MEDIUM: htx: Change htx_sl to be a struct instead of an union

The HTX start-line is now a struct. It will be easier to extend, if needed. Same
info can be found, of course. In addition it is now possible to set flags on
it. It will be used to set some infos about the message.

Some macros and functions have been added in proto/htx.h to help accessing
different parts of the start-line.
diff --git a/src/htx.c b/src/htx.c
index 0c96467..85118cf 100644
--- a/src/htx.c
+++ b/src/htx.c
@@ -573,35 +573,35 @@
 
 static void htx_set_blk_reqline(struct htx *htx, struct htx_blk *blk, const union h1_sl sl)
 {
-	union htx_sl *htx_sl;
+	struct htx_sl *htx_sl;
 
 	htx_sl = htx_get_blk_ptr(htx, blk);
-	htx_sl->rq.meth = sl.rq.meth;
+	htx_sl->info.req.meth = sl.rq.meth;
 
-	htx_sl->rq.m_len = sl.rq.m.len;
-	htx_sl->rq.u_len = sl.rq.u.len;
-	htx_sl->rq.v_len = sl.rq.v.len;
+	HTX_SL_REQ_MLEN(htx_sl) = sl.rq.m.len;
+	HTX_SL_REQ_ULEN(htx_sl) = sl.rq.u.len;
+	HTX_SL_REQ_VLEN(htx_sl) = sl.rq.v.len;
 
-	memcpy(htx_sl->rq.l,                             sl.rq.m.ptr, sl.rq.m.len);
-	memcpy(htx_sl->rq.l + sl.rq.m.len,               sl.rq.u.ptr, sl.rq.u.len);
-	memcpy(htx_sl->rq.l + sl.rq.m.len + sl.rq.u.len, sl.rq.v.ptr, sl.rq.v.len);
+	memcpy(HTX_SL_REQ_MPTR(htx_sl), sl.rq.m.ptr, sl.rq.m.len);
+	memcpy(HTX_SL_REQ_UPTR(htx_sl), sl.rq.u.ptr, sl.rq.u.len);
+	memcpy(HTX_SL_REQ_VPTR(htx_sl), sl.rq.v.ptr, sl.rq.v.len);
 }
 
 
 static void htx_set_blk_resline(struct htx *htx, struct htx_blk *blk, const union h1_sl sl)
 {
-	union htx_sl *htx_sl;
+	struct htx_sl *htx_sl;
 
 	htx_sl = htx_get_blk_ptr(htx, blk);
-	htx_sl->st.status = sl.st.status;
+	htx_sl->info.res.status = sl.st.status;
 
-	htx_sl->st.v_len = sl.st.v.len;
-	htx_sl->st.c_len = sl.st.c.len;
-	htx_sl->st.r_len = sl.st.r.len;
+	HTX_SL_RES_VLEN(htx_sl) = sl.st.v.len;
+	HTX_SL_RES_CLEN(htx_sl) = sl.st.c.len;
+	HTX_SL_RES_RLEN(htx_sl) = sl.st.r.len;
 
-	memcpy(htx_sl->st.l,                             sl.st.v.ptr, sl.st.v.len);
-	memcpy(htx_sl->st.l + sl.st.v.len,               sl.st.c.ptr, sl.st.c.len);
-	memcpy(htx_sl->st.l + sl.st.v.len + sl.st.c.len, sl.st.r.ptr, sl.st.r.len);
+	memcpy(HTX_SL_RES_VPTR(htx_sl), sl.st.v.ptr, sl.st.v.len);
+	memcpy(HTX_SL_RES_CPTR(htx_sl), sl.st.c.ptr, sl.st.c.len);
+	memcpy(HTX_SL_RES_RPTR(htx_sl), sl.st.r.ptr, sl.st.r.len);
 }
 
 /* Replaces the request start line a new one. It returns the new block on
@@ -617,7 +617,7 @@
         if (type != HTX_BLK_REQ_SL)
                 return NULL;
 
