Removed hash related stuff (kept in misc.c file just in case). Prototype implementation of truncate_string_utf8.

1 files changed, 0 insertions, 724 deletions

diff --git a/task_tracker.c b/task_tracker.c
deleted file mode 100644
index 02ed8c3..0000000
--- a/task_tracker.c
+++ /dev/null
@@ -1,724 +0,0 @@
-// Compilation command:
-// - release: gcc task_tracker.c -Wall -O2 -m64 -lncurses -o task_tracker.x64
-// - debug  : gcc task_tracker.c -Wall -g3 -m64 -lncurses -o task_tracker.x64
-
-
-#include <assert.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <ncurses.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#define STR_(X) #X				// Convert to string.
-#define STR(X) STR_(X)			// Force argument expansions before converting to string.
-
-#define MAX_TASK_NAME 127
-#define FIRST_DAY_OF_WEEK 1		// (0-6, Sunday = 0)
-
-#define LOG_FILE_NAME "log.txt"
-#define DB_BIN_PATH_NAME "./database.bin"
-#define DB_CSV_PATH_NAME "./database.csv"
-
-
-
-
-typedef struct {
-	char		name[MAX_TASK_NAME+1];	// Allow space for null termination char.
-	uint32_t	time[7];
-	uint8_t		state;
-	uint32_t	hash;					// TODO Is this an overkill? Maybe decouple from task_t?
-} task_t;
-
-
-const char* DB_BIN_FILE_SIGNATURE = "TTBF:1.0";
-const uint8_t DB_BIN_FILE_SIGNATURE_SIZE = sizeof(DB_BIN_FILE_SIGNATURE);
-const size_t SIZEOF_TASK_T = sizeof(task_t);
-const char* DAYS_OF_WEEK[] = { "sun", "mon", "tue", "wed", "thu", "fri", "sat" };
-const uint8_t DAYS_ON_WEEK = sizeof(DAYS_OF_WEEK)/sizeof(char*);
-
-task_t* tasks = NULL;
-uint32_t tasks_count = 0;
-uint32_t tasks_capacity = 0;
-uint32_t selected_task = -1;
-
-
-char* replace_char(char* string, char find, char replace){
-	char *idx = string;
-	while((idx = strchr(idx, find)) != NULL) {
-		*idx = replace;
-		*idx++;
-    }
-    return string;
-}
-
-uint32_t CRC32(const uint8_t data[], size_t data_length) {
-	
-	static const uint32_t crc32_table[] = {
-		0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
-		0xe963a535, 0x9e6495a3,	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
-		0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
-		0xf3b97148, 0x84be41de,	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
-		0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,	0x14015c4f, 0x63066cd9,
-		0xfa0f3d63, 0x8d080df5,	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
-		0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,	0x35b5a8fa, 0x42b2986c,
-		0xdbbbc9d6, 0xacbcf940,	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
-		0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
-		0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
-		0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,	0x76dc4190, 0x01db7106,
-		0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
-		0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
-		0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
-		0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
-		0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
-		0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
-		0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
-		0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
-		0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
-		0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
-		0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
-		0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
-		0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
-		0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
-		0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
-		0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
-		0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
-		0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
-		0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
-		0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
-		0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
-		0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
-		0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
-		0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
-		0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
-		0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
-		0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
-		0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
-		0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
-		0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
-		0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
-		0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
-	};
-	
-	uint32_t crc32 = 0xFFFFFFFFu;
-	
-	for (size_t i = 0; i < data_length; i++) {
-		const uint32_t lookupIndex = (crc32 ^ data[i]) & 0xff;
-		crc32 = (crc32 >> 8) ^ crc32_table[lookupIndex];
-	}
-	
-	// Finalize the CRC-32 value by inverting all the bits
-	crc32 ^= 0xFFFFFFFFu;
-	return crc32;
-}
-
-uint32_t hash_string(const char* string) {
-	size_t data_length = strlen(string);
-	uint8_t* data = (uint8_t*)string;
-	return CRC32(data, data_length);
-}
-
-void print_task(const task_t* task) {
-	printf("name: '%s'\n", task->name);
-	printf("hash: '%" PRIu32 "'\n", task->hash);
-	printf("t[0]: '%" PRIu32 "'\n", task->time[0]);
-	printf("t[1]: '%" PRIu32 "'\n", task->time[1]);
-	printf("t[2]: '%" PRIu32 "'\n", task->time[2]);
-	printf("t[3]: '%" PRIu32 "'\n", task->time[3]);
-	printf("t[4]: '%" PRIu32 "'\n", task->time[4]);
-	printf("t[5]: '%" PRIu32 "'\n", task->time[5]);
-	printf("t[6]: '%" PRIu32 "'\n", task->time[6]);
-}
-
-void store_database(const task_t* database, uint32_t number_of_entries, const char* path_name) {
-	
-	assert(database != NULL);
-	assert(path_name != NULL);
-	
-	// Open file.
