/* New getargs implementation */

#include "Python.h"

#include <ctype.h>

int PyArg_Parse(PyObject *, char *, ...);

int PyArg_ParseTuple(PyObject *, char *, ...);

int PyArg_VaParse(PyObject *, char *, va_list);

int PyArg_ParseTupleAndKeywords(PyObject *, PyObject *,

char *, char **, ...);

/* Forward */

static int vgetargs1(PyObject *, char *, va_list *, int);

static void seterror(int, char *, int *, char *, char *);

static char *convertitem(PyObject *, char **, va_list *, int *, char *,

size_t);

static char *converttuple(PyObject *, char **, va_list *,

int *, char *, size_t, int);

static char *convertsimple(PyObject *, char **, va_list *, char *, size_t);

static int convertbuffer(PyObject *, void **p, char **);

static int vgetargskeywords(PyObject *, PyObject *,

char *, char **, va_list *);

static char *skipitem(char **, va_list *);

int

PyArg_Parse(PyObject *args, char *format, ...)

{

int retval;

va_list va;

va_start(va, format);

retval = vgetargs1(args, format, &va, 1);

va_end(va);

return retval;

}

int

PyArg_ParseTuple(PyObject *args, char *format, ...)

{

int retval;

va_list va;

va_start(va, format);

retval = vgetargs1(args, format, &va, 0);

va_end(va);

return retval;

}

int

PyArg_VaParse(PyObject *args, char *format, va_list va)

{

va_list lva;

#ifdef VA_LIST_IS_ARRAY

memcpy(lva, va, sizeof(va_list));

#else

#ifdef __va_copy

__va_copy(lva, va);

#else

lva = va;

#endif

#endif

return vgetargs1(args, format, &lva, 0);

}

static int

vgetargs1(PyObject *args, char *format, va_list *p_va, int compat)

{

char msgbuf[256];

int levels[32];

char *fname = NULL;

char *message = NULL;

int min = -1;

int max = 0;

int level = 0;

int endfmt = 0;

char *formatsave = format;

int i, len;

char *msg;

assert(compat || (args != (PyObject*)NULL));

while (endfmt == 0) {

int c = *format++;

switch (c) {

case '(':

if (level == 0)

max++;

level++;

break;

case ')':

if (level == 0)

Py_FatalError("excess ')' in getargs format");

else

level--;

break;

case '\0':

endfmt = 1;

break;

case ':':

fname = format;

endfmt = 1;

break;

case ';':

message = format;

endfmt = 1;

break;

default:

if (level == 0) {

if (c == 'O')

max++;

else if (isalpha(c)) {

if (c != 'e') /* skip encoded */

max++;

} else if (c == '|')

min = max;

}

break;

}

}

if (level != 0)

Py_FatalError(/* '(' */ "missing ')' in getargs format");

if (min < 0)

min = max;

format = formatsave;

if (compat) {

if (max == 0) {

if (args == NULL)

return 1;

PyOS_snprintf(msgbuf, sizeof(msgbuf),

"%.200s%s takes no arguments",

fname==NULL ? "function" : fname,

fname==NULL ? "" : "()");

PyErr_SetString(PyExc_TypeError, msgbuf);

return 0;

}

else if (min == 1 && max == 1) {

if (args == NULL) {

PyOS_snprintf(msgbuf, sizeof(msgbuf),

"%.200s%s takes at least one argument",

fname==NULL ? "function" : fname,

fname==NULL ? "" : "()");

PyErr_SetString(PyExc_TypeError, msgbuf);

return 0;

}

msg = convertitem(args, &format, p_va, levels, msgbuf,

sizeof(msgbuf));

if (msg == NULL)

return 1;

seterror(levels[0], msg, levels+1, fname, message);

return 0;

}

else {

PyErr_SetString(PyExc_SystemError,

"old style getargs format uses new features");

return 0;

