// MIT License, Copyright (c) 2021 Marvin Borner

#include <lib.h>

/**
 * Common string functions
 */

u32 strlen(const char *str)
{
	const char *s = str;
	while (*s)
		s++;
	return s - str;
}

u32 strnlen(const char *str, u32 max)
{
	const char *s = str;
	while (max && *s) {
		s++;
		max--;
	}
	return s - str;
}

u32 strlcpy(char *dst, const char *src, u32 size)
{
	const char *orig = src;
	u32 left = size;

	if (left)
		while (--left)
			if (!(*dst++ = *src++))
				break;

	if (!left) {
		if (size)
			*dst = 0;
		while (*src++)
			;
	}

	return src - orig - 1;
}

/**
 * Conversion
 */

int itoa(s32 value, char *buffer, u32 base)
{
	char tmp[16];
	char *tp = tmp;
	int i;
	unsigned v;

	int sign = (base == 10 && value < 0);
	if (sign)
		v = -value;
	else
		v = (unsigned)value;

	while (v || tp == tmp) {
		i = v % base;
		v /= base;
		if (i < 10)
			*tp++ = i + '0';
		else
			*tp++ = i + 'a' - 10;
	}

	int len = tp - tmp;

	if (sign) {
		*buffer++ = '-';
		len++;
	}

	while (tp > tmp)
		*buffer++ = *--tp;
	*buffer = '\0';

	return len;
}