#include <std.h>

char* itoa(int n, char *a)
{
	char *ret = a;
	if(n < 0) {
		*a++ = '-';
		n *= -1;
	}
	char *b = a;
	if(!n) *b++ = '0';
	for(; n; b++) {
		*b = n%10 + '0';
		n = n/10;
	}
	*b-- = '\0';
	for(; a < b; a++, b--) { //reverse
		char temp = *b;
		*b = *a;
		*a = temp;
	}
	return ret;
}

char* ftoa(double x, char *a, unsigned int prec)
{
	char *ret = a;
	int n = (int) x; //integer part
	double d = x - (double) n; //fractional part;
	itoa(n, a);
	if(prec) {
		while(*a && *++a);
		int i;
		*a++ = '.';
		for(i = 0; i < prec; i++) {
			d = d*10;
			*a++ = ((int) d) + '0';
			d -= (int) d;
		}
		*a = '\0';
	}
	return ret;
}

int atoi(char *a)
{
	int neg = 0;
	int n = 0;
	if(*a == '-') {
		neg = 1;
		a++;
	}
	while(*a >= '0' && *a <= '9')
		n = n*10 + (*a++ - '0');
	if(neg) n *= -1;
	return n;
}

double atof(char *a)
{
	int n = atoi(a);
	double x = 0;
	double dec = .1;
	while(*a++ != '.');
	while(*a != '\0') {
		x += (*a - '0')*dec;
		dec *= .1;
		a++;
	}
	return n + x;
}

void sPrint(char *a)
{
	char *b = a;
	while(*b && *++b);
	putline(a, b - a);
}

int strcmp(const char *a, const char *b)
{
	while(1) {
		if(*a - *b) return *a - *b;
		if(*a == '\0') return 0;
		a++;
		b++;
	}
	return -1;
}

void sGet(char *a, unsigned int n) //TODO bug Jeff about getline
{
	int length = getline(a, n);
	a[(length < n)?length:n - 1] = '\0';
}

int arrayLookup(char *text, const char array[][10], int last)
{
	int i;
	for(i = 0; i < last; i++)
		if(!strcmp(array[i], text)) return i;
	return last;
}

char* append(char *dest, char *src)
{
	char *ret = dest;
	while(*dest&& *++dest); //get to null in first string
	while((*dest++ = *src++));
	return ret;
}