Remove various unnecessary (char *) casts

Remove a number of (char *) casts that are unnecessary.  Or in some
cases, rewrite the code to make the purpose of the cast clearer.

Reviewed-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Discussion: https://www.postgresql.org/message-id/flat/fd1fcedb-3492-4fc8-9e3e-74b97f2db6c7%40eisentraut.org

contrib/ltree/ltxtquery_io.c

@@ -410,7 +410,7 @@ ltxtq_in(PG_FUNCTION_ARGS)
 {
 	ltxtquery  *res;
 
-	if ((res = queryin((char *) PG_GETARG_POINTER(0), fcinfo->context)) == NULL)
+	if ((res = queryin(PG_GETARG_POINTER(0), fcinfo->context)) == NULL)
 		PG_RETURN_NULL();
 	PG_RETURN_POINTER(res);
 }

contrib/pg_trgm/trgm_gist.c

@@ -106,7 +106,7 @@ makesign(BITVECP sign, TRGM *a, int siglen)
 	SETBIT(sign, SIGLENBIT(siglen));	/* set last unused bit */
 	for (k = 0; k < len; k++)
 	{
-		CPTRGM(((char *) &tmp), ptr + k);
+		CPTRGM(&tmp, ptr + k);
 		HASH(sign, tmp, siglen);
 	}
 }
@@ -186,7 +186,7 @@ cnt_sml_sign_common(TRGM *qtrg, BITVECP sign, int siglen)
 
 	for (k = 0; k < len; k++)
 	{
-		CPTRGM(((char *) &tmp), ptr + k);
+		CPTRGM(&tmp, ptr + k);
 		count += GETBIT(sign, HASHVAL(tmp, siglen));
 	}
 
@@ -373,7 +373,7 @@ gtrgm_consistent(PG_FUNCTION_ARGS)
 				res = true;
 				for (k = 0; k < len; k++)
 				{
-					CPTRGM(((char *) &tmp), ptr + k);
+					CPTRGM(&tmp, ptr + k);
 					if (!GETBIT(sign, HASHVAL(tmp, siglen)))
 					{
 						res = false;
@@ -426,7 +426,7 @@ gtrgm_consistent(PG_FUNCTION_ARGS)
 					check = (bool *) palloc(len * sizeof(bool));
 					for (k = 0; k < len; k++)
 					{
-						CPTRGM(((char *) &tmp), ptr + k);
+						CPTRGM(&tmp, ptr + k);
 						check[k] = GETBIT(sign, HASHVAL(tmp, siglen));
 					}
 					res = trigramsMatchGraph(cache->graph, check);
@@ -552,7 +552,7 @@ unionkey(BITVECP sbase, TRGM *add, int siglen)
 
 		for (i = 0; i < ARRNELEM(add); i++)
 		{
-			CPTRGM(((char *) &tmp), ptr + i);
+			CPTRGM(&tmp, ptr + i);
 			HASH(sbase, tmp, siglen);
 		}
 	}

contrib/postgres_fdw/postgres_fdw.c

@@ -5660,13 +5660,13 @@ postgresImportForeignSchema(ImportForeignSchemaStmt *stmt, Oid serverOid)
 				attname = PQgetvalue(res, i, 1);
 				typename = PQgetvalue(res, i, 2);
 				attnotnull = PQgetvalue(res, i, 3);
-				attdefault = PQgetisnull(res, i, 4) ? (char *) NULL :
+				attdefault = PQgetisnull(res, i, 4) ? NULL :
 					PQgetvalue(res, i, 4);
-				attgenerated = PQgetisnull(res, i, 5) ? (char *) NULL :
+				attgenerated = PQgetisnull(res, i, 5) ? NULL :
 					PQgetvalue(res, i, 5);
-				collname = PQgetisnull(res, i, 6) ? (char *) NULL :
+				collname = PQgetisnull(res, i, 6) ? NULL :
 					PQgetvalue(res, i, 6);
-				collnamespace = PQgetisnull(res, i, 7) ? (char *) NULL :
+				collnamespace = PQgetisnull(res, i, 7) ? NULL :
 					PQgetvalue(res, i, 7);
 
 				if (first_item)

src/backend/access/transam/xlog.c

@@ -4287,7 +4287,7 @@ WriteControlFile(void)
 	/* Contents are protected with a CRC */
 	INIT_CRC32C(ControlFile->crc);
 	COMP_CRC32C(ControlFile->crc,
-				(char *) ControlFile,
+				ControlFile,
 				offsetof(ControlFileData, crc));
 	FIN_CRC32C(ControlFile->crc);
 
