File size: Difference between revisions
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alert(event); |
alert(event); |
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}</syntaxhighlight> |
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=={{header|Joy}}== |
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<syntaxhighlight lang="joy">DEFINE filesize == "r" fopen 0 2 fseek pop ftell swap fclose. |
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"input.txt" filesize. |
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"/input.txt" filesize.</syntaxhighlight> |
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=={{header|jq}}== |
=={{header|jq}}== |
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jq -Rs length /input.txt</syntaxhighlight> |
jq -Rs length /input.txt</syntaxhighlight> |
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The -R option causes the file to be read as text, and the -s option causes it to be read as a single string. |
The -R option causes the file to be read as text, and the -s option causes it to be read as a single string. |
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Revision as of 17:55, 11 March 2023
You are encouraged to solve this task according to the task description, using any language you may know.
Verify the size of a file called input.txt for a file in the current working directory, and another one in the file system root.
11l
V size1 = fs:file_size(‘input.txt’)
V size2 = fs:file_size(‘/input.txt’)8086 Assembly
This program runs under MS-DOS.
putch: equ 2 ; Print character
puts: equ 9 ; Print $-terminated string
setdta: equ 1Ah ; Set DTA
stat: equ 4Eh ; Get file info
cpu 8086
bits 16
org 100h
section .text
mov si,curf ; Print file size for 'INPUT.TXT'
call pfsize ; (in current directory),
mov si,rootf ; Then for '\INPUT.TXT' in root directory
;;; Print file name and size for file in DS:SI
pfsize: mov ah,setdta ; Set disc transfer area pointer
mov dx,dta
int 21h
call puts0 ; Print the filename in SI
mov ah,puts ; Print colon and space
mov dx,colspc
int 21h
mov ah,stat ; Find file info
xor cx,cx ; We want a normal file
mov dx,si ; Filename is in SI
int 21h
jnc .ok ; Carry clear = found
mov ah,puts ; Carry set = not found = print 'not found'
mov dx,nofile
int 21h
ret
.ok: les bp,[dta+26] ; 32-bit file size in bytes at DTA+26
mov di,es ; DI:BP = 32-bit file size
mov bx,numbuf ; ASCII number buffer
mov cx,10 ; Divisor (10)
.dgt: xor dx,dx ; 32-bit division (to get digits)
mov ax,di ; can be done with chained DIVs
div cx
mov di,ax
mov ax,bp
div cx
mov bp,ax
add dl,'0' ; DX is now remainder, i.e. digit
dec bx ; Move digit pointer backwards,
mov [bx],dl ; Store ASCII digit,
or ax,di ; If the new divisor is not zero,
jnz .dgt ; then there is another digit.
mov ah,puts ; If so, the number is done,
mov dx,bx ; and we can print it.
int 21h
ret
;;; Print 0-terminated string in SI
puts0: push si ; Save SI register
mov ah,putch ; Print char syscall
.loop: lodsb ; Load character from SI
test al,al ; If zero,
jz .out ; then stop.
mov dl,al ; Tell DOS to print character
int 21h
jmp .loop ; go get another.
.out: pop si ; Restore SI register
ret
section .data
rootf: db '\' ; \INPUT.TXT (for root) and
curf: db 'INPUT.TXT',0 ; INPUT.TXT (for current directory)
nofile: db 'Not found.',13,10,'$' ; "Not found" message
db '0000000000' ; Number output buffer
numbuf: db ' bytes',13,10,'$'
colspc: db ': $' ; Colon and space
section .bss
dta: resb 512 ; Disc transfer area
- Output:
C:\>filesize INPUT.TXT: Not found. \INPUT.TXT: Not found. C:\>echo Hello! > INPUT.TXT C:\>filesize INPUT.TXT: 8 bytes. \INPUT.TXT: 8 bytes. C:\>cd testdir C:\TESTDIR>\filesize INPUT.TXT: Not found. \INPUT.TXT: 8 bytes C:\TESTDIR>echo Goodbye! > INPUT.TXT C:\TESTDIR>\filesize INPUT.TXT: 10 bytes \INPUT.TXT: 8 bytes
Action!
DOS 2.5
DOS 2.5 returns file size in number of sectors. It is required to read the whole file to calculate its size in bytes.
INCLUDE "D2:IO.ACT" ;from the Action! Tool Kit
PROC Dir(CHAR ARRAY filter)
BYTE dev=[1]
CHAR ARRAY line(255)
Close(dev)
Open(dev,filter,6)
DO
InputSD(dev,line)
PrintE(line)
IF line(0)=0 THEN
EXIT
FI
OD
Close(dev)
RETURN
CARD FUNC FileSize(CHAR ARRAY src,dst)
DEFINE BUF_LEN="100"
BYTE dev=[1]
BYTE ARRAY buff(BUF_LEN)
CARD len,size
size=0
Close(dev)
Open(dev,src,4)
DO
len=Bget(dev,buff,BUF_LEN)
size==+len
UNTIL len#BUF_LEN
OD
Close(dev)
RETURN (size)
PROC Main()
CHAR ARRAY filter="D:*.*", fname="D:INPUT.TXT"
CARD size
Put(125) PutE() ;clear screen
PrintF("Dir ""%S""%E",filter)
Dir(filter)
size=FileSize(fname)
PrintF("Size of ""%S"" is %U bytes%E",fname,size)
RETURN- Output:
Dir "D:*.*" DOS SYS 037 DUP SYS 042 INPUT TXT 011 617 FREE SECTORS Size of "D:INPUT.TXT" is 1274 bytes
Sparta DOS X
The Sparta DOS X system stores the size of the file in the directory. The readout of the values is performed with the XIO 39 operation. In the ICAX3, ICAX4, ICAX5 registers values are returned in 24-byte format. Calculation according to the formula: ICAX3 + ICAX4 * 256 + ICAX5 * 65536.
INCLUDE"REAL.ACT" ;from the Action! Tool Kit
proc MAIN()
byte array astring
byte IOCB1=$350,ICAX3=IOCB1+12,ICAX4=IOCB1+13,ICAX5=IOCB1+14
real A,B,C,FLEN
open(1,"D:REAL.ACT",4,0) xio(1,0,39,"D:REAL.ACT") close(1)
IntToReal(ICAX3,FLEN)
IntToReal(ICAX4,A) astring="256" ValR(astring,B) RealMult(A,B,C) RealAdd(FLEN,C,FLEN)
IntToReal(ICAX5,A) astring="65536" ValR(astring,B) RealMult(A,B,C) RealAdd(FLEN,C,FLEN)
print("Size of REAL.ACT is ") printRD(DEVICE,FLEN) printe(" bytes")
return- Output:
Size of D:REAL.ACT is 4995 bytes
Ada
with Ada.Directories; use Ada.Directories;
with Ada.Text_IO; use Ada.Text_IO;
procedure Test_File_Size is
begin
Put_Line (File_Size'Image (Size ("input.txt")) & " bytes");
Put_Line (File_Size'Image (Size ("/input.txt")) & " bytes");
end Test_File_Size;
Note that reference to the root directory, if there is any, is OS specific.
