sibo-playground/code/inventory/scan.c

/*
 * scan.c - Phase 1 barcode diagnostic for the Workabout MX integral laser.
 *
 * Loads the EAN/UPC decoder LDD (BAREAN.LDD), opens the decoder device (BAR:),
 * and dumps every byte of each read so the decoded format (length, any prefix
 * or type byte, terminator) can be confirmed.
 *
 * The load and open results are printed and then a key is waited for BEFORE
 * anything else, so the numbers stay on screen even if the open fails (a failed
 * open would otherwise return instantly and the System screen would wipe the
 * message). Blocking I/O throughout; exit via the System screen.
 */
#include <plib.h>
#include "bcode.h"

GLDEF_C INT main(VOID)
{
    VOID *chan;
    UBYTE buf[64];
    INT   loadErr, openErr, n, i;

    loadErr = bcodeLoad();
    openErr = bcodeOpen(&chan);

    /* Show both results and hold the screen until a key is pressed. */
    p_printf("load %s.LDD : %d\n", BCODE_LDD, loadErr);
    p_printf("open %s    : %d\n", BCODE_DEV, openErr);
    p_printf("\n(0 = ok; for load, an 'already loaded' error is also ok)\n");
    p_printf("Press a key to continue...\n");
    p_getch();

    if (openErr < 0)
        return 1;

    p_printf("\n%s open. Scan a barcode. Exit via the System screen.\n\n",
             BCODE_DEV);

    for (;;) {
        n = p_read(chan, buf, sizeof(buf));
        if (n < 0) {
            p_printf("read err %d\n", n);
            continue;
        }
        if (n == 0)
            continue;
        p_printf("n=%d:", n);
        for (i = 0; i < n; i++)
            p_printf(" %d", buf[i]);
        p_printf("  \"");
        for (i = 0; i < n; i++)
            p_putch(buf[i] >= ' ' ? buf[i] : '.');
        p_printf("\"\n");
    }
}