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/*
* Test program to try to query device id from printer.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#define IOCNR_GET_DEVICE_ID 1
#define LPIOC_GET_DEVICE_ID(len) \
_IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len) // get device_id string
#define LPGETSTATUS 0x060b // drivers/char/lp.c
int
error(int fatal, char *fmt, ...)
{
va_list ap;
fprintf(stderr, fatal ? "Error: " : "Warning: ");
if (errno)
fprintf(stderr, "%s: ", strerror(errno));
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fatal > 0)
exit(fatal);
else
{
errno = 0;
return (fatal);
}
}
int
main (int argc, char *argv[])
{
int fd;
unsigned char argp[1024];
int length;
--argc;
++argv;
if (argc != 1)
error(1, "usage: usb_printerid /dev/usb/lp0\n");
fd = open(argv[0], O_RDWR);
if (fd < 0)
error(1, "can't open '%s'\n", argv[0]);
if (ioctl(fd, LPIOC_GET_DEVICE_ID(sizeof(argp)), argp) < 0)
error(1, "GET_DEVICE_ID on '%s'\n", argv[0]);
length = (argp[0] << 8) + argp[1] - 2;
printf("GET_DEVICE_ID string:\n");
fwrite(argp + 2, 1, length, stdout);
printf("\n");
#if 0
if (ioctl(fd, LPGETSTATUS, &status) < 0)
error(1, "LPGETSTATUS on '%s'\n", argv[0]);
printf("Status: 0x%02x\n", status);
#endif
close(fd);
exit(0);
}
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