Remove unnecessary (char *) casts [mem]

Remove (char *) casts around memory functions such as memcmp(),
memcpy(), or memset() where the cast is useless.  Since these
functions don't take char * arguments anyway, these casts are at best
complicated casts to (void *), about which see commit 7f798aca1d5.

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

contrib/pg_trgm/trgm_gist.c

@@ -228,7 +228,7 @@ gtrgm_consistent(PG_FUNCTION_ARGS)
 	if (cache == NULL ||
 		cache->strategy != strategy ||
 		VARSIZE(cache->query) != querysize ||
-		memcmp((char *) cache->query, (char *) query, querysize) != 0)
+		memcmp(cache->query, query, querysize) != 0)
 	{
 		gtrgm_consistent_cache *newcache;
 		TrgmPackedGraph *graph = NULL;
@@ -284,12 +284,12 @@ gtrgm_consistent(PG_FUNCTION_ARGS)
 		newcache->strategy = strategy;
 		newcache->query = (text *)
 			((char *) newcache + MAXALIGN(sizeof(gtrgm_consistent_cache)));
-		memcpy((char *) newcache->query, (char *) query, querysize);
+		memcpy(newcache->query, query, querysize);
 		if (qtrg)
 		{
 			newcache->trigrams = (TRGM *)
 				((char *) newcache->query + MAXALIGN(querysize));
-			memcpy((char *) newcache->trigrams, (char *) qtrg, qtrgsize);
+			memcpy((char *) newcache->trigrams, qtrg, qtrgsize);
 			/* release qtrg in case it was made in fn_mcxt */
 			pfree(qtrg);
 		}

contrib/xml2/xpath.c

@@ -278,8 +278,8 @@ xpath_string(PG_FUNCTION_ARGS)
 	/* We could try casting to string using the libxml function? */
 
 	xpath = (xmlChar *) palloc(pathsize + 9);
-	memcpy((char *) xpath, "string(", 7);
-	memcpy((char *) (xpath + 7), VARDATA_ANY(xpathsupp), pathsize);
+	memcpy(xpath, "string(", 7);
+	memcpy(xpath + 7, VARDATA_ANY(xpathsupp), pathsize);
 	xpath[pathsize + 7] = ')';
 	xpath[pathsize + 8] = '\0';
 

src/backend/access/common/heaptuple.c

@@ -787,7 +787,7 @@ heap_copytuple(HeapTuple tuple)
 	newTuple->t_self = tuple->t_self;
 	newTuple->t_tableOid = tuple->t_tableOid;
 	newTuple->t_data = (HeapTupleHeader) ((char *) newTuple + HEAPTUPLESIZE);
-	memcpy((char *) newTuple->t_data, (char *) tuple->t_data, tuple->t_len);
+	memcpy(newTuple->t_data, tuple->t_data, tuple->t_len);
 	return newTuple;
 }
 
@@ -813,7 +813,7 @@ heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest)
 	dest->t_self = src->t_self;
 	dest->t_tableOid = src->t_tableOid;
 	dest->t_data = (HeapTupleHeader) palloc(src->t_len);
-	memcpy((char *) dest->t_data, (char *) src->t_data, src->t_len);
+	memcpy(dest->t_data, src->t_data, src->t_len);
 }
 
 /*
@@ -1097,7 +1097,7 @@ heap_copy_tuple_as_datum(HeapTuple tuple, TupleDesc tupleDesc)
 	 * the given tuple came from disk, rather than from heap_form_tuple).
 	 */
 	td = (HeapTupleHeader) palloc(tuple->t_len);
-	memcpy((char *) td, (char *) tuple->t_data, tuple->t_len);
+	memcpy(td, tuple->t_data, tuple->t_len);
 
 	HeapTupleHeaderSetDatumLength(td, tuple->t_len);
 	HeapTupleHeaderSetTypeId(td, tupleDesc->tdtypeid);

src/backend/access/heap/heapam_xlog.c

@@ -480,11 +480,11 @@ heap_xlog_insert(XLogReaderState *record)
 
 		newlen = datalen - SizeOfHeapHeader;
 		Assert(datalen > SizeOfHeapHeader && newlen <= MaxHeapTupleSize);
-		memcpy((char *) &xlhdr, data, SizeOfHeapHeader);
+		memcpy(&xlhdr, data, SizeOfHeapHeader);
 		data += SizeOfHeapHeader;
 
