Sha256: 9e18b03f5972ce1ea9b2bdb0f836d878874274862ceefade8249f18b1ec1755b
Contents?: true
Size: 1.55 KB
Versions: 119
Compression:
Stored size: 1.55 KB
Contents
#include "atbash_cipher.h"
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdbool.h>
#define GROUP_SIZE (5)
static void remove_trailing_space(char *string)
{
if (string[strlen(string) - 1] == ' ') {
string[strlen(string) - 1] = '\0';
}
}
static bool is_valid_character(char character)
{
return isalpha(character) || isdigit(character);
}
static char get_encoded_character(char character)
{
return (isdigit(character) ? character : 'z' - (character - 'a'));
}
static char get_decoded_character(char character)
{
return (isdigit(character) ? character : 'a' + ('z' - character));
}
char *atbash_encode(const char *input)
{
char *output = malloc(strlen(input) + (strlen(input) / GROUP_SIZE));
int group_count = 0;
output[0] = '\0';
for (size_t i = 0; i < strlen(input); i++) {
if (is_valid_character(tolower(input[i]))) {
char encoded_character = get_encoded_character(tolower(input[i]));
strncat(output, &encoded_character, 1);
if (++group_count == GROUP_SIZE) {
strcat(output, " ");
group_count = 0;
}
}
}
remove_trailing_space(output);
return output;
}
char *atbash_decode(const char *input)
{
char *output = malloc(strlen(input) + (strlen(input) / GROUP_SIZE));
output[0] = '\0';
for (size_t i = 0; i < strlen(input); i++) {
if (is_valid_character(input[i])) {
char decoded_character = get_decoded_character(input[i]);
strncat(output, &decoded_character, 1);
}
}
return output;
}
Version data entries
119 entries across 119 versions & 1 rubygems