Thread: extracting a specific part out of a string (errors in my code?)

Hello guys,

I have the following task to do:

given a string (char * buf) in a specific way ("putfile $[path of file]") I want to extract the filename out of the filepath with a function called extract_name.

Here's the code:

Code:

char* extract_name(char* buf){
	int length = strlen(buf)-1;
	int count  = -1;
	int i = 0;
	char * fname;
	char c;
	for(i = length; i>=0; i--){	//go backwards through string to gain knowledge of filename length
		c = buf[length];
		if((c == '/') || (c == '\\') || (c == '$')){ //either of these chars show me I have reached the
													 //beginning of my filename, so I leave the loop
			break;
		}
		count++;
		length--;
	}
	fname = (char*)calloc(count+1, sizeof(char));	//allocate free space
	fname[count+1] = '\0';							//put string termination symbol
	length = strlen(buf)-1;							//reset length
	
	for(i = count; i>=0; i--){						//go backwards through string
		fname[i] = buf[length];						//and set the characters accordingly
		i--;
		length--;
	}
	return fname;									//return pointer to name
}

Now, my problem is, that I get no filename back. It's just empty.

Maybe you need to see this part of code too?

Code:

        char *name;
        name = extract_name(message);
	path  = (char*)calloc(10 + strlen(act_user->username) + strlen(name), sizeof(char)); 
									
									
	sprintf(path, "./uploads/%s/%s",act_user->username,name); //create  path-string

Anyone can tell me where exactly my error is? Or should I do it in a different way alltogether?