 		htup = &tbuf.hdr;
-		MemSet((char *) htup, 0, SizeofHeapTupleHeader);
+		MemSet(htup, 0, SizeofHeapTupleHeader);
 		/* PG73FORMAT: get bitmap [+ padding] [+ oid] + data */
 		memcpy((char *) htup + SizeofHeapTupleHeader,
 			   data,
@@ -625,10 +625,10 @@ heap_xlog_multi_insert(XLogReaderState *record)
 			newlen = xlhdr->datalen;
 			Assert(newlen <= MaxHeapTupleSize);
 			htup = &tbuf.hdr;
-			MemSet((char *) htup, 0, SizeofHeapTupleHeader);
+			MemSet(htup, 0, SizeofHeapTupleHeader);
 			/* PG73FORMAT: get bitmap [+ padding] [+ oid] + data */
 			memcpy((char *) htup + SizeofHeapTupleHeader,
-				   (char *) tupdata,
+				   tupdata,
 				   newlen);
 			tupdata += newlen;
 
@@ -854,14 +854,14 @@ heap_xlog_update(XLogReaderState *record, bool hot_update)
 			recdata += sizeof(uint16);
 		}
 
-		memcpy((char *) &xlhdr, recdata, SizeOfHeapHeader);
+		memcpy(&xlhdr, recdata, SizeOfHeapHeader);
 		recdata += SizeOfHeapHeader;
 
 		tuplen = recdata_end - recdata;
 		Assert(tuplen <= MaxHeapTupleSize);
 
 		htup = &tbuf.hdr;
-		MemSet((char *) htup, 0, SizeofHeapTupleHeader);
+		MemSet(htup, 0, SizeofHeapTupleHeader);
 
 		/*
 		 * Reconstruct the new tuple using the prefix and/or suffix from the

src/backend/access/table/toast_helper.c

@@ -75,7 +75,7 @@ toast_tuple_init(ToastTupleContext *ttc)
 			{
 				if (ttc->ttc_isnull[i] ||
 					!VARATT_IS_EXTERNAL_ONDISK(new_value) ||
-					memcmp((char *) old_value, (char *) new_value,
+					memcmp(old_value, new_value,
 						   VARSIZE_EXTERNAL(old_value)) != 0)
 				{
 					/*

src/backend/access/transam/xlog.c

@@ -2089,7 +2089,7 @@ AdvanceXLInsertBuffer(XLogRecPtr upto, TimeLineID tli, bool opportunistic)
 		 * Be sure to re-zero the buffer so that bytes beyond what we've
 		 * written will look like zeroes and not valid XLOG records...
 		 */
-		MemSet((char *) NewPage, 0, XLOG_BLCKSZ);
+		MemSet(NewPage, 0, XLOG_BLCKSZ);
 
 		/*
 		 * Fill the new page's header

src/backend/access/transam/xlogreader.c

@@ -794,7 +794,7 @@ restart:
 				readOff = ReadPageInternal(state, targetPagePtr,
 										   pageHeaderSize + len);
 
-			memcpy(buffer, (char *) contdata, len);
+			memcpy(buffer, contdata, len);
 			buffer += len;
 			gotlen += len;
 

src/backend/bootstrap/bootstrap.c

@@ -463,8 +463,8 @@ boot_openrel(char *relname)
 	{
 		if (attrtypes[i] == NULL)
 			attrtypes[i] = AllocateAttribute();
-		memmove((char *) attrtypes[i],
-				(char *) TupleDescAttr(boot_reldesc->rd_att, i),
+		memmove(attrtypes[i],
+				TupleDescAttr(boot_reldesc->rd_att, i),
 				ATTRIBUTE_FIXED_PART_SIZE);
 
 		{

src/backend/libpq/be-secure-gssapi.c

@@ -641,7 +641,7 @@ secure_open_gssapi(Port *port)
 				return -1;
 			}
 
-			memcpy(PqGSSSendBuffer, (char *) &netlen, sizeof(uint32));
+			memcpy(PqGSSSendBuffer, &netlen, sizeof(uint32));
 			PqGSSSendLength += sizeof(uint32);
 
 			memcpy(PqGSSSendBuffer + PqGSSSendLength, output.value, output.length);

src/backend/replication/logical/decode.c

@@ -1177,9 +1177,7 @@ DecodeMultiInsert(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 
 		memset(header, 0, SizeofHeapTupleHeader);
 
