Brute Force Prototype

#include <stdio.h>#include <stdlib.h>#include <string.h>void printback();char *buffer;const int range = 'a'+26;int length = 0;int spin(register char* p){	for (*p='a';*p<range;*p+=1)    {        if (p < buffer+length)		{            spin(p+1);		}		printf(" %s\n",buffer);    }	(*p)--; //fixes special case parent foobar    return 1;}/* * ./recurse <num_chars> */int main(int argc, char ** argv){    int i;    if (argc!=2) return argc;    int pass_length = atoi(argv[1]);    buffer = (char *) calloc(pass_length+1,sizeof(char));    buffer[pass_length]='\0';        /* This is a call to a recursive function */	for(i=0;i<=pass_length-1;i++){    	memset(buffer,'\0',pass_length);		length = i;		spin(buffer);	}    return 0;}