/*

cStringIO.c,v 1.23 1997/12/04 00:12:05 jim Exp

A simple fast partial StringIO replacement.

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.

Trademarks

Digital Creations & DCLC, are trademarks of Digital Creations, L.C..

All other trademarks are owned by their respective companies.

No Warranty

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

periodically made to the software; these changes will be

incorporated in new editions of the software. DCLC may make

improvements and/or changes in this software at any time

without notice.

Limitation Of Liability

In no event will DCLC be liable for direct, indirect, special,

incidental, economic, cover, or consequential damages arising

out of the use of or inability to use this software even if

advised of the possibility of such damages. Some states do not

allow the exclusion or limitation of implied warranties or

limitation of liability for incidental or consequential

damages, so the above limitation or exclusion may not apply to

you.

If you have questions regarding this software,

contact:

[email protected]

Digital Creations L.C.

(540) 371-6909

*/

static char cStringIO_module_documentation[] =

"A simple fast partial StringIO replacement.\n"

"\n"

"This module provides a simple useful replacement for\n"

"the StringIO module that is written in C. It does not provide the\n"

"full generality if StringIO, but it provides anough for most\n"

"applications and is especially useful in conjuction with the\n"

"pickle module.\n"

"\n"

"Usage:\n"

"\n"

" from cStringIO import StringIO\n"

"\n"

" an_output_stream=StringIO()\n"

" an_output_stream.write(some_stuff)\n"

" ...\n"

" value=an_output_stream.getvalue() # str(an_output_stream) works too!\n"

"\n"

" an_input_stream=StringIO(a_string)\n"

" spam=an_input_stream.readline()\n"

" spam=an_input_stream.read(5)\n"

" an_input_stream.reset() # OK, start over\n"

" spam=an_input_stream.read() # and read it all\n"

" \n"

"If someone else wants to provide a more complete implementation,\n"

"go for it. :-) \n"

"\n"

"cStringIO.c,v 1.23 1997/12/04 00:12:05 jim Exp\n"

;

#include "Python.h"

#include "import.h"

#include "cStringIO.h"

#define UNLESS(E) if(!(E))

/* Declarations for objects of type StringO */

typedef struct {

PyObject_HEAD

char *buf;

int pos, string_size, buf_size, closed, softspace;

} Oobject;

/* Declarations for objects of type StringI */

typedef struct {

PyObject_HEAD

char *buf;

int pos, string_size, closed;

PyObject *pbuf;

} Iobject;

static char O_reset__doc__[] =

"reset() -- Reset the file position to the beginning"

;

static PyObject *

O_reset(Oobject *self, PyObject *args) {

self->pos = 0;

Py_INCREF(Py_None);

return Py_None;

}

static char O_tell__doc__[] =

"tell() -- get the current position.";

static PyObject *

O_tell(Oobject *self, PyObject *args) {

return PyInt_FromLong(self->pos);

}

static char O_seek__doc__[] =

"seek(position) -- set the current position\n"

"seek(position, mode) -- mode 0: absolute; 1: relative; 2: relative to EOF";

static PyObject *

O_seek(Oobject *self, PyObject *args) {

int position, mode = 0;

UNLESS(PyArg_ParseTuple(args, "i|i", &position, &mode)) {

return NULL;

}

if (mode == 2) {

position += self->string_size;

}

else if (mode == 1) {

position += self->pos;

}

self->pos = (position > self->string_size ? self->string_size :

(position < 0 ? 0 : position));

Py_INCREF(Py_None);

return Py_None;

}

static char O_read__doc__[] =

"read([s]) -- Read s characters, or the rest of the string"

;

static int

O_cread(PyObject *self, char **output, int n) {

int l;

l = ((Oobject*)self)->string_size - ((Oobject*)self)->pos;

if (n < 0 || n > l) {

n = l;

}

*output=((Oobject*)self)->buf + ((Oobject*)self)->pos;

((Oobject*)self)->pos += n;

return n;

}

static PyObject *

O_read(Oobject *self, PyObject *args) {

int n = -1;

char *output;

UNLESS(PyArg_ParseTuple(args, "|i", &n)) return NULL;

n=O_cread((PyObject*)self,&output,n);

return PyString_FromStringAndSize(output, n);

}

static char O_readline__doc__[] =

"readline() -- Read one line"

