C－Escape(s,t): Convert characters into visible escape sequences as it copies the string t to s

今天药忘吃喽~ 2022-11-01 01:35 16阅读 0赞

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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'"!
    
    
    */

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