}

}

if (!PyTuple_Check(args)) {

PyErr_SetString(PyExc_SystemError,

"new style getargs format but argument is not a tuple");

return 0;

}

len = PyTuple_GET_SIZE(args);

if (len < min || max < len) {

if (message == NULL) {

PyOS_snprintf(msgbuf, sizeof(msgbuf),

"%.150s%s takes %s %d argument%s "

"(%d given)",

fname==NULL ? "function" : fname,

fname==NULL ? "" : "()",

min==max ? "exactly"

: len < min ? "at least" : "at most",

len < min ? min : max,

(len < min ? min : max) == 1 ? "" : "s",

len);

message = msgbuf;

}

PyErr_SetString(PyExc_TypeError, message);

return 0;

}

for (i = 0; i < len; i++) {

if (*format == '|')

format++;

msg = convertitem(PyTuple_GET_ITEM(args, i), &format, p_va,

levels, msgbuf, sizeof(msgbuf));

if (msg) {

seterror(i+1, msg, levels, fname, message);

return 0;

}

}

if (*format != '\0' && !isalpha((int)(*format)) &&

*format != '(' &&

*format != '|' && *format != ':' && *format != ';') {

PyErr_Format(PyExc_SystemError,

"bad format string: %.200s", formatsave);

return 0;

}

return 1;

}

static void

seterror(int iarg, char *msg, int *levels, char *fname, char *message)

{

char buf[512];

int i;

char *p = buf;

if (PyErr_Occurred())

return;

else if (message == NULL) {

if (fname != NULL) {

PyOS_snprintf(p, sizeof(buf), "%.200s() ", fname);

p += strlen(p);

}

if (iarg != 0) {

PyOS_snprintf(p, sizeof(buf) - (p - buf),

"argument %d", iarg);

i = 0;

p += strlen(p);

while (levels[i] > 0 && (int)(p-buf) < 220) {

PyOS_snprintf(p, sizeof(buf) - (buf - p),

", item %d", levels[i]-1);

p += strlen(p);

i++;

}

}

else {

PyOS_snprintf(p, sizeof(buf) - (p - buf), "argument");

p += strlen(p);

}

PyOS_snprintf(p, sizeof(buf) - (p - buf), " %.256s", msg);

message = buf;

}

PyErr_SetString(PyExc_TypeError, message);

}

/* Convert a tuple argument.

On entry, *p_format points to the character _after_ the opening '('.

On successful exit, *p_format points to the closing ')'.

If successful:

*p_format and *p_va are updated,

*levels and *msgbuf are untouched,

and NULL is returned.

If the argument is invalid:

*p_format is unchanged,

*p_va is undefined,

*levels is a 0-terminated list of item numbers,

*msgbuf contains an error message, whose format is:

"must be <typename1>, not <typename2>", where:

<typename1> is the name of the expected type, and

<typename2> is the name of the actual type,

and msgbuf is returned.

*/

static char *

converttuple(PyObject *arg, char **p_format, va_list *p_va, int *levels,

char *msgbuf, size_t bufsize, int toplevel)

{

int level = 0;

int n = 0;

char *format = *p_format;

int i;

for (;;) {

int c = *format++;

if (c == '(') {

if (level == 0)

n++;

level++;

}

else if (c == ')') {

if (level == 0)

break;

level--;

}

else if (c == ':' || c == ';' || c == '\0')

break;

else if (level == 0 && isalpha(c))

n++;

}

if (!PySequence_Check(arg) || PyString_Check(arg)) {

levels[0] = 0;

PyOS_snprintf(msgbuf, bufsize,

toplevel ? "expected %d arguments, not %.50s" :

"must be %d-item sequence, not %.50s",

n,

arg == Py_None ? "None" : arg->ob_type->tp_name);

return msgbuf;

}

if ((i = PySequence_Size(arg)) != n) {

levels[0] = 0;

PyOS_snprintf(msgbuf, bufsize,

toplevel ? "expected %d arguments, not %d" :

