normalize host name when parsing the IRI

RFC3986 3.2.2 "Host" says that

> Although host is case-insensitive, producers and normalizers should
> use lowercase for registered names and hexadecimal addresses for the
> sake of uniformity, while only using uppercase letters for
> percent-encodings.

so we cope with that.

2 files changed, 9 insertions, 1 deletions

diff --git a/iri.c b/iri.c
index 1b997dd..d64afe8 100644
--- a/iri.c
+++ b/iri.c
@@ -146,8 +146,12 @@ parse_authority(struct parser *p)
 
 	while (unreserved(*p->iri)
 	    || sub_delimiters(*p->iri)
-	    || parse_pct_encoded(p))
+	    || parse_pct_encoded(p)) {
+		/* normalize the host name. */
+		if (*p->iri < 0x7F)
+			*p->iri = tolower(*p->iri);
 		p->iri++;
+	}
 
 	if (p->err != NULL)
 		return 0;
diff --git a/iri_test.c b/iri_test.c
index e322813..81ec0b4 100644
--- a/iri_test.c
+++ b/iri_test.c
@@ -123,6 +123,10 @@ main(void)
 	    FAIL,
 	    empty,
 	    "FAIL with invalid port number");
+	TEST("gemini://OmArPoLo.CoM",
+	    PASS,
+	    IRI("gemini", "omarpolo.com", "", "", "", ""),
+	    "host is case-insensitive");
 
 	/* path */
 	TEST("gemini://omarpolo.com/foo/bar/baz",