#include "string.h"
#include "memory.h"

void*
memset(void *dest, int c, size_t n)
{
    char *destc = (char*)dest;
    for(size_t i = 0; i < n; i++)
        destc[i] = c;
    return dest;
}

void*
memcpy(void *dest, const void *src, size_t n)
{
    char *destc = (char*)dest;
    const char *srcc = (const char*)src;
    for(size_t i = 0; i < n; i++)
        destc[i] = srcc[i];
    return dest;
}

void*
memmove(void *dest, const void *src, size_t n)
{
    char *destc = (char*)dest;
    const char *srcc = (const char*)src;
    if(destc + n < srcc) return memcpy(dest, src, n);
    char buffer[n];
    memcpy(buffer, src, n);
    return memcpy(destc, buffer, n);
}

int
memcmp(const void *a, const void *b, size_t n)
{
    const char *ac = (const char*)a;
    const char *bc = (const char*)b;
    for(size_t i = 0; i < n; i++) {
        if(ac[i] != bc[i]) return ac[i] - bc[i];
    }
    return 0;
}

char*
strdup(const char *s)
{
    size_t slen = strlen(s);
    char *ret = kmalloc(slen);
    memcpy(ret, s, slen);
    return ret;
}