Add function http_parser_version().

Fixes #115.

http_parser.c

@@ -2173,3 +2173,10 @@ int
 http_body_is_final(const struct http_parser *parser) {
     return parser->state == s_message_done;
 }
+
+unsigned long
+http_parser_version(void) {
+  return HTTP_PARSER_VERSION_MAJOR * 0x10000 |
+         HTTP_PARSER_VERSION_MINOR * 0x00100 |
+         HTTP_PARSER_VERSION_PATCH * 0x00001;
+}

http_parser.h

@@ -27,6 +27,7 @@ extern "C" {
 /* Also update SONAME in the Makefile whenever you change these. */
 #define HTTP_PARSER_VERSION_MAJOR 2
 #define HTTP_PARSER_VERSION_MINOR 1
+#define HTTP_PARSER_VERSION_PATCH 0
 
 #include <sys/types.h>
 #if defined(_WIN32) && !defined(__MINGW32__) && (!defined(_MSC_VER) || _MSC_VER<1600)
@@ -262,6 +263,18 @@ struct http_parser_url {
 };
 
 
+/* Returns the library version. Bits 16-23 contain the major version number,
+ * bits 8-15 the minor version number and bits 0-7 the patch level.
+ * Usage example:
+ *
+ *   unsigned long version = http_parser_version();
+ *   unsigned major = (version >> 16) & 255;
+ *   unsigned minor = (version >> 8) & 255;
+ *   unsigned patch = version & 255;
+ *   printf("http_parser v%u.%u.%u\n", major, minor, version);
+ */
+unsigned long http_parser_version(void);
+
 void http_parser_init(http_parser *parser, enum http_parser_type type);
 
 

test.c

@@ -3170,6 +3170,16 @@ main (void)
   int i, j, k;
   int request_count;
   int response_count;
+  unsigned long version;
+  unsigned major;
+  unsigned minor;
+  unsigned patch;
+
+  version = http_parser_version();
+  major = (version >> 16) & 255;
+  minor = (version >> 8) & 255;
+  patch = version & 255;
+  printf("http_parser v%u.%u.%u (0x%06lx)\n", major, minor, patch, version);
 
   printf("sizeof(http_parser) = %u\n", (unsigned int)sizeof(http_parser));