;

static int

O_creadline(PyObject *self, char **output) {

char *n, *s;

int l;

for (n = ((Oobject*)self)->buf + ((Oobject*)self)->pos,

s = ((Oobject*)self)->buf + ((Oobject*)self)->string_size;

n < s && *n != '\n'; n++);

if (n < s) n++;

*output=((Oobject*)self)->buf + ((Oobject*)self)->pos;

l = n - ((Oobject*)self)->buf - ((Oobject*)self)->pos;

((Oobject*)self)->pos += l;

return l;

}

static PyObject *

O_readline(Oobject *self, PyObject *args) {

int n;

char *output;

n=O_creadline((PyObject*)self,&output);

return PyString_FromStringAndSize(output, n);

}

static char O_write__doc__[] =

"write(s) -- Write a string to the file"

"\n\nNote (hack:) writing None resets the buffer"

;

static int

O_cwrite(PyObject *self, char *c, int l) {

int newl;

newl=((Oobject*)self)->pos+l;

if(newl >= ((Oobject*)self)->buf_size) {

((Oobject*)self)->buf_size*=2;

if(((Oobject*)self)->buf_size <= newl) ((Oobject*)self)->buf_size=newl+1;

UNLESS(((Oobject*)self)->buf=

(char*)realloc(((Oobject*)self)->buf,

(((Oobject*)self)->buf_size) *sizeof(char))) {

PyErr_SetString(PyExc_MemoryError,"out of memory");

((Oobject*)self)->buf_size=((Oobject*)self)->pos=0;

return -1;

}

}

memcpy(((Oobject*)((Oobject*)self))->buf+((Oobject*)self)->pos,c,l);

((Oobject*)self)->pos += l;

if (((Oobject*)self)->string_size < ((Oobject*)self)->pos) {

((Oobject*)self)->string_size = ((Oobject*)self)->pos;

}

return l;

}

static PyObject *

O_write(Oobject *self, PyObject *args) {

PyObject *s;

char *c;

int l;

UNLESS(PyArg_Parse(args, "O", &s)) return NULL;

UNLESS(-1 != (l=PyString_Size(s))) return NULL;

UNLESS(c=PyString_AsString(s)) return NULL;

UNLESS(-1 != O_cwrite((PyObject*)self,c,l)) return NULL;

Py_INCREF(Py_None);

return Py_None;

}

static PyObject *

O_getval(Oobject *self, PyObject *args) {

PyObject *use_pos;

int s;

use_pos=Py_None;

UNLESS(PyArg_ParseTuple(args,"|O",&use_pos)) return NULL;

if(PyObject_IsTrue(use_pos)) s=self->pos;

else s=self->string_size;

return PyString_FromStringAndSize(self->buf, s);

}

static PyObject *

O_cgetval(PyObject *self) {

return PyString_FromStringAndSize(((Oobject*)self)->buf,

((Oobject*)self)->pos);

}

static char O_truncate__doc__[] =

"truncate(): truncate the file at the current position.";

static PyObject *

O_truncate(Oobject *self, PyObject *args) {

self->string_size = self->pos;

Py_INCREF(Py_None);

return Py_None;

}

static char O_isatty__doc__[] = "isatty(): always returns 0";

static PyObject *

O_isatty(Oobject *self, PyObject *args) {

return PyInt_FromLong(0);

}

static char O_close__doc__[] = "close(): explicitly release resources held.";

static PyObject *

O_close(Oobject *self, PyObject *args) {

if (self->buf != NULL)

free(self->buf);

self->buf = NULL;

self->pos = self->string_size = self->buf_size = 0;

self->closed = 1;

Py_INCREF(Py_None);

return Py_None;

}

static char O_flush__doc__[] = "flush(): does nothing.";

static PyObject *

O_flush(Oobject *self, PyObject *args) {

Py_INCREF(Py_None);

return Py_None;

}

static char O_writelines__doc__[] = "blah";

static PyObject *

O_writelines(Oobject *self, PyObject *args) {

PyObject *string_module = 0;

static PyObject *string_joinfields = 0;

UNLESS(PyArg_Parse(args, "O", args)) {

return NULL;

}

if (!string_joinfields) {

UNLESS(string_module = PyImport_ImportModule("string")) {

return NULL;

}

UNLESS(string_joinfields=

PyObject_GetAttrString(string_module, "joinfields")) {

return NULL;

