6. File input output library

The FIO module exposes C++ FILE * API, file mapping, directory and file stat manipulation routines to Daslang.

All functions and symbols are in “fio” module, use require to get access to it.

require fio

6.1. Type aliases

file = FILE const?

alias for the FILE const?; its there since most file functions expect exactly this type

6.2. Constants

seek_set = 0

constant for fseek which sets the file pointer to the beginning of the file plus the offset.

seek_cur = 1

constant for fseek which sets the file pointer to the current position of the file plus the offset.

seek_end = 2

constant for fseek which sets the file pointer to the end of the file plus the offset.

df_magic = 0x12345678

obsolete. magic number for binary_save and binary_load.

df_header

df_header fields are

magic

uint

size

int

obsolete. header for the fsave and fload which internally use binary_save and binary_load.

6.3. Handled structures

FStat

FStat fields are

is_valid

bool

FStat property operators are

size

uint64 const

atime

builtin::clock

ctime

builtin::clock

mtime

builtin::clock

is_reg

bool const

is_dir

bool const

stat and fstat return file information in this structure.

6.4. Handled types

FILE

Holds system specific FILE type.

6.5. File manipulation

remove(name: string const implicit)

remove returns bool const

argument

argument type

name

string const implicit

deletes file specified by name

rename(old_name: string const implicit; new_name: string const implicit)

rename returns bool const

argument

argument type

old_name

string const implicit

new_name

string const implicit

renames file.

fopen(name: string const implicit; mode: string const implicit)

fopen returns fio::FILE const? const

argument

argument type

name

string const implicit

mode

string const implicit

equivalent to C fopen. Opens file in different modes.

fclose(file: FILE const? const implicit)

argument

argument type

file

fio::FILE const? const implicit

equivalent to C fclose. Closes file.

fflush(file: FILE const? const implicit)

argument

argument type

file

fio::FILE const? const implicit

equivalent to C fflush. Flushes FILE buffers.

fprint(file: FILE const? const implicit; text: string const implicit)

argument

argument type

file

fio::FILE const? const implicit

text

string const implicit

same as print but outputs to file.

fread(file: FILE const? const implicit)

fread returns string const

argument

argument type

file

fio::FILE const? const implicit

reads data from file.

fmap(file: FILE const? const implicit; block: block<(var arg0:array<uint8>#):void> const implicit)

argument

argument type

file

fio::FILE const? const implicit

block

block<(array<uint8>#):void> const implicit

create map view of file, i.e. maps file contents to memory. Data is available as array<uint8> inside the block.

fgets(file: FILE const? const implicit)

fgets returns string const

argument

argument type

file

fio::FILE const? const implicit

equivalent to C fgets. Reads and returns new string from the line.

fwrite(file: FILE const? const implicit; text: string const implicit)

argument

argument type

file

fio::FILE const? const implicit

text

string const implicit

writes data fo file.

feof(file: FILE const? const implicit)

feof returns bool const

argument

argument type

file

fio::FILE const? const implicit

equivalent to C feof. Returns true if end of file has been reached.

fseek(file: FILE const? const implicit; offset: int64 const; mode: int const)

fseek returns int64 const

argument

argument type

file

fio::FILE const? const implicit

offset

int64 const

mode

int const

equivalent to C fseek. Rewinds position of the current FILE pointer.

ftell(file: FILE const? const implicit)

ftell returns int64 const

argument

argument type

file

fio::FILE const? const implicit

equivalent to C ftell. Returns current FILE pointer position.

fstat(file: FILE const? const implicit; stat: FStat implicit)

fstat returns bool const

argument

argument type

file

fio::FILE const? const implicit

stat

fio::FStat implicit

equivalent to C fstat. Returns information about file, such as file size, timestamp, etc.

stat(file: string const implicit; stat: FStat implicit)

stat returns bool const

argument

argument type

file

string const implicit

stat

fio::FStat implicit

same as fstat, but file is specified by file name.

fstdin()

fstdin returns fio::FILE const? const

returns FILE pointer to standard input.

fstdout()

fstdout returns fio::FILE const? const

returns FILE pointer to standard output.

fstderr()

fstderr returns fio::FILE const? const

returns FILE pointer to standard error.

getchar()

getchar returns int const

equivalent to C getchar. Reads and returns next character from standard input.