"must be sequence of length %d, not %d",

n, i);

return msgbuf;

}

format = *p_format;

for (i = 0; i < n; i++) {

char *msg;

PyObject *item;

item = PySequence_GetItem(arg, i);

msg = convertitem(item, &format, p_va, levels+1, msgbuf,

bufsize);

/* PySequence_GetItem calls tp->sq_item, which INCREFs */

Py_XDECREF(item);

if (msg != NULL) {

levels[0] = i+1;

return msg;

}

}

*p_format = format;

return NULL;

}

/* Convert a single item. */

static char *

convertitem(PyObject *arg, char **p_format, va_list *p_va, int *levels,

char *msgbuf, size_t bufsize)

{

char *msg;

char *format = *p_format;

if (*format == '(' /* ')' */) {

format++;

msg = converttuple(arg, &format, p_va, levels, msgbuf,

bufsize, 0);

if (msg == NULL)

format++;

}

else {

msg = convertsimple(arg, &format, p_va, msgbuf, bufsize);

if (msg != NULL)

levels[0] = 0;

}

if (msg == NULL)

*p_format = format;

return msg;

}

#define UNICODE_DEFAULT_ENCODING(arg) \

_PyUnicode_AsDefaultEncodedString(arg, NULL)

/* Format an error message generated by convertsimple(). */

static char *

converterr(char *expected, PyObject *arg, char *msgbuf, size_t bufsize)

{

assert(expected != NULL);

assert(arg != NULL);

PyOS_snprintf(msgbuf, bufsize,

"must be %.50s, not %.50s", expected,

arg == Py_None ? "None" : arg->ob_type->tp_name);

return msgbuf;

}

#define CONV_UNICODE "(unicode conversion error)"

/* Convert a non-tuple argument. Return NULL if conversion went OK,

or a string with a message describing the failure. The message is

formatted as "must be <desired type>, not <actual type>".

When failing, an exception may or may not have been raised.

Don't call if a tuple is expected.

*/

static char *

convertsimple(PyObject *arg, char **p_format, va_list *p_va, char *msgbuf,

size_t bufsize)

{

char *format = *p_format;

char c = *format++;

PyObject *uarg;

switch (c) {

case 'b': { /* unsigned byte -- very short int */

char *p = va_arg(*p_va, char *);

long ival = PyInt_AsLong(arg);

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

return converterr("integer<b>", arg, msgbuf, bufsize);

else if (ival < 0) {

PyErr_SetString(PyExc_OverflowError,

"unsigned byte integer is less than minimum");

return converterr("integer<b>", arg, msgbuf, bufsize);

}

else if (ival > UCHAR_MAX) {

PyErr_SetString(PyExc_OverflowError,

"unsigned byte integer is greater than maximum");

return converterr("integer<b>", arg, msgbuf, bufsize);

}

else

*p = (unsigned char) ival;

break;

}

case 'B': {/* byte sized bitfield - both signed and unsigned

values allowed */

char *p = va_arg(*p_va, char *);

long ival = PyInt_AsLong(arg);

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

return converterr("integer<b>", arg, msgbuf, bufsize);

else if (ival < SCHAR_MIN) {

PyErr_SetString(PyExc_OverflowError,

"byte-sized integer bitfield is less than minimum");

return converterr("integer<B>", arg, msgbuf, bufsize);

}

else if (ival > (int)UCHAR_MAX) {

PyErr_SetString(PyExc_OverflowError,

"byte-sized integer bitfield is greater than maximum");

return converterr("integer<B>", arg, msgbuf, bufsize);

}

else

*p = (unsigned char) ival;

break;

}

case 'h': {/* signed short int */

short *p = va_arg(*p_va, short *);

long ival = PyInt_AsLong(arg);