Aime
o_(stat("input.txt", ST_SIZE), "\n");
o_("/Cygwin.ico".stat(ST_SIZE), "\n");ALGOL 68
There is no build in way to find the size of an arbitrary file, especially of the file is a special channel, e.g. a tape device.
Conceptually the procedure
PROC set = (REF FILE file, INT page, line, character)VOID: ~could be used to do a binary search find the last page's page number. And if it is known that every page has the same number of lines, and every line has the same number of char[s], and the character set is not compressible, then the size could be quickly calculated. Otherwise every page, and every line would have to be tallied.
It is probably much easier to use some an operating system library. This library is not part of the standard ALGOL 68 language definition.
Arturo
print volume "input.txt"
print volume "/input.txt"
AutoHotkey
FileGetSize, FileSize, input.txt ; Retrieve the size in bytes.
MsgBox, Size of input.txt is %FileSize% bytes
FileGetSize, FileSize, \input.txt, K ; Retrieve the size in Kbytes.
MsgBox, Size of \input.txt is %FileSize% Kbytes
AWK
@load "filefuncs"
function filesize(name ,fd) {
if ( stat(name, fd) == -1)
return -1 # doesn't exist
else
return fd["size"]
}
BEGIN {
print filesize("input.txt")
print filesize("/input.txt")
}
Some awk's don't have direct access to the filesystem, but can execute system-commands like dir (DOS/Windows) and ls
BEGIN {
# Windows
printf("input.txt\t%s\n", system2var("for %I in (input.txt) do @echo %~zI"))
printf("\input.txt\t%s\n", system2var("for %I in (\input.txt) do @echo %~zI"))
# Non-Windows
printf("input.txt\t%s\n", getline2var("stat --printf=\"%s\" input.txt"))
printf("/input.txt\t%s\n", getline2var("stat --printf=\"%s\" /input.txt"))
}
# Windows system() method
function system2var(command ,tempfile, cmd, out, rec, data, i) {
tempfile = "C:\\TEMP\\TMP.TMP"
cmd = command " > " tempfile
system(cmd)
close(cmd)
while (getline rec < tempfile > 0) {
if ( ++i == 1 )
data = rec
else
data = data "\n" rec
}
return(data)
}
# Non-windows getline method
function getline2var(command ,fish, scale, ship) {
command = command " 2>/dev/null"
while ( (command | getline fish) > 0 ) {
if ( ++scale == 1 )
ship = fish
else
ship = ship "\n" fish
}
close(command)
return ship
}
See also UNIX_Shell]
Axe
If GetCalc("appvINPUT")→I
Disp {I-2}ʳ▶Dec,i
Else
Disp "NOT FOUND",i
EndBaCon
' file size
' Return the entire message, FILELEN returns a NUMBER
FUNCTION printlen$(STRING name$)
IF FILEEXISTS(name$) THEN
RETURN name$ & ": " & STR$(FILELEN(name$))
ELSE
RETURN "file " & name$ & " not found"
END IF
END FUNCTION
PRINT printlen$("input.txt")
PRINT printlen$("/input.txt")- Output:
prompt$ bacon filelen.bac Converting 'filelen.bac'... done, 12 lines were processed in 0.004 seconds. Compiling 'filelen.bac'... cc -c filelen.bac.c cc -o filelen filelen.bac.o -lbacon -lm Done, program 'filelen' ready. prompt$ ./filelen input.txt: 15 file /input.txt not found
Batch File
Outputs file size of the first parameter (you can drag and drop a file in aswell).
@echo off
if not exist "%~1" exit /b 1 & rem If file doesn't exist exit with error code of 1.
for /f %%i in (%~1) do echo %~zi
pause>nulBBC BASIC
file% = OPENIN(@dir$+"input.txt")
IF file% THEN
PRINT "File size = " ; EXT#file%
CLOSE #file%
ENDIF
file% = OPENIN("\input.txt")
IF file% THEN
PRINT "File size = " ; EXT#file%
CLOSE #file%
ENDIF
Bracmat
This solution assumes that the file can be opened for reading. The fil function is the Bracmat interface to the underlying C functions fopen, fclose, fseek, ftell, fread, fgetc, fwrite, fputc and feof. More than one file can be opened at the same time. Focus is shifted from one open file to another by mentioning the file name as the first argument.
(getFileSize=
size
. fil$(!arg,rb) {read in binary mode}
& fil$(,END) {seek to end of file}
& fil$(,TEL):?size {tell where we are}
& fil$(,SET,-1) {seeking to an impossible position closes the file, and fails}
| !size {return the size}
);
getFileSize$"valid.bra"
113622
getFileSize$"c:\\boot.ini"
211C
#include <stdlib.h>
#include <stdio.h>
long getFileSize(const char *filename)
{
long result;
FILE *fh = fopen(filename, "rb");
fseek(fh, 0, SEEK_END);
result = ftell(fh);
fclose(fh);
return result;
}
int main(void)
{
printf("%ld\n", getFileSize("input.txt"));
printf("%ld\n", getFileSize("/input.txt"));
return 0;
}
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
int main(void)
{
struct stat foo;
stat("input.txt", &foo);
printf("%ld\n", foo.st_size);
stat("/input.txt", &foo);
printf("%ld\n", foo.st_size);
return 0;
}
C#
using System;
using System.IO;
class Program
{
static void Main(string[] args)
{
Console.WriteLine(new FileInfo("/input.txt").Length);
Console.WriteLine(new FileInfo("input.txt").Length);
}
}
C++
#include <iostream>
#include <fstream>
std::ios::off_type getFileSize(const char *filename) {
std::ifstream f(filename);
std::ios::pos_type begin = f.tellg();
f.seekg(0, std::ios::end);
std::ios::pos_type end = f.tellg();
return end - begin;
}
int main() {
std::cout << getFileSize("input.txt") << std::endl;
std::cout << getFileSize("/input.txt") << std::endl;
return 0;
}
optimized
#include <iostream>
#include <fstream>
int main()
{
std::cout << std::ifstream("input.txt", std::ios::binary | std::ios::ate).tellg() << "\n"
<< std::ifstream("/input.txt", std::ios::binary | std::ios::ate).tellg() << "\n";
}
C++ 17
#include <filesystem>
#include <iostream>
void print_file_size(const char* filename) {
try {
auto size = std::filesystem::file_size(filename);
std::cout << "Size of file " << filename << " is " << size << " bytes.\n";
} catch (const std::exception& ex) {
std::cerr << ex.what() << '\n';
}
}
int main() {
print_file_size("input.txt");
print_file_size("/input.txt");
}
- Output:
Size of file input.txt is 506 bytes. filesystem error: in file_size: No such file or directory [/input.txt]
Clean
There is not function to get the file size, therefore we seek to the end and query the file pointer position.