fload(file: file; size: int const; blk: block<(data:array<uint8> const):void> const)

argument

argument type

file

file

size

int const

blk

block<(data:array<uint8> const):void> const

obsolete. saves data to file.

fopen(name: string const; mode: string const; blk: block<(f:FILE const? const):void> const)

fopen returns auto

argument

argument type

name

string const

mode

string const

blk

block<(f: file ):void> const

equivalent to C fopen. Opens file in different modes.

stat(path: string const)

stat returns fio::FStat

argument

argument type

path

string const

same as fstat, but file is specified by file name.

fstat(f: file)

fstat returns fio::FStat

argument

argument type

f

file

equivalent to C fstat. Returns information about file, such as file size, timestamp, etc.

fread(f: file; blk: block<(data:string const#):auto> const)

fread returns auto

argument

argument type

f

file

blk

block<(data:string const#):auto> const

reads data from file.

fload(f: file; buf: auto(BufType) const)

fload returns auto

argument

argument type

f

file

buf

auto(BufType) const

obsolete. saves data to file.

fsave(f: file; buf: auto(BufType) const)

fsave returns auto

argument

argument type

f

file

buf

auto(BufType) const

obsolete. loads data from file.

fread(f: file; buf: auto(BufType) const implicit)

fread returns auto

argument

argument type

f

file

buf

auto(BufType) const implicit

reads data from file.

fread(f: file; buf: array<auto(BufType)> const implicit)

fread returns auto

argument

argument type

f

file

buf

array<auto(BufType)> const implicit

reads data from file.

fwrite(f: file; buf: auto(BufType) const implicit)

fwrite returns auto

argument

argument type

f

file

buf

auto(BufType) const implicit

writes data fo file.

fwrite(f: file; buf: array<auto(BufType)> const implicit)

fwrite returns auto

argument

argument type

f

file

buf

array<auto(BufType)> const implicit

writes data fo file.

6.6. Path manipulation

dir_name(name: string const implicit)

dir_name returns string const

argument

argument type

name

string const implicit

equivalent to linux dirname. Splits path and returns the component preceding the final ‘/’. Trailing ‘/’ characters are not counted as part of the pathname.

base_name(name: string const implicit)

base_name returns string const

argument

argument type

name

string const implicit

equivalent to linux basename. Splits path and returns the string up to, but not including, the final ‘/’.

get_full_file_name(path: string const implicit)

get_full_file_name returns string const

argument

argument type

path

string const implicit

returns full name of the file in normalized form.

6.7. Directory manipulation

mkdir(path: string const implicit)

mkdir returns bool const

argument

argument type

path

string const implicit

makes directory.

chdir(path: string const implicit)

chdir returns bool const

argument

argument type

path

string const implicit

changes current directory.

getcwd()

getcwd returns string const

returns current working directory.

dir(path: string const; blk: block<(filename:string const):void> const)

dir returns auto

argument

argument type

path

string const

blk

block<(filename:string const):void> const

iterates through all files in the specified path.

6.8. OS specific routines

sleep(msec: uint const)

argument

argument type

msec

uint const

sleeps for specified number of milliseconds.

exit(exitCode: int const)

Warning

This is unsafe operation.

argument

argument type

exitCode

int const

equivalent to C exit. Terminates program.

popen(command: string const implicit; scope: block<(arg0:FILE const? const):void> const implicit)

popen returns int const

Warning

This is unsafe operation.

argument

argument type

command

string const implicit

scope

block<( fio::FILE const? const):void> const implicit

equivalent to linux popen. Opens pipe to command.

popen_binary(command: string const implicit; scope: block<(arg0:FILE const? const):void> const implicit)

popen_binary returns int const

Warning

This is unsafe operation.

argument

argument type

command

string const implicit

scope

block<( fio::FILE const? const):void> const implicit

opens pipe to command and returns FILE pointer to it, in binary mode.

get_env_variable(var: string const implicit)

get_env_variable returns string const

argument

argument type

var

string const implicit

returns value of the environment variable.

has_env_variable(var: string const implicit)

has_env_variable returns bool const

argument

argument type

var

string const implicit

returns true if the environment variable is defined.

sanitize_command_line(var: string const implicit)

sanitize_command_line returns string const

argument

argument type

var

string const implicit

sanitizes command line arguments.