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

return converterr("integer<h>", arg, msgbuf, bufsize);

else if (ival < SHRT_MIN) {

PyErr_SetString(PyExc_OverflowError,

"signed short integer is less than minimum");

return converterr("integer<h>", arg, msgbuf, bufsize);

}

else if (ival > SHRT_MAX) {

PyErr_SetString(PyExc_OverflowError,

"signed short integer is greater than maximum");

return converterr("integer<h>", arg, msgbuf, bufsize);

}

else

*p = (short) ival;

break;

}

case 'H': { /* short int sized bitfield, both signed and

unsigned allowed */

unsigned short *p = va_arg(*p_va, unsigned short *);

long ival = PyInt_AsLong(arg);

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

return converterr("integer<H>", arg, msgbuf, bufsize);

else if (ival < SHRT_MIN) {

PyErr_SetString(PyExc_OverflowError,

"short integer bitfield is less than minimum");

return converterr("integer<H>", arg, msgbuf, bufsize);

}

else if (ival > USHRT_MAX) {

PyErr_SetString(PyExc_OverflowError,

"short integer bitfield is greater than maximum");

return converterr("integer<H>", arg, msgbuf, bufsize);

}

else

*p = (unsigned short) ival;

break;

}

case 'i': {/* signed int */

int *p = va_arg(*p_va, int *);

long ival = PyInt_AsLong(arg);

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

return converterr("integer<i>", arg, msgbuf, bufsize);

else if (ival > INT_MAX) {

PyErr_SetString(PyExc_OverflowError,

"signed integer is greater than maximum");

return converterr("integer<i>", arg, msgbuf, bufsize);

}

else if (ival < INT_MIN) {

PyErr_SetString(PyExc_OverflowError,

"signed integer is less than minimum");

return converterr("integer<i>", arg, msgbuf, bufsize);

}

else

*p = ival;

break;

}

case 'l': {/* long int */

long *p = va_arg(*p_va, long *);

long ival = PyInt_AsLong(arg);

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

return converterr("integer<l>", arg, msgbuf, bufsize);

else

*p = ival;

break;

}

#ifdef HAVE_LONG_LONG

case 'L': {/* LONG_LONG */

LONG_LONG *p = va_arg( *p_va, LONG_LONG * );

LONG_LONG ival = PyLong_AsLongLong( arg );

if( ival == (LONG_LONG)-1 && PyErr_Occurred() ) {

return converterr("long<L>", arg, msgbuf, bufsize);

} else {

*p = ival;

}

break;

}

#endif

case 'f': {/* float */

float *p = va_arg(*p_va, float *);

double dval = PyFloat_AsDouble(arg);

if (PyErr_Occurred())

return converterr("float<f>", arg, msgbuf, bufsize);

else

*p = (float) dval;

break;

}

case 'd': {/* double */

double *p = va_arg(*p_va, double *);

double dval = PyFloat_AsDouble(arg);

if (PyErr_Occurred())

return converterr("float<d>", arg, msgbuf, bufsize);

else

*p = dval;

break;

}

#ifndef WITHOUT_COMPLEX

case 'D': {/* complex double */

Py_complex *p = va_arg(*p_va, Py_complex *);

Py_complex cval;

cval = PyComplex_AsCComplex(arg);

if (PyErr_Occurred())

return converterr("complex<D>", arg, msgbuf, bufsize);

else

*p = cval;

break;

}

#endif /* WITHOUT_COMPLEX */

case 'c': {/* char */

char *p = va_arg(*p_va, char *);

if (PyString_Check(arg) && PyString_Size(arg) == 1)

*p = PyString_AS_STRING(arg)[0];

else

return converterr("char", arg, msgbuf, bufsize);

break;

}

case 's': {/* string */

if (*format == '#') {

void **p = (void **)va_arg(*p_va, char **);

int *q = va_arg(*p_va, int *);

if (PyString_Check(arg)) {

*p = PyString_AS_STRING(arg);

*q = PyString_GET_SIZE(arg);