}

Py_DECREF(string_module);

}

if (PyObject_Length(args) == -1) {

return NULL;

}

return O_write(self,

PyObject_CallFunction(string_joinfields, "Os", args, ""));

}

static struct PyMethodDef O_methods[] = {

{"write", (PyCFunction)O_write, 0, O_write__doc__},

{"read", (PyCFunction)O_read, 1, O_read__doc__},

{"readline", (PyCFunction)O_readline, 0, O_readline__doc__},

{"reset", (PyCFunction)O_reset, 0, O_reset__doc__},

{"seek", (PyCFunction)O_seek, 1, O_seek__doc__},

{"tell", (PyCFunction)O_tell, 0, O_tell__doc__},

{"getvalue", (PyCFunction)O_getval, 1,

"getvalue([use_pos]) -- Get the string value."

"\n"

"If use_pos is specified and is a true value, then the string returned\n"

"will include only the text up to the current file position.\n"

},

{"truncate", (PyCFunction)O_truncate, 0, O_truncate__doc__},

{"isatty", (PyCFunction)O_isatty, 0, O_isatty__doc__},

{"close", (PyCFunction)O_close, 0, O_close__doc__},

{"flush", (PyCFunction)O_flush, 0, O_flush__doc__},

{"writelines", (PyCFunction)O_writelines, 0, O_writelines__doc__},

{NULL, NULL} /* sentinel */

};

static void

O_dealloc(Oobject *self) {

if (self->buf != NULL)

free(self->buf);

PyMem_DEL(self);

}

static PyObject *

O_getattr(Oobject *self, char *name) {

if (name[0] == 's' && strcmp(name, "softspace") == 0) {

return PyInt_FromLong(self->softspace);

}

else if (name[0] == 'c' && strcmp(name, "closed") == 0) {

return PyInt_FromLong(self->closed);

}

return Py_FindMethod(O_methods, (PyObject *)self, name);

}

static int

O_setattr(Oobject *self, char *name, PyObject *value) {

long x;

if (strcmp(name, "softspace") != 0) {

PyErr_SetString(PyExc_AttributeError, name);

return -1;

}

x = PyInt_AsLong(value);

if (x == -1 && PyErr_Occurred())

return -1;

self->softspace = x;

return 0;

}

static char Otype__doc__[] =

"Simple type for output to strings."

;

static PyTypeObject Otype = {

PyObject_HEAD_INIT(NULL)

0, /*ob_size*/

"StringO", /*tp_name*/

sizeof(Oobject), /*tp_basicsize*/

0, /*tp_itemsize*/

/* methods */

(destructor)O_dealloc, /*tp_dealloc*/

(printfunc)0, /*tp_print*/

(getattrfunc)O_getattr, /*tp_getattr*/

(setattrfunc)O_setattr, /*tp_setattr*/

(cmpfunc)0, /*tp_compare*/

(reprfunc)0, /*tp_repr*/

0, /*tp_as_number*/

0, /*tp_as_sequence*/

0, /*tp_as_mapping*/

(hashfunc)0, /*tp_hash*/

(ternaryfunc)0, /*tp_call*/

(reprfunc)0, /*tp_str*/

/* Space for future expansion */

0L,0L,0L,0L,

Otype__doc__ /* Documentation string */

};

static PyObject *

newOobject(int size) {

Oobject *self;

self = PyObject_NEW(Oobject, &Otype);

if (self == NULL)

return NULL;

self->pos=0;

self->closed = 0;

self->string_size = 0;

self->softspace = 0;

UNLESS(self->buf=malloc(size*sizeof(char))) {

PyErr_SetString(PyExc_MemoryError,"out of memory");

self->buf_size = 0;

return NULL;

}

self->buf_size=size;

return (PyObject*)self;

}

/* End of code for StringO objects */

/* -------------------------------------------------------- */

static PyObject *

I_close(Iobject *self, PyObject *args) {

Py_XDECREF(self->pbuf);

self->pbuf = NULL;

self->pos = self->string_size = 0;

self->closed = 1;

Py_INCREF(Py_None);

return Py_None;