import StdEnv
fileSize fileName world
# (ok, file, world) = fopen fileName FReadData world
| not ok = abort "Cannot open file"
# (ok, file) = fseek file 0 FSeekEnd
| not ok = abort "Cannot seek file"
# (size, file) = fposition file
(_, world) = fclose file world
= (size, world)
Start world = fileSize "input.txt" world
Clojure
(require '[clojure.java.io :as io])
(defn show-size [filename]
(println filename "size:" (.length (io/file filename))))
(show-size "input.txt")
(show-size "/input.txt")
COBOL
identification division.
program-id. FileInfo.
data division.
working-storage section.
01 file-name pic x(256).
01 file-size-edited pic zzz,zzz,zzz.
01 file-details.
05 file-size pic x(8) comp-x.
05 file-date.
10 file-day pic x comp-x.
10 file-month pic x comp-x.
10 file-year pic xx comp-x.
05 file-time.
10 file-hour pic x comp-x.
10 file-minute pic x comp-x.
10 file-second pic x comp-x.
10 file-hundredths pic x comp-x.
procedure division.
main.
move "input.txt" to file-name
perform file-info
move "\input.txt" to file-name
perform file-info
stop run
.
file-info.
call "CBL_CHECK_FILE_EXIST"
using file-name, file-details
returning return-code
if return-code = 0
move file-size to file-size-edited
display function trim(file-name) " "
function trim(file-size-edited) " Bytes"
else
display function trim(file-name) " not found!"
end-if
.
ColdFusion
<cfscript>
localFile = getFileInfo(expandpath("input.txt"));
rootFile = getFileInfo("/input.txt");
</cfscript>
<cfoutput>
Size of input.txt is #localFile.size# bytes.
Size of /input.txt is #rootFile.size# bytes.
</cfoutput>Common Lisp
(with-open-file (stream (make-pathname :name "input.txt")
:direction :input
:if-does-not-exist nil)
(print (if stream (file-length stream) 0)))
(with-open-file (stream (make-pathname :directory '(:absolute "") :name "input.txt")
:direction :input
:if-does-not-exist nil)
(print (if stream (file-length stream) 0)))
(osicat-posix:stat-size (osicat-posix:stat #P"input.txt"))
D
import std.file, std.stdio, std.path, std.file, std.stream,
std.mmfile;
void main() {
immutable fileName = "file_size.exe";
try {
writefln("File '%s' has size:", fileName);
writefln("%10d bytes by std.file.getSize (function)",
std.file.getSize(fileName));
writefln("%10d bytes by std.stream (class)",
new std.stream.File(fileName).size);
// mmfile can treat the file as an array in memory.
writefln("%10d bytes by std.mmfile (class)",
new std.mmfile.MmFile(fileName).length);
} catch (Exception e) {
e.msg.writefln;
}
}
- Output:
File 'file_size.exe' has size: 1066164 bytes by std.file.getSize (function) 1066164 bytes by std.stream (class) 1066164 bytes by std.mmfile (class)
Delphi
program SizeOfFile;
{$APPTYPE CONSOLE}
uses SysUtils;
function CheckFileSize(const aFilename: string): Integer;
var
lFile: file of Byte;
begin
AssignFile(lFile, aFilename);
FileMode := 0; {Access file in read only mode}
Reset(lFile);
Result := FileSize(lFile);
CloseFile(lFile);
end;
begin
Writeln('input.txt ', CheckFileSize('input.txt'));
Writeln('\input.txt ', CheckFileSize('\input.txt'));
end.
E
for file in [<file:input.txt>, <file:///input.txt>] {
println(`The size of $file is ${file.length()} bytes.`)
}Eiffel
class
APPLICATION
create
make
feature {NONE} -- Initialization
make
-- Run application.
do
create input_file.make_open_read ("input.txt")
print(input_file.count)
print("%N")
input_file.close
create environment
input_file.make_open_read(environment.root_directory_name + "input.txt")
print(input_file.count)
input_file.close
end
feature -- Access
input_file: PLAIN_TEXT_FILE
environment:EXECUTION_ENVIRONMENT
end
Elena
ELENA 4.x :
import system'io;
import extensions;
public program()
{
console.printLine(File.assign("input.txt").Length);
console.printLine(File.assign("\input.txt").Length)
}Elixir
IO.puts File.stat!("input.txt").size
IO.puts File.stat!("/input.txt").size
Emacs Lisp
This shows nil if no such file since
file-attributes returns nil in that case.
(message "sizes are %s and %s"
(nth 7 (file-attributes "input.txt"))
(nth 7 (file-attributes "/input.txt")))
Erlang
-module(file_size).
-export([file_size/0]).
-include_lib("kernel/include/file.hrl").
file_size() ->
print_file_size("input.txt"),
print_file_size("/input.txt").
print_file_size(Filename) ->
case file:read_file_info(Filename) of
{ok, FileInfo} ->
io:format("~s ~p~n", [Filename, FileInfo#file_info.size]);
{error, _} ->
io:format("~s could not be opened~n",[Filename])
end.
Euphoria
include file.e
function file_size(sequence file_name)
object x
x = dir(file_name)
if sequence(x) and length(x) = 1 then
return x[1][D_SIZE]
else
return -1 -- the file does not exist
end if
end function
procedure test(sequence file_name)
integer size
size = file_size(file_name)
if size < 0 then
printf(1,"%s file does not exist.\n",{file_name})
else
printf(1,"%s size is %d.\n",{file_name,size})
end if
end procedure
test("input.txt") -- in the current working directory
test("/input.txt") -- in the file system rootF#
open NUnit.Framework
open FsUnit
[<Test>]
let ``Validate that the size of the two files is the same`` () =
let local = System.IO.FileInfo(__SOURCE_DIRECTORY__ + "\input.txt")
let root = System.IO.FileInfo(System.IO.Directory.GetDirectoryRoot(__SOURCE_DIRECTORY__) + "input.txt")
local.Length = root.Length |> should be True
Factor
"input.txt" file-info size>> .
