Python/getargs.c

/* New getargs implementation */

#include "Python.h"

#include <ctype.h>


#ifdef __cplusplus
extern "C" {
#endif
int PyArg_Parse(PyObject *, const char *, ...);
int PyArg_ParseTuple(PyObject *, const char *, ...);
int PyArg_VaParse(PyObject *, const char *, va_list);

int PyArg_ParseTupleAndKeywords(PyObject *, PyObject *,
				const char *, char **, ...);
int PyArg_VaParseTupleAndKeywords(PyObject *, PyObject *,
				const char *, char **, va_list);

#ifdef HAVE_DECLSPEC_DLL
/* Export functions */
PyAPI_FUNC(int) _PyArg_Parse_SizeT(PyObject *, char *, ...);
PyAPI_FUNC(int) _PyArg_ParseTuple_SizeT(PyObject *, char *, ...);
PyAPI_FUNC(int) _PyArg_ParseTupleAndKeywords_SizeT(PyObject *, PyObject *,
                                                  const char *, char **, ...);
PyAPI_FUNC(PyObject *) _Py_BuildValue_SizeT(const char *, ...);
PyAPI_FUNC(int) _PyArg_VaParse_SizeT(PyObject *, char *, va_list);
PyAPI_FUNC(int) _PyArg_VaParseTupleAndKeywords_SizeT(PyObject *, PyObject *,
                                              const char *, char **, va_list);
#endif

#define FLAG_COMPAT 1
#define FLAG_SIZE_T 2


/* Forward */
static int vgetargs1(PyObject *, const char *, va_list *, int);
static void seterror(int, const char *, int *, const char *, const char *);
static char *convertitem(PyObject *, const char **, va_list *, int, int *,
                         char *, size_t, PyObject **);
static char *converttuple(PyObject *, const char **, va_list *, int,
			  int *, char *, size_t, int, PyObject **);
static char *convertsimple(PyObject *, const char **, va_list *, int, char *,
			   size_t, PyObject **);
static Py_ssize_t convertbuffer(PyObject *, void **p, char **);
static int getbuffer(PyObject *, Py_buffer *, char**);

static int vgetargskeywords(PyObject *, PyObject *,
			    const char *, char **, va_list *, int);
static char *skipitem(const char **, va_list *, int);

int
PyArg_Parse(PyObject *args, const char *format, ...)
{
	int retval;
	va_list va;

	va_start(va, format);
	retval = vgetargs1(args, format, &va, FLAG_COMPAT);
	va_end(va);
	return retval;
}

int
_PyArg_Parse_SizeT(PyObject *args, char *format, ...)
{
	int retval;
	va_list va;

	va_start(va, format);
	retval = vgetargs1(args, format, &va, FLAG_COMPAT|FLAG_SIZE_T);
	va_end(va);
	return retval;
}


int
PyArg_ParseTuple(PyObject *args, const char *format, ...)
{
	int retval;
	va_list va;

	va_start(va, format);
	retval = vgetargs1(args, format, &va, 0);
	va_end(va);
	return retval;
}

int
_PyArg_ParseTuple_SizeT(PyObject *args, char *format, ...)
{
	int retval;
	va_list va;

	va_start(va, format);
	retval = vgetargs1(args, format, &va, FLAG_SIZE_T);
	va_end(va);
	return retval;
}


int
PyArg_VaParse(PyObject *args, const 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);
}

int
_PyArg_VaParse_SizeT(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, FLAG_SIZE_T);
}


