file.c

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#include "file.h"
#include <stdio.h>
/*
 * Here we load a file and write the file as string to a memory address:
 * Input:
 *      char* fname: the name of the file to open
 *      int cbSize: the size of the strContent
 * Output:
 *      char **strContent: a pointer to a address where you have to allocate enougth memory to store the whole file
 *      int neededSize: this returns the needed size of the buffer strContent
 *
 *  Note:
 *      to get the size define strContent as NULL, then the needed size will return the needed buffersize
 *
 *
 */
int getFile(char *fname, char **strContent,int cbSize,long *neededSize)
{
    FILE *hfile = fopen(fname,"r");
    long file_size=0;
    int ret=0;
    if(hfile == NULL)
    {
        return FILE_ERROR_OPEN;
    }
    
    printf("file openend:%s",fname);
   fseek(hfile,0,SEEK_END);
   file_size = ftell(hfile);
    if(strContent == NULL) //we must determine the size and return to neededSize
    {
        *neededSize = file_size+1;
        fclose(hfile);
        return NO_ERROR;
    }
 
    if(cbSize < file_size)
    {
        *neededSize = file_size+1; //null terminator
        fclose(hfile);
        return FILE_ERROR_STRCONTENT_TO_SMALL;
    }
 
    fseek(hfile,0,SEEK_SET);
    ret=fread(*strContent,file_size,1,hfile);
    if(ret != 1)
    {
        printf("Reading error read and should read missmatch\nnumber written elements:%d\n",
                ret);
        fclose(hfile);
        return FILE_ERROR_READ_MISMATCH;
    }
    //buffer end-1 = \0
    //buffer end-2 = \n
    //buffer end-3 = last character
    printf("strcontent: %ld, [%c]\n",*neededSize,*(*strContent+ *neededSize-3));
    *(*strContent + *neededSize -1) ='\0';
    printf("after zero assign: %ld, %s\n",*neededSize,(*strContent+ *neededSize-1));
    //printf("content:%s",*strContent);
    fclose(hfile);           
    return NO_ERROR;
}