@@ -4405,7 +4405,7 @@ ReadControlFile(void)
 	/* Now check the CRC. */
 	INIT_CRC32C(crc);
 	COMP_CRC32C(crc,
-				(char *) ControlFile,
+				ControlFile,
 				offsetof(ControlFileData, crc));
 	FIN_CRC32C(crc);
 

src/backend/libpq/auth.c

@@ -2932,8 +2932,8 @@ PerformRadiusTransaction(const char *server, const char *secret, const char *por
 	radius_packet radius_recv_pack;
 	radius_packet *packet = &radius_send_pack;
 	radius_packet *receivepacket = &radius_recv_pack;
-	char	   *radius_buffer = (char *) &radius_send_pack;
-	char	   *receive_buffer = (char *) &radius_recv_pack;
+	void	   *radius_buffer = &radius_send_pack;
+	void	   *receive_buffer = &radius_recv_pack;
 	int32		service = pg_hton32(RADIUS_AUTHENTICATE_ONLY);
 	uint8	   *cryptvector;
 	int			encryptedpasswordlen;
@@ -3204,7 +3204,9 @@ PerformRadiusTransaction(const char *server, const char *secret, const char *por
 																		 * original packet */
 		if (packetlength > RADIUS_HEADER_LENGTH)	/* there may be no
 													 * attributes at all */
-			memcpy(cryptvector + RADIUS_HEADER_LENGTH, receive_buffer + RADIUS_HEADER_LENGTH, packetlength - RADIUS_HEADER_LENGTH);
+			memcpy(cryptvector + RADIUS_HEADER_LENGTH,
+				   (char *) receive_buffer + RADIUS_HEADER_LENGTH,
+				   packetlength - RADIUS_HEADER_LENGTH);
 		memcpy(cryptvector + packetlength, secret, strlen(secret));
 
 		if (!pg_md5_binary(cryptvector,

src/backend/nodes/copyfuncs.c

@@ -40,7 +40,7 @@
 
 /* Copy a field that is a pointer to a C string, or perhaps NULL */
 #define COPY_STRING_FIELD(fldname) \
-	(newnode->fldname = from->fldname ? pstrdup(from->fldname) : (char *) NULL)
+	(newnode->fldname = from->fldname ? pstrdup(from->fldname) : NULL)
 
 /* Copy a field that is an inline array */
 #define COPY_ARRAY_FIELD(fldname) \

src/backend/nodes/makefuncs.c

@@ -51,7 +51,7 @@ makeSimpleA_Expr(A_Expr_Kind kind, char *name,
 	A_Expr	   *a = makeNode(A_Expr);
 
 	a->kind = kind;
-	a->name = list_make1(makeString((char *) name));
+	a->name = list_make1(makeString(name));
 	a->lexpr = lexpr;
 	a->rexpr = rexpr;
 	a->location = location;

src/backend/storage/page/bufpage.c

@@ -1502,7 +1502,7 @@ PageSetChecksumCopy(Page page, BlockNumber blkno)
 
 	/* If we don't need a checksum, just return the passed-in data */
 	if (PageIsNew(page) || !DataChecksumsEnabled())
-		return (char *) page;
+		return page;
 
 	/*
 	 * We allocate the copy space once and use it over on each subsequent

src/backend/utils/cache/relmapper.c

@@ -854,7 +854,7 @@ read_relmap_file(RelMapFile *map, char *dbpath, bool lock_held, int elevel)
 
 	/* verify the CRC */
 	INIT_CRC32C(crc);
-	COMP_CRC32C(crc, (char *) map, offsetof(RelMapFile, crc));
+	COMP_CRC32C(crc, map, offsetof(RelMapFile, crc));
 	FIN_CRC32C(crc);
 
 	if (!EQ_CRC32C(crc, map->crc))
@@ -910,7 +910,7 @@ write_relmap_file(RelMapFile *newmap, bool write_wal, bool send_sinval,
 		elog(ERROR, "attempt to write bogus relation mapping");
 
 	INIT_CRC32C(newmap->crc);
-	COMP_CRC32C(newmap->crc, (char *) newmap, offsetof(RelMapFile, crc));
+	COMP_CRC32C(newmap->crc, newmap, offsetof(RelMapFile, crc));
 	FIN_CRC32C(newmap->crc);
 
 	/*

src/backend/utils/error/jsonlog.c

@@ -206,7 +206,7 @@ write_jsonlog(ErrorData *edata)
 	/* Error severity */
 	if (edata->elevel)
 		appendJSONKeyValue(&buf, "error_severity",
-						   (char *) error_severity(edata->elevel), true);
+						   error_severity(edata->elevel), true);
 
