jsonapi: Use size_t

Use size_t instead of int for object sizes in the jsonapi.  This makes
the API better self-documenting.

Reviewed-by: Andrew Dunstan <andrew@dunslane.net>
Discussion: https://www.postgresql.org/message-id/flat/f732b014-f614-4600-a437-dba5a2c3738b%40eisentraut.org

src/common/jsonapi.c

@@ -85,7 +85,7 @@ struct JsonParserStack
 {
 	int			stack_size;
 	char	   *prediction;
-	int			pred_index;
+	size_t		pred_index;
 	/* these two are indexed by lex_level */
 	char	  **fnames;
 	bool	   *fnull;
@@ -212,7 +212,7 @@ static char JSON_PROD_GOAL[] = {JSON_TOKEN_END, JSON_NT_JSON, 0};
 
 static inline JsonParseErrorType json_lex_string(JsonLexContext *lex);
 static inline JsonParseErrorType json_lex_number(JsonLexContext *lex, char *s,
-												 bool *num_err, int *total_len);
+												 bool *num_err, size_t *total_len);
 static inline JsonParseErrorType parse_scalar(JsonLexContext *lex, JsonSemAction *sem);
 static JsonParseErrorType parse_object_field(JsonLexContext *lex, JsonSemAction *sem);
 static JsonParseErrorType parse_object(JsonLexContext *lex, JsonSemAction *sem);
@@ -269,10 +269,10 @@ lex_expect(JsonParseContext ctx, JsonLexContext *lex, JsonTokenType token)
  * str is of length len, and need not be null-terminated.
  */
 bool
-IsValidJsonNumber(const char *str, int len)
+IsValidJsonNumber(const char *str, size_t len)
 {
 	bool		numeric_error;
-	int			total_len;
+	size_t		total_len;
 	JsonLexContext dummy_lex;
 
 	if (len <= 0)
@@ -324,7 +324,7 @@ IsValidJsonNumber(const char *str, int len)
  */
 JsonLexContext *
 makeJsonLexContextCstringLen(JsonLexContext *lex, char *json,
-							 int len, int encoding, bool need_escapes)
+							 size_t len, int encoding, bool need_escapes)
 {
 	if (lex == NULL)
 	{
@@ -650,7 +650,7 @@ JsonParseErrorType
 pg_parse_json_incremental(JsonLexContext *lex,
 						  JsonSemAction *sem,
 						  char *json,
-						  int len,
+						  size_t len,
 						  bool is_last)
 {
 	JsonTokenType tok;
@@ -888,7 +888,7 @@ pg_parse_json_incremental(JsonLexContext *lex,
 							}
 							else
 							{
-								int			tlen = (lex->token_terminator - lex->token_start);
+								ptrdiff_t	tlen = (lex->token_terminator - lex->token_start);
 
 								pstack->scalar_val = palloc(tlen + 1);
 								memcpy(pstack->scalar_val, lex->token_start, tlen);
@@ -1332,7 +1332,7 @@ json_lex(JsonLexContext *lex)
 		 * recursive call
 		 */
 		StringInfo	ptok = &(lex->inc_state->partial_token);
-		int			added = 0;
+		size_t		added = 0;
 		bool		tok_done = false;
 		JsonLexContext dummy_lex;
 		JsonParseErrorType partial_result;
@@ -1354,7 +1354,7 @@ json_lex(JsonLexContext *lex)
 					break;
 			}
 
-			for (int i = 0; i < lex->input_length; i++)
+			for (size_t i = 0; i < lex->input_length; i++)
 			{
 				char		c = lex->input[i];
 
@@ -1382,7 +1382,7 @@ json_lex(JsonLexContext *lex)
 
 				bool		numend = false;
 
-				for (int i = 0; i < lex->input_length && !numend; i++)
+				for (size_t i = 0; i < lex->input_length && !numend; i++)
 				{
 					char		cc = lex->input[i];
 
@@ -1418,7 +1418,7 @@ json_lex(JsonLexContext *lex)
 			 * {null, false, true} literals as well as any trailing
 			 * alphanumeric junk on non-string tokens.
 			 */
-			for (int i = added; i < lex->input_length; i++)
+			for (size_t i = added; i < lex->input_length; i++)
 			{
 				char		cc = lex->input[i];
 
@@ -1941,7 +1941,7 @@ json_lex_string(JsonLexContext *lex)
  */
 static inline JsonParseErrorType
 json_lex_number(JsonLexContext *lex, char *s,
-				bool *num_err, int *total_len)
+				bool *num_err, size_t *total_len)
 {
 	bool		error = false;
 	int			len = s - lex->input;

src/common/parse_manifest.c

@@ -183,7 +183,7 @@ json_parse_manifest_incremental_shutdown(JsonManifestParseIncrementalState *incs
 
 void
 json_parse_manifest_incremental_chunk(
-									  JsonManifestParseIncrementalState *incstate, char *chunk, int size,
+									  JsonManifestParseIncrementalState *incstate, char *chunk, size_t size,
 									  bool is_last)
 {
 	JsonParseErrorType res,

src/include/common/jsonapi.h

@@ -89,7 +89,7 @@ typedef struct JsonIncrementalState JsonIncrementalState;
 typedef struct JsonLexContext
 {
 	char	   *input;
-	int			input_length;
+	size_t		input_length;
 	int			input_encoding;
 	char	   *token_start;
 	char	   *token_terminator;
@@ -158,7 +158,7 @@ extern JsonParseErrorType pg_parse_json(JsonLexContext *lex,
 extern JsonParseErrorType pg_parse_json_incremental(JsonLexContext *lex,
 													JsonSemAction *sem,
 													char *json,
-													int len,
+													size_t len,
 													bool is_last);
 
 /* the null action object used for pure validation */
@@ -193,7 +193,7 @@ extern JsonParseErrorType json_count_array_elements(JsonLexContext *lex,
  */
 extern JsonLexContext *makeJsonLexContextCstringLen(JsonLexContext *lex,
 													char *json,
-													int len,
+													size_t len,
 													int encoding,
 													bool need_escapes);
 
@@ -219,6 +219,6 @@ extern char *json_errdetail(JsonParseErrorType error, JsonLexContext *lex);
  *
  * str argument does not need to be nul-terminated.
  */
-extern bool IsValidJsonNumber(const char *str, int len);
+extern bool IsValidJsonNumber(const char *str, size_t len);
 
 #endif							/* JSONAPI_H */

src/include/common/parse_manifest.h

@@ -51,7 +51,7 @@ extern void json_parse_manifest(JsonManifestParseContext *context,
 								char *buffer, size_t size);
 extern JsonManifestParseIncrementalState *json_parse_manifest_incremental_init(JsonManifestParseContext *context);
 extern void json_parse_manifest_incremental_chunk(
-												  JsonManifestParseIncrementalState *incstate, char *chunk, int size,
+												  JsonManifestParseIncrementalState *incstate, char *chunk, size_t size,
 												  bool is_last);
 extern void json_parse_manifest_incremental_shutdown(JsonManifestParseIncrementalState *incstate);