-	FILE* file = fopen(path_name, "w");
-	if (file == NULL) {
-		fprintf(stderr, "Failed to open database file: %s.\n", strerror(errno)); // TODO Fix message.
-		return;
-	}
-	
-	fwrite(DB_BIN_FILE_SIGNATURE, sizeof(char), DB_BIN_FILE_SIGNATURE_SIZE, file);
-	fwrite(&number_of_entries, sizeof(number_of_entries), 1, file);
-	fwrite(database, SIZEOF_TASK_T, number_of_entries, file);
-	
-	fclose(file);
-}
-
-uint32_t load_database(task_t** database, const char* path_name) {
-	
-	assert(database != NULL);
-	assert(path_name != NULL);
-	
-	// Open file.
-	FILE* file = fopen(path_name, "r");
-	if (file == NULL) {
-		fprintf(stderr, "Failed to open database file '%s': %s.\n", path_name, strerror(errno)); // TODO Fix message.
-		return 0;
-	}
-	
-	// Validate file signature.
-	char file_signature[DB_BIN_FILE_SIGNATURE_SIZE];
-	fread(&file_signature, sizeof(char), DB_BIN_FILE_SIGNATURE_SIZE, file);
-	if (strncmp(file_signature, DB_BIN_FILE_SIGNATURE, DB_BIN_FILE_SIGNATURE_SIZE) != 0) {
-		fprintf(stderr, "Invalid file signature.\n");
-		return 0;
-	}
-	
-	// Read number of entries.
-	uint32_t number_of_entries;
-	fread(&number_of_entries, sizeof(number_of_entries), 1, file);
-	
-	// Read database entries.
-	*database = calloc(number_of_entries, SIZEOF_TASK_T);
-	fread(*database, SIZEOF_TASK_T, number_of_entries, file);
-	
-	// Make sure we are reading all the file.
-	assert(fgetc(file) == EOF);
-	
-	fclose(file);
-	
-	return number_of_entries;
-}
-
-void export_database(const task_t* database, uint32_t number_of_entries, const char* path_name) {
-	
-	assert(database != NULL);
-	assert(path_name != NULL);
-	
-	FILE* file = fopen(path_name, "w");
-	if (file == NULL) {
-		fprintf(stderr, "Failed to open database file '%s': %s.\n", path_name, strerror(errno)); // TODO Fix message.
-		return;
-	}
-	
-	fprintf(file, "%s,%s,%s,%s,%s,%s,%s,%s\n",
-		"task",
-		DAYS_OF_WEEK[0],
-		DAYS_OF_WEEK[1],
-		DAYS_OF_WEEK[2],
-		DAYS_OF_WEEK[3],
-		DAYS_OF_WEEK[4],
-		DAYS_OF_WEEK[5],
-		DAYS_OF_WEEK[6]
-	);
-	
-	for (uint32_t idx = 0; idx < number_of_entries; idx++) {
-		const task_t* task = &database[idx];
-		fprintf(file, "%s,%" PRIu32 ",%" PRIu32 ",%" PRIu32 ",%" PRIu32 ",%" PRIu32 ",%" PRIu32 ",%" PRIu32 "\n",
-			task->name,
-			task->time[0],
-			task->time[1],
-			task->time[2],
-			task->time[3],
-			task->time[4],
-			task->time[5],
-			task->time[6]
-		);
-	}
-	
-	fclose(file);
-}
-
-uint32_t import_database(task_t** database, const char* path_name) {
-	
-	assert(database != NULL);
-	assert(path_name != NULL);
-	
-	FILE* file = fopen(path_name, "r");
-	if (file == NULL) {
-		fprintf(stderr, "Failed to open database file '%s': %s.\n", path_name, strerror(errno)); // TODO Fix message.
