Optimize estimating JSON string length.

Barenboim · Barenboim · commit 9c2ce5297eeb · 2024-01-21T17:40:07.000+08:00
diff --git a/json_parser.c b/json_parser.c
@@ -58,18 +58,16 @@ static int __json_string_length(const char *cursor)
 
 	while (*cursor != '\"')
 	{
-		if ((unsigned char)*cursor < ' ')
-			return -2;
-
-		cursor++;
-		if (cursor[-1] == '\\')
+		if (*cursor == '\\')
 		{
+			cursor++;
 			if (*cursor == '\0')
 				return -2;
-
-			cursor++;
 		}
+		else if ((unsigned char)*cursor < ' ')
+			return -2;
 
+		cursor++;
 		len++;
 	}
 

Original file line number	Diff line number	Diff line change
`@@ -58,18 +58,16 @@ static int __json_string_length(const char *cursor)`
`58`	`58`
`59`	`59`	`while (*cursor != '\"')`
`60`	`60`	`{`
`61`		`- if ((unsigned char)*cursor < ' ')`
`62`		`- return -2;`
`63`		`-`
`64`		`- cursor++;`
`65`		`- if (cursor[-1] == '\\')`
	`61`	`+ if (*cursor == '\\')`
`66`	`62`	`{`
	`63`	`+ cursor++;`
`67`	`64`	`if (*cursor == '\0')`
`68`	`65`	`return -2;`
`69`		`-`
`70`		`- cursor++;`
`71`	`66`	`}`
	`67`	`+ else if ((unsigned char)*cursor < ' ')`
	`68`	`+ return -2;`
`72`	`69`
	`70`	`+ cursor++;`
`73`	`71`	`len++;`
`74`	`72`	`}`
`75`	`73`