Thread: Reading a txt file into an array: unexpected segfault

Hi to all!

I have this function that, provided with a target array of strings and a file name, reads it line by line and stores the lines into the given array

Code:

void file_to_array(char **target_lines, char *file_name)
{
	FILE *f;
	char line[LINE_SIZE];
	int num_righe = 0;
	
	f = fopen(file_name, "r");
	/* crea il file se non lo trova */
	if(f == NULL) {
		f = fopen(file_name, "w");
	}
	
	while(fgets(line, LINE_SIZE, f)) {		
		num_righe++;
		target_lines = (char**)realloc(target_lines, (sizeof(char*)*num_righe));
		target_lines[num_righe-1] = strdup(line);
	}

	fclose(f);
}

Calling it like follows it gives me a Segmentation fault in the line where I try to print the second item.

Code:

char **lines = NULL;
file_to_array(lines, "spese.dat");
printf("%s", lines[0]);

The file is correct and outputting like by line within the function ( printf("%s", target_lines[num_righe-1]) ) gives the correct lines.

Any help?
Thanks in advance