-		memcpy((char *) tuple->t_data + SizeofHeapTupleHeader,
-			   (char *) data,
-			   datalen);
+		memcpy((char *) tuple->t_data + SizeofHeapTupleHeader, data, datalen);
 		header->t_infomask = xlhdr->t_infomask;
 		header->t_infomask2 = xlhdr->t_infomask2;
 		header->t_hoff = xlhdr->t_hoff;
@@ -1265,9 +1263,7 @@ DecodeXLogTuple(char *data, Size len, HeapTuple tuple)
 	tuple->t_tableOid = InvalidOid;
 
 	/* data is not stored aligned, copy to aligned storage */
-	memcpy((char *) &xlhdr,
-		   data,
-		   SizeOfHeapHeader);
+	memcpy(&xlhdr, data, SizeOfHeapHeader);
 
 	memset(header, 0, SizeofHeapTupleHeader);
 

src/backend/storage/buffer/bufmgr.c

@@ -2221,7 +2221,7 @@ ExtendBufferedRelShared(BufferManagerRelation bmr,
 		buf_block = BufHdrGetBlock(GetBufferDescriptor(buffers[i] - 1));
 
 		/* new buffers are zero-filled */
-		MemSet((char *) buf_block, 0, BLCKSZ);
+		MemSet(buf_block, 0, BLCKSZ);
 	}
 
 	/*

src/backend/storage/buffer/localbuf.c

@@ -338,7 +338,7 @@ ExtendBufferedRelLocal(BufferManagerRelation bmr,
 		buf_block = LocalBufHdrGetBlock(buf_hdr);
 
 		/* new buffers are zero-filled */
-		MemSet((char *) buf_block, 0, BLCKSZ);
+		MemSet(buf_block, 0, BLCKSZ);
 	}
 
 	first_block = smgrnblocks(bmr.smgr, fork);

src/backend/storage/file/fd.c

@@ -910,7 +910,7 @@ InitFileAccess(void)
 				(errcode(ERRCODE_OUT_OF_MEMORY),
 				 errmsg("out of memory")));
 
-	MemSet((char *) &(VfdCache[0]), 0, sizeof(Vfd));
+	MemSet(&(VfdCache[0]), 0, sizeof(Vfd));
 	VfdCache->fd = VFD_CLOSED;
 
 	SizeVfdCache = 1;
@@ -1447,7 +1447,7 @@ AllocateVfd(void)
 		 */
 		for (i = SizeVfdCache; i < newCacheSize; i++)
 		{
-			MemSet((char *) &(VfdCache[i]), 0, sizeof(Vfd));
+			MemSet(&(VfdCache[i]), 0, sizeof(Vfd));
 			VfdCache[i].nextFree = i + 1;
 			VfdCache[i].fd = VFD_CLOSED;
 		}

src/backend/storage/page/bufpage.c

@@ -415,7 +415,7 @@ PageRestoreTempPage(Page tempPage, Page oldPage)
 	Size		pageSize;
 
 	pageSize = PageGetPageSize(tempPage);
-	memcpy((char *) oldPage, (char *) tempPage, pageSize);
+	memcpy(oldPage, tempPage, pageSize);
 
 	pfree(tempPage);
 }
@@ -1094,8 +1094,8 @@ PageIndexTupleDelete(Page page, OffsetNumber offnum)
 		((char *) &phdr->pd_linp[offidx + 1] - (char *) phdr);
 
 	if (nbytes > 0)
-		memmove((char *) &(phdr->pd_linp[offidx]),
-				(char *) &(phdr->pd_linp[offidx + 1]),
+		memmove(&(phdr->pd_linp[offidx]),
+				&(phdr->pd_linp[offidx + 1]),
 				nbytes);
 
 	/*
@@ -1516,7 +1516,7 @@ PageSetChecksumCopy(Page page, BlockNumber blkno)
 											 PG_IO_ALIGN_SIZE,
 											 0);
 
-	memcpy(pageCopy, (char *) page, BLCKSZ);
+	memcpy(pageCopy, page, BLCKSZ);
 	((PageHeader) pageCopy)->pd_checksum = pg_checksum_page(pageCopy, blkno);
 	return pageCopy;
 }

src/backend/tcop/postgres.c

@@ -4991,8 +4991,8 @@ ShowUsage(const char *title)
 
 	getrusage(RUSAGE_SELF, &r);
 	gettimeofday(&elapse_t, NULL);
-	memcpy((char *) &user, (char *) &r.ru_utime, sizeof(user));
-	memcpy((char *) &sys, (char *) &r.ru_stime, sizeof(sys));
+	memcpy(&user, &r.ru_utime, sizeof(user));
+	memcpy(&sys, &r.ru_stime, sizeof(sys));
 	if (elapse_t.tv_usec < Save_t.tv_usec)
 	{
 		elapse_t.tv_sec--;

