/*to use exit*/
#include <stdlib.h>
/*to use *print**/
#include <stdio.h>
/*to user file2char*/
#include "file2char.h"

int convert_file2char(char const* path, char **buf){
  /*declarations*/
  FILE *fp;
  long lSize;

  /*TODO Check path for validity!*/
  /*fopen()
   *filename
   *mode
   *return: set errno value in error case
   */
  fp=fopen(path,"r");

  if(fp){
    fprintf(stdout,"file opened.\n");

    /*set offset to file end*/
    /*fseek()
     *stream
     *offset
     *origin
     */
    fseek(fp,0L,SEEK_END);
    if (ferror(fp)){
      printf ("Error seeking file\n");
    }

    /*get file size*/
    lSize = ftell( fp );
    fprintf(stdout,"lSize: %ld.\n",lSize);

    /*set offset to file start*/
    fseek(fp,0,SEEK_SET);
    if (ferror(fp)){
      printf ("Error seeking file\n");
    }

    /*allocate memory for entire content + null termination*/
    *buf=(char *)malloc((lSize+1)*sizeof(char));
    if(!*buf){
      fclose(fp);
      fputs("Error allocating memory",stderr);
      exit(EXIT_FAILURE);
    }
    fprintf(stdout,"mem allocated.\n");

    /*copy file into buffer*/
    /*fread()
     *ptr
     *size
     *count
     *stream
     */
    if( 1!=fread(*buf,lSize,1,fp)){
      fclose(fp);
      free(*buf);
      fputs("Error reading entire file",stderr);
      exit(EXIT_FAILURE);
    }
    fprintf(stdout,"file read.\n");

    /*close file*/
    if(EOF==fclose(fp)){
      free(*buf);
      exit(EXIT_FAILURE);
    }
    fprintf(stdout,"file closed.\n");

    (*buf)[lSize] = '\0';
    fprintf(stdout,"mem null terminated.\n");
  }else{
    perror(path);
    exit(EXIT_FAILURE);
  }
  /*done*/
  return 0;
}