/* Handle cleanup of allocated memory in case of exception */

static int
addcleanup(void *ptr, PyObject **freelist)
{
	PyObject *cobj;
	if (!*freelist) {
		*freelist = PyList_New(0);
		if (!*freelist) {
			PyMem_FREE(ptr);
			return -1;
		}
	}
	cobj = PyCObject_FromVoidPtr(ptr, NULL);
	if (!cobj) {
		PyMem_FREE(ptr);
		return -1;
	}
	if (PyList_Append(*freelist, cobj)) {
                PyMem_FREE(ptr);
		Py_DECREF(cobj);
		return -1;
	}
        Py_DECREF(cobj);
	return 0;
}

static int
cleanreturn(int retval, PyObject *freelist)
{
	if (freelist) {
		if (retval == 0) {
			Py_ssize_t len = PyList_GET_SIZE(freelist), i;
			for (i = 0; i < len; i++)
                                PyMem_FREE(PyCObject_AsVoidPtr(
                                		PyList_GET_ITEM(freelist, i)));
		}
		Py_DECREF(freelist);
	}
	return retval;
}


static int
vgetargs1(PyObject *args, const char *format, va_list *p_va, int flags)
{
	char msgbuf[256];
	int levels[32];
	const char *fname = NULL;
	const char *message = NULL;
	int min = -1;
	int max = 0;
	int level = 0;
	int endfmt = 0;
	const char *formatsave = format;
	Py_ssize_t i, len;
	char *msg;
	PyObject *freelist = NULL;
	int compat = flags & FLAG_COMPAT;

	assert(compat || (args != (PyObject*)NULL));
	flags = flags & ~FLAG_COMPAT;

	while (endfmt == 0) {
		int c = *format++;
		switch (c) {
		case '(':
			if (level == 0)
				max++;
			level++;
			if (level >= 30)
				Py_FatalError("too many tuple nesting levels "
					      "in argument format string");
			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(Py_CHARMASK(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, flags, levels,
					  msgbuf, sizeof(msgbuf), &freelist);
			if (msg == NULL)
				return cleanreturn(1, freelist);
			seterror(levels[0], msg, levels+1, fname, message);
			return cleanreturn(0, freelist);
		}
		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 "
				      "(%ld 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",
				      Py_SAFE_DOWNCAST(len, Py_ssize_t, long));
			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,
				  flags, levels, msgbuf,
				  sizeof(msgbuf), &freelist);
		if (msg) {
			seterror(i+1, msg, levels, fname, message);
			return cleanreturn(0, freelist);
		}
	}

	if (*format != '\0' && !isalpha(Py_CHARMASK(*format)) &&
	    *format != '(' &&
	    *format != '|' && *format != ':' && *format != ';') {
		PyErr_Format(PyExc_SystemError,
			     "bad format string: %.200s", formatsave);
		return cleanreturn(0, freelist);
	}

	return cleanreturn(1, freelist);
}



static void
seterror(int iarg, const char *msg, int *levels, const char *fname,
         const 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 && i < 32 && (int)(p-buf) < 220) {
				PyOS_snprintf(p, sizeof(buf) - (p - buf),
					      ", 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, const char **p_format, va_list *p_va, int flags,
             int *levels, char *msgbuf, size_t bufsize, int toplevel,
             PyObject **freelist)
{
	int level = 0;
	int n = 0;
	const 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(Py_CHARMASK(c)))
			n++;
	}

	if (!PySequence_Check(arg) || PyBytes_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);
		if (item == NULL) {
			PyErr_Clear();
			levels[0] = i+1;
			levels[1] = 0;
			strncpy(msgbuf, "is not retrievable", bufsize);
			return msgbuf;
		}
		msg = convertitem(item, &format, p_va, flags, levels+1,
				  msgbuf, bufsize, freelist);
		/* 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, const char **p_format, va_list *p_va, int flags,
            int *levels, char *msgbuf, size_t bufsize, PyObject **freelist)
{
	char *msg;
	const char *format = *p_format;

	if (*format == '(' /* ')' */) {
		format++;
		msg = converttuple(arg, &format, p_va, flags, levels, msgbuf,
				   bufsize, 0, freelist);
		if (msg == NULL)
			format++;
	}
	else {
		msg = convertsimple(arg, &format, p_va, flags,
				    msgbuf, bufsize, freelist);
		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(const 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)"

/* Explicitly check for float arguments when integers are expected.
   Return 1 for error, 0 if ok. */
static int
float_argument_error(PyObject *arg)
{
	if (PyFloat_Check(arg)) {
		PyErr_SetString(PyExc_TypeError,
				"integer argument expected, got float" );
		return 1;
	}
	else
		return 0;
}

/* 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.

