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API with and without null-terminated strings #26

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7a1c5a5
WIP: Add a wrapper precicef_create and a precicec_create expecting n…
MakisH Mar 19, 2024
c43b133
Apply suggestions from code review
MakisH Mar 19, 2024
f35d846
Remove length arguments from precicef_create
MakisH Mar 19, 2024
b6d317a
Remove the sizes from solverdummy.f90
MakisH Mar 19, 2024
e214780
Add .gitignore in example
MakisH Nov 11, 2025
c00e39b
Switch to the Fortran calling convention
MakisH Nov 11, 2025
1fcfba2
Improve style in solverdummy example
MakisH Nov 11, 2025
35079ca
Merge branch 'develop' into nullterminated
MakisH Nov 11, 2025
44007a2
Remove ERROR STOP: needs Fortran 2008
MakisH Nov 11, 2025
3f6fbc0
Remove standard specification from Makefile (unnecessary)
MakisH Nov 11, 2025
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33 changes: 26 additions & 7 deletions precice.f90
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Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,22 @@ module precice
implicit none

interface

! This interface contains subroutines of two kinds:
! - precicec_<name> expect C-style, null-terminated strings and their sizes
! - precicef_<name> automatically convert strings to null-terminated and call
! the corresponding `precicec_<name>`.

subroutine precicef_create(participantName, configFileName, &
& solverProcessIndex, solverProcessSize, &
& participantNameLength, configFileNameLength) &
& bind(c, name='precicef_create_')
subroutine precicec_create(participantName, configFileName, &
& solverProcessIndex, solverProcessSize) &
& bind(c, name='precicec_createParticipant')

use, intrinsic :: iso_c_binding
character(kind=c_char), dimension(*) :: participantName
character(kind=c_char), dimension(*) :: configFileName
integer(kind=c_int) :: solverProcessIndex
integer(kind=c_int) :: solverProcessSize
integer(kind=c_int), value :: participantNameLength
integer(kind=c_int), value :: configFileNameLength
end subroutine precicef_create
end subroutine precicec_create

subroutine precicef_initialize() &
& bind(c, name='precicef_initialize_')
Expand Down Expand Up @@ -312,4 +314,21 @@ end subroutine precicef_get_version_information

end interface

contains

subroutine precicef_create(participantName, configFileName, &
& solverProcessIndex, solverProcessSize)

use, intrinsic :: iso_c_binding, only: c_char, c_int
character(len=*), intent(in) :: participantName
character(len=*), intent(in) :: configFileName
integer(c_int), intent(in) :: solverProcessIndex
integer(c_int), intent(in) :: solverProcessSize

call precicec_create( &
trim(participantName)//c_null_char, &
trim(configFileName)//c_null_char, &
solverProcessIndex, solverProcessSize)
end subroutine precicef_create

end module precice