#include "str.h"

i32 strcopy(char *to, const char *from, u32 length) {
    u32 i;
    if (to == nil || from == nil) return -1;
    if (length == 0) {return 0;}
    for (i = 0; i < length - 1 && from[i] != '\0'; i++) {
        to[i] = from[i];
    }
    to[i] = '\0';
    return 0;
}

bool streq(const char *s1, const char *s2) {
    if (s1 == nil && s2 == nil) return true;
    if (s1 == nil || s2 == nil) return false;

    while (*s1 && *s2) {
        if (*s1 != *s2) return false;
        s1++;
        s2++;
    }

    return (*s1 == '\0' && *s2 == '\0');
}


u32 strlen(const char *str) {
    u32 i;
    if (str == nil) {return 0;}
    for (i = 0; str[i] != '\0'; i++) {
        ; /* twiddle thumbs, 'i' is doing all the work*/
    }
    return i;
}

u32 strnlen(const char *str, u32 max_len) {
    u32 i;
    if (str == nil) {return 0;}
    for (i = 0; i < max_len && str[i] != '\0'; i++) {
        ; /* twiddle thumbs, 'i' is doing all the work*/
    }
    return i;
}