seqnum.c

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

void seqnum_init(uint32_t *seq, uint32_t initial)
{
    if (seq == NULL)
    {
        return;
    }
    *seq = initial;
}

uint32_t seqnum_next(uint32_t *seq)
{
    if (seq == NULL)
    {
        return 0;
    }
    return ++(*seq);
}

int seqnum_is_newer(uint32_t a, uint32_t b)
{
    return (uint32_t)(a - b) < (uint32_t)(UINT32_MAX / 2U);
}

int seqnum_in_window(uint32_t seq, uint32_t base, uint16_t window_size)
{
    return (uint32_t)(seq - base) < (uint32_t)window_size;
}