[HOLD] http: use ENOSPC instead of ERANGE to signal 507 errors

[Eric Wong <e@80x24.org>]

It makes a bit more sense this way for returning 507 errors,
since we may also be using ERANGE for the next commit.

In retrospect, relying on errno like this probably wasn't a great
idea and future changes may clean this up.
---
 chunk_parser.rl | 2 +-
 http.c          | 2 +-
 http_parser.rl  | 2 +-
 http_put.c      | 5 ++---
 4 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/chunk_parser.rl b/chunk_parser.rl
index 0eb2e22..f482444 100644
--- a/chunk_parser.rl
+++ b/chunk_parser.rl
@@ -82,7 +82,7 @@ static inline off_t hexchar2off(int xdigit)
 			http->_p.content_len *= 16;
 			http->_p.content_len += hexchar2off(fc);
 			if (http->_p.content_len < prev) {
-				errno = ERANGE;
+				errno = ENOSPC;
 				http->_p.content_len = -1;
 				fbreak;
 			}
diff --git a/http.c b/http.c
index 1914d18..316b2d1 100644
--- a/http.c
+++ b/http.c
@@ -342,7 +342,7 @@ parse:
 	assert(0 && "compiler bug?");
 
 err507or400:
-	if (errno == ERANGE) {
+	if (errno == ENOSPC) {
 		mog_http_resp(mfd, "507 Insufficient Storage", false);
 	} else {
 err400:
diff --git a/http_parser.rl b/http_parser.rl
index 8e82828..fdfbd97 100644
--- a/http_parser.rl
+++ b/http_parser.rl
@@ -15,7 +15,7 @@ static bool length_incr(off_t *len, unsigned c)
 	if (*len >= prev)
 		return true;
 
-	errno = ERANGE;
+	errno = ENOSPC;
 	*len = -1;
 
 	return false;
diff --git a/http_put.c b/http_put.c
index 3334d56..6055572 100644
--- a/http_put.c
+++ b/http_put.c
@@ -97,7 +97,6 @@ MOG_NOINLINE static enum mog_next
 write_err(struct mog_fd *mfd, const char *default_msg)
 {
 	switch (errno) {
-	case ERANGE:
 	case ENOSPC:
 	case EFBIG:
 		return stop(mfd, "507 Insufficient Storage");
@@ -263,14 +262,14 @@ identity_body_after_header(struct mog_fd *mfd, char *buf, size_t buf_len)
 static bool lengths_ok(struct mog_http *http)
 {
 	if (http->_p.content_len < 0)
-		return false;	/* ERANGE */
+		return false;	/* ENOSPC */
 
 	if (http->_p.has_content_range) {
 		if (http->_p.chunked)
 			return false;
 
 		if (http->_p.range_end < 0 || http->_p.range_beg < 0)
-			return false;	/* ERANGE */
+			return false;	/* ENOSPC */
 
 		assert(http->_p.range_end >= 0 && http->_p.range_beg >= 0 &&
 		       "bad range, http_parser.rl broken");
-- 
EW