } res3(int fd) {
uint8_t buf[3];
readAll(fd, buf, 3);
if (buf[0] != 0x1B) errx(EX_PROTOCOL, "response fail %hhX", buf[0]);
return (struct Res3) { buf[1], buf[2] };
}
static void reset(int tty) {
req2(tty, 'a');
}
static void test(int tty) {
uint8_t res;
req2(tty, 'e');
res = res2(tty);
if (res != 'y') errx(EX_PROTOCOL, "test fail %hhX", res);
req2(tty, 0x87);
res = res2(tty);
if (res != '0') errx(EX_PROTOCOL, "ram fail %hhX", res);
req2(tty, 't');
struct Res3 model = res3(tty);
printf("model: %c%c\n", model.c, model.d);
req2(tty, 'v');
res = res2(tty);
printf("firmware: %hhu\n", res);
}
static void sensorTest(int tty) {
req2(tty, 0x86);
uint8_t res = res2(tty);
if (res != '0') errx(EX_PROTOCOL, "sensor fail %hhX", res);
}
static void led(int tty, char c) {
switch (c) {
break; case 'a': req2(tty, 0x82);
break; case 'g': req2(tty, 0x83);
break; case 'y': req2(tty, 0x84);
break; case 'r': req2(tty, 0x85);
break; default: req2(tty, 0x81);
}
}
static void status(int tty) {
uint8_t res = res2(tty);
switch (res) {
break; case '0': return;
break; case '1': errx(EX_DATAERR, "read/write error");
break; case '2': errx(EX_DATAERR, "command format error");
break; case '4': errx(EX_DATAERR, "invalid command");
break; case '9': errx(EX_DATAERR, "invalid card swipe");
break; default: errx(EX_PROTOCOL, "status fail %hhX", res);
}
}
static void readCard(int tty) {
req2(tty, 'r');
uint8_t res = res2(tty);
if (res != 's') errx(EX_PROTOCOL, "read fail %hhX", res);
for (;;) {
readAll(tty, &res, 1);
if (res == '?') {
readAll(tty, &res, 1);
if (res == 0x1C) break;
printf("?");
} else {
printf("%c", res);
}
}
status(tty);
}
static void writeCard(int tty) {
req2(tty, 'w');
req2(tty, 's');
uint8_t buf[2];
ssize_t size;
while (0 < (size = read(STDIN_FILENO, buf, 2))) {
writeAll(tty, buf, 2);
}
if (size < 0) err(EX_IOERR, "(stdin)");
buf[0] = '?';
buf[1] = 0x1C;
writeAll(tty, buf, 2);
status(tty);
}
static void eraseCard(int tty, char c) {
req3(tty, 'c', c - '0');
uint8_t res = res2(tty);
if (res != '0') errx(EX_PROTOCOL, "erase fail %hhX", res);
}
static void setHiCo(int tty) {
req2(tty, 'x');
uint8_t res = res2(tty);
if (res != '0') errx(EX_PROTOCOL, "hi-co fail %hhX", res);
}
static void setLoCo(int tty) {
req2(tty, 'y');
uint8_t res = res2(tty);
if (res != '0') errx(EX_PROTOCOL, "lo-co fail %hhX", res);
}
static void getCo(int tty) {
req2(tty, 'd');
uint8_t res = res2(tty);
switch (res) {
break; case 'h': printf("hi-co\n");
break; case 'l': printf("lo-co\n");
break; default: errx(EX_PROTOCOL, "get co fail %hhX", res);
}
}
int main(int argc, char *argv[]) {
const char *file = "/dev/ttyUSB0";
char func = 't';
const char *arg = NULL;
int opt;
while (0 < (opt = getopt(argc, argv, "L:RTce:f:hlrtw"))) {
switch (opt) {
break; case 'f': file = optarg;
break; case '?': return EX_USAGE;
break; default: func = opt; arg = optarg;
}
}
int tty = open(file, O_RDWR);
if (tty < 0) err(EX_NOINPUT, "%s", file);
struct termios attr;
int error = tcgetattr(tty, &attr);
if (error) err(EX_IOERR, "tcgetattr");
cfmakeraw(&attr);
error = tcsetattr(tty, TCSANOW, &attr);
if (error) err(EX_IOERR, "tcsetattr");
switch (func) {
break; case 'L': led(tty, arg[0]);
break; case 'R': reset(tty);
break; case 'T': sensorTest(tty);
break; case 'c': getCo(tty);
break; case 'e': eraseCard(tty, arg[0]);
break; case 'h': setHiCo(tty);
break; case 'l': setLoCo(tty);
break; case 'r': readCard(tty);
break; case 't': test(tty);
break; case 'w': writeCard(tty);
break; default: return EX_USAGE;
}
}
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