}

#ifdef Py_USING_UNICODE

else if (PyUnicode_Check(arg)) {

uarg = UNICODE_DEFAULT_ENCODING(arg);

if (uarg == NULL)

return converterr(CONV_UNICODE,

arg, msgbuf, bufsize);

*p = PyString_AS_STRING(uarg);

*q = PyString_GET_SIZE(uarg);

}

#endif

else { /* any buffer-like object */

char *buf;

int count = convertbuffer(arg, p, &buf);

if (count < 0)

return converterr(buf, arg, msgbuf, bufsize);

*q = count;

}

format++;

} else {

char **p = va_arg(*p_va, char **);

if (PyString_Check(arg))

*p = PyString_AS_STRING(arg);

#ifdef Py_USING_UNICODE

else if (PyUnicode_Check(arg)) {

uarg = UNICODE_DEFAULT_ENCODING(arg);

if (uarg == NULL)

return converterr(CONV_UNICODE,

arg, msgbuf, bufsize);

*p = PyString_AS_STRING(uarg);

}

#endif

else

return converterr("string", arg, msgbuf, bufsize);

if ((int)strlen(*p) != PyString_Size(arg))

return converterr("string without null bytes",

arg, msgbuf, bufsize);

}

break;

}

case 'z': {/* string, may be NULL (None) */

if (*format == '#') { /* any buffer-like object */

void **p = (void **)va_arg(*p_va, char **);

int *q = va_arg(*p_va, int *);

if (arg == Py_None) {

*p = 0;

*q = 0;

}

else if (PyString_Check(arg)) {

*p = PyString_AS_STRING(arg);

*q = PyString_GET_SIZE(arg);

}

#ifdef Py_USING_UNICODE

else if (PyUnicode_Check(arg)) {

uarg = UNICODE_DEFAULT_ENCODING(arg);

if (uarg == NULL)

return converterr(CONV_UNICODE,

arg, msgbuf, bufsize);

*p = PyString_AS_STRING(uarg);

*q = PyString_GET_SIZE(uarg);

}

#endif

else { /* any buffer-like object */

char *buf;

int count = convertbuffer(arg, p, &buf);

if (count < 0)

return converterr(buf, arg, msgbuf, bufsize);

*q = count;

}

format++;

} else {

char **p = va_arg(*p_va, char **);

if (arg == Py_None)

*p = 0;

else if (PyString_Check(arg))

*p = PyString_AS_STRING(arg);

#ifdef Py_USING_UNICODE

else if (PyUnicode_Check(arg)) {

uarg = UNICODE_DEFAULT_ENCODING(arg);

if (uarg == NULL)

return converterr(CONV_UNICODE,

arg, msgbuf, bufsize);

*p = PyString_AS_STRING(uarg);

}

#endif

else

return converterr("string or None",

arg, msgbuf, bufsize);

if (*format == '#') {

int *q = va_arg(*p_va, int *);

if (arg == Py_None)

*q = 0;

else

*q = PyString_Size(arg);

format++;

}

else if (*p != NULL &&

(int)strlen(*p) != PyString_Size(arg))

return converterr(

"string without null bytes or None",

arg, msgbuf, bufsize);

}

break;

}

case 'e': {/* encoded string */

char **buffer;

const char *encoding;

PyObject *s;

int size, recode_strings;

/* Get 'e' parameter: the encoding name */

encoding = (const char *)va_arg(*p_va, const char *);

#ifdef Py_USING_UNICODE

if (encoding == NULL)

encoding = PyUnicode_GetDefaultEncoding();

#endif

/* Get output buffer parameter:

's' (recode all objects via Unicode) or

't' (only recode non-string objects)

*/

if (*format == 's')

recode_strings = 1;

else if (*format == 't')

recode_strings = 0;

else

return converterr(

"(unknown parser marker combination)",

arg, msgbuf, bufsize);

buffer = (char **)va_arg(*p_va, char **);

format++;

if (buffer == NULL)

return converterr("(buffer is NULL)",

arg, msgbuf, bufsize);

