cstring_fit.h

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#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <string.h>


static inline void cstring_fit(char *dst, const char *src, size_t size)
{
    if (size == 0)
    {
        return;
    }
 
    if (!src)
    {
        dst[0] = '\0';
        return;
    }
 
    strncpy(dst, src, size - 1);
    dst[size - 1] = '\0';
}

static inline bool cstring_fit_same(const char *current, const char *value, size_t size)
{
    if (size == 0)
    {
        return true;  // nowhere to put it, so nothing about the buffer can move
    }
 
    size_t room = size - 1;
    size_t incoming = strlen(value);
    if (incoming > room)
    {
        incoming = room;
    }
 
    return strlen(current) == incoming && strncmp(current, value, incoming) == 0;
}