   When you add new format codes, please don't forget poor skipitem() below.
*/

static char *
convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
              char *msgbuf, size_t bufsize, PyObject **freelist)
{
	/* For # codes */
#define FETCH_SIZE	int *q=NULL;Py_ssize_t *q2=NULL;\
	if (flags & FLAG_SIZE_T) q2=va_arg(*p_va, Py_ssize_t*); \
	else q=va_arg(*p_va, int*);
#define STORE_SIZE(s)   if (flags & FLAG_SIZE_T) *q2=s; else *q=s;
#define BUFFER_LEN      ((flags & FLAG_SIZE_T) ? *q2:*q)

	const 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;
		if (float_argument_error(arg))
			return converterr("integer<b>", arg, msgbuf, bufsize);
		ival = PyLong_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;
		if (float_argument_error(arg))
			return converterr("integer<B>", arg, msgbuf, bufsize);
		ival = PyLong_AsUnsignedLongMask(arg);
		if (ival == -1 && PyErr_Occurred())
			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;
		if (float_argument_error(arg))
			return converterr("integer<h>", arg, msgbuf, bufsize);
		ival = PyLong_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;
		if (float_argument_error(arg))
			return converterr("integer<H>", arg, msgbuf, bufsize);
		ival = PyLong_AsUnsignedLongMask(arg);
		if (ival == -1 && PyErr_Occurred())
			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;
		if (float_argument_error(arg))
			return converterr("integer<i>", arg, msgbuf, bufsize);
		ival = PyLong_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 'I': { /* int sized bitfield, both signed and
		       unsigned allowed */
		unsigned int *p = va_arg(*p_va, unsigned int *);
		unsigned int ival;
		if (float_argument_error(arg))
			return converterr("integer<I>", arg, msgbuf, bufsize);
		ival = (unsigned int)PyLong_AsUnsignedLongMask(arg);
		if (ival == (unsigned int)-1 && PyErr_Occurred())
			return converterr("integer<I>", arg, msgbuf, bufsize);
		else
			*p = ival;
		break;
	}

	case 'n': /* Py_ssize_t */
	{
		PyObject *iobj;
		Py_ssize_t *p = va_arg(*p_va, Py_ssize_t *);
		Py_ssize_t ival = -1;
		if (float_argument_error(arg))
			return converterr("integer<n>", arg, msgbuf, bufsize);
		iobj = PyNumber_Index(arg);
		if (iobj != NULL) {
			ival = PyLong_AsSsize_t(iobj);
			Py_DECREF(iobj);
		}
		if (ival == -1 && PyErr_Occurred())
			return converterr("integer<n>", arg, msgbuf, bufsize);
		*p = ival;
		break;
	}
	case 'l': {/* long int */
		long *p = va_arg(*p_va, long *);
		long ival;
		if (float_argument_error(arg))
			return converterr("integer<l>", arg, msgbuf, bufsize);
		ival = PyLong_AsLong(arg);
		if (ival == -1 && PyErr_Occurred())
			return converterr("integer<l>", arg, msgbuf, bufsize);
		else
			*p = ival;
		break;
	}

	case 'k': { /* long sized bitfield */
		unsigned long *p = va_arg(*p_va, unsigned long *);
		unsigned long ival;
		if (PyLong_Check(arg))
			ival = PyLong_AsUnsignedLongMask(arg);
		else
			return converterr("integer<k>", arg, msgbuf, bufsize);
		*p = ival;
		break;
	}