1321
"file-does-not-exist.txt" file-info size>>
"Unix system call ``stat'' failed:"...
FBSL
FileLen returns -1 if the file is not found. FileLen will also accept a file handle and give the file length of the open file.
#APPTYPE CONSOLE
print FileLen("sync.log")
print FileLen("\sync.log")
PAUSE
Forth
: .filesize ( addr len -- ) 2dup type ." is "
r/o open-file throw
dup file-size throw <# #s #> type ." bytes long." cr
close-file throw ;
s" input.txt" .filesize
s" /input.txt" .filesize
Fortran
Since Fortran 95 the size of standard external files may be determined simply by using INQUIRE(SIZE=...). The following previous example pertains to FORTRAN 77 and is now superceded.
use :: iso_fortran_env, only : FILE_STORAGE_SIZE
implicit none
character(len=*),parameter :: filename(*)=[character(len=256) :: 'input.txt', '/input.txt']
integer :: file_size, i
do i=1,size(filename)
INQUIRE(FILE=filename(i), SIZE=file_size) ! return -1 if cannot determine file size
write(*,*)'size of file '//trim(filename(i))//' is ',file_size * FILE_STORAGE_SIZE /8,' bytes'
enddo
end
The original example, now obsolete ...
Alas, although there is a statement INQUIRE(FILE="Input.txt",EXIST = ISTHERE, RECL = RL, etc.) whereby a logical variable ISTHERE has a value (output: assigned left-to-right) according to whether a named file (input: assignment right-to-left) exists or not, and the parameter RECL returns the maximum allowed record length for the file, there is no parameter that reports how many records there are in the file so that the file size remains unknowable. Further, the value returned by RECL is not necessarily related to the file itself, but is likely to be a standard value such as 132, a default used when deciding on the line wrap length with free-format output as in WRITE (6,*) stuff but not necessarily being a limit on the length of a line written or read.
Further, in the ASCII world, text files are often implemented as variable-length records with special characters inline as record boundaries, usually one of CR, CRLF, LFCR, or LF. Without knowing which is in use, the storage taken up by them would be unknown. Other file systems may offer different types of disc files with fixed-size records or variable length records with a record length counter, but this is not standard across all computers.
In other words, Fortran does not specify a linkage to the filesystem whereby these details could be revealed, and not all filesystems maintain them anyway.
But if one wrote Fortran on a B6700 system, its F77 compiler offered additional attributes that could be returned via an INQUIRE statement: MAXRECSIZE really was the length of the longest record in the disc file (whether fixed record lengths or variable record lengths), BLOCKSIZE reported the number of records per block of disc space, AREASIZE the size of a disc space allocation area, and AREAS their number, while KIND reveals the code number of the type of file (not via a .txt suffix or whatever). Armed with these values, the file size could be determined in bits, bytes, words (six characters/word), records, blocks and areas.
These facilities were not carried forward into standardised Fortran 90, etc. So, one is stuck with devising a routine that reads all the records of a disc file, counting their length. This is straightforward, but tedious, as in the following fragment:
20 READ (INF,21, END = 30) L !R E A D A R E C O R D - but only its length.
21 FORMAT(Q) !This obviously indicates the record's length.
NRECS = NRECS + 1 !CALL LONGCOUNT(NRECS,1) !C O U N T A R E C O R D.
NNBYTES = NNBYTES + L !CALL LONGCOUNT(NNBYTES,L) !Not counting any CRLF (or whatever) gibberish.
IF (L.LT.RMIN) THEN !Righto, now for the record lengths.
RMIN = L !This one is shorter.
RMINR = NRECS !Where it's at.
ELSE IF (L.GT.RMAX) THEN !Perhaps instead it is longer?
RMAX = L !Longer.
RMAXR = NRECS !Where it's at.
END IF !So much for the lengths.
GO TO 20 !All I wanted to know...
The LONGCOUNT routine uses two 32-bit integers (the first parameter being a two-element array) to deliver a much larger capacity, given modern file size opportunities, but this is unnecessary if INTEGER*8 variables are available. The count will not include any contribution from record splitters such as CR, etc. A file more properly thought of as containing binary data (say, integer or floating-point values) will by chance have a CR or LF bit pattern here and there, and they will be taken as marking record splits when reading a file as being FORMATTED, which is the default setting.
FreeBASIC
' FB 1.05.0 Win64
#include "file.bi"
Print FileLen("input.txt"), FileLen(Environ("SystemRoot") + "\input.txt")
SleepFrink
println[newJava["java.io.File", "input.txt"].length[]]
println[newJava["java.io.File", "/input.txt"].length[]]Gambas
Public Sub Main()
Dim stInfo As Stat = Stat(User.home &/ "input.txt")
Dim stInfo1 As Stat = Stat("/input.txt")
Print User.Home &/ "input.txt = " & stInfo.Size & " bytes"
Print "/input.txt = " & stInfo1.Size & " bytes"
EndOutput:
/home/charlie/input.txt = 121 bytes /input.txt = 32 bytes
Go
package main
import "fmt"
import "os"
func printFileSize(f string) {
if stat, err := os.Stat(f); err != nil {
fmt.Println(err)
} else {
fmt.Println(stat.Size())
}
}
func main() {
printFileSize("input.txt")
printFileSize("/input.txt")
}
Groovy
println new File('index.txt').length();
println new File('/index.txt').length();
Haskell
import System.IO
printFileSize filename = withFile filename ReadMode hFileSize >>= print
main = mapM_ printFileSize ["input.txt", "/input.txt"]
or
import System.Posix.File
printFileSize filename = do stat <- getFileStatus filename
print (fileSize stat)
main = mapM_ printFileSize ["input.txt", "/input.txt"]
HicEst
READ(FILE="input.txt", LENgth=bytes) ! bytes = -1 if not existent
READ(FILE="C:\input.txt", LENgth=bytes) ! bytes = -1 if not existentIcon and Unicon
Icon doesn't support 'stat'; however, information can be obtained by use of the system function to access command line.
every dir := !["./","/"] do {
write("Size of ",f := dir || "input.txt"," = ",stat(f).size) |stop("failure for to stat ",f)
}
Note: Icon and Unicon accept both / and \ for directory separators.