/* Encode object */

if (!recode_strings && PyString_Check(arg)) {

s = arg;

Py_INCREF(s);

}

else {

#ifdef Py_USING_UNICODE

PyObject *u;

/* Convert object to Unicode */

u = PyUnicode_FromObject(arg);

if (u == NULL)

return converterr(

"string or unicode or text buffer",

arg, msgbuf, bufsize);

/* Encode object; use default error handling */

s = PyUnicode_AsEncodedString(u,

encoding,

NULL);

Py_DECREF(u);

if (s == NULL)

return converterr("(encoding failed)",

arg, msgbuf, bufsize);

if (!PyString_Check(s)) {

Py_DECREF(s);

return converterr(

"(encoder failed to return a string)",

arg, msgbuf, bufsize);

}

#else

return converterr("string<e>", arg, msgbuf, bufsize);

#endif

}

size = PyString_GET_SIZE(s);

/* Write output; output is guaranteed to be 0-terminated */

if (*format == '#') {

/* Using buffer length parameter '#':

- if *buffer is NULL, a new buffer of the

needed size is allocated and the data

copied into it; *buffer is updated to point

to the new buffer; the caller is

responsible for PyMem_Free()ing it after

usage

- if *buffer is not NULL, the data is

copied to *buffer; *buffer_len has to be

set to the size of the buffer on input;

buffer overflow is signalled with an error;

buffer has to provide enough room for the

encoded string plus the trailing 0-byte

- in both cases, *buffer_len is updated to

the size of the buffer /excluding/ the

trailing 0-byte

*/

int *buffer_len = va_arg(*p_va, int *);

format++;

if (buffer_len == NULL)

return converterr(

"(buffer_len is NULL)",

arg, msgbuf, bufsize);

if (*buffer == NULL) {

*buffer = PyMem_NEW(char, size + 1);

if (*buffer == NULL) {

Py_DECREF(s);

return converterr(

"(memory error)",

arg, msgbuf, bufsize);

}

} else {

if (size + 1 > *buffer_len) {

Py_DECREF(s);

return converterr(

"(buffer overflow)",

arg, msgbuf, bufsize);

}

}

memcpy(*buffer,

PyString_AS_STRING(s),

size + 1);

*buffer_len = size;

} else {

/* Using a 0-terminated buffer:

- the encoded string has to be 0-terminated

for this variant to work; if it is not, an

error raised

- a new buffer of the needed size is

allocated and the data copied into it;

*buffer is updated to point to the new

buffer; the caller is responsible for

PyMem_Free()ing it after usage

*/

if ((int)strlen(PyString_AS_STRING(s)) != size)

return converterr(

"(encoded string without NULL bytes)",

arg, msgbuf, bufsize);

*buffer = PyMem_NEW(char, size + 1);

if (*buffer == NULL) {

Py_DECREF(s);

return converterr("(memory error)",

arg, msgbuf, bufsize);

}

memcpy(*buffer,

PyString_AS_STRING(s),

size + 1);

}

Py_DECREF(s);

break;

}

#ifdef Py_USING_UNICODE

case 'u': {/* raw unicode buffer (Py_UNICODE *) */

if (*format == '#') { /* any buffer-like object */

void **p = (void **)va_arg(*p_va, char **);

int *q = va_arg(*p_va, int *);

if (PyUnicode_Check(arg)) {

*p = PyUnicode_AS_UNICODE(arg);

*q = PyUnicode_GET_SIZE(arg);

}

else {

char *buf;

int count = convertbuffer(arg, p, &buf);

if (count < 0)

return converterr(buf, arg, msgbuf, bufsize);

*q = count/(sizeof(Py_UNICODE));

}

format++;

} else {

Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);

if (PyUnicode_Check(arg))

