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stdlib_experimental_io.f90
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module stdlib_experimental_io
use iso_fortran_env, only: sp=>real32, dp=>real64, qp=>real128
use stdlib_experimental_error, only: error_stop
implicit none
private
public :: loadtxt, savetxt, open
interface loadtxt
module procedure sloadtxt
module procedure dloadtxt
module procedure qloadtxt
end interface
interface savetxt
module procedure ssavetxt
module procedure dsavetxt
module procedure qsavetxt
end interface
contains
subroutine sloadtxt(filename, d)
! Loads a 2D array from a text file.
!
! Arguments
! ---------
!
! Filename to load the array from
character(len=*), intent(in) :: filename
! The array 'd' will be automatically allocated with the correct dimensions
real(sp), allocatable, intent(out) :: d(:,:)
!
! Example
! -------
!
! real(sp), allocatable :: data(:, :)
! call loadtxt("log.txt", data) ! 'data' will be automatically allocated
!
! Where 'log.txt' contains for example::
!
! 1 2 3
! 2 4 6
! 8 9 10
! 11 12 13
! ...
!
integer :: s
integer :: nrow,ncol,i
s = open(filename)
! determine number of columns
ncol = number_of_columns(s)
! determine number or rows
nrow = number_of_rows_numeric(s)
allocate(d(nrow, ncol))
do i = 1, nrow
read(s, *) d(i, :)
end do
close(s)
end subroutine
subroutine dloadtxt(filename, d)
! Loads a 2D array from a text file.
!
! Arguments
! ---------
!
! Filename to load the array from
character(len=*), intent(in) :: filename
! The array 'd' will be automatically allocated with the correct dimensions
real(dp), allocatable, intent(out) :: d(:,:)
!
! Example
! -------
!
! real(dp), allocatable :: data(:, :)
! call loadtxt("log.txt", data) ! 'data' will be automatically allocated
!
! Where 'log.txt' contains for example::
!
! 1 2 3
! 2 4 6
! 8 9 10
! 11 12 13
! ...
!
integer :: s
integer :: nrow,ncol,i
s = open(filename)
! determine number of columns
ncol = number_of_columns(s)
! determine number or rows
nrow = number_of_rows_numeric(s)
allocate(d(nrow, ncol))
do i = 1, nrow
read(s, *) d(i, :)
end do
close(s)
end subroutine
subroutine qloadtxt(filename, d)
! Loads a 2D array from a text file.
!
! Arguments
! ---------
!
! Filename to load the array from
character(len=*), intent(in) :: filename
! The array 'd' will be automatically allocated with the correct dimensions
real(qp), allocatable, intent(out) :: d(:,:)
!
! Example
! -------
!
! real(qp), allocatable :: data(:, :)
! call loadtxt("log.txt", data) ! 'data' will be automatically allocated
!
! Where 'log.txt' contains for example::
!
! 1 2 3
! 2 4 6
! 8 9 10
! 11 12 13
! ...
!
integer :: s
integer :: nrow,ncol,i
s = open(filename)
! determine number of columns
ncol = number_of_columns(s)
! determine number or rows
nrow = number_of_rows_numeric(s)
allocate(d(nrow, ncol))
do i = 1, nrow
read(s, *) d(i, :)
end do
close(s)
end subroutine
subroutine ssavetxt(filename, d)
! Saves a 2D array into a textfile.
!
! Arguments
! ---------
!
character(len=*), intent(in) :: filename ! File to save the array to
real(sp), intent(in) :: d(:,:) ! The 2D array to save
!
! Example
! -------
!
! real(sp) :: data(3, 2)
! call savetxt("log.txt", data)
integer :: s, i
s = open(filename, "w")
do i = 1, size(d, 1)
write(s, *) d(i, :)
end do
close(s)
end subroutine
subroutine dsavetxt(filename, d)
! Saves a 2D array into a textfile.
!
! Arguments
! ---------
!
character(len=*), intent(in) :: filename ! File to save the array to
real(dp), intent(in) :: d(:,:) ! The 2D array to save
!
! Example
! -------
!
! real(dp) :: data(3, 2)
! call savetxt("log.txt", data)
integer :: s, i
s = open(filename, "w")
do i = 1, size(d, 1)
write(s, *) d(i, :)
end do
close(s)
end subroutine
subroutine qsavetxt(filename, d)
! Saves a 2D array into a textfile.
!
! Arguments
! ---------
!
character(len=*), intent(in) :: filename ! File to save the array to
real(qp), intent(in) :: d(:,:) ! The 2D array to save
!
! Example
! -------
!
! real(dp) :: data(3, 2)
! call savetxt("log.txt", data)
integer :: s, i
s = open(filename, "w")
do i = 1, size(d, 1)
write(s, *) d(i, :)
end do
close(s)
end subroutine
integer function number_of_columns(s)
! determine number of columns
integer,intent(in)::s
integer :: ios
character :: c
logical :: lastwhite
rewind(s)
number_of_columns = 0
lastwhite = .true.
do
read(s, '(a)', advance='no', iostat=ios) c
if (ios /= 0) exit
if (lastwhite .and. .not. whitechar(c)) number_of_columns = number_of_columns + 1
lastwhite = whitechar(c)
end do
rewind(s)
end function
integer function number_of_rows_numeric(s)
! determine number or rows
integer,intent(in)::s
integer :: ios
real::r
rewind(s)
number_of_rows_numeric = 0
do
read(s, *, iostat=ios) r
if (ios /= 0) exit
number_of_rows_numeric = number_of_rows_numeric + 1
end do
rewind(s)
end function
logical function whitechar(char) ! white character
! returns .true. if char is space (32) or tab (9), .false. otherwise
character, intent(in) :: char
if (iachar(char) == 32 .or. iachar(char) == 9) then
whitechar = .true.
else
whitechar = .false.
end if
end function
integer function open(filename, mode) result(u)
! Open a file
!
! To open a file to read:
!
! u = open("somefile.txt") # The default `mode` is "r"
! u = open("somefile.txt", "r")
!
! To open a file to write:
!
! u = open("somefile.txt", "w")
! To append to the end of the file if it exists:
!
! u = open("somefile.txt", "a")
character(*), intent(in) :: filename
character(*), intent(in), optional :: mode
character(:), allocatable :: mode_
mode_ = "r"
if (present(mode)) mode_ = mode
! Note: the Fortran standard says that the default values for `status` and
! `action` are processor dependent, so we have to explicitly set them below
if (mode_ == "r") then
open(newunit=u, file=filename, status="old", action="read")
else if (mode_ == "w") then
open(newunit=u, file=filename, status="replace", action="write")
else if (mode_ == "a") then
open(newunit=u, file=filename, position="append", status="old", &
action="write")
else
call error_stop("Unsupported mode")
end if
end function
end module