-		return 0;
-	}
-	
-	uint32_t number_of_entries = 0;
-	uint32_t capacity = 0;
-	task_t task;
-	int error;
-	
-	fscanf(file, "%*[^\n]\n"); // Skip header line.
-	scan_csv: {
-		
-		error = fscanf(file,
-			"%" STR(MAX_TASK_NAME) "[^,],%" SCNu32 ",%" SCNu32 ",%" SCNu32 ",%" SCNu32 ",%" SCNu32 ",%" SCNu32 ",%" SCNu32 "\n",
-			task.name,
-			&task.time[0],
-			&task.time[1],
-			&task.time[2],
-			&task.time[3],
-			&task.time[4],
-			&task.time[5],
-			&task.time[6]
-		);
-		
-		if (error != EOF)
-		{
-			task.hash = hash_string(task.name);
-			number_of_entries++;
-			
-			// Expand tasks capacity if required.
-			if (number_of_entries > capacity) {
-				capacity = capacity == 0 ? 16 : capacity << 1;
-				*database = reallocarray(*database, capacity, SIZEOF_TASK_T);
-				if (errno != 0 || errno == ENOMEM) {
-					; // TODO reallocarray failed
-				}
-			}
-			memcpy(&((*database)[number_of_entries-1]), &task, SIZEOF_TASK_T);
-			
-			goto scan_csv;
-		}
-	}
-	
-	assert(number_of_entries == 3);
-	*database = reallocarray(*database, number_of_entries, SIZEOF_TASK_T);
-	// TODO check for allocation errors.
-// 	if (error != EOF) {
-// 		fprintf(stderr, "Failed to parse database file: %s.\n", strerror(errno));
-// 	}
-	
-	
-	fclose(file);
-	
-	return number_of_entries;
-}
-
-void add_task(char* name) {
-	
-	// Exit if task has already been added.
-	uint32_t name_hash = CRC32((uint8_t*)name, sizeof(name));
-	for (uint32_t idx = 0; idx < tasks_count; idx++)
-	{
-		if (name_hash == tasks[idx].hash && strcmp(name, tasks[idx].name) == 0)
-		{
-			return;
-		}
-	}
-	
-	// Expand tasks capacity if required.
-	if (tasks_count >= tasks_capacity)
-	{
-		tasks_capacity = tasks_capacity == 0 ? 16 : tasks_capacity << 1;
-		tasks = realloc(tasks, SIZEOF_TASK_T * tasks_capacity);
-	}
-	
-	// Add new task entry.
-	task_t* new_task = &tasks[tasks_count];
-	memset(new_task, '0', SIZEOF_TASK_T);
-	strncpy(new_task->name, name, MAX_TASK_NAME);
-	new_task->name[MAX_TASK_NAME] = '\0';
-	printf(">>> %s\n", new_task->name); // TODO debug
-	new_task->hash = name_hash;
-	tasks_count++;
-}
-
-void prototype() {
-	
-	const char* done = "# -- done -- -- -- /\n";
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Get current UTC time.
-	
-	fprintf(stderr, "# current UTC time --------------------------- \\\n");
-	time_t x = time(NULL);
-	printf("%s", ctime(&x));
-	fprintf(stderr, done);
-	
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Get current day of the week.
-	
-	fprintf(stderr, "# current day of the week --------------------- \\\n");
-	time_t now_ut = time(NULL);
-	uint8_t week_day = localtime(&now_ut)->tm_wday;
-	fprintf(stderr, "%d\n", week_day);
-	fprintf(stderr, done);
-	
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Prepare some data for testing.
-	
-	tasks_count = 3;
-	tasks = calloc(tasks_count, SIZEOF_TASK_T);
-	
-	task_t tmp[] = {
-		{
-			.name = "TASK-00 : Sample task name.",
-			.time = { 3,2,1,0,1,2,3 },
-			.hash = hash_string("TASK-00 : Sample task name.")
-		},
-		{
-			.name = "TASK-01 : A wild task appears",
-			.time = { 1,2,3,4,5,6,7 },
-			.hash = hash_string("TASK-01 : A wild task appears")
-		},
-		{
-			.name = "BAZINGA : Not a task!",
-			.time = { 11,22,33,44,55,66,77 },
-			.hash = hash_string("BAZINGA : Not a task!")