src/backend/utils/activity/backend_status.c

@@ -597,7 +597,7 @@ pgstat_report_activity(BackendState state, const char *cmd_str)
 
 	if (cmd_str != NULL)
 	{
-		memcpy((char *) beentry->st_activity_raw, cmd_str, len);
+		memcpy(beentry->st_activity_raw, cmd_str, len);
 		beentry->st_activity_raw[len] = '\0';
 		beentry->st_activity_start_timestamp = start_timestamp;
 	}
@@ -670,7 +670,7 @@ pgstat_report_appname(const char *appname)
 	 */
 	PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
 
-	memcpy((char *) beentry->st_appname, appname, len);
+	memcpy(beentry->st_appname, appname, len);
 	beentry->st_appname[len] = '\0';
 
 	PGSTAT_END_WRITE_ACTIVITY(beentry);

src/interfaces/ecpg/compatlib/informix.c

@@ -1035,7 +1035,7 @@ ECPG_informix_reset_sqlca(void)
 	if (sqlca == NULL)
 		return;
 
-	memcpy((char *) sqlca, (char *) &sqlca_init, sizeof(struct sqlca_t));
+	memcpy(sqlca, &sqlca_init, sizeof(struct sqlca_t));
 }
 
 int

src/interfaces/ecpg/ecpglib/misc.c

@@ -66,7 +66,7 @@ static FILE *debugstream = NULL;
 void
 ecpg_init_sqlca(struct sqlca_t *sqlca)
 {
-	memcpy((char *) sqlca, (char *) &sqlca_init, sizeof(struct sqlca_t));
+	memcpy(sqlca, &sqlca_init, sizeof(struct sqlca_t));
 }
 
 bool
@@ -316,10 +316,10 @@ ECPGset_noind_null(enum ECPGttype type, void *ptr)
 			*((long long *) ptr) = LONG_LONG_MIN;
 			break;
 		case ECPGt_float:
-			memset((char *) ptr, 0xff, sizeof(float));
+			memset(ptr, 0xff, sizeof(float));
 			break;
 		case ECPGt_double:
-			memset((char *) ptr, 0xff, sizeof(double));
+			memset(ptr, 0xff, sizeof(double));
 			break;
 		case ECPGt_varchar:
 			*(((struct ECPGgeneric_varchar *) ptr)->arr) = 0x00;
@@ -329,18 +329,18 @@ ECPGset_noind_null(enum ECPGttype type, void *ptr)
 			((struct ECPGgeneric_bytea *) ptr)->len = 0;
 			break;
 		case ECPGt_decimal:
-			memset((char *) ptr, 0, sizeof(decimal));
+			memset(ptr, 0, sizeof(decimal));
 			((decimal *) ptr)->sign = NUMERIC_NULL;
 			break;
 		case ECPGt_numeric:
-			memset((char *) ptr, 0, sizeof(numeric));
+			memset(ptr, 0, sizeof(numeric));
 			((numeric *) ptr)->sign = NUMERIC_NULL;
 			break;
 		case ECPGt_interval:
-			memset((char *) ptr, 0xff, sizeof(interval));
+			memset(ptr, 0xff, sizeof(interval));
 			break;
 		case ECPGt_timestamp:
-			memset((char *) ptr, 0xff, sizeof(timestamp));
+			memset(ptr, 0xff, sizeof(timestamp));
 			break;
 		default:
 			break;

src/interfaces/libpq/fe-lobj.c

@@ -870,7 +870,7 @@ lo_initialize(PGconn *conn)
 		libpq_append_conn_error(conn, "out of memory");
 		return -1;
 	}
-	MemSet((char *) lobjfuncs, 0, sizeof(PGlobjfuncs));
+	MemSet(lobjfuncs, 0, sizeof(PGlobjfuncs));
 
 	/*
 	 * Execute the query to get all the functions at once.  (Not all of them

src/interfaces/libpq/fe-secure-gssapi.c

@@ -698,7 +698,7 @@ pqsecure_open_gss(PGconn *conn)
 	/* Queue the token for writing */
 	netlen = pg_hton32(output.length);
 
-	memcpy(PqGSSSendBuffer, (char *) &netlen, sizeof(uint32));
+	memcpy(PqGSSSendBuffer, &netlen, sizeof(uint32));
 	PqGSSSendLength += sizeof(uint32);
 
 	memcpy(PqGSSSendBuffer + PqGSSSendLength, output.value, output.length);