mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-29 23:58:39 -05:00
88 lines
3.0 KiB
Fortran
88 lines
3.0 KiB
Fortran
|
module iso_c_utilities
|
||
|
|
|
||
|
|
use, intrinsic :: iso_c_binding, only: c_ptr, c_char, c_f_pointer, c_associated
|
||
|
|
implicit none
|
||
|
|
|
||
|
|
public :: c_to_f_string, c_f_dyn_string
|
||
|
|
|
||
|
|
private
|
||
|
|
|
||
|
|
character(c_char), dimension(1), save, target :: dummy_string = "?"
|
||
|
|
|
||
|
|
interface ! strlen is a standard C function from <string.h>
|
||
|
|
! int strlen(char *string)
|
||
|
|
function strlen (string) result (len) bind (c, name="strlen")
|
||
|
|
use, intrinsic :: iso_c_binding, only: c_ptr, c_size_t
|
||
|
|
implicit none
|
||
|
|
type(c_ptr), value :: string
|
||
|
|
integer(kind=c_size_t) :: len
|
||
|
|
end function strlen
|
||
|
|
|
||
|
|
! void free(void * p)
|
||
|
|
subroutine c_free (p) bind (c, name="free")
|
||
|
|
use, intrinsic :: iso_c_binding, only: c_ptr
|
||
|
|
implicit none
|
||
|
|
type(c_ptr), value :: p
|
||
|
|
end subroutine c_free
|
||
|
|
end interface
|
||
|
|
|
||
|
|
contains
|
||
|
|
|
||
|
|
!
|
||
|
|
! Cast C string pointer to Fortran string pointer
|
||
|
|
!
|
||
|
|
! Warning! - C data must outlive result scope
|
||
|
|
!
|
||
|
|
function c_to_f_string (c_str) result (f_str)
|
||
|
|
use, intrinsic :: iso_c_binding, only: c_ptr, c_f_pointer, c_char
|
||
|
|
implicit none
|
||
|
|
type(c_ptr), intent(in) :: c_str
|
||
|
|
character(kind=c_char, len=:), pointer :: f_str
|
||
|
|
character(kind=c_char), pointer :: arr(:)
|
||
|
|
interface ! strlen is a standard C function from <string.h>
|
||
|
|
! int strlen(char *string)
|
||
|
|
function strlen (string) result (len) bind (c, name="strlen")
|
||
|
|
use, intrinsic :: iso_c_binding, only: c_ptr, c_size_t
|
||
|
|
implicit none
|
||
|
|
type(c_ptr), value :: string
|
||
|
|
integer(kind=c_size_t) :: len
|
||
|
|
end function strlen
|
||
|
|
end interface
|
||
|
|
call c_f_pointer (c_str, arr, [strlen (c_str)])
|
||
|
|
call get_scalar_pointer (size (arr), arr, f_str)
|
||
|
|
end function c_to_f_string
|
||
|
|
|
||
|
|
subroutine get_scalar_pointer (scalar_len, scalar, fptr)
|
||
|
|
! Convert a null-terminated C string into a Fortran character pointer
|
||
|
|
use, intrinsic :: iso_c_binding, only: c_char
|
||
|
|
integer, intent(in) :: scalar_len
|
||
|
|
character(kind=c_char, len=scalar_len), intent(in), target :: scalar(1)
|
||
|
|
character(kind=c_char, len=:), pointer :: fptr
|
||
|
|
fptr => scalar(1)
|
||
|
|
end subroutine get_scalar_pointer
|
||
|
|
|
||
|
|
function c_f_dyn_string (cptr) result (fstr)
|
||
|
|
! Convert a null-terminated malloc'ed C string into a Fortran character array
|
||
|
|
type(c_ptr), intent(in) :: cptr ! The C address
|
||
|
|
character(kind=c_char), allocatable :: fstr(:)
|
||
|
|
character(kind=c_char), pointer :: fptr(:)
|
||
|
|
interface ! strlen is a standard C function from <string.h>
|
||
|
|
! void free(void * p)
|
||
|
|
subroutine c_free (p) bind (c, name="free")
|
||
|
|
use, intrinsic :: iso_c_binding, only: c_ptr
|
||
|
|
implicit none
|
||
|
|
type(c_ptr), value :: p
|
||
|
|
end subroutine c_free
|
||
|
|
end interface
|
||
|
|
if (c_associated (cptr)) then
|
||
|
|
call c_f_pointer (fptr=fptr, cptr=cptr, shape=[strlen(cptr)])
|
||
|
|
else
|
||
|
|
! To avoid segfaults, associate FPTR with a dummy target:
|
||
|
|
fptr => dummy_string
|
||
|
|
end if
|
||
|
|
fstr = fptr
|
||
|
|
call c_free (cptr)
|
||
|
|
end function c_f_dyn_string
|
||
|
|
|
||
|
|
end module
|