-		}
-	};	
-	memcpy(tasks, &tmp, SIZEOF_TASK_T * tasks_count);
-	
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Store database from memory to binary file.
-	
-	fprintf(stderr, "# store database ------------------------------ \\\n");
-	store_database(tasks, tasks_count, DB_BIN_PATH_NAME);
-	fprintf(stderr, done);
-	
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Load database from binary file to memory.
-	
-	fprintf(stderr, "# load database ------------------------------- \\\n");
-	task_t* task_load = NULL;
-	uint32_t number_of_entries_load = load_database(&task_load, DB_BIN_PATH_NAME);
-	
-	fprintf(stderr, "loaded %" PRIu32 " entries.\n", number_of_entries_load);
-	for (uint32_t idx = 0; idx < number_of_entries_load; idx++) {
-		print_task(&task_load[idx]);
-	}
-	free(task_load);
-	fprintf(stderr, done);
-	
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Export database to CSV file.
-	
-	fprintf(stderr, "# export to CSV ------------------------------- \\\n");
-	export_database(tasks, tasks_count, DB_CSV_PATH_NAME);
-	fprintf(stderr, done);
-	
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Import database from CSV file.
-	
-	fprintf(stderr, "# import from CSV ----------------------------- \\\n");
-	task_t* task_import = NULL;
-	uint32_t number_of_entries_import = import_database(&task_import, DB_CSV_PATH_NAME);
-	
-	fprintf(stderr, "imported %" PRIu32 " entries.\n", number_of_entries_import);
-	for (uint32_t idx = 0; idx < number_of_entries_import; idx++) {
-		print_task(&task_import[idx]);
-	}
-	free(task_import);
-	fprintf(stderr, done);
-	
-	
-	///////////////////////////////////////////////////////////////////////////
-	// Release memory and exit.
-	
-// 	free(tasks);
-// 	return;
-}
-
-
-char* line_buffer;
-int size_x, size_y;
-uint8_t selected_layout = 0;
-
-#define TABLE_HEADERS_SIZE 9
-
-typedef struct {
-	int table_size;
-	int table_headers_size;
-	char* table_headers[TABLE_HEADERS_SIZE];
-} layout_t;
-
-layout_t* layouts = NULL;
-// 	{
-// 		.table_size = 8,
-// 		.table_headers_size = 9,
-// 		.table_headers = { " Task ", " Mon ", " Tue ", " Wed ", " Thu ", " Fri ", " Sat ", " Sun ", " Total " }
-// 	},
-// 	{
-// 		.table_size = 6,
-// 		.table_headers_size = 9,
-// 		.table_headers = { " T ", " M ", " T ", " W ", " T ", " F ", " S ", " S ", "  #  " }
-// 	}
-// };
-
-void initialize_layouts() {
-	layout_t* layout = NULL;
-	
-	layouts = calloc(2, sizeof(layout_t));
-	
-	// Layout : 0 : normal.
-	layout = &layouts[0];
-	layout->table_size = 8;
-	layout->table_headers_size = TABLE_HEADERS_SIZE;
-	layout->table_headers[0] = " Task ";
-	layout->table_headers[1] = " Mon ";
-	layout->table_headers[2] = " Tue ";
-	layout->table_headers[3] = " Wed ";
-	layout->table_headers[4] = " Thu ";
-	layout->table_headers[5] = " Fri ";
-	layout->table_headers[6] = " Sat ";
-	layout->table_headers[7] = " Sun ";
-	layout->table_headers[8] = " Total ";
-// 	layout->table_headers = { " Task ", " Mon ", " Tue ", " Wed ", " Thu ", " Fri ", " Sat ", " Sun ", " Total " };
-	
-	// Layout : 1 : compact.