J
require 'files'
fsize 'input.txt';'/input.txt'
Java
import java.io.File;
public class FileSize
{
public static void main ( String[] args )
{
System.out.println("input.txt : " + new File("input.txt").length() + " bytes");
System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
}
}
JavaScript
var fso = new ActiveXObject("Scripting.FileSystemObject");
fso.GetFile('input.txt').Size;
fso.GetFile('c:/input.txt').Size;
The following works in all browsers, including IE10.
var file = document.getElementById("fileInput").files.item(0); //a file input element
if (file) {
var reader = new FileReader();
reader.readAsText(file, "UTF-8");
reader.onload = loadedFile;
reader.onerror = errorHandler;
}
function loadedFile(event) {
var fileString = event.target.result;
alert(fileString.length);
}
function errorHandler(event) {
alert(event);
}
Joy
DEFINE filesize == "r" fopen 0 2 fseek pop ftell swap fclose.
"input.txt" filesize.
"/input.txt" filesize.jq
jq -Rs length input.txt
jq -Rs length /input.txt
The -R option causes the file to be read as text, and the -s option causes it to be read as a single string.
Julia
println(filesize("input.txt"))
println(filesize("/input.txt"))
K
_size "input.txt"
_size "/input.txt"
Kotlin
// version 1.0.6
import java.io.File
fun main(args: Array<String>) {
val paths = arrayOf("input.txt", "c:\\input.txt")
for (path in paths)
println("Length of $path is ${File(path).length()} bytes")
}
Lang
# Load the IO module
# Replace "<pathToIO.lm>" with the location where the io.lm lang module was installed to without "<" and ">"
ln.loadModule(<pathToIO.lm>)
$file1 = [[io]]::fp.openFile(input.txt)
fn.println([[io]]::fp.getSize($file1))
[[io]]::fp.closeFile($file1) # Remember to close files
$file2 = [[io]]::fp.openFile(/input.txt)
fn.println([[io]]::fp.getSize($file2))
[[io]]::fp.closeFile($file2)Lasso
// local to current directory
local(f = file('input.txt'))
handle => { #f->close }
#f->size
// file at file system root
local(f = file('//input.txt'))
handle => { #f->close }
#f->size
Liberty BASIC
'input.txt in current directory
OPEN DefaultDir$ + "/input.txt" FOR input AS #m
PRINT "File size: "; lof(#m)
CLOSE #m
'input.txt in root
OPEN "c:/input.txt" FOR input AS #m
PRINT "File size: "; lof(#m)
CLOSE #mLingo
----------------------------------------
-- Returns file size
-- @param {string} filename
-- @return {integer}
----------------------------------------
on getFileSize (filename)
fp = xtra("fileIO").new()
fp.openFile(filename, 1)
if fp.status() then return 0
len = fp.getLength()
fp.closeFile()
return len
endLiveCode
// root folder
set the defaultfolder to "/"
repeat for each line fline in (the detailed files)
if item 1 of fline is "input.txt" then
put item 2 of fline --bytes
exit repeat
end if
end repeat
// current working dir of stack
put the effective filename of this stack into tPath
set the itemDelimiter to slash
delete last item of tPath
set the defaultfolder to tPath
repeat for each line fline in (the detailed files)
if item 1 of fline is "input.txt" then
put item 2 of fline
exit repeat
end if
end repeatLua
function GetFileSize( filename )
local fp = io.open( filename )
if fp == nil then
return nil
end
local filesize = fp:seek( "end" )
fp:close()
return filesize
end
M2000 Interpreter
Version 12 can convert numbers to string if a string exist in expression. Functions or arithmetic expressions must be in parenthesis (see filelen()). Older versions has to use ; (for print only):
print filename+" has size ";filelen(filename);" bytes"Module ShowFileSize(filename as string) {
if exist(filename) then
print filename+" has size "+(filelen(filename))+" bytes"
else
print filename+ " not exist"
end if
}
ShowFileSize "checkthis.txt"
ShowFileSize "c:\ok.txt"Maple
FileTools:-Size( "input.txt" )FileTools:-Size( "/input.txt" )Mathematica / Wolfram Language
FileByteCount["input.txt"]
FileByteCount[FileNameJoin[{$RootDirectory, "input.txt"}]]
MATLAB / Octave
d1 = dir('input.txt');
d2 = dir('/input.txt');
fprintf('Size of input.txt is %d bytes\n', d1.bytes)
fprintf('Size of /input.txt is %d bytes\n', d2.bytes)
MAXScript
-- Returns filesize in bytes or 0 if the file is missing
getFileSize "index.txt"
getFileSize "\index.txt"Mirah
import java.io.File
puts File.new('file-size.mirah').length()
puts File.new("./#{File.separator}file-size.mirah").length()mIRC Scripting Language
echo -ag $file(input.txt).size bytes
echo -ag $file(C:\input.txt).size bytesModula-3
MODULE FSize EXPORTS Main;
IMPORT IO, Fmt, FS, File, OSError;
VAR fstat: File.Status;
BEGIN
TRY
fstat := FS.Status("input.txt");
IO.Put("Size of input.txt: " & Fmt.LongInt(fstat.size) & "\n");
fstat := FS.Status("/input.txt");
IO.Put("Size of /input.txt: " & Fmt.LongInt(fstat.size) & "\n");
EXCEPT
| OSError.E => IO.Put("ERROR: Could not get file status.\n");
END;
END FSize.Nanoquery
import Nanoquery.IO
println new(File, "input.txt").length()
println new(File, "/input.txt").length()NetRexx
/* NetRexx */
options replace format comments java symbols binary
runSample(arg)
return
-- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
method fileSize(fn) public static returns double
ff = File(fn)
fSize = ff.length()
return fSize
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
method runSample(arg) private static
parse arg files
if files = '' then files = 'input.txt F docs D /input.txt F /docs D'
loop while files.length > 0
parse files fn ft files
select case(ft.upper())
when 'F' then do
ft = 'File'
end
when 'D' then do
ft = 'Directory'
end
otherwise do
ft = 'File'
end
end
sz = fileSize(fn)
say ft ''''fn'''' sz 'bytes.'
end
return- Output:
J:\>nrc fsz
java -cp "c:\netRexx\lib\NetRexxR.jar;c:\netRexx\lib\NetRexxC.jar;.;C:\Program Files\BSF4ooRexx\bsf4ooRexx-v452-20150825-bin.jar;;c:\netrexx\lib\NetRexxF.jar;." -Dnrx.compiler=ecj org.netrexx.process.NetRexxC fsz
NetRexx portable processor 3.04 GA build 4-20150630-1657
Copyright (c) RexxLA, 2011,2015. All rights reserved.
