/*
 * bcode.c - barcode scanner serial channel (see bcode.h).
 */
#include "bcode.h"

GLDEF_C INT bcodeOpen(VOID **pChan)
{
    /*
     * TTY:D = the top internal slot's serial port, where the barcode module
     * sits. mode -1 asks the driver for its default open mode.
     *
     * If the scanner needs specific line settings (baud rate, parity, stop
     * bits), configure the channel after opening with
     *     p_iow(*pChan, P_FSET, &config);
     * where config is an E_CONFIG struct from p_config.h. See the RS232
     * section of the PLIB Reference. The module runs at up to 9600 baud.
     */
    return p_open(pChan, "TTY:D", (UINT)-1);
}

GLDEF_C VOID bcodeClose(VOID *chan)
{
    if (chan != NULL)
        p_close(chan);
}

GLDEF_C INT bcodeAssemble(UBYTE *raw, INT n, TEXT *line, INT *pLen, INT max)
{
    INT i;

    for (i = 0; i < n; i++) {
        UBYTE c = raw[i];

        if (c == BCODE_TERM) {
            line[*pLen] = '\0';
            *pLen = 0;
            return 1;
        }
        if (c < ' ')          /* skip LF, NULs and other control bytes */
            continue;
        if (*pLen < max - 1)
            line[(*pLen)++] = (TEXT)c;
        /* else: overflow - drop until the next terminator */
    }
    return 0;
}