function do wrong on all input bytes that are >= 0x80 (decimal 128) due to a
signed / unsigned mistake in the code. I fixed it and added test case 543 to
verify.

non-ASCII systems.

could very well cause a negate number get passed in and thus cause reading
outside of the array usually used for this purpose.

We avoid this by using the uppercase macro versions introduced just now that
does some extra crazy typecasts to avoid byte codes > 127 to cause negative
int values.

precaution to prevent mistakes to lead to buffer overflows.

memory.h is included everywhere for this.

warnings. Minor edits by me.

we unescape a string. We now check and decode only valid %XX strings.

way for emacs, and vim users should provide a similar non-polluting style

not to re-encode it).

encoded letter (in curl_escape)

-Wall and a new gcc

used