Exercise 3.02

Page 60

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. Use a switch. Write a function for the other direction as well, converting escape sequences into the real characters.

#include <stdio.h>

#define LEN 100

void escape(char t[], char s[]);

int main()
{
	char out[LEN];
	escape("This is an example of a newline:\n, and this is an example of a tab:\t",
	       out);
	printf("%s\n", out);
}

void escape(char t[], char s[])
{
	int i = 0;
	char c;
	while ((c = t[i]) != '\0') {
		switch (c) {
		case '\n':
			s[i++] = '\\';
			s[i++] = 'n';
			break;
		case '\t':
			s[i++] = '\\';
			s[i++] = 't';
			break;
		default:
			s[i++] = c;
		}
	}
}