#include "stdlib.h"
#include "stdio.h"
#include "string.h"
#include "memory.h"

int rolld(int d) {
	return rand() % d + 1;
}

int rollnd(int n, int d, int* i) {
	int total=0;
	while(n-->0) {
		int roll = rolld(d);
		total += roll;
		if(i!=(void*)0)
			*(i++) = roll;
	}
	return total;
}

int process_dice_format(const char* format,int* num,int* die) {
	int dummy;					// dummy int for if either of the out adresses is 0
	if(num==(void*)0)num=&dummy;
	if(die==(void*)0)die=&dummy;
	char buf[10];
	memset(buf,0,10);			// clear buffer
	char* bufw=buf;
	const char* next=format;
	while(*next!='\0') {
		if(*next=='d') {		// argument is d in <num>d<die> format
			if(next==format)	// if there is no die count given, assume 1
				*num=1;
			else
				*num=atoi(buf);	// store buffered string as number
			memset(buf,0,10); // clear buffer
			bufw=buf;			// reset buffer walker
			next++;				// skip
		}
		*bufw=*next;			// buffer next character
		bufw++;next++;			// increment walker and next character
	}
	*die=atoi(buf);
	return 0;
}

void roll_and_print(int n, int d) {
	int* out_rolls=malloc(sizeof(int)*n);
	int result=rollnd(n,d,out_rolls);
	printf("    %d (%dd%d) ",result,n,d);
	// only print inbetween steps if there are any
	if(n>1) {
		for(int i=0;i<n;++i) {
			printf("%d%s",out_rolls[i],i==n-1?"\n":"+");
		}
	} else {
		printf("\n");
	}
	free(out_rolls);
}