Keyboard Converter for 5 Keys
(1) Fetch keyboard input sequence
(2) Normalize key seqeunce so that only key "1" ~ "5" is taken
(3) Decode key and process
(4) Output
/**************************************************************/
/* bobo */
/* 20230211 */
/* Keyboard Converter for 5-Key Keyboard */
/**************************************************************/
#include <stdio.h>
/* Defines */
#define SIZE_KEY_SEQUENCE 100
#define SIZE_CLIP_BOARD 100
#define SIZE_SCREEN 100
#define STATUS_VERSION VERSION_NORMAL
#define VERSION_DEBUG 0
#define VERSION_NORMAL 1
#define FLAG_INCOMPLETE 0
#define FLAG_COMPLETE 1
#define FLAG_ERROR 2
/* Structures */
/* Function Prototypes*/
int key_sequence_normalize(char*, char*, int);
int key_sequence_decode(char*, char*, char*, int);
int screen_count(char*, int);
/* Globals */
/* To-do List*/
/*
* (1) structural program that can run
* (2) implementation
* (3) standarized input / output
* (4) error detction and process
*/
int main()
{
/* Explore the C World */
/* Variables */
char in_char_key_sequence[SIZE_KEY_SEQUENCE] = { 0 };
char inter_char_clipboard[SIZE_CLIP_BOARD] = { 0 };
char inter_char_screen[SIZE_SCREEN] = { 0 };
char inter_char_key_sequence_std[SIZE_KEY_SEQUENCE] = { 0 };
int out_int_num = 0, out_int_size_word_sys = 0;
/* Input Interface Selection */
#if(STATUS_VERSION == VERSION_DEBUG)
/* Welcoming Information */
printf("Welcome to 5-Key Keyboard Conversion Porgam! \n");
/* System Information */
out_int_size_word_sys = sizeof(int);
printf("Word Length of Integer Type of Current System is: %lu \n", out_int_size_word_sys);
#elif(STATUS_VERSION == VERSION_NORMAL)
/* Standard Input */
#endif
/* Step 01. Fetch Input */
fgets(in_char_key_sequence, SIZE_KEY_SEQUENCE, stdin);
/* Step 02. Process */
key_sequence_normalize(inter_char_key_sequence_std, in_char_key_sequence, SIZE_KEY_SEQUENCE);
key_sequence_decode(inter_char_clipboard, inter_char_screen, inter_char_key_sequence_std, \
SIZE_KEY_SEQUENCE);
out_int_num = screen_count(inter_char_screen, SIZE_KEY_SEQUENCE);
/* Step 03. Drive Output */
/* Output Interface Selection */
#if(STATUS_VERSION == VERSION_DEBUG)
printf("Number of Characters is: %d", out_int_num);
#elif(STATUS_VERSION == VERSION_NORMAL)
/*
* puts(inter_char_key_sequence_std);
* puts(inter_char_screen);
* puts(inter_char_clipboard);
*/
printf("%d \n", out_int_num);
#endif
/* Return */
return 0;
}
int key_sequence_normalize(char* out_sequence, char* in_seqeunce, int in_num_valid)
{
/* You should know that a space will not be taken */
/* Variables */
int index_key_in = 0;
int index_key_out = 0;
/* func 01 step 01. look for correct keys */
for (index_key_in = 0; index_key_in < in_num_valid; index_key_in++) {
if (in_seqeunce[index_key_in] > '0' && in_seqeunce[index_key_in] < '6') {
out_sequence[index_key_out] = in_seqeunce[index_key_in];
index_key_out++;
}
}
return FLAG_COMPLETE;
}
int key_sequence_decode(char* out_clipboard, char* out_screen, char* in_key_sequence, \
int in_num_valid)
{
/* Decode normalized key sequence, that is continuous number (1 ~ 5) string */
/* This function has no external storage, that is it starts over from the
* beginning every time it is called
*/
/* Variables */
int index_key = 0, key_current = 0, ptr_clipboard = 0, ptr_screen = 0;
int index_char = 0, index_char_2 = 0, num_sel = 0, num_ins = 0, num_rem = 0, num_ext = 0;
int ptr_screen_sel_stt = 0, ptr_screen_sel_stp = 0, ptr_screen_sel_swap = 0;
/* func 02 step 01. iterate key elements */
for (index_key = 0; index_key < in_num_valid; index_key++) {
/* Determine number of selected characters */
if (ptr_screen_sel_stp < ptr_screen_sel_stt) {
ptr_screen_sel_swap = ptr_screen_sel_stt;
ptr_screen_sel_stt = ptr_screen_sel_stp;
ptr_screen_sel_stp = ptr_screen_sel_swap;
}
else {
/* Do nothing */
}
num_sel = ptr_screen_sel_stp - ptr_screen_sel_stt;