 	/* SQL state code */
 	if (edata->sqlerrcode)

src/bin/pg_basebackup/pg_receivewal.c

@@ -342,7 +342,7 @@ FindStreamingStart(uint32 *tli)
 			if (lseek(fd, (off_t) (-4), SEEK_END) < 0)
 				pg_fatal("could not seek in compressed file \"%s\": %m",
 						 fullpath);
-			r = read(fd, (char *) buf, sizeof(buf));
+			r = read(fd, buf, sizeof(buf));
 			if (r != sizeof(buf))
 			{
 				if (r < 0)

src/bin/pg_dump/compress_gzip.c

@@ -129,7 +129,7 @@ DeflateCompressorCommon(ArchiveHandle *AH, CompressorState *cs, bool flush)
 				 */
 				size_t		len = gzipcs->outsize - zp->avail_out;
 
-				cs->writeF(AH, (char *) out, len);
+				cs->writeF(AH, out, len);
 			}
 			zp->next_out = out;
 			zp->avail_out = gzipcs->outsize;

src/bin/pg_rewind/pg_rewind.c

@@ -1007,7 +1007,7 @@ checkControlFile(ControlFileData *ControlFile)
 
 	/* Calculate CRC */
 	INIT_CRC32C(crc);
-	COMP_CRC32C(crc, (char *) ControlFile, offsetof(ControlFileData, crc));
+	COMP_CRC32C(crc, ControlFile, offsetof(ControlFileData, crc));
 	FIN_CRC32C(crc);
 
 	/* And simply compare it */

src/bin/psql/describe.c

@@ -1741,7 +1741,7 @@ describeOneTableDetails(const char *schemaname,
 		*(PQgetvalue(res, 0, 13)) : 'd';
 	if (pset.sversion >= 120000)
 		tableinfo.relam = PQgetisnull(res, 0, 14) ?
-			(char *) NULL : pg_strdup(PQgetvalue(res, 0, 14));
+			NULL : pg_strdup(PQgetvalue(res, 0, 14));
 	else
 		tableinfo.relam = NULL;
 	PQclear(res);

src/common/controldata_utils.c

@@ -135,7 +135,7 @@ retry:
 	/* Check the CRC. */
 	INIT_CRC32C(crc);
 	COMP_CRC32C(crc,
-				(char *) ControlFile,
+				ControlFile,
 				offsetof(ControlFileData, crc));
 	FIN_CRC32C(crc);
 
@@ -199,7 +199,7 @@ update_controlfile(const char *DataDir,
 	/* Recalculate CRC of control file */
 	INIT_CRC32C(ControlFile->crc);
 	COMP_CRC32C(ControlFile->crc,
-				(char *) ControlFile,
+				ControlFile,
 				offsetof(ControlFileData, crc));
 	FIN_CRC32C(ControlFile->crc);
 

src/interfaces/ecpg/ecpglib/descriptor.c

@@ -198,7 +198,7 @@ get_char_item(int lineno, void *var, enum ECPGttype vartype, char *value, int va
 		case ECPGt_char:
 		case ECPGt_unsigned_char:
 		case ECPGt_string:
-			strncpy((char *) var, value, varcharsize);
+			strncpy(var, value, varcharsize);
 			break;
 		case ECPGt_varchar:
 			{
@@ -597,7 +597,7 @@ set_desc_attr(struct descriptor_item *desc_item, struct variable *var,
 	}
 
 	ecpg_free(desc_item->data); /* free() takes care of a potential NULL value */
-	desc_item->data = (char *) tobeinserted;
+	desc_item->data = tobeinserted;
 }
 
 

src/interfaces/ecpg/ecpglib/execute.c

@@ -278,7 +278,7 @@ ecpg_is_type_an_array(int type, const struct statement *stmt, const struct varia
 			isarray = ECPG_ARRAY_NONE;
 		else
 		{
-			isarray = (atoi((char *) PQgetvalue(query, 0, 0)) == -1) ? ECPG_ARRAY_ARRAY : ECPG_ARRAY_VECTOR;
+			isarray = (atoi(PQgetvalue(query, 0, 0)) == -1) ? ECPG_ARRAY_ARRAY : ECPG_ARRAY_VECTOR;
 			if (ecpg_dynamic_type(type) == SQL3_CHARACTER ||
 				ecpg_dynamic_type(type) == SQL3_CHARACTER_VARYING)
 			{

src/interfaces/ecpg/pgtypeslib/numeric.c

@@ -232,7 +232,7 @@ get_str_from_var(numeric *var, int dscale)
 
 	if (var->sign == NUMERIC_NAN)
 	{
-		str = (char *) pgtypes_alloc(4);
+		str = pgtypes_alloc(4);
 		if (str == NULL)
 			return NULL;
 		sprintf(str, "NaN");
@@ -269,7 +269,7 @@ get_str_from_var(numeric *var, int dscale)
 	/*
 	 * Allocate space for the result
 	 */
-	if ((str = (char *) pgtypes_alloc(Max(0, dscale) + Max(0, var->weight) + 4)) == NULL)
+	if ((str = pgtypes_alloc(Max(0, dscale) + Max(0, var->weight) + 4)) == NULL)
 		return NULL;
 	cp = str;