Word Unperfect - XT-Emporium

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#include "wp_layout_engine.h"
#include <stdint.h>
#include <stddef.h>

void
wp_primary_buffer_bind_bytes_lifo(WpLayoutGlobals *wl,
                                  uint8_t *first,
                                  int count,
                                  uint buffer_space)
{
    if (wl == NULL) {
        return;
    }
    if (first == NULL || count <= 0) {
        wl->primary_record.word = (intptr_t)first;
        wl->record_used_bytes = 0;
    } else {
        wl->primary_record.word = (intptr_t)(first + count);
        wl->record_used_bytes = count;
    }
    wl->record_buffer_space = buffer_space;
}

uint8_t
consume_byte_from_primary_buffer(WpLayoutGlobals *wl)
{
    uint8_t *record_byte_cursor;

    if (wl == NULL || wl->record_used_bytes <= 0 ||
        wl->primary_record.as_record_p == NULL) {
        return 0U;
    }

    wl->record_used_bytes--;
    record_byte_cursor = (uint8_t *)wl->primary_record.as_record_p - 1;
    wl->primary_record.as_record_p = (uint16_t *)record_byte_cursor;
    wl->record_buffer_space++;
    return *record_byte_cursor;
}

uint16_t
consume_word_from_primary_buffer(WpLayoutGlobals *wl)
{
    uint8_t lo;
    uint8_t hi;

    lo = consume_byte_from_primary_buffer(wl);
    hi = consume_byte_from_primary_buffer(wl);
    return (uint16_t)((uint16_t)lo | ((uint16_t)hi << 8));
}

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