urlencode.c


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/* Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net> */
#include <stdio.h>

int
main () {
	int c;
	while ((c = getchar()) != EOF) {
		if (('0' <= c && c <= '9')
		 || ('A' <= c && c <= 'Z')
		 || ('a' <= c && c <= 'z')
		){
			putchar(c);
		} else if (c == ' ') {
			putchar('+');
		} else {
			printf("%%%02X", c);
		}
	}
	return 0;
}