Source

cpython / Include / cStringIO.h

#ifndef CSTRINGIO_INCLUDED
#define CSTRINGIO_INCLUDED
/*

  cStringIO.h,v 1.4 1997/12/07 14:27:00 jim Exp

  cStringIO C API

     Copyright 

       Copyright 1996 Digital Creations, L.C., 910 Princess Anne
       Street, Suite 300, Fredericksburg, Virginia 22401 U.S.A. All
       rights reserved.  Copyright in this software is owned by DCLC,
       unless otherwise indicated. Permission to use, copy and
       distribute this software is hereby granted, provided that the
       above copyright notice appear in all copies and that both that
       copyright notice and this permission notice appear. Note that
       any product, process or technology described in this software
       may be the subject of other Intellectual Property rights
       reserved by Digital Creations, L.C. and are not licensed
       hereunder.

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       Digital Creations & DCLC, are trademarks of Digital Creations, L.C..
       All other trademarks are owned by their respective companies. 

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       The software is provided "as is" without warranty of any kind,
       either express or implied, including, but not limited to, the
       implied warranties of merchantability, fitness for a particular
       purpose, or non-infringement. This software could include
       technical inaccuracies or typographical errors. Changes are
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       without notice.

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  This header provides access to cStringIO objects from C.
  Functions are provided for calling cStringIO objects and
  macros are provided for testing whether you have cStringIO 
  objects.

  Before calling any of the functions or macros, you must initialize
  the routines with:

    PycString_IMPORT

  This would typically be done in your init function.

*/

/* Basic functions to manipulate cStringIO objects from C */

static struct PycStringIO_CAPI {
  
  /* Read a string.  If the last argument is -1, the remainder will be read. */
  int(*cread)(PyObject *, char **, int);

  /* Read a line */
  int(*creadline)(PyObject *, char **);

  /* Write a string */
  int(*cwrite)(PyObject *, char *, int);

  /* Get the cStringIO object as a Python string */
  PyObject *(*cgetvalue)(PyObject *);

  /* Create a new output object */
  PyObject *(*NewOutput)(int);

  /* Create an input object from a Python string */
  PyObject *(*NewInput)(PyObject *);

  /* The Python types for cStringIO input and output objects.
     Note that you can do input on an output object.
     */
  PyTypeObject *InputType, *OutputType;

} * PycStringIO = NULL;

/* These can be used to test if you have one */
#define PycStringIO_InputCheck(O) \
  ((O)->ob_type==PycStringIO->InputType)
#define PycStringIO_OutputCheck(O) \
  ((O)->ob_type==PycStringIO->OutputType)

static void *
xxxPyCObject_Import(char *module_name, char *name)
{
  PyObject *m, *c;
  void *r=NULL;
  
  if((m=PyImport_ImportModule(module_name)))
    {
      if((c=PyObject_GetAttrString(m,name)))
	{
	  r=PyCObject_AsVoidPtr(c);
	  Py_DECREF(c);
	}
      Py_DECREF(m);
    }

  return r;
}

#define PycString_IMPORT \
  PycStringIO=xxxPyCObject_Import("cStringIO", "cStringIO_CAPI")

#endif /* CSTRINGIO_INCLUDED */
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