}

static struct PyMethodDef I_methods[] = {

{"read", (PyCFunction)O_read, 1, O_read__doc__},

{"readline", (PyCFunction)O_readline, 0, O_readline__doc__},

{"reset", (PyCFunction)O_reset, 0, O_reset__doc__},

{"seek", (PyCFunction)O_seek, 1, O_seek__doc__},

{"tell", (PyCFunction)O_tell, 0, O_tell__doc__},

{"truncate", (PyCFunction)O_truncate, 0, O_truncate__doc__},

{"isatty", (PyCFunction)O_isatty, 0, O_isatty__doc__},

{"close", (PyCFunction)I_close, 0, O_close__doc__},

{"flush", (PyCFunction)O_flush, 0, O_flush__doc__},

{NULL, NULL} /* sentinel */

};

static void

I_dealloc(Iobject *self) {

Py_XDECREF(self->pbuf);

PyMem_DEL(self);

}

static PyObject *

I_getattr(Iobject *self, char *name) {

if (name[0] == 'c' && strcmp(name,"closed") == 0) {

return PyInt_FromLong(self->closed);

}

return Py_FindMethod(I_methods, (PyObject *)self, name);

}

static char Itype__doc__[] =

"Simple type for treating strings as input file streams"

;

static PyTypeObject Itype = {

PyObject_HEAD_INIT(NULL)

0, /*ob_size*/

"StringI", /*tp_name*/

sizeof(Iobject), /*tp_basicsize*/

0, /*tp_itemsize*/

/* methods */

(destructor)I_dealloc, /*tp_dealloc*/

(printfunc)0, /*tp_print*/

(getattrfunc)I_getattr, /*tp_getattr*/

(setattrfunc)0, /*tp_setattr*/

(cmpfunc)0, /*tp_compare*/

(reprfunc)0, /*tp_repr*/

0, /*tp_as_number*/

0, /*tp_as_sequence*/

0, /*tp_as_mapping*/

(hashfunc)0, /*tp_hash*/

(ternaryfunc)0, /*tp_call*/

(reprfunc)0, /*tp_str*/

/* Space for future expansion */

0L,0L,0L,0L,

Itype__doc__ /* Documentation string */

};

static PyObject *

newIobject(PyObject *s) {

Iobject *self;

char *buf;

int size;

UNLESS(buf=PyString_AsString(s)) return NULL;

UNLESS(-1 != (size=PyString_Size(s))) return NULL;

UNLESS(self = PyObject_NEW(Iobject, &Itype)) return NULL;

Py_INCREF(s);

self->buf=buf;

self->string_size=size;

self->pbuf=s;

self->pos=0;

self->closed = 0;

return (PyObject*)self;

}

/* End of code for StringI objects */

/* -------------------------------------------------------- */

static char IO_StringIO__doc__[] =

"StringIO([s]) -- Return a StringIO-like stream for reading or writing"

;

static PyObject *

IO_StringIO(PyObject *self, PyObject *args) {

PyObject *s=0;

UNLESS(PyArg_ParseTuple(args, "|S", &s)) return NULL;

if(s) return newIobject(s);

return newOobject(128);

}

/* List of methods defined in the module */

static struct PyMethodDef IO_methods[] = {

{"StringIO", (PyCFunction)IO_StringIO, 1, IO_StringIO__doc__},

{NULL, NULL} /* sentinel */

};

/* Initialization function for the module (*must* be called initcStringIO) */

static struct PycStringIO_CAPI CAPI = {

O_cread,

O_creadline,

O_cwrite,

O_cgetval,

newOobject,

newIobject,

&Itype,

&Otype,

};

void

initcStringIO() {

PyObject *m, *d, *v;

/* Create the module and add the functions */

m = Py_InitModule4("cStringIO", IO_methods,

cStringIO_module_documentation,

(PyObject*)NULL,PYTHON_API_VERSION);

/* Add some symbolic constants to the module */

d = PyModule_GetDict(m);

/* Export C API */

Itype.ob_type=&PyType_Type;

Otype.ob_type=&PyType_Type;

PyDict_SetItemString(d,"cStringIO_CAPI",

v = PyCObject_FromVoidPtr(&CAPI,NULL));

Py_XDECREF(v);

/* Export Types */

PyDict_SetItemString(d,"InputType", (PyObject*)&Itype);

PyDict_SetItemString(d,"OutputType", (PyObject*)&Otype);

/* Maybe make certain warnings go away */

if(0) PycString_IMPORT;

/* Check for errors */

if (PyErr_Occurred()) Py_FatalError("can't initialize module cStringIO");

}