practicing.c

/*
 *
 *  learning_c
 *
 *  Created by Constantine on 7/5/10.
 *
 */

#include <stdio.h>
#include <stdbool.h>
#include <string.h>     // declares strcmp().
#include <stdlib.h>     // We'll need that later for malloc() and realloc

struct BookmarksEntry
{
	// right now this has a limitation of 255 characters for a URL, 
	// will look into how to do it longer
	char url[255];
	char description[500];
	int rating;
	bool isSfw;
};

// track the amount of "database" entries
int totalDBEntries = 0;
struct BookmarksEntry *myBookmarks = NULL;


void CreateNewEntry()
{
	int sfw = 0;
	// should create new entry in the myBookmarks struct
	// find the length or size of the myBookmarks variable
	// realloc the current myBookmarks and add one to the current size
	// then use the last item in the array to store the entry
	if (myBookmarks == NULL)
	{
		myBookmarks = malloc(sizeof(struct BookmarksEntry));
		if (myBookmarks == NULL)
			printf("ERROR, WE GOT PROBLEMS");
		return;
	}
	else 
	{
		struct BookmarksEntry *newPtr = NULL;
		// takes the existing bookmarks db, the count of how many db items we have, and the size of the struct we made
		// to assign it to a new pointer
		// the reason we dont directly assign it is because we can run into out of memory errors
		
		newPtr = realloc(myBookmarks, (totalDBEntries+1) *sizeof(struct BookmarksEntry));
		if (newPtr == NULL)
		{
			printf("OOM :(");
			return;
		}
		myBookmarks = newPtr;
	}
	
	++totalDBEntries;
	
	printf("Enter a URL for your bookmark:\n>");
	scanf("%255s", myBookmarks[totalDBEntries -1].url);
	fpurge( stdin );
	
	printf("Enter a description:\n>");
	scanf("%500s", myBookmarks[totalDBEntries -1].description);
	fpurge( stdin );
	
	printf("Enter a rating, 1-6 (neutral midpoint):\n>");
	scanf("%d", &myBookmarks[totalDBEntries -1].rating);
	fpurge( stdin );
	
	printf("Is this safe for work? (1 for yes, anything other number for no):\n>");
	scanf("%d", &sfw);
	if (sfw == 1) 
		myBookmarks[totalDBEntries -1].isSfw = true;
	else
		myBookmarks[totalDBEntries -1].isSfw = false;
	
}


void ListCurrentEntries()
{
	// lists all entries in the myBookmarks struct
	// walk through myBookmarks and list each entry
	int x = 0;
	while (x < totalDBEntries)
	{
		printf("Bookmark %d URL: %s \n", (x+1),myBookmarks[x].url);
		printf("Bookmark %d description: %s \n", (x+1), myBookmarks[x].description);
		printf("Bookmark %d rating: %d \n", (x+1), myBookmarks[x].rating);
		x+=1;
	}
		
}

void CleanMem()
{
	// cleans out the stored memory locations of everything we have done
	if (myBookmarks != NULL)
		free(myBookmarks);
	myBookmarks = NULL;
	totalDBEntries = 0;
	
}



int main()
{
	fpurge( stdin );

	char userInput[5];
	bool theNeverEndingStory = true;
	
	while (theNeverEndingStory == true)
	{
		printf("Please type new, list, or quit:\n");
		printf("new list quit:\n>");
		scanf("%5s", userInput);
		
		if(strcmp(userInput, "new") == 0)
			CreateNewEntry();
		if(strcmp(userInput, "list") == 0)
			ListCurrentEntries();
		if(strcmp(userInput, "quit") == 0)
			theNeverEndingStory = false;
		else printf("what the butt?");
	}
	
	CleanMem();
	
}