Break out errno into its own field.

http_parser.c

@@ -34,11 +34,14 @@
 #if HTTP_PARSER_DEBUG
 #define SET_ERRNO(e)                                                 \
 do {                                                                 \
-  parser->state = 0x80 | (e);                                        \
+  parser->errno = (e);                                               \
   parser->error_lineno = __LINE__;                                   \
 } while (0)
 #else
-#define SET_ERRNO(e) do { parser->state = 0x80 | (e); } while(0)
+#define SET_ERRNO(e)                                                 \
+do {                                                                 \
+  parser->errno = (e);                                               \
+} while(0)
 #endif
 
 
@@ -373,9 +376,7 @@ size_t http_parser_execute (http_parser *parser,
   uint64_t index = parser->index;
   uint64_t nread = parser->nread;
 
-  /* We're in an error state. Don't attempt to do anything lest we overwrite
-   * the error information that landed us here.
-   */
+  /* We're in an error state. Don't bother doing anything. */
   if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
     return 0;
   }
@@ -1795,6 +1796,7 @@ http_parser_init (http_parser *parser, enum http_parser_type t)
   parser->upgrade = 0;
   parser->flags = 0;
   parser->method = 0;
+  parser->errno = 0;
 }
 
 const char *

http_parser.h

@@ -150,7 +150,7 @@ enum flags
   XX(CB_header_field, "the on_header_field callback failed")         \
   XX(CB_header_value, "the on_header_value callback failed")         \
   XX(CB_headers_complete, "the on_headers_complete callback failed") \
-  XX(CB_body, "th on_body callback failed")                          \
+  XX(CB_body, "the on_body callback failed")                         \
   XX(CB_message_complete, "the on_message_complete callback failed") \
                                                                      \
   /* Parsing-related errors */                                       \
@@ -189,9 +189,7 @@ enum http_errno {
 
 
 /* Get an http_errno value from an http_parser */
-#define HTTP_PARSER_ERRNO(p)                                         \
-    ((enum http_errno) (((p)->state & 0x80) ? (p)->state & ~0x80 : 0))
-
+#define HTTP_PARSER_ERRNO(p)            ((enum http_errno) (p)->errno)
 
 /* Get the line number that generated the current error */
 #if HTTP_PARSER_DEBUG
@@ -217,13 +215,14 @@ struct http_parser {
   unsigned short http_minor;
   unsigned short status_code; /* responses only */
   unsigned char method;    /* requests only */
+  unsigned char errno : 7;
 
   /* 1 = Upgrade header was present and the parser has exited because of that.
    * 0 = No upgrade header present.
    * Should be checked when http_parser_execute() returns in addition to
    * error checking.
    */
-  char upgrade;
+  char upgrade : 1;
 
 #if HTTP_PARSER_DEBUG
   uint32_t error_lineno;