From: Alexander Borisov <alexander.borisov@nginx.com>
Date: Tue, 23 Apr 2019 15:10:37 +0000 (+0300)
Subject: Added macro for converting surrogate pair to code point.
X-Git-Tag: 0.3.2~51
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=44e9ad6b9d434ca031b15532e2eb703d7715bb81;p=njs.git

Added macro for converting surrogate pair to code point.
---

diff --git a/njs/njs_json.c b/njs/njs_json.c
index e94d506a..203c236f 100644
--- a/njs/njs_json.c
+++ b/njs/njs_json.c
@@ -820,7 +820,7 @@ njs_json_parse_string(njs_json_parse_ctx_t *ctx, njs_value_t *value,
                     return NULL;
                 }
 
-                utf = 0x10000 + ((utf - 0xd800) << 10) + (utf_low - 0xdc00);
+                utf = njs_string_surrogate_pair(utf, utf_low);
             }
 
             s = nxt_utf8_encode(s, utf);
diff --git a/njs/njs_parser_terminal.c b/njs/njs_parser_terminal.c
index 77ade529..72226c0e 100644
--- a/njs/njs_parser_terminal.c
+++ b/njs/njs_parser_terminal.c
@@ -1048,10 +1048,8 @@ njs_parser_escape_string_create(njs_vm_t *vm, njs_parser_t *parser,
             src++;
         }
 
-        /* Surrogate pair. */
-
         if (cp_pair != 0) {
-            cp = 0x10000 + ((cp_pair - 0xd800) << 10) + (cp - 0xdc00);
+            cp = njs_string_surrogate_pair(cp_pair, cp);
             cp_pair = 0;
 
         } else if (cp >= 0xd800 && cp <= 0xdfff) {
@@ -1184,14 +1182,12 @@ njs_parser_escape_string_calc_length(njs_vm_t *vm, njs_parser_t *parser,
             }
         }
 
-        /* Surrogate pair. */
-
         if (cp_pair != 0) {
             if (nxt_slow_path(cp < 0xdc00 || cp > 0xdfff)) {
                 goto invalid_pair;
             }
 
-            cp = 0x10000 + ((cp_pair - 0xd800) << 10) + (cp - 0xdc00);
+            cp = njs_string_surrogate_pair(cp_pair, cp);
             cp_pair = 0;
 
         } else if (cp >= 0xd800 && cp <= 0xdfff) {
diff --git a/njs/njs_string.h b/njs/njs_string.h
index f3c64621..bf227d91 100644
--- a/njs/njs_string.h
+++ b/njs/njs_string.h
@@ -27,6 +27,10 @@
 /* The maximum signed int32_t. */
 #define NJS_STRING_MAX_LENGTH  0x7fffffff
 
+/* Converting surrogate pair to code point.  */
+#define njs_string_surrogate_pair(high, low)                                  \
+    (0x10000 + ((high - 0xd800) << 10) + (low - 0xdc00))
+
 /*
  * NJS_STRING_MAP_STRIDE should be power of two to use shift and binary
  * AND operations instead of division and remainder operations but no