#ifdef HAVE_LONG_LONG
	case 'L': {/* PY_LONG_LONG */
		PY_LONG_LONG *p = va_arg( *p_va, PY_LONG_LONG * );
		PY_LONG_LONG ival = PyLong_AsLongLong( arg );
		if (ival == (PY_LONG_LONG)-1 && PyErr_Occurred() ) {
			return converterr("long<L>", arg, msgbuf, bufsize);
		} else {
			*p = ival;
		}
		break;
	}

	case 'K': { /* long long sized bitfield */
		unsigned PY_LONG_LONG *p = va_arg(*p_va, unsigned PY_LONG_LONG *);
		unsigned PY_LONG_LONG ival;
		if (PyLong_Check(arg))
			ival = PyLong_AsUnsignedLongLongMask(arg);
		else
			return converterr("integer<K>", arg, msgbuf, bufsize);
		*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 (PyBytes_Check(arg) && PyBytes_Size(arg) == 1)
			*p = PyBytes_AS_STRING(arg)[0];
		else if (PyUnicode_Check(arg) &&
			 PyUnicode_GET_SIZE(arg) == 1 &&
			 PyUnicode_AS_UNICODE(arg)[0] < 256)
			*p = (char)PyUnicode_AS_UNICODE(arg)[0];
		else
			return converterr("char < 256", arg, msgbuf, bufsize);
		break;
	}

	case 'C': {/* unicode char */
		int *p = va_arg(*p_va, int *);
		if (PyBytes_Check(arg) && PyBytes_Size(arg) == 1)
			*p = PyBytes_AS_STRING(arg)[0];
		else if (PyUnicode_Check(arg) &&
			 PyUnicode_GET_SIZE(arg) == 1)
			*p = PyUnicode_AS_UNICODE(arg)[0];
		else
			return converterr("char", arg, msgbuf, bufsize);
		break;
	}

	/* XXX WAAAAH!  's', 'y', 'z', 'u', 'Z', 'e', 'w', 't' codes all
	   need to be cleaned up! */

	case 's': {/* text string */
		if (*format == '*') {
			Py_buffer *p = (Py_buffer *)va_arg(*p_va, Py_buffer *);

			if (PyUnicode_Check(arg)) {
				uarg = UNICODE_DEFAULT_ENCODING(arg);
				if (uarg == NULL)
					return converterr(CONV_UNICODE,
							  arg, msgbuf, bufsize);
				PyBuffer_FillInfo(p, arg,
						  PyBytes_AS_STRING(uarg), PyBytes_GET_SIZE(uarg),
						  1, 0);
			}
			else { /* any buffer-like object */
				char *buf;
				if (getbuffer(arg, p, &buf) < 0)
					return converterr(buf, arg, msgbuf, bufsize);
			}
			format++;
		} else if (*format == '#') {
			void **p = (void **)va_arg(*p_va, char **);
			FETCH_SIZE;

			if (PyUnicode_Check(arg)) {
				uarg = UNICODE_DEFAULT_ENCODING(arg);
				if (uarg == NULL)
					return converterr(CONV_UNICODE,
							  arg, msgbuf, bufsize);
				*p = PyBytes_AS_STRING(uarg);
				STORE_SIZE(PyBytes_GET_SIZE(uarg));
			}
			else { /* any buffer-like object */
				/* XXX Really? */
				char *buf;
				Py_ssize_t count = convertbuffer(arg, p, &buf);
				if (count < 0)
					return converterr(buf, arg, msgbuf, bufsize);
				STORE_SIZE(count);
			}
			format++;
		} else {
			char **p = va_arg(*p_va, char **);

			if (PyUnicode_Check(arg)) {
				uarg = UNICODE_DEFAULT_ENCODING(arg);
				if (uarg == NULL)
					return converterr(CONV_UNICODE,
							  arg, msgbuf, bufsize);
				*p = PyBytes_AS_STRING(uarg);
			}
			else
				return converterr("string", arg, msgbuf, bufsize);
			if ((Py_ssize_t) strlen(*p) != PyBytes_GET_SIZE(uarg))
				return converterr("string without null bytes",
						  arg, msgbuf, bufsize);
		}
		break;
	}