-	layout = &layouts[1];
-	layout->table_size = 6;
-	layout->table_headers_size = TABLE_HEADERS_SIZE;
-	layout->table_headers[0] = " Task ";
-	layout->table_headers[1] = " M ";
-	layout->table_headers[2] = " T ";
-	layout->table_headers[3] = " W ";
-	layout->table_headers[4] = " T ";
-	layout->table_headers[5] = " F ";
-	layout->table_headers[6] = " S ";
-	layout->table_headers[7] = " S ";
-	layout->table_headers[8] = "  #  ";
-// 	layout->table_headers = { " T ", " M ", " T ", " W ", " T ", " F ", " S ", " S ", "  #  " };
-}
-
-void free_memory() {
-	free(line_buffer);
-	free(tasks); // TODO Deallocate tasks.
-	free(layouts);
-}
-
-void draw_header() {
-	
-	layout_t* layout = &layouts[selected_layout];
-	int table_size = layout->table_size;
-	char** table_headers = layout->table_headers;
-	
-	mvaddch(0, 0, ACS_ULCORNER);
-	for (int idx = 1; idx < size_x-1; idx++) {
-		addch(ACS_HLINE);
-	}
-	addch(ACS_URCORNER);
-	
-	int start_columns = size_x - 1 - 8*table_size - 2;
-	int columns[] = {
-		0,
-		start_columns+(table_size*0),
-		start_columns+(table_size*1),
-		start_columns+(table_size*2),
-		start_columns+(table_size*3),
-		start_columns+(table_size*4),
-		start_columns+(table_size*5),
-		start_columns+(table_size*6),
-		start_columns+(table_size*7),
-	};
-	
-	mvaddstr(0, columns[0]+2, table_headers[0]);
-	for (int idx = 1; idx < 9; idx++) {
-		mvaddch(0, columns[idx], ACS_TTEE);
-		mvaddstr(0, columns[idx]+2, table_headers[idx]);
-	}
-}
-
-void draw_table() {
-	task_t* task;
-	int x, y;
-	
-	layout_t* layout = &layouts[selected_layout];
-	int table_size = layout->table_size;
-	char** table_headers = layout->table_headers;
-	
-	// TODO Colors
-	start_color();
-	init_pair(1, COLOR_BLACK, COLOR_CYAN);
-	
-	
-	int start_columns = size_x - 1 - 8*table_size - 2;
-	int columns[] = {
-		0,
-		start_columns+(table_size*0),
-		start_columns+(table_size*1),
-		start_columns+(table_size*2),
-		start_columns+(table_size*3),
-		start_columns+(table_size*4),
-		start_columns+(table_size*5),
-		start_columns+(table_size*6),
-		start_columns+(table_size*7),
-		size_x-1,
-	};
-	
-	move(1, 0);
-	for (uint32_t idx = 0; idx < tasks_count; idx++){
-		
-		task = &tasks[idx];
-		
-		// Enable highlight color on selected entry.
-		if (idx == selected_task) {
-			attron(COLOR_PAIR(1));
-		}
-		
-		// Clear line_buffer and add string termination.
-		memset(line_buffer, ' ', size_x * sizeof(char));
-		line_buffer[size_x-1] = '\0';
-		
-		// Check maximum available space for task name and print it accordingly.
-		size_t task_name_length = strlen(task->name)*sizeof(char);
-		size_t max_column_length = start_columns - 2;
-		size_t copy_length = task_name_length < max_column_length ? task_name_length : max_column_length;
-		memcpy(line_buffer+2, task->name, copy_length);
-		addstr(line_buffer);
-
-		// Disable highlight color on selected entry.
-		if (idx == selected_task) {
-			attroff(COLOR_PAIR(1));
-		}
-		
-		// Print columns separators.
-		getyx(stdscr,y,x);
-		for (int c_idx = 0; c_idx < sizeof(columns)/sizeof(int); c_idx++) {
-			mvaddch(y, columns[c_idx], ACS_VLINE);
-		}
-		
-		// Go to next line.
