Another pull from my growing-towards-beta CGI library: sgcgi_url_unescape().

Note the use strcpy, which is faster than the equivalent memmove()ing. To ensure 64-bit safety, I plan to rename this function and then conditionally compile it to point to either strcpy or a 64-bit-safe memmove() implementation of strcpy.

However, even though copy order isn't guaranteed for strcpy, on 16-bit and 32-bit systems, all known implementations copy byte-by-byte from lower addresses to higher addresses. Some 64-bit optimized compilers may copy 8-byte chunks, making the assumption of full linearity unstable at best.

I know it sounds like I'm justifying use of nonstandard code for convenience . . . *blush* . . . it's just something that putting in a -DPEDANTIC type of preprocessor flag could fix if broken, and its SO much faster!

(Supported by JavaScript, maybe other languages)

Functions for validating, parsing, and normalizing URIs and their parts.
If you find any errors, please leave a comment.

parseURI(str) splits a URI into its parts
parseQueryNumeric(str) splits a query string into its name/value pairs; returns a 2-D array
parseQueryAssociative(str) splits a query string into its name/value pairs; returns an associative array
parseURL(str) splits a URL (i.e., http(s) scheme URI) into its parts
normalizeURLDomain(domain) converts an obscured URL domain to a more readable one
normalizeIPv4(ip) normalizes an IPv4 address
normalizeIPv6(ip) normalizes an IPv6 address
normalizeURLPath(path) converts an obscured URL path to a more readable one
parseMailto(str) splits a mailto scheme URI into its parts
normalizeEmailAddress(str) converts an obscured email address to a more readable one; unfolds and removes comments
fixURL(str, domain) attempts to fix a URL if needed
fixHyperlink(str, domain, allowMailto) attempts to fix a hyperlink address (http(s) or mailto) if needed

For URLs, note that IPvFuture addresses are not supported.