[PATCH] Make buf_append_urlencoded() percent-encode fewer characters.

[Dan Lenski]

From: Daniel Lenski <dlenski at gmail.com>

Per RFC 3986, the characters '-', '_', '.', '~' don't need to be
percent-encoded anywhere in a URL or query string.

Removed special case for ' ' → '+' to prevent incompatibility with ocserv:
http://lists.infradead.org/pipermail/openconnect-devel/2016-October/004042.html

		/* else if (c==' ')
			buf_append_bytes(buf, "+", 1); */

Signed-off-by: Dan Lenski <dlenski at gmail.com>
---
 http.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/http.c b/http.c
index 1b99319..db7af10 100644
--- a/http.c
+++ b/http.c
@@ -45,7 +45,7 @@ void buf_append_urlencoded(struct oc_text_buf *buf, const char *str)
 {
 	while (str && *str) {
 		unsigned char c = *str;
-		if (c < 0x80 && isalnum((int)(c)))
+		if (c < 0x80 && (isalnum((int)(c)) || c=='-' || c=='_' || c=='.' || c=='~'))
 			buf_append_bytes(buf, str, 1);
 		else
 			buf_append(buf, "%%%02x", c);
-- 
2.9.3