	case 'y': {/* any buffer-like object, but not PyUnicode */
		void **p = (void **)va_arg(*p_va, char **);
		char *buf;
		Py_ssize_t count;
		if (*format == '*') {
			if (getbuffer(arg, (Py_buffer*)p, &buf) < 0)
				return converterr(buf, arg, msgbuf, bufsize);
			format++;
			break;
		}
		count = convertbuffer(arg, p, &buf);
		if (count < 0)
			return converterr(buf, arg, msgbuf, bufsize);
		else if (*format == '#') {
			FETCH_SIZE;
			STORE_SIZE(count);
			format++;
		}
		break;
	}

	case 'z': {/* like 's' or 's#', but None is okay, stored as NULL */
		if (*format == '*') {
			Py_buffer *p = (Py_buffer *)va_arg(*p_va, Py_buffer *);

			if (arg == Py_None)
				PyBuffer_FillInfo(p, NULL, NULL, 0, 1, 0);
			else if (PyUnicode_Check(arg)) {
				uarg = UNICODE_DEFAULT_ENCODING(arg);
				if (uarg == NULL)
					return converterr(CONV_UNICODE,
							  arg, msgbuf, bufsize);
				PyBuffer_FillInfo(p, arg,
						  PyBytes_AS_STRING(uarg), PyBytes_GET_SIZE(uarg),
						  1, 0);
			}
			else { /* any buffer-like object */
				char *buf;
				if (getbuffer(arg, p, &buf) < 0)
					return converterr(buf, arg, msgbuf, bufsize);
			}
			format++;
		} else if (*format == '#') { /* any buffer-like object */
			void **p = (void **)va_arg(*p_va, char **);
			FETCH_SIZE;

			if (arg == Py_None) {
				*p = 0;
				STORE_SIZE(0);
			}
			else if (PyUnicode_Check(arg)) {
				uarg = UNICODE_DEFAULT_ENCODING(arg);
				if (uarg == NULL)
					return converterr(CONV_UNICODE,
							  arg, msgbuf, bufsize);
				*p = PyBytes_AS_STRING(uarg);
				STORE_SIZE(PyBytes_GET_SIZE(uarg));
			}
			else { /* any buffer-like object */
				/* XXX Really? */
				char *buf;
				Py_ssize_t count = convertbuffer(arg, p, &buf);
				if (count < 0)
					return converterr(buf, arg, msgbuf, bufsize);
				STORE_SIZE(count);
			}
			format++;
		} else {
			char **p = va_arg(*p_va, char **);
			uarg = NULL;

			if (arg == Py_None)
				*p = 0;
			else if (PyBytes_Check(arg)) {
				/* Enable null byte check below */
				uarg = arg;
				*p = PyBytes_AS_STRING(arg);
			}
			else if (PyUnicode_Check(arg)) {
				uarg = UNICODE_DEFAULT_ENCODING(arg);
				if (uarg == NULL)
					return converterr(CONV_UNICODE,
							  arg, msgbuf, bufsize);
				*p = PyBytes_AS_STRING(uarg);
			}
			else
				return converterr("string or None",
						  arg, msgbuf, bufsize);
			if (*format == '#') {
				FETCH_SIZE;
				assert(0); /* XXX redundant with if-case */
				if (arg == Py_None) {
					STORE_SIZE(0);
				}
				else {
					STORE_SIZE(PyBytes_Size(arg));
				}
				format++;
			}
			else if (*p != NULL && uarg != NULL &&
				(Py_ssize_t) strlen(*p) != PyBytes_GET_SIZE(uarg))
				return converterr(
					"string without null bytes or None",
					arg, msgbuf, bufsize);
		}
		break;
	}

