C－Escape（s、t）：文字列tをsにコピーするときに、文字を表示可能なエスケープシーケンスに変換します

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/*
 * Write a function Escape(s,t) that converts characters like newline and tab into
 * visible escape sequences like \n and \t as it copies the string t to s.
 * Write a function for the other direction as well, converting escape sequences
 * into the real characters.
 *
 * Escape.c - by FreeMan
 */

#include <stdio.h>

void Escape(char *s, char *t);
void Unescape(char *s, char *t);

int main(void)
{
	char s[50] = "\aHello,\n\tWorld! Mistakee\b was \"Extra 'e'\"!\n";
	char t[51];
	printf("Original string:\n%s\n", s);

	Escape(t, s);
	printf("Escaped string:\n%s\n", t);

	Unescape(s, t);
	printf("Unescaped string:\n%s\n", s);

	return 0;
}

void Escape(char *s, char *t)
{
	int i, j;
	i = j = 0;
	while (t[i])
	{
		/* Translate the special character, if we have one */
		switch (t[i])
		{
		case '\n':
			s[j++] = '\\';
			s[j] = 'n';
			break;
		case '\t':
			s[j++] = '\\';
			s[j] = 't';
			break;
		case '\a':
			s[j++] = '\\';
			s[j] = 'a';
			break;
		case '\b':
			s[j++] = '\\';
			s[j] = 'b';
			break;
		case '\f':
			s[j++] = '\\';
			s[j] = 'f';
			break;
		case '\r':
			s[j++] = '\\';
			s[j] = 'r';
			break;
		case '\v':
			s[j++] = '\\';
			s[j] = 'v';
			break;
		case '\\':
			s[j++] = '\\';
			s[j] = '\\';
			break;
		case '\"':
			s[j++] = '\\';
			s[j] = '\"';
			break;
		default:
			/* This is not a special character, so just copy it */
			s[j] = t[i];
			break;
		}
		++i;
		++j;
	}
	s[j] = t[i]; /* Don't forget the null character */
}

void Unescape(char *s, char *t) {
	int i, j;
	i = j = 0;
	while (t[i]) {
		switch (t[i]) {
		case '\\':
			/* We've found an escape sequence, so translate it */
			switch (t[++i]) {
			case 'n':
				s[j] = '\n';
				break;
			case 't':
				s[j] = '\t';
				break;
			case 'a':
				s[j] = '\a';
				break;
			case 'b':
				s[j] = '\b';
				break;
			case 'f':
				s[j] = '\f';
				break;
			case 'r':
				s[j] = '\r';
				break;
			case 'v':
				s[j] = '\v';
				break;
			case '\\':
				s[j] = '\\';
				break;
			case '\"':
				s[j] = '\"';
				break;
			default:
				/* We don't translate this escape sequence, so just copy it verbatim */
				s[j++] = '\\';
				s[j] = t[i];
			}
			break;
		default:
			/* Not an escape sequence, so just copy the character */
			s[j] = t[i];
		}
		++i;
		++j;
	}
	s[j] = t[i]; /* Don't forget the null character */
}

// Output:
/*
Original string:
Hello,
		World! Mistake was "Extra 'e'"!

Escaped string:
\aHello,\n\tWorld! Mistakee\b was \"Extra 'e'\"!\n
Unescaped string:
Hello,
		World! Mistake was "Extra 'e'"!


*/