trunk/Lib/guile/ports.i

/* -----------------------------------------------------------------------------
 * See the LICENSE file for information on copyright, usage and redistribution
 * of SWIG, and the README file for authors - http://www.swig.org/release.html.
 *
 * ports.i
 *
 * Guile typemaps for handling ports
 * ----------------------------------------------------------------------------- */

%{
  #ifndef _POSIX_SOURCE
  /* This is needed on Solaris for fdopen(). */
  #  define _POSIX_SOURCE 199506L
  #endif
  #include <stdio.h>
  #include <errno.h>
  #include <unistd.h>
%}

/* This typemap for FILE * accepts
   (1) FILE * pointer objects,
   (2) Scheme file ports.  In this case, it creates a temporary C stream
       which reads or writes from a dup'ed file descriptor.
 */

%typemap(in, doc="$NAME is a file port or a FILE * pointer") FILE *
  ( int closep )
{
  if (SWIG_ConvertPtr($input, (void**) &($1), $1_descriptor, 0) == 0) {
    closep = 0;
  }
  else if(!(SCM_FPORTP($input)))
    scm_wrong_type_arg("$name", $argnum, $input);
  else {
    int fd;
    if (SCM_OUTPUT_PORT_P($input))
      scm_force_output($input);
    fd=dup(SCM_FPORT_FDES($input));
    if(fd==-1) 
      scm_misc_error("$name", strerror(errno), SCM_EOL);
    $1=fdopen(fd,
		   SCM_OUTPUT_PORT_P($input)
		   ? (SCM_INPUT_PORT_P($input)
		      ? "r+" : "w")
		   : "r");
    if($1==NULL)
      scm_misc_error("$name", strerror(errno), SCM_EOL);
    closep = 1;
  }
}

%typemap(freearg) FILE*  {
  if (closep$argnum)
    fclose($1);
}