	case 'Z': {/* unicode, may be NULL (None) */
		if (*format == '#') { /* any buffer-like object */
			Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);
			FETCH_SIZE;

			if (arg == Py_None) {
				*p = 0;
				STORE_SIZE(0);
			}
			else if (PyUnicode_Check(arg)) {
				*p = PyUnicode_AS_UNICODE(arg);
				STORE_SIZE(PyUnicode_GET_SIZE(arg));
			}
			format++;
		} else {
			Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);

			if (arg == Py_None)
				*p = 0;
			else if (PyUnicode_Check(arg))
				*p = PyUnicode_AS_UNICODE(arg);
			else
				return converterr("string or None",
						  arg, msgbuf, bufsize);
		}
		break;
	}

	case 'e': {/* encoded string */
		char **buffer;
		const char *encoding;
		PyObject *s;
		int recode_strings;
		Py_ssize_t size;
		const char *ptr;

		/* Get 'e' parameter: the encoding name */
		encoding = (const char *)va_arg(*p_va, const char *);
		if (encoding == NULL)
			encoding = PyUnicode_GetDefaultEncoding();

		/* 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 &&
                    (PyBytes_Check(arg) || PyByteArray_Check(arg))) {
			s = arg;
			Py_INCREF(s);
                        if (PyObject_AsCharBuffer(s, &ptr, &size) < 0)
				return converterr("(AsCharBuffer failed)",
						  arg, msgbuf, bufsize);
		}
		else {
		    	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 (!PyBytes_Check(s)) {
				Py_DECREF(s);
				return converterr(
					"(encoder failed to return bytes)",
					arg, msgbuf, bufsize);
			}
			size = PyBytes_GET_SIZE(s);
			ptr = PyBytes_AS_STRING(s);
			if (ptr == NULL)
				ptr = "";
		}

		/* 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

			*/
			FETCH_SIZE;

			format++;
			if (q == NULL && q2 == NULL) {
				Py_DECREF(s);
				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);
				}
				if (addcleanup(*buffer, freelist)) {
					Py_DECREF(s);
					return converterr(
						"(cleanup problem)",
						arg, msgbuf, bufsize);
				}
			} else {
				if (size + 1 > BUFFER_LEN) {
					Py_DECREF(s);
					return converterr(
						"(buffer overflow)",
						arg, msgbuf, bufsize);
				}
			}
			memcpy(*buffer, ptr, size+1);
			STORE_SIZE(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 ((Py_ssize_t)strlen(ptr) != size) {
				Py_DECREF(s);
				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);
			}
			if (addcleanup(*buffer, freelist)) {
				Py_DECREF(s);
				return converterr("(cleanup problem)",
						arg, msgbuf, bufsize);
			}
			memcpy(*buffer, ptr, size+1);
		}
		Py_DECREF(s);
		break;
	}

	case 'u': {/* raw unicode buffer (Py_UNICODE *) */
		Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);
		if (!PyUnicode_Check(arg))
			return converterr("str", arg, msgbuf, bufsize);
		*p = PyUnicode_AS_UNICODE(arg);
		if (*format == '#') { /* store pointer and size */
			FETCH_SIZE;
			STORE_SIZE(PyUnicode_GET_SIZE(arg));
			format++;
		}
		break;
	}

	case 'S': { /* PyBytes object */
		PyObject **p = va_arg(*p_va, PyObject **);
		if (PyBytes_Check(arg))
			*p = arg;
		else
			return converterr("bytes", arg, msgbuf, bufsize);
		break;
	}

	case 'Y': { /* PyByteArray object */
		PyObject **p = va_arg(*p_va, PyObject **);
		if (PyByteArray_Check(arg))
			*p = arg;
		else
			return converterr("buffer", arg, msgbuf, bufsize);
		break;
	}

	case 'U': { /* PyUnicode object */
		PyObject **p = va_arg(*p_va, PyObject **);
		if (PyUnicode_Check(arg))
			*p = arg;
		else
			return converterr("str", arg, msgbuf, bufsize);
		break;
	}