Parts Copyright (c) IBM Corporation, 1995,2008.
Program fsz.nrx
function fileSize(Rexx)
function runSample(Rexx)
Compilation of 'fsz.nrx' successful
J:\>java fsz test.txt
File 'test.txt' 8 bytes.
NewLISP
(println (first (file-info "input.txt")))
(println (first (file-info "/input.txt")))
Nim
import os
echo getFileSize "input.txt"
echo getFileSize "/input.txt"
Objeck
use IO;
...
File("input.txt")->Size()->PrintLine();
File("c:\input.txt")->Size()->PrintLine();Objective-C
NSFileManager *fm = [NSFileManager defaultManager];
// Pre-OS X 10.5
NSLog(@"%llu", [[fm fileAttributesAtPath:@"input.txt" traverseLink:YES] fileSize]);
// OS X 10.5+
NSLog(@"%llu", [[fm attributesOfItemAtPath:@"input.txt" error:NULL] fileSize]);
OCaml
let printFileSize filename =
let ic = open_in filename in
Printf.printf "%d\n" (in_channel_length ic);
close_in ic ;;
printFileSize "input.txt" ;;
printFileSize "/input.txt" ;;
For files greater than max_int, one can use the module Stdlib.LargeFile:
let printLargeFileSize filename =
let ic = open_in filename in
Printf.printf "%Ld\n" (LargeFile.in_channel_length ic);
close_in ic ;;
Alternatively:
#load "unix.cma" ;;
open Unix ;;
Printf.printf "%d\n" (stat "input.txt").st_size ;;
Printf.printf "%d\n" (stat "/input.txt").st_size ;;
The module Unix has also a LargeFile sub-module.
Oforth
File new("input.txt") size println
File new("/input.txt") size printlnooRexx
Parse Version v
Say v
fid='test.txt'
x=sysfiletree(fid,a.)
Say a.0
Say a.1
Say left(copies('123456789.',10),length(a.1))
Parse Var a.1 20 size .
Say 'file size:' size
s=charin(fid,,1000)
Say length(s)
Say 'file' fid
'type' fid- Output:
J:\>rexx sft REXX-ooRexx_4.2.0(MT)_64-bit 6.04 22 Feb 2014 1 7/26/16 3:28p 8 A---- J:\test.txt 123456789.123456789.123456789.123456789.12345678 file size: 8 8 file test.txt 12 34
Oz
declare
[Path] = {Module.link ['x-oz://system/os/Path.ozf']}
in
{Show {Path.size "input.txt"}}
{Show {Path.size "/input.txt"}}Pascal
See Delphi
Perl
my $size1 = -s 'input.txt';
my $size2 = -s '/input.txt';
Or, to be 100% cross-platform:
use File::Spec::Functions qw(catfile rootdir);
my $size1 = -s 'input.txt';
my $size2 = -s catfile rootdir, 'input.txt';
Alternative way to get the size:
my $size1 = (stat 'input.txt')[7]; # builtin stat() returns an array with file size at index 7
my $size2 = (stat '/input.txt')[7];
Phix
function file_size(sequence file_name) object d = dir(file_name) if atom(d) or length(d)!=1 then return -1 end if return d[1][D_SIZE] end function procedure test(sequence file_name) integer size = file_size(file_name) if size<0 then printf(1,"%s file does not exist.\n",{file_name}) else printf(1,"%s size is %d.\n",{file_name,size}) end if end procedure test("input.txt") -- in the current working directory test("/input.txt") -- in the file system root
PHP
<?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>
PicoLisp
(println (car (info "input.txt")))
(println (car (info "/input.txt")))Pike
import Stdio;
int main(){
write(file_size("input.txt") + "\n");
write(file_size("/input.txt") + "\n");
}
PL/I
/* To obtain file size of files in root as well as from current directory. */
test: proc options (main);
declare ch character (1);
declare i fixed binary (31);
declare in1 file record;
/* Open a file in the root directory. */
open file (in1) title ('//asd.log,type(fixed),recsize(1)');
on endfile (in1) go to next1;
do i = 0 by 1;
read file (in1) into (ch);
end;
next1:
put skip list ('file size in root directory =' || trim(i));
close file (in1);
/* Open a file in the current dorectory. */
open file (in1) title ('/asd.txt,type(fixed),recsize(1)');
on endfile (in1) go to next2;
do i = 0 by 1;
read file (in1) into (ch);
end;
next2:
put skip list ('local file size=' || trim(i));
end test;I used differently-named files to prove that local and root directory files were accessed. This program ran with Windows PL/I.
Pop11
;;; prints file size in bytes
sysfilesize('input.txt') =>
sysfilesize('/input.txt') =>PostScript
status returns status information about a file if given a file name. This includes the size in pages (implementation-dependent), the size in bytes, creation and modification time and a final true. The values not needed here are simply poped off the stack.
(input.txt ) print
(input.txt) status pop pop pop = pop
(/input.txt ) print
(/input.txt) status pop pop pop = pop
PowerShell
Get-ChildItem input.txt | Select-Object Name,Length
Get-ChildItem \input.txt | Select-Object Name,Length
PureBasic
Debug FileSize("input.txt")
Debug FileSize("/input.txt")Python
import os
size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')
R
R has a function file.info() in the base package that performs this function. Note that regardless of the OS, R uses forward slashes for the directories.
sizeinwd <- file.info('input.txt')[["size"]]
sizeinroot <- file.info('/input.txt')[["size"]]
Racket
#lang racket
(file-size "input.txt")
(file-size "/input.txt")
Raku
(formerly Perl 6)
say 'input.txt'.IO.s;
say '/input.txt'.IO.s;
Cross-platform version of the second one:
say $*SPEC.rootdir.IO.child("input.txt").s;
RapidQ
File I/O is one of the things where RapidQ differs from standard Basic. RapidQ uses file streams.
