Fixed segmentation fault with text representation

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 0.4.4 (unreleased)
 
 - Improved error message for malformed vector literal
+- Fixed segmentation fault with text representation
 - Fixed consecutive delimiters with text representation
 
 ## 0.4.3 (2023-06-10)

src/vector.c

@@ -194,7 +194,7 @@ vector_in(PG_FUNCTION_ARGS)
 		pt = strtok(NULL, ",");
 	}
 
-	if (*stringEnd != ']')
+	if (stringEnd == NULL || *stringEnd != ']')
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
 				 errmsg("malformed vector literal: \"%s\"", lit),

test/expected/input.out

@@ -81,6 +81,16 @@ ERROR:  malformed vector literal: "1,2,3"
 LINE 1: SELECT '1,2,3'::vector;
                ^
 DETAIL:  Vector contents must start with "[".
+SELECT '['::vector;
+ERROR:  malformed vector literal: "["
+LINE 1: SELECT '['::vector;
+               ^
+DETAIL:  Unexpected end of input.
+SELECT '[,'::vector;
+ERROR:  malformed vector literal: "[,"
+LINE 1: SELECT '[,'::vector;
+               ^
+DETAIL:  Unexpected end of input.
 SELECT '[]'::vector;
 ERROR:  vector must have at least 1 dimension
 LINE 1: SELECT '[]'::vector;

test/sql/input.sql

@@ -14,6 +14,8 @@ SELECT '[4e38,1]'::vector;
 SELECT '[1,2,3'::vector;
 SELECT '[1,2,3]9'::vector;
 SELECT '1,2,3'::vector;
+SELECT '['::vector;
+SELECT '[,'::vector;
 SELECT '[]'::vector;
 SELECT '[1,]'::vector;
 SELECT '[1a]'::vector;