mirror of
https://github.com/koenkooi/foo2zjs.git
synced 2026-01-22 03:34:49 +08:00
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/*
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* Test program to try to query device id from printer.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#define IOCNR_GET_DEVICE_ID 1
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#define LPIOC_GET_DEVICE_ID(len) \
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_IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len) // get device_id string
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#define LPGETSTATUS 0x060b // drivers/char/lp.c
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int
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error(int fatal, char *fmt, ...)
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{
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va_list ap;
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fprintf(stderr, fatal ? "Error: " : "Warning: ");
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if (errno)
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fprintf(stderr, "%s: ", strerror(errno));
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (fatal > 0)
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exit(fatal);
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else
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{
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errno = 0;
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return (fatal);
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}
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}
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int
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main (int argc, char *argv[])
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{
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int fd;
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unsigned char argp[1024];
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int length;
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--argc;
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++argv;
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if (argc != 1)
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error(1, "usage: usb_printerid /dev/usb/lp0\n");
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fd = open(argv[0], O_RDWR);
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if (fd < 0)
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error(1, "can't open '%s'\n", argv[0]);
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if (ioctl(fd, LPIOC_GET_DEVICE_ID(sizeof(argp)), argp) < 0)
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error(1, "GET_DEVICE_ID on '%s'\n", argv[0]);
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length = (argp[0] << 8) + argp[1] - 2;
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printf("GET_DEVICE_ID string:\n");
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fwrite(argp + 2, 1, length, stdout);
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printf("\n");
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#if 0
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if (ioctl(fd, LPGETSTATUS, &status) < 0)
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error(1, "LPGETSTATUS on '%s'\n", argv[0]);
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printf("Status: 0x%02x\n", status);
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#endif
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close(fd);
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exit(0);
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}
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