three/escape.c


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#include <stdio.h>

void
ctoe()
{
	int c;
	while ((c = getchar()) != EOF) {
		if (c == '\\') {
			c = getchar();
			switch(c) {
			case 'n':
				putchar('\n');
				break;
			case 't':
				putchar('\t');
				break;
			default:
				putchar(c);
				break;
			}
		} else {
			putchar(c);
		}
	}
}

void
etoc()
{
	int c;
	while ((c = getchar()) != EOF) {
		switch(c) {
		case '\n':
			putchar('\\');
			putchar('n');
			break;
		case '\t':
			putchar('\\');
			putchar('t');
			break;
		default:
			putchar(c);
			break;
		}
	}
}

int
main()
{
	etoc();
	return 0;
}