-		y++;
-		move(y, 0);
-	}
-}
-
-void draw_footer() {
-	const char *app_name = "Task Tracker";
-	const char *app_version = "v1.0";
-	
-	int row, col;                        /* to store the number of rows and the number of colums of the screen */
-	initscr();							/* start the curses mode */
-	getmaxyx(stdscr,row,col);			/* get the number of rows and columns */
-	
-	mvaddch(row-1, 0, ACS_LLCORNER);
-	addch(' ');
-	printw(app_name);
-	addch(' ');
-	for (int idx = strlen(app_name) + 3; idx < col - strlen(app_version) - 3; idx ++) {
-		addch(ACS_HLINE);
-	}
-	addch(' ');
-	printw(app_version);
-	addch(' ');
-	addch(ACS_LRCORNER);
-}
-
-WINDOW *create_newwin(int height, int width, int starty, int startx);
-void destroy_win(WINDOW *local_win);
-
-int main(int argc, char *argv[]) {
-	
-	prototype(); // TODO
-	initialize_layouts();
-	
-	WINDOW *my_win;
-	int startx, starty, width, height;
-	int ch;
-
-	initscr();			/* Start curses mode 		*/
-	cbreak();			/* Line buffering disabled, Pass on
-					 * everty thing to me 		*/
-	keypad(stdscr, TRUE);		/* I need that nifty F1 	*/
-    curs_set(0);        // Set cursor invisible.
-
-	height = 3;
-	width = 10;
-	starty = (LINES - height) / 2;	/* Calculating for a center placement */
-	startx = (COLS - width) / 2;	/* of the window		*/
-	printw("Press F1 to exit");
-	refresh();
-	my_win = create_newwin(height, width, starty, startx);
-    
-	int rows;
-	int colums;
-	
-	ch = KEY_RESIZE;
-	do {
-        switch(ch)
-		{
-			case KEY_RESIZE:
-				erase();
-				if (line_buffer != NULL) {
-					free(line_buffer);
-				}
-				getmaxyx(stdscr, size_y, size_x);
-				line_buffer = malloc(size_x * sizeof(char));
-				break;
-			
-			case KEY_LEFT:
-				destroy_win(my_win);
-				my_win = create_newwin(height, width, starty,--startx);
-				break;
-			
-			case KEY_RIGHT:
-				destroy_win(my_win);
-				my_win = create_newwin(height, width, starty,++startx);
-				break;
-			
-			case KEY_UP:
-				selected_task = selected_task == 0 ? 0 : selected_task - 1;
-				destroy_win(my_win);
-				my_win = create_newwin(height, width, --starty,startx);
-				break;
-			
-			case KEY_DOWN:
-				selected_task = (selected_task+1) == tasks_count ? selected_task : selected_task + 1;
-				destroy_win(my_win);
-				my_win = create_newwin(height, width, ++starty,startx);
-				break;	
-		}
-		
-		selected_layout = size_x > 100 ? 0 : 1;
-
-		if (size_x >= 60 && size_y > 2) {
-			draw_header();
-			draw_table();
-			draw_footer();
-		}
-		else {
-			const char* INVALID_WINDOW_MESSAGE = "Please expand window.";
-			mvaddstr(size_y / 2, (size_x - strlen(INVALID_WINDOW_MESSAGE)) / 2, INVALID_WINDOW_MESSAGE);
-		}
-	
-	} while((ch = getch()) != KEY_F(1));
-	
-	free_memory();
-	endwin();
-	return 0;
-}
-
-WINDOW *create_newwin(int height, int width, int starty, int startx) {
-	WINDOW *local_win;
-
-	local_win = newwin(height, width, starty, startx);
-	box(local_win, 0 , 0);		/* 0, 0 gives default characters 
-					 * for the vertical and horizontal
-					 * lines			*/
-	wrefresh(local_win);		/* Show that box 		*/
-
-	return local_win;
-}
-
-void destroy_win(WINDOW *local_win) {
-	/* box(local_win, ' ', ' '); : This won't produce the desired
-	 * result of erasing the window. It will leave it's four corners 
-	 * and so an ugly remnant of window. 
-	 */
-	wborder(local_win, ' ', ' ', ' ',' ',' ',' ',' ',' ');
-	/* The parameters taken are 
-	 * 1. win: the window on which to operate
-	 * 2. ls: character to be used for the left side of the window 
-	 * 3. rs: character to be used for the right side of the window 
-	 * 4. ts: character to be used for the top side of the window 
-	 * 5. bs: character to be used for the bottom side of the window 
-	 * 6. tl: character to be used for the top left corner of the window 
-	 * 7. tr: character to be used for the top right corner of the window 
-	 * 8. bl: character to be used for the bottom left corner of the window 
-	 * 9. br: character to be used for the bottom right corner of the window
-	 */
-	wrefresh(local_win);
-	delwin(local_win);
-}