/* Decode */
switch (in_key_sequence[index_key]) {
case '1':
/* Output character "a" to the screen */
key_current = 1;
/* Process */
if (num_sel > 0) {
/* Clear */
for (index_char = 0; index_char < num_sel; index_char++) {
out_screen[ptr_screen_sel_stt + index_char] = '\0';
}
/* Insert */
num_ins = 1;
out_screen[ptr_screen_sel_stt] = 'a';
/* Move */
num_rem = ptr_screen - ptr_screen_sel_stp;
for (index_char = 0; index_char < num_rem; index_char++) {
out_screen[ptr_screen_sel_stt + num_ins + index_char] = out_screen\
[ptr_screen_sel_stp + index_char];
out_screen[ptr_screen_sel_stp + index_char] = '\0';
}
ptr_screen = ptr_screen - num_sel + num_ins;
/* Cancel selection */
ptr_screen_sel_stt = 0;
ptr_screen_sel_stp = 0;
}
else {
/* Add character at the end of the screen */
out_screen[ptr_screen] = 'a';
ptr_screen++;
}
break;
case '2':
/* Copy */
key_current = 2;
if (num_sel > 0) {
/* Clear previous clipboard content */
for (index_char = 0; index_char < ptr_clipboard; index_char++) {
out_clipboard[index_char] = '\0';
}
ptr_clipboard = 0;
/* Add new clipboard content */
for (index_char = 0; index_char < num_sel; index_char++) {
out_clipboard[index_char] = out_screen[ptr_screen_sel_stt + index_char];
ptr_clipboard++;
}
}
else {
/* Do nothing */
}
break;
case '3':
/* Cut */
key_current = 3;
if (num_sel > 0) {
/* Clear previous clipboard content */
for (index_char = 0; index_char < ptr_clipboard; index_char++) {
out_clipboard[index_char] = '\0';
}
ptr_clipboard = 0;
/* Add new clipboard content */
for (index_char = 0; index_char < num_sel; index_char++) {
out_clipboard[index_char] = out_screen[ptr_screen_sel_stt + index_char];
out_screen[ptr_screen_sel_stt + index_char] = '\0';
ptr_clipboard++;
ptr_screen--;
}
/* Cancel selection */
ptr_screen_sel_stt = 0;
ptr_screen_sel_stp = 0;
}
else {
/* Do nothing */
}
break;
case '4':
/* Paste */
key_current = 4;
/* Clear characters currently selected */
if (num_sel > 0) {
/* Clear */
for (index_char = 0; index_char < num_sel; index_char++) {
out_screen[ptr_screen_sel_stt + index_char] = '\0';
}
/* Insert and move */
num_ins = ptr_clipboard;
num_rem = ptr_screen - ptr_screen_sel_stp;
if (num_ins <= num_sel) {
/* Inserted no longer than deleted */
for (index_char = 0; index_char < num_ins; index_char++) {
out_screen[ptr_screen_sel_stt + index_char] = out_clipboard[index_char];
}
for (index_char = 0; index_char < num_rem; index_char++) {
out_screen[ptr_screen_sel_stt + num_ins + index_char] = out_screen\
[ptr_screen_sel_stp + index_char];
ptr_screen--;
}
}
else {
/* Insterted longer than deleted */
num_ext = num_ins - num_sel;
for (index_char = 0; index_char < num_sel; index_char++) {
out_screen[ptr_screen_sel_stt + index_char] = out_clipboard[index_char];
}
for (index_char = 0; index_char < num_ext; index_char++) {
for (index_char_2 = 0; index_char_2 < num_rem; index_char_2++) {
out_screen[ptr_screen - index_char_2] = out_screen[ptr_screen - \
index_char_2 - 1];
}
ptr_screen++;
out_screen[ptr_screen_sel_stp + index_char] = out_clipboard[num_sel + \
index_char];
}
}
/* Cancel selection */
ptr_screen_sel_stt = 0;
ptr_screen_sel_stp = 0;
}
else {
/* Add characters at the end of screen */
for (index_char = 0; index_char < ptr_clipboard; index_char++) {
out_screen[ptr_screen] = out_clipboard[index_char];
ptr_screen++;
}
}
break;
case '5':
/* Select all */
key_current = 5;
ptr_screen_sel_stt = 0;
ptr_screen_sel_stp = ptr_screen;
break;
default:
break;
}
}
return FLAG_COMPLETE;
}
int screen_count(char* in_screen, int in_num_valid)
{
/* Count numbers of characters on screen */
/* Variables */
int index_screen = 0;
int out_num = 0;
/* Count */
for (index_screen = 0; index_screen < in_num_valid; index_screen++) {
if (in_screen[index_screen] == 'a') {
out_num++;
}
else {
/* Do nothing */
}
}
return out_num;
}
/* End of File */
