GopherProxy

	Encode characters for 'q' parameter to get passed and parsed correctly - gopher…
	git clone git://git.codemadness.org/gopherproxy-c
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	---
	commit e96ccc93928250ede30995cff7bf0e11758b2602
	parent 21855e485f7a47b90546f9039fec6a4b4f382567
	Author: Julian Schweinsberg <[email protected]>
	Date: Wed, 13 Nov 2024 18:41:56 +0000

	Encode characters for 'q' parameter to get passed and parsed correctly

	Without encoding the characters '&' and '=' they would be interpreted by
	getparam(), this is not correct because these characters are part of the
	selector of the gopher URI and shouldn't be interpreted by the
	gopherproxy but the gopher server.

	Additionally '#' gets escaped or it wouldn't be passed to the
	gopherproxy and by this not to the gopher server.

	The additional characters get URL escaped, so that no xmlenode is
	needed.

	For the character '&' gopher://gopherddit.com/1 is a good test case.

	Diffstat:
	M gopherproxy.c \| 26 +++++++++++++++++++++++++-

	1 file changed, 25 insertions(+), 1 deletion(-)
	---
	diff --git a/gopherproxy.c b/gopherproxy.c
	@@ -91,6 +91,30 @@ xmlencode(const char *s)
	}
	}

	+/* Percent-encode characters so that the string can be used as a value for a
	+ query string.
	+ Additional characters get encoded so that no xmlencode() is needed */
	+void
	+encodeparam(const char *s)
	+{
	+ for (; *s; s++) {
	+ switch (*s) {
	+ case '<':
	+ case '>':
	+ case '\'':
	+ case '&':
	+ case '"':
	+ case '#':
	+ case '=':
	+ printf("%%%02X", (unsigned char)*s);
	+ break;
	+ default:
	+ putchar(*s);
	+ break;
	+ }
	+ }
	+}
	+
	int
	edial(const char host, const char port)
	{
	@@ -371,7 +395,7 @@ servedir(const char server, const char port, const char *…
	xmlencode(v.path + sizeof("URL:") - 1);
	} else {
	fputs("?q=", stdout);
	- xmlencode(uri);
	+ encodeparam(uri);
	}
	fputs("\">", stdout);
	xmlencode(v.username);