Objective

The program reads a file containing song information, stores the details in dynamically allocated structures, and prints the song details of every 5 songs starting from first song. The song information includes the genre, artist, and title of each song.

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Requirements

File Format
- Each song entry is enclosed between +++ BEGIN and --- END.
- Within each song entry, the information is formatted as key-value pairs:
  - genre:
  - artist:
  - title:
- The keys (genre, artist, title) are followed by a colon and a space, and the values are strings.
- The file contains an unknown number of songs
```
+++ BEGIN
    genre:Dance
    artist:Ariana Grande
    title:7 rings
--- END
+++ BEGIN
    genre:Dance
    artist:Halsey
    title:Without Me
--- END
    
```
Song Struct

Song struct holds a single song's information

It is made up of 3 c-strings of varying lengths


#define MAX_GENRE_LENGTH 30
#define MAX_ARTIST_LENGTH 50
#define MAX_TITLE_LENGTH 100


typedef struct Song {
    char genre[MAX_GENRE_LENGTH];
    char artist[MAX_ARTIST_LENGTH];
    char title[MAX_TITLE_LENGTH];
} Song;

Remove unwanted characters from end of line: remove_char_from_end(char * str, char char_to_remove)
- Check if provided c-string ends withe char_to_remove
- If so, remove the last character from the c-string
Read and Load Songs: Song* read_songs_from_file(const char *filename, int *count)

Open file using provided filename

Allocate initial memory for songs, capacity = 10, don't forget sizeof()

Allocated memory will put each Song right next to each other in memory

The allocated heap will look like this:


  Memory Address      | Data (Song Struct)
  --------------------|---------------------------------------------------------
  0x1000              | Song 1
  0x1000 - 0x101D     |   genre (30 bytes)
  0x101E - 0x1049     |   artist (50 bytes)
  0x104A - 0x10D3     |   title (100 bytes)
  --------------------|---------------------------------------------------------
  0x10D4              | Song 2
  0x10D4 - 0x10F1     |   genre (30 bytes)
  0x10F2 - 0x111D     |   artist (50 bytes)
  0x111E - 0x11A7     |   title (100 bytes)
  --------------------|---------------------------------------------------------
  0x11A8              | Song 3
  0x11A8 - 0x11C5     |   genre (30 bytes)
  0x11C6 - 0x11F1     |   artist (50 bytes)
  0x11F2 - 0x127B     |   title (100 bytes)
  --------------------|---------------------------------------------------------

While getline (using getline, which auto allocates on the heap any size of input)
- If +++BEGIN check
  - If song_index is >= capacity, then allocate more space for list
  - Use memset to set all the strings in the struct to 0 for the current array location
  - If unsure about memset, then watch this video on memset
- Clean up line using remove_char_from_end
- If genre: artist: title: in line then
  - Copy the value to the structure using strncpy
  - Add null terminator to the end of the field (Use MAX value) b/c strncpy does not guarantee null termination when value is longer than genre's max size
Set count pointer equal to song_index + 1
Close file and free line

The main function

Check that file argument was provided otherwise print usage message and exit
Call read_songs_from_file
Print every fifth song from the heap-based array
Free songs

Steps to Complete

Implement the requirements
Compile and test the program
Run /challenge/tester
Get flag

Project 5.0 Prolog

Challenges