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101 lines
3.5 KiB
101 lines
3.5 KiB
// add test to check mirroring
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#include "morse.h"
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <limits.h>
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#include <stdlib.h>
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#define NUM_OF_SYMBOLS 82
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#define MAX_MORSE_LENGTH 9
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static char SYMBOLS[NUM_OF_SYMBOLS] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'.', ',', '?', '\'', '!', '/', '(', ')', '&', ':', ';', '=', '+', '-', '_', '"', '$', '@',
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' '};
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static char SYMBOL_ERROR = '~';
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static char MORSE[NUM_OF_SYMBOLS][MAX_MORSE_LENGTH] = {
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// A-Z
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".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--..",
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// a-z (same as above, but needed twice due to design choices)
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".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--..",
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// 0-9
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"-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----.",
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// . , ? ' ! / ( ) & : ; = + - _ " $ @ EOF
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".-.-.-", "--..--", "..--..", ".----.", "-.-.--", "-..-.", "-.--.", "-.--.-", ".-...", "---...", "-.-.-.", "-...-", ".-.-.", "-...-", "..--.-", ".-..-.", "...-..-", ".--.-.",
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// space
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"/"};
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static char* MORSE_ERROR = "........";
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// This function returns a pointer to the morse code written above.
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// The genuis of this function feels amazing because I've never used C before, but I see why
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// ... it's used for performence!
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//
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// I do not copy ANY data. The pointer returned points to the above array!
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void char_to_morse(char letter, char* result) {
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bool found = false;
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for (int i = 0; i < NUM_OF_SYMBOLS; i++) {
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if (letter == SYMBOLS[i]) {
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strcpy(result, MORSE[i]);
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found = true;
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}
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}
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if (!found) {
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strcpy(result, MORSE_ERROR);
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}
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}
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void string_to_morse(char* string, char* result){
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int on_char = 0;
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int string_len = strlen(string);
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char morse[MAX_MORSE_LENGTH] = "";
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// worse possible case is 8 times the length (assuming all numbers/punctuation, and adding spaces)
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// +1 for NULL terminator
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for (int i = 0; i < string_len; i++){
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char_to_morse(string[i], morse);
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int morse_len = strlen(morse);
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memcpy(result+on_char, morse, morse_len);
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on_char += morse_len;
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if (i != string_len-1){
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memcpy(result+on_char, " ", 1);
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on_char++;
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}
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}
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result[on_char] = '\0';
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}
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char morse_to_char(const char* morse) {
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for (int i = 0; i < NUM_OF_SYMBOLS; i++) {
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if (strcmp(morse, MORSE[i]) == 0) {
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return SYMBOLS[i];
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}
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}
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return SYMBOL_ERROR;
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}
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void morse_to_string(const char* morse_to_cpy, char* result) {
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int on_char = 0;
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char* morse = malloc(sizeof(char) * strlen(morse_to_cpy)+1);
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strcpy(morse, morse_to_cpy);
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// split by the space character
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char* morse_ptr = strtok(morse, " \n");
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// until we reach the end of the string
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while (morse_ptr != NULL) {
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char char_to_add = morse_to_char(morse_ptr);
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// give the address of the single character to concatinate to result
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result[on_char++] = char_to_add;
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// reset the morse ptr for the next section between a space
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morse_ptr = strtok(NULL, " \n");
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}
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free(morse);
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// add null terminator, necessary in C strings
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result[on_char] = '\0';
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}
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