[MAPSERVER-USERS] msProcessProjection(): Projection library error.

[Tamas Szekeres]

2008/3/4, Frank Warmerdam <warmerdam at pobox.com>:

>
>  The "no system list" message just means that PROJ was built without support
>  for strerror() - that is HAVE_STRERROR was not defined in the configure.
>  This seems to happen almost all the time (perhaps a problem in the proj
>  configure).
>
>         char *
>  pj_strerrno(int err)
>  {
>      static char note[50];
>
>      if (err > 0)
>  #ifdef HAVE_STRERROR
>          return strerror(err);
>  #else
>      {
>          sprintf(note,"no system list, errno: %d\n", err);
>          return note;
>      }
>  #endif
>      else if (err < 0) {
>          int adjusted_err = - err - 1;
>          if (adjusted_err < (sizeof(pj_err_list) / sizeof(char *)))
>              return(pj_err_list[adjusted_err]);
>          else
>          {
>              sprintf( note, "invalid projection system error (%d)",
>                       err );
>              return note;
>          }
>      } else
>          return NULL;
>  }
>

Frank,

I understand your point about HAVE_STRERROR, but it seems to be quite
unrelated. Is pj_errno = 22 definitely a proper value? I think the err
> 0 is an abnormal case since the proj library normally generates
negative error codes.

I think someday we should also audit proj to be more thread safe as
using thread locals instead of global variables or doing internal
locks instead of a global lock in the external libraries.

Proj is used so frequently that it would be quite inefficient to
increase number the locks around it  in mapserver.

Best regards,

Tamas