Method 1: display file size using file streams
$INCLUDE "rapidq.inc"
DIM file AS QFileStream
FUNCTION fileSize(name$) AS Integer
file.Open(name$, fmOpenRead)
Result = file.Size
file.Close
END FUNCTION
PRINT "Size of input.txt is "; fileSize("input.txt")
PRINT "Size of \input.txt is "; fileSize("\input.txt")Method 2: using DIR$
FileName$ = DIR$("input.txt", 0)
PRINT "Size of input.txt is "; FileRec.Size
FileName$ = DIR$("\input.txt", 0)
PRINT "Size of \input.txt is "; FileRec.SizeRaven
'input.txt' status.size
'/input.txt' status.sizeREBOL
size? %info.txt
size? %/info.txt
size? ftp://username:password@ftp.site.com/info.txt
size? http://rosettacode.org
Red
>> size? %input.txt
== 39244
>> size? %/c/input.txt
== 39244
Retro
The simple way is to open and read the size. This may crash if the file does not exist.
with files'
"input.txt" :R open &size sip close drop putn
"/input.txt" :R open &size sip close drop putnFor added stability, check that the returned file handle is not zero:
with files'
"input.txt" :R open over 0 <> [ &size sip close drop ] ifTrueOr, if you need to do this more often, setup a function that'll also display an error message if the file does not exist:
with files'
: getFileSize ( $-n )
:R open 0 over =
[ "File does Not Exist\n" puts ]
[ &size sip close drop ] if ;
"input.txt" getFileSize putn
"/input.txt" getFileSize putnREXX
MS DOS version 1
This REXX example was executed on a Windows/XP and also a Windows 7 system (in a DOS window), and
it reports the file's size (in bytes) for both of the required files.
Various REXXes were used for testing: Regina, PERSONAL REXX, PC/REXX, and R4.
Note that some operating systems don't have a concept of a current directory or a file system root.
/*REXX program determines a file's size (by reading all the data) in current dir & root.*/
parse arg iFID . /*allow the user specify the file ID. */
if iFID=='' | iFID=="," then iFID='input.txt' /*Not specified? Then use the default.*/
say 'size of 'iFID "=" fSize(iFID) 'bytes' /*the current directory.*/
say 'size of \..\'iFID "=" fSize('\..\'iFID) 'bytes' /* " root " */
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
fSize: parse arg f; $=0; do while chars(f)\==0; $ = $ + length( charin( f, , 1e4) )
end /*while*/; call lineout f /*close file.*/
return $
- output when using the default input:
size of input.txt = 40 bytes size of \..\input.txt = 40 bytes
MS DOS version 2
/*REXX pgm to verify a file's size */
parse arg iFID . /*let user specify the file ID. */
if iFID=='' then iFID="FILESIZ.DAT" /*Not specified? Then use default*/
say 'size of' iFID':'
Say chars(ifid) '(CR LF included)'
Call lineout ifid /* close the file */
say filesize(ifid) '(net data)'
Call lineout ifid
exit
filesize: parse arg f;
sz=0;
Do while lines(f)\==0
sz=sz+length(linein(f))
End
return sz
- Output:
size of FILESIZ.DAT: 4 (CR LF included) 2 (net data)
CMS version
Note that CMS hasn't a concept of a root.
Also note that the CMS system doesn't normally support the use of periods (.); it uses blanks instead.
/*REXX program determines a file's size (by reading all the data) on the default mDisk.*/
parse arg iFID /*allow the user specify the file ID. */
if iFID=='' | iFID=="," then iFID= 'INPUT TXT' /*Not specified? Then use the default.*/
say 'size of' iFID "=" fSize(iFID) 'bytes' /*on the default mDisk.*/
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
fSize: parse arg f; $= 0; do while lines(f)\==0; $= $ + length( linein(f) )
end /*while*/
return $
Ring
See len(read('input.txt')) + nl
see len(read('/input.txt')) + nlRuby
size = File.size('input.txt')
size = File.size('/input.txt')
Run BASIC
print fileSize(DefaultDir$,"input.txt") ' current default directory
print fileSize("","input.txt") ' root directory
function fileSize(dir$,file$)
open dir$;"\";file$ FOR input as #f
fileSize = lof(#f) ' Length Of File
close #f
end functionRust
use std::{env, fs, process};
use std::io::{self, Write};
use std::fmt::Display;
fn main() {
let file_name = env::args().nth(1).unwrap_or_else(|| exit_err("No file name supplied", 1));
let metadata = fs::metadata(file_name).unwrap_or_else(|e| exit_err(e, 2));
println!("Size of file.txt is {} bytes", metadata.len());
}
#[inline]
fn exit_err<T: Display>(msg: T, code: i32) -> ! {
writeln!(&mut io::stderr(), "Error: {}", msg).expect("Could not write to stdout");
process::exit(code)
}
}
Scala
import java.io.File
object FileSize extends App {
val name = "pg1661.txt"
println(s"$name : ${new File(name).length()} bytes")
println(s"/$name : ${new File(s"${File.separator}$name").length()} bytes")
}
Scheme
(define (file-size filename)
(call-with-input-file filename (lambda (port)
(let loop ((c (read-char port))
(count 0))
(if (eof-object? c)
count
(loop (read-char port) (+ 1 count)))))))
(file-size "input.txt")
(file-size "/input.txt")
Seed7
$ include "seed7_05.s7i";
const proc: main is func
begin
writeln(fileSize("input.txt"));
writeln(fileSize("/input.txt"));
end func;Sidef
say (Dir.cwd + %f'input.txt' -> size);
say (Dir.root + %f'input.txt' -> size);
Slate
(File newNamed: 'input.txt') fileInfo fileSize.
(File newNamed: '/input.txt') fileInfo fileSize.Smalltalk
(File name: 'input.txt') size printNl.
(File name: '/input.txt') size printNl.
'input.txt' asFilename fileSize
'/input.txt' asFilename fileSize
Standard ML
val size = OS.FileSys.fileSize "input.txt" ;;
val size = OS.FileSys.fileSize "/input.txt" ;
Stata
To get the size in byte of an arbitrary file, use file seek. Just replace input.txt with \input.txt if the file resides in the root directory of the current disk.
file open f using input.txt, read binary
file seek f eof
file seek f query
display r(loc)
file close f
However, what is usually interesting is the size of a datatset. Use describe, either on the currently loaded dataset, or on a dataset on disk. The describe command will print the file size, but it's possible to use stored results as well.
describe using test.dta
display r(N)*r(width)
Tcl
file size input.txt
file size /input.txt
Toka
A trivial method follows:
" input.txt" "R" file.open dup file.size . file.close
" /input.txt" "R" file.open dup file.size . file.closeA better method would be to define a new function that actually checks whether the file exists:
[ "R" file.open
dup 0 <> [ dup file.size . file.close ] ifTrue
drop
] is display-size
" input.txt" display-size
" /input.txt" display-sizeTorqueScript
--Ipquarx June 19th, 10:00 AM
Since TorqueScript cannot set the current working directory, the second part of the task cannot be completed.
