Beispiel #1
0
void	*malloc(size_t size)
{
  void	*ptr;
  if (start == NULL)
    {
      start = sbrk(0);
      end = start;
    }
  #ifdef DEBUG
  printf("start = %p, end = %p\n", start, end);
  #endif
  ptr = findMemory(start, end, size);
  #ifdef DEBUG
  printf("\nafter findMemory ptr = %p\n", ptr);
  #endif
  if (addMemory(start, &end, &ptr, size) == 0)
    return (0);
  #ifdef DEBUG
  printf("\nafter addMemory ptr = %p\n", ptr);
  printf("after addMemory start = %p, end = %p\n", start, end);
  #endif
  useMemory(ptr, end, size);
  ptr += sizeof(t_metadata);
  #ifdef DEBUG
  printf("\n\n");
  #endif
  return(ptr);
}
Beispiel #2
0
/**
 * Inserting files into the disk
 * @param const char* File Name
 * @param int Size of file to be inserted
 * @return FileSysErrors Errors for the function that have occurred
 */
FileSysErrors createFile(const char* filename, int size)
{
	FileSysErrors errors;
	
	/* Error Checking Needed:
	 * • Returns DIRECTORY_FULL if maxfiles used
	 * • Returns DUPLICATE_NAME if there is already a file with the name
	 * • Returns ZERO_SIZE if size <= 0
	 * • Returns CREATE_FAIL if unable to find space for the file
	 */
	
	// 1. Check for simple errors before inserting
	errors = createFileErrorChecking(filename, size);
	
	if (errors != NO_ERR) {
		// Exit out
		return errors;
	} else {
		
                // 1. Check for full directory
                //if (DirectoryEntries > MAXFILES) {
                //    return DIRECTORY_FULL;
                //}
            
		// 2. Check for space and position to insert into HDD
		int position = findMemory(size);
		
		if (position < 0) {
			errors = CREATE_FAIL;
			return errors;
		} else {
			
			// 3. Insert into directory
			int count = 0;
			for (count = 0; count < MAXFILES; count++) {
				if (Directory[count].Size == 0) {
					
					// Copy in data
					strcpy(Directory[count].FileName, filename);
					Directory[count].Start = position;
					Directory[count].Size = size;
					
					break;
				}
			}
			
			// 4. Insert into Disk
			for (count = 0; count < size; count++) {
				// Mark positions as read
				Disk[position] = 1;
				
				// Increment the position
				position++;
			}
			
			// Update stats
			FilesCreated++;
			
			// All is good, return no error
			errors = NO_ERR;
			return errors;
		}
		
	}
}