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/*
* upas/unesc - interpret =?foo?bar?=char?= escapes
*/
#include <stdio.h>
#include <stdlib.h>
int
hex(int c)
{
if('0' <= c && c <= '9')
return c - '0';
if('A' <= c && c <= 'F')
return c - 'A' + 10;
if('a' <= c && c <= 'f')
return c - 'a' + 10;
return 0;
}
int
main(int argc, char **argv)
{
int c;
while((c=getchar()) != EOF){
if(c == '='){
if((c=getchar()) == '?'){
while((c=getchar()) != EOF && c != '?')
continue;
while((c=getchar()) != EOF && c != '?')
continue;
while((c=getchar()) != EOF && c != '?'){
if(c == '='){
c = hex(getchar()) << 4;
c |= hex(getchar());
}
putchar(c);
}
(void) getchar(); /* consume '=' */
}else{
putchar('=');
putchar(c);
}
}else
putchar(c);
}
exit(0);
}
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