mod_code v.3

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


extern int errno;


int main(int argc, char *argv[])
{
  /*if(argc != 2) {
    fprintf(stderr, "Invalid input\n");
    exit(1);
  }*/

  FILE* fp;
  char *orig = "func";
  char *new = "printf";

  int ch;

  fp = fopen("code_to_change.c", "r+");
  if(fp = NULL) {
    fprintf(stderr, "Cannot open file\n");
    fclose(fp);
    exit(1);
  }
  else if(errno != 0) {
    fprintf(stderr, "Unexpected error\n");
    fclose(fp);
    exit(1);
  }
  else {
    return 0;
  }

  ch = fscanf(fp, "func");
  if(ch) {
    strcpy(orig, new);
    return 0;
  }

  else  if(!ch) {
    fprintf(stderr, "Error blyat\n");
    return 1;
  }

  else {
    printf("Unexpected error\n");
    fclose(fp);
    exit(1);
fclose(fp);

 /* fp = popen("gcc argv[1] -o compilated", "r");
  if(fp == NULL) {
    fprintf(stderr, "Fuck you bitch!\n");
    pclose(fp);
    return 1;
  }

  pclose(fp); */

  system("gcc code_to_change.c -o changed_code");

  return 0;
}