1 /*
2  * 3-2. Write a function escape(s,t) that converts characters like newline
3  * and tab into visible escape sequences like \n and \t as it copies the
4  * string t to s. Use a switch. Write a function for the other direction as
5  * well, converting escape sequences into the real characters.
6  */
7 
8 #include <stdio.h>
9 
10 void escape(char s[], char t[]);
11 
12 main()
13 {
14 	char str[400];
15 	escape (str, "This\t\t\t is a test\n to see\n\t\t if escaping works");
16 	printf("%s\n", str);
17 }
18 
19 void escape(char s[], char t[]) {
20 	int i, j;
21 	for (i = 0, j = 0; t[j] != '\0'; ++i, ++j) {
22 		switch (t[j]) {
23 			case '\t':
24 				s[i++] = '\\';
25 				s[i] = 't';
26 				break;
27 			case '\n':
28 				s[i++] = '\\';
29 				s[i] = 'n';
30 				break;
31 			default:
32 				s[i] = t[j];
33 				break;
34 		}
35 	}
36 	s[i] = t[j];
37 }