-	size = sizeof(union htx_sl) + sl.rq.m.len + sl.rq.u.len + sl.rq.v.len;
+	size = sizeof(struct htx_sl) + sl.rq.m.len + sl.rq.u.len + sl.rq.v.len;
 	blk = htx_new_blk_value(htx, blk, size);
 	if (!blk)
 		return NULL;
@@ -640,7 +640,7 @@
         if (type != HTX_BLK_RES_SL)
                 return NULL;
 
-	size = sizeof(union htx_sl) + sl.rq.m.len + sl.rq.u.len + sl.rq.v.len;
+	size = sizeof(struct htx_sl) + sl.rq.m.len + sl.rq.u.len + sl.rq.v.len;
 	blk = htx_new_blk_value(htx, blk, size);
 	if (!blk)
 		return NULL;
@@ -659,7 +659,7 @@
         struct htx_blk *blk;
 	uint32_t size;
 
-	size = sizeof(union htx_sl) + sl.rq.m.len + sl.rq.u.len + sl.rq.v.len;
+	size = sizeof(struct htx_sl) + sl.rq.m.len + sl.rq.u.len + sl.rq.v.len;
 
         /* FIXME: check size (< 256MB) */
         blk = htx_add_blk(htx, HTX_BLK_REQ_SL, size);
@@ -679,7 +679,7 @@
         struct htx_blk *blk;
 	uint32_t size;
 
-	size = sizeof(union htx_sl) + sl.st.v.len + sl.st.c.len + sl.st.r.len;
+	size = sizeof(struct htx_sl) + sl.st.v.len + sl.st.c.len + sl.st.r.len;
 
         /* FIXME: check size (< 256MB) */
         blk = htx_add_blk(htx, HTX_BLK_RES_SL, size);
@@ -824,16 +824,16 @@
  * chunk <chk>. It returns 1 if data are successfully appended, otherwise it
  * returns 0.
  */
-int htx_reqline_to_str(const union htx_sl *sl, struct buffer *chk)
+int htx_reqline_to_str(const struct htx_sl *sl, struct buffer *chk)
 {
-	if (sl->rq.m_len + sl->rq.u_len + sl->rq.v_len + 4 > b_room(chk))
+	if (HTX_SL_LEN(sl) + 4 > b_room(chk))
 		return 0;
 
-	chunk_memcat(chk, sl->rq.l, sl->rq.m_len);
+	chunk_memcat(chk, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl));
 	chunk_memcat(chk, " ", 1);
-	chunk_memcat(chk, sl->rq.l + sl->rq.m_len, sl->rq.u_len);
+	chunk_memcat(chk, HTX_SL_REQ_UPTR(sl), HTX_SL_REQ_ULEN(sl));
 	chunk_memcat(chk, " ", 1);
-	chunk_memcat(chk, sl->rq.l + sl->rq.m_len + sl->rq.u_len, sl->rq.v_len);
+	chunk_memcat(chk, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl));
 	chunk_memcat(chk, "\r\n", 2);
 
 	return 1;
@@ -843,16 +843,16 @@
  * <chk>. It returns 1 if data are successfully appended, otherwise it
  * returns 0.
  */
-int htx_stline_to_str(const union htx_sl *sl, struct buffer *chk)
+int htx_stline_to_str(const struct htx_sl *sl, struct buffer *chk)
 {
-	if (sl->st.v_len + sl->st.c_len + sl->st.r_len + 4 > b_size(chk))
+	if (HTX_SL_LEN(sl) + 4 > b_size(chk))
 		return 0;
 
-	chunk_memcat(chk, sl->st.l, sl->st.v_len);
+	chunk_memcat(chk, HTX_SL_RES_VPTR(sl), HTX_SL_RES_VLEN(sl));
 	chunk_memcat(chk, " ", 1);
-	chunk_memcat(chk, sl->st.l + sl->st.v_len, sl->st.c_len);
+	chunk_memcat(chk, HTX_SL_RES_CPTR(sl), HTX_SL_RES_CLEN(sl));
 	chunk_memcat(chk, " ", 1);
-	chunk_memcat(chk, sl->st.l + sl->st.v_len + sl->st.c_len, sl->st.r_len);
+	chunk_memcat(chk, HTX_SL_RES_RPTR(sl), HTX_SL_RES_RLEN(sl));
 	chunk_memcat(chk, "\r\n", 2);
 
 	return 1;