#+TITLE: Error handling
#+SETUPFILE: ../docs/theme.setup

  This file is written in C because it is more natural to express the
  error handling in C than in Fortran.

** Headers                                                         :noexport:

  #+NAME: filename
  #+begin_src elisp tangle: no 
(file-name-nondirectory (substring buffer-file-name 0 -4))
  #+end_src

   #+begin_src c :tangle (eval c)
#include <stdint.h>
#include "qmckl_error.h"
   #+end_src

   #+begin_src c :tangle (eval c_test) :noweb yes
#include "qmckl.h"
#include "munit.h"
MunitResult test_<<filename()>>() {
   #+end_src

** Error handling

   The library should never make the calling programs abort, nor
   perform any input/output operations. This decision has to be taken
   by the developer of the code calling the library.
    
   All the functions return with an <<<exit code>>>, defined as
   #+NAME: type-exit-code
   #+begin_src c :comments org :tangle (eval h)
typedef int32_t qmckl_exit_code;
   #+end_src

   The exit code returns the completion status of the function to the
   calling program. When a function call completed successfully, the
   ~QMCKL_SUCCESS~ exit code is returned. If one of the functions of
   the library fails to complete the requested task, an appropriate
   error code is returned to the program.

   Here is the complete list of exit codes.

   #+NAME: table-exit-codes
   | ~QMCKL_SUCCESS~           |   0 |
   | ~QMCKL_INVALID_ARG_1~     |   1 |
   | ~QMCKL_INVALID_ARG_2~     |   2 |
   | ~QMCKL_INVALID_ARG_3~     |   3 |
   | ~QMCKL_INVALID_ARG_4~     |   4 |
   | ~QMCKL_INVALID_ARG_5~     |   5 |
   | ~QMCKL_INVALID_ARG_6~     |   6 |
   | ~QMCKL_INVALID_ARG_7~     |   7 |
   | ~QMCKL_INVALID_ARG_8~     |   8 |
   | ~QMCKL_INVALID_ARG_9~     |   9 |
   | ~QMCKL_INVALID_ARG_10~    |  10 |
   | ~QMCKL_NULL_CONTEXT~      | 101 |
   | ~QMCKL_FAILURE~           | 102 |
   | ~QMCKL_ERRNO~             | 103 |
   | ~QMCKL_INVALID_EXIT_CODE~ | 104 |

   # We need to force Emacs not to indent the Python code:
   # -*- org-src-preserve-indentation: t 
   #+begin_src python :var table=table-exit-codes :results drawer :exports result
""" This script generates the C and Fortran constants for the error
    codes from the org-mode table.
"""

result = [ "#+begin_src c :comments org :tangle (eval h)" ] 
for (text, code) in table:
    text=text.replace("~","")
    result += [ f"#define  {text:30s} {code:d}" ]
result += [ "#+end_src" ]
    
result += [ "" ] 

result += [ "#+begin_src f90 :comments org :tangle (eval fh)" ]
for (text, code) in table:
    text=text.replace("~","")
    result += [ f"   integer, parameter :: {text:30s} = {code:d}" ]
result += [ "#+end_src" ]

return '\n'.join(result)

   #+end_src

   #+RESULTS:
   :results:
   #+begin_src c :comments org :tangle (eval h)
   #define  QMCKL_SUCCESS                  0
   #define  QMCKL_INVALID_ARG_1            1
   #define  QMCKL_INVALID_ARG_2            2
   #define  QMCKL_INVALID_ARG_3            3
   #define  QMCKL_INVALID_ARG_4            4
   #define  QMCKL_INVALID_ARG_5            5
   #define  QMCKL_INVALID_ARG_6            6
   #define  QMCKL_INVALID_ARG_7            7
   #define  QMCKL_INVALID_ARG_8            8
   #define  QMCKL_INVALID_ARG_9            9
   #define  QMCKL_INVALID_ARG_10           10
   #define  QMCKL_NULL_CONTEXT             101
   #define  QMCKL_FAILURE                  102
   #define  QMCKL_ERRNO                    103
   #define  QMCKL_INVALID_EXIT_CODE        104
   #+end_src

   #+begin_src f90 :comments org :tangle (eval fh)
      integer, parameter :: QMCKL_SUCCESS                  = 0
      integer, parameter :: QMCKL_INVALID_ARG_1            = 1
      integer, parameter :: QMCKL_INVALID_ARG_2            = 2
      integer, parameter :: QMCKL_INVALID_ARG_3            = 3
      integer, parameter :: QMCKL_INVALID_ARG_4            = 4
      integer, parameter :: QMCKL_INVALID_ARG_5            = 5
      integer, parameter :: QMCKL_INVALID_ARG_6            = 6
      integer, parameter :: QMCKL_INVALID_ARG_7            = 7
      integer, parameter :: QMCKL_INVALID_ARG_8            = 8
      integer, parameter :: QMCKL_INVALID_ARG_9            = 9
      integer, parameter :: QMCKL_INVALID_ARG_10           = 10
      integer, parameter :: QMCKL_NULL_CONTEXT             = 101
      integer, parameter :: QMCKL_FAILURE                  = 102
      integer, parameter :: QMCKL_ERRNO                    = 103
      integer, parameter :: QMCKL_INVALID_EXIT_CODE        = 104
   #+end_src
   :end:

    
** End of files                                                    :noexport:

*** Test
     #+begin_src c :comments link :tangle (eval c_test)
return MUNIT_OK;
}
     #+end_src

# -*- mode: org -*-
# vim: syntax=c