C poly

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

#include "error.h"
#include "poly.h"

int i = 0;
int j = 0;

typedef struct poly_t poly_t;
struct poly_t {
  int* coef;
  int* expo;
  char* sign;
  int size;
};

poly_t*		new_poly_from_string(const char* c){
  poly_t *p = malloc(sizeof(poly_t));
  p->coef = malloc(sizeof(p->coef));
  p->expo = malloc(sizeof(p->expo));
  p->sign = malloc(sizeof(p->sign));

  //int b = 0;
  int size = 0;
  int index = strlen(c);
  for (i = 0; i < index; i++){ //while (c[index] != EOF){
    if (c[i] == '\n'){
      return p;
    }
                                //(x^2 - 7x + 1)
    if (c[i] == 'x'){
      if (c[i+1] == '^'){
        printf("c+1: %c\n", c[i+1]);
        printf("c+2: %c\n", c[i+2]); // När denna skrivs ut blir den 2
        p->coef[size] = 1;
        printf("Coeff = 0\n");
        p->expo[size] = c[i+2]; //När denna skrivs ut iraden under blir den 50
        printf("hej:%d\n", p->expo[size]);
        i+=2;
      } else {
        p->coef[size] = 0;
        p->expo[size] = c[0];
        i+=1;
      }
      if (i > 1){
        if (c[i-2] == '+'){
        p->sign[size] = '+';
        }else {
        p->sign[size] = '-';
        }
      }
    }else if (c[i] == ' '){
     size++;
     p->coef = realloc(p->coef, sizeof(int));
     p->expo = realloc(p->expo, sizeof(int));
     p->sign = realloc(p->sign, sizeof(int));
   }
//    printf("hej %c\n", c[i]);
  }
  p->size = size;
  return p;
}


void		free_poly(poly_t* p){
  free(p->coef);
  free(p->expo);
  free(p->sign);
  free(p);
}

poly_t*		mul(poly_t* p1, poly_t* p2){
  int s = 0;
  poly_t *p = malloc(sizeof(*p));
  p->coef = malloc(sizeof(p->coef));
  p->expo = malloc(sizeof(p->expo));
  p->sign = malloc(sizeof(p->sign));
  for (i=0; i < p1->size; i ++){
    for (j=0; j < p2->size; i++){
      p->coef[s] = p1->coef[i]*p2->coef[j];
      p->expo[s] = p1->expo[i]+p2->expo[j];
      if (p1->sign[i] != p2->sign[j]){
        p->sign[s] = '-';
      }else {
        p->sign[s] = '+';
      }


    }
  }
  return p;
}

void		print_poly(poly_t* p){
  int index = p->size;
  printf("storlek: %d\n", index);
    for (i = 0; i < index; i++){
      printf("coef= %d\n", p->coef[i]);
      printf("expo= %d\n", p->expo[i]);
      printf("sign= %d\n", p->sign[i]);
    }


}