fs: extract start and end check into checkPosition

PR-URL: #25264
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: ZYSzys

lib/internal/fs/streams.js

@@ -37,6 +37,19 @@ function allocNewPool(poolSize) {
 pool.used=0;
 }
 
+// Check the `this.start` and `this.end` of stream.
+functioncheckPosition(pos,name){
+if(!Number.isSafeInteger(pos)){
+validateNumber(pos,name);
+if(!Number.isInteger(pos))
+thrownewERR_OUT_OF_RANGE(name,'an integer',pos);
+thrownewERR_OUT_OF_RANGE(name,'>= 0 and <= 2 ** 53 - 1',pos);
+}
+if(pos<0){
+thrownewERR_OUT_OF_RANGE(name,'>= 0 and <= 2 ** 53 - 1',pos);
+}
+}
+
 functionReadStream(path,options){
 if(!(thisinstanceofReadStream))
 returnnewReadStream(path,options);
@@ -65,41 +78,15 @@ function ReadStream(path, options) {
 this.closed=false;
 
 if(this.start!==undefined){
-if(!Number.isSafeInteger(this.start)){
-validateNumber(this.start,'start');
-if(!Number.isInteger(this.start))
-thrownewERR_OUT_OF_RANGE('start','an integer',this.start);
-thrownewERR_OUT_OF_RANGE(
-'start',
-'>= 0 and <= 2 ** 53 - 1',
-this.start
-);
-}
-if(this.start<0){
-thrownewERR_OUT_OF_RANGE(
-'start',
-'>= 0 and <= 2 ** 53 - 1',
-this.start
-);
-}
+checkPosition(this.start,'start');
 
 this.pos=this.start;
 }
 
 if(this.end===undefined){
 this.end=Infinity;
 }elseif(this.end!==Infinity){
-if(!Number.isSafeInteger(this.end)){
-if(typeofthis.end!=='number')
-thrownewERR_INVALID_ARG_TYPE('end','number',this.end);
-if(!Number.isInteger(this.end))
-thrownewERR_OUT_OF_RANGE('end','an integer',this.end);
-thrownewERR_OUT_OF_RANGE('end','>= 0 and <= 2 ** 53 - 1',this.end);
-}
-
-if(this.end<0){
-thrownewERR_OUT_OF_RANGE('end','>= 0 and <= 2 ** 53 - 1',this.end);
-}
+checkPosition(this.end,'end');
 
 if(this.start!==undefined&&this.start>this.end){
 thrownewERR_OUT_OF_RANGE(