TGE Version (Works with all versions containing the basic file i/o):
%File = new FileObject();
%File.openForRead("input.txt");
while(!%File.isEOF())
{
%Length += strLen(%File.readLine());
}
%File.close();
%File.delete();
T3D Version (Only works with T3D):
fileSize("input.txt");TUSCRIPT
$$ MODE TUSCRIPT
-- size of file input.txt
file="input.txt"
ERROR/STOP OPEN (file,READ,-std-)
file_size=BYTES ("input.txt")
ERROR/STOP CLOSE (file)
-- size of file x:/input.txt
ERROR/STOP OPEN (file,READ,x)
file_size=BYTES (file)
ERROR/STOP CLOSE (file)UNIX Shell
An interactive user would run ls -l input.txt /input.txt to see the file sizes. This task is more difficult for a shell script, that must extract each size from command output.
Using ls
ls most likely gets the length from the file's inode.
size1=$(ls -l input.txt | tr -s ' ' | cut -d ' ' -f 5)
size2=$(ls -l /input.txt | tr -s ' ' | cut -d ' ' -f 5)
ls -l reports the size in 5th field, with spaces between fields. tr squeezes spaces (because cut needs one single space between fields), and cut extracts 5th field.
echo "# ls:"
ls -la input.txt
echo "# stat:"
stat input.txt
echo "# Size:"
size1=$(ls -l input.txt | tr -s ' ' | cut -d ' ' -f 5)
size2=$(wc -c < input.txt | tr -d ' ')
echo $size1, $size2
- Output:
Test run at compileonline.com
# ls: -rw-r--r-- 1 apache apache 126 Nov 5 19:02 input.txt # stat: File: `input.txt' Size: 126 Blocks: 8 IO Block: 4096 regular file Device: 700h/1792d Inode: 2195776 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 48/ apache) Gid: ( 48/ apache) Access: 2014-11-05 19:02:25.000000000 -0600 Modify: 2014-11-05 19:02:25.000000000 -0600 Change: 2014-11-05 19:02:25.000000000 -0600 # Size: 126, 126
Using wc
wc may actually read the whole file and count the bytes. Some implementations, like wc.c from GNU coreutils, can optimize wc -c by getting the length from the file's inode.
size1=$(wc -c < input.txt | tr -d ' ')
size2=$(wc -c < /input.txt | tr -d ' ')
The peculiar use of wc -c < file, not wc -c file, is to prevent printing the file's name. Then wc only reports the size. Some versions of wc print spaces before the number; tr deletes all these spaces.
Using BSD stat
BSD has stat(1), a nonstandard command. With stat, a shell script can easily get the file size.
size1=$(stat -f %z input.txt)
size2=$(stat -f %z /input.txt)
Z Shell
# from module 'zsh/stat', load builtin 'zstat'
zmodload -F zsh/stat b:zstat
size1=$(zstat +size input.txt)
size2=$(zstat +size /input.txt)
Ursa
decl file f
f.open "input.txt"
out (size f) endl console
f.close
f.open "/input.txt"
out (size f) endl console
f.closeVBScript
With CreateObject("Scripting.FileSystemObject")
WScript.Echo .GetFile("input.txt").Size
WScript.Echo .GetFile("\input.txt").Size
End With
Vedit macro language
Num_Type(File_Size("input.txt"))
Num_Type(File_Size("/input.txt"))Visual Basic
Option Explicit
----
Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
If InStr(Len(Path), Path, "\") = 0 Then
Path = Path & "\"
End If
On Error Resume Next 'otherwise runtime error if file does not exist
i = FileLen(Path & Filename)
If Err.Number = 0 Then
Debug.Print "file size: " & CStr(i) & " Bytes"
Else
Debug.Print "error: " & Err.Description
End If
End Sub
----
Sub Main()
DisplayFileSize CurDir(), "input.txt"
DisplayFileSize CurDir(), "innputt.txt"
DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub- Output:
file size: 37 Bytes error: file not found file size: 37 Bytes
Visual Basic .NET
Platform: .NET
Dim local As New IO.FileInfo("input.txt")
Console.WriteLine(local.Length)
Dim root As New IO.FileInfo("\input.txt")
Console.WriteLine(root.Length)
Wren
A file called "input.txt" has already been created which contains the string "abcdefghijklmnopqrstuvwxyz".
To check the size of a file in the root, just change "input.txt" to "/input.txt" in the following script.
import "io" for File
var name = "input.txt"
System.print("'%(name)' has a a size of %(File.size(name)) bytes")- Output:
'input.txt' has a a size of 26 bytes
X86 Assembly
; x86_64 linux nasm
section .data
localFileName: db "input.txt", 0
rootFileName: db "/initrd.img", 0
section .text
global _start
_start:
; open file in current dir
mov rax, 2
mov rdi, localFileName
xor rsi, rsi
mov rdx, 0
syscall
push rax
mov rdi, rax ; file descriptior
mov rsi, 0 ; offset
mov rdx, 2 ; whence
mov rax, 8 ; sys_lseek
syscall
; compare result to actual size
cmp rax, 11
jne fail
; close the file
pop rdi
mov rax, 3
syscall
; open file in root dir
mov rax, 2
mov rdi, rootFileName
xor rsi, rsi
mov rdx, 0
syscall
push rax
mov rdi, rax ; file descriptior
mov rsi, 0 ; offset
mov rdx, 2 ; whence
mov rax, 8 ; sys_lseek
syscall
; compare result to actual size
cmp rax, 37722243
jne fail
; close the file
pop rdi
mov rax, 3
syscall
; test successful
mov rax, 60
mov rdi, 0
syscall
; test failed
fail:
mov rax, 60
mov rdi, 1
syscallXPL0
proc ShowSize(FileName);
char FileName; int Size, C;
[Trap(false); \disable abort on error
FSet(FOpen(FileName, 0), ^i);
Size:= 0;
repeat C:= ChIn(3); \reads 2 EOFs before
Size:= Size+1; \ read beyond end-of-file
until GetErr; \ is detected
IntOut(0, Size-2);
CrLf(0);
];
[ShowSize("input.txt");
ShowSize("/input.txt"); \root under Linux
]zkl
File.info("input.txt").println();
File.info("/input.txt").println();-->T(size,creation time,last mod time,isDir,mode), from stat(2)
- Output:
L(391,1393658766,1393658766,False,33156) Exception thrown: NameError(File.info(/input.txt): Could not open)
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