*p = PyUnicode_AS_UNICODE(arg);

else

return converterr("unicode", arg, msgbuf, bufsize);

}

break;

}

#endif

case 'S': { /* string object */

PyObject **p = va_arg(*p_va, PyObject **);

if (PyString_Check(arg))

*p = arg;

else

return converterr("string", arg, msgbuf, bufsize);

break;

}

#ifdef Py_USING_UNICODE

case 'U': { /* Unicode object */

PyObject **p = va_arg(*p_va, PyObject **);

if (PyUnicode_Check(arg))

*p = arg;

else

return converterr("unicode", arg, msgbuf, bufsize);

break;

}

#endif

case 'O': { /* object */

PyTypeObject *type;

PyObject **p;

if (*format == '!') {

type = va_arg(*p_va, PyTypeObject*);

p = va_arg(*p_va, PyObject **);

format++;

if (PyType_IsSubtype(arg->ob_type, type))

*p = arg;

else

return converterr(type->tp_name, arg, msgbuf, bufsize);

}

else if (*format == '?') {

inquiry pred = va_arg(*p_va, inquiry);

p = va_arg(*p_va, PyObject **);

format++;

if ((*pred)(arg))

*p = arg;

else

return converterr("(unspecified)",

arg, msgbuf, bufsize);

}

else if (*format == '&') {

typedef int (*converter)(PyObject *, void *);

converter convert = va_arg(*p_va, converter);

void *addr = va_arg(*p_va, void *);

format++;

if (! (*convert)(arg, addr))

return converterr("(unspecified)",

arg, msgbuf, bufsize);

}

else {

p = va_arg(*p_va, PyObject **);

*p = arg;

}

break;

}

case 'w': { /* memory buffer, read-write access */

void **p = va_arg(*p_va, void **);

PyBufferProcs *pb = arg->ob_type->tp_as_buffer;

int count;

if (pb == NULL ||

pb->bf_getwritebuffer == NULL ||

pb->bf_getsegcount == NULL)

return converterr("read-write buffer", arg, msgbuf, bufsize);

if ((*pb->bf_getsegcount)(arg, NULL) != 1)

return converterr("single-segment read-write buffer",

arg, msgbuf, bufsize);

if ((count = pb->bf_getwritebuffer(arg, 0, p)) < 0)

return converterr("(unspecified)", arg, msgbuf, bufsize);

if (*format == '#') {

int *q = va_arg(*p_va, int *);

*q = count;

format++;

}

break;

}

case 't': { /* 8-bit character buffer, read-only access */

const char **p = va_arg(*p_va, const char **);

PyBufferProcs *pb = arg->ob_type->tp_as_buffer;

int count;

if (*format++ != '#')

return converterr(

"invalid use of 't' format character",

arg, msgbuf, bufsize);

if (!PyType_HasFeature(arg->ob_type,

Py_TPFLAGS_HAVE_GETCHARBUFFER) ||

pb == NULL || pb->bf_getcharbuffer == NULL ||

pb->bf_getsegcount == NULL)

return converterr(

"string or read-only character buffer",

arg, msgbuf, bufsize);

if (pb->bf_getsegcount(arg, NULL) != 1)

return converterr(

"string or single-segment read-only buffer",

arg, msgbuf, bufsize);

count = pb->bf_getcharbuffer(arg, 0, p);

if (count < 0)

return converterr("(unspecified)", arg, msgbuf, bufsize);

*va_arg(*p_va, int *) = count;

break;

}

default:

return converterr("impossible<bad format char>", arg, msgbuf, bufsize);

}

*p_format = format;

return NULL;

}

static int

convertbuffer(PyObject *arg, void **p, char **errmsg)

{

PyBufferProcs *pb = arg->ob_type->tp_as_buffer;

int count;

if (pb == NULL ||

pb->bf_getreadbuffer == NULL ||

pb->bf_getsegcount == NULL) {

*errmsg = "string or read-only buffer";

return -1;

}