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- /*
- * $Id: cStringIO.c,v 2.16 1999/02/08 17:03:27 guido Exp $
- *
- * Copyright (c) 1996-1998, Digital Creations, Fredericksburg, VA, USA.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- * o Redistributions of source code must retain the above copyright
- * notice, this list of conditions, and the disclaimer that follows.
- *
- * o Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions, and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * o All advertising materials mentioning features or use of this
- * software must display the following acknowledgement:
- *
- * This product includes software developed by Digital Creations
- * and its contributors.
- *
- * o Neither the name of Digital Creations nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- *
- * THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS
- * IS* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
- * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL
- * CREATIONS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
- * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- #
- # If you have questions regarding this software, contact:
- #
- # Digital Creations, L.C.
- # 910 Princess Ann Street
- # Fredericksburge, Virginia 22401
- #
- # info@digicool.com
- #
- # (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.seek(0) # 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"
- "$Id: cStringIO.c,v 2.16 1999/02/08 17:03:27 guido 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, softspace;
- } Oobject;
-
- /* Declarations for objects of type StringI */
-
- typedef struct {
- PyObject_HEAD
- char *buf;
- int pos, string_size;
- 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;
- }
-
- if (position > self->buf_size) {
- self->buf_size*=2;
- if(self->buf_size <= position) self->buf_size=position+1;
- UNLESS(self->buf=(char*)realloc(self->buf,self->buf_size*sizeof(char))) {
- self->buf_size=self->pos=0;
- return PyErr_NoMemory();
- }
- }
- else if(position < 0) position=0;
-
- self->pos=position;
-
- while(--position >= self->string_size) self->buf[position]=0;
-
- 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;
- if (n < 0) n=0;
- }
-
- *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_ParseTuple(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 char O_getval__doc__[] =
- "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"
- ;
-
- static PyObject *
- O_getval(Oobject *self, PyObject *args) {
- PyObject *use_pos=Py_None;
- int s;
-
- use_pos=Py_None;
- UNLESS(PyArg_ParseTuple(args,"|O",&use_pos)) return NULL;
- if(PyObject_IsTrue(use_pos)) {
- s=self->pos;
- if (s > self->string_size) s=self->string_size;
- }
- 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) {
- if (self->string_size > self->pos)
- 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;
-
- 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__[] =
- "writelines(sequence_of_strings): write each string";
- static PyObject *
- O_writelines(Oobject *self, PyObject *args) {
- PyObject *string_module = 0;
- static PyObject *string_joinfields = 0;
-
- UNLESS(PyArg_ParseTuple(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;
- }
-
- {
- PyObject *x = PyObject_CallFunction(string_joinfields,
- "Os", args, "");
- if (x == NULL)
- return NULL;
- args = Py_BuildValue("(O)", x);
- Py_DECREF(x);
- if (args == NULL)
- return NULL;
- x = O_write(self, args);
- Py_DECREF(args);
- return x;
- }
- }
-
- static struct PyMethodDef O_methods[] = {
- {"write", (PyCFunction)O_write, METH_VARARGS, O_write__doc__},
- {"read", (PyCFunction)O_read, METH_VARARGS, O_read__doc__},
- {"readline", (PyCFunction)O_readline, METH_VARARGS, O_readline__doc__},
- {"reset", (PyCFunction)O_reset, METH_VARARGS, O_reset__doc__},
- {"seek", (PyCFunction)O_seek, METH_VARARGS, O_seek__doc__},
- {"tell", (PyCFunction)O_tell, METH_VARARGS, O_tell__doc__},
- {"getvalue", (PyCFunction)O_getval, METH_VARARGS, O_getval__doc__},
- {"truncate", (PyCFunction)O_truncate, METH_VARARGS, O_truncate__doc__},
- {"isatty", (PyCFunction)O_isatty, METH_VARARGS, O_isatty__doc__},
- {"close", (PyCFunction)O_close, METH_VARARGS, O_close__doc__},
- {"flush", (PyCFunction)O_flush, METH_VARARGS, O_flush__doc__},
- {"writelines", (PyCFunction)O_writelines, METH_VARARGS, 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 (strcmp(name, "softspace") == 0) {
- return PyInt_FromLong(self->softspace);
- }
- 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->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;
-
- Py_INCREF(Py_None);
- return Py_None;
- }
-
- static PyObject *
- I_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;
- }
-
- if(position < 0) position=0;
-
- self->pos=position;
-
- Py_INCREF(Py_None);
- return Py_None;
- }
-
- static struct PyMethodDef I_methods[] = {
- {"read", (PyCFunction)O_read, METH_VARARGS, O_read__doc__},
- {"readline", (PyCFunction)O_readline, METH_VARARGS, O_readline__doc__},
- {"reset", (PyCFunction)O_reset, METH_VARARGS, O_reset__doc__},
- {"seek", (PyCFunction)I_seek, METH_VARARGS, O_seek__doc__},
- {"tell", (PyCFunction)O_tell, METH_VARARGS, O_tell__doc__},
- {"getvalue", (PyCFunction)O_getval, METH_VARARGS, O_getval__doc__},
- {"truncate", (PyCFunction)O_truncate, METH_VARARGS, O_truncate__doc__},
- {"isatty", (PyCFunction)O_isatty, METH_VARARGS, O_isatty__doc__},
- {"close", (PyCFunction)I_close, METH_VARARGS, O_close__doc__},
- {"flush", (PyCFunction)O_flush, METH_VARARGS, O_flush__doc__},
- {NULL, NULL}
- };
-
- static void
- I_dealloc(Iobject *self) {
- Py_XDECREF(self->pbuf);
- PyMem_DEL(self);
- }
-
- static PyObject *
- I_getattr(Iobject *self, char *name) {
- 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;
-
- 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, "|O", &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,
- };
-
- #ifndef DL_EXPORT /* declarations for DLL import/export */
- #define DL_EXPORT(RTYPE) RTYPE
- #endif
- DL_EXPORT(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");
- }
-