	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;
		Py_ssize_t count;
                int temp=-1;
                Py_buffer view;

		if (pb && pb->bf_releasebuffer && *format != '*')
			/* Buffer must be released, yet caller does not use
			   the Py_buffer protocol. */
			return converterr("pinned buffer", arg, msgbuf, bufsize);


		if (pb && pb->bf_getbuffer && *format == '*') {
			/* Caller is interested in Py_buffer, and the object
			   supports it directly. */
			format++;
			if (PyObject_GetBuffer(arg, (Py_buffer*)p, PyBUF_WRITABLE) < 0) {
				PyErr_Clear();
				return converterr("read-write buffer", arg, msgbuf, bufsize);
			}
			if (!PyBuffer_IsContiguous((Py_buffer*)p, 'C'))
				return converterr("contiguous buffer", arg, msgbuf, bufsize);
			break;
		}

		/* Here we have processed w*, only w and w# remain. */
		if (pb == NULL ||
		    pb->bf_getbuffer == NULL ||
                    ((temp = PyObject_GetBuffer(arg, &view,
						PyBUF_SIMPLE)) != 0) ||
                    view.readonly == 1) {
                        if (temp==0) {
                                PyBuffer_Release(&view);
                        }
			return converterr("single-segment read-write buffer",
					  arg, msgbuf, bufsize);
                }

                if ((count = view.len) < 0)
			return converterr("(unspecified)", arg, msgbuf, bufsize);
                *p = view.buf;
		if (*format == '#') {
			FETCH_SIZE;
			STORE_SIZE(count);
			format++;
		}
		break;
	}

	  /*TEO: This can be eliminated --- here only for backward
	    compatibility */
	case 't': { /* 8-bit character buffer, read-only access */
		char **p = va_arg(*p_va, char **);
		PyBufferProcs *pb = arg->ob_type->tp_as_buffer;
		Py_ssize_t count;
                Py_buffer view;

		if (*format++ != '#')
			return converterr(
				"invalid use of 't' format character",
				arg, msgbuf, bufsize);
		if (pb == NULL || pb->bf_getbuffer == NULL)
			return converterr(
				"bytes or read-only character buffer",
				arg, msgbuf, bufsize);

		if (PyObject_GetBuffer(arg, &view, PyBUF_SIMPLE) != 0)
			return converterr("string or single-segment read-only buffer",
                                          arg, msgbuf, bufsize);

                count = view.len;
                *p = view.buf;
		if (pb->bf_releasebuffer)
			return converterr(
				"string or pinned buffer",
				arg, msgbuf, bufsize);

		PyBuffer_Release(&view);

		if (count < 0)
			return converterr("(unspecified)", arg, msgbuf, bufsize);
		{
			FETCH_SIZE;
			STORE_SIZE(count);
		}
		break;
	}

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

	}

	*p_format = format;
	return NULL;
}

static Py_ssize_t
convertbuffer(PyObject *arg, void **p, char **errmsg)
{
	PyBufferProcs *pb = arg->ob_type->tp_as_buffer;
	Py_ssize_t count;
        Py_buffer view;

        *errmsg = NULL;
        *p = NULL;
	if (pb == NULL ||
	    pb->bf_getbuffer == NULL ||
	    pb->bf_releasebuffer != NULL) {
		*errmsg = "bytes or read-only buffer";
		return -1;
	}

	if (PyObject_GetBuffer(arg, &view, PyBUF_SIMPLE) != 0) {
		*errmsg = "bytes or single-segment read-only buffer";
		return -1;
	}
        count = view.len;
        *p = view.buf;
	PyBuffer_Release(&view);
	return count;
}

/* XXX for 3.x, getbuffer and convertbuffer can probably
   be merged again. */
static int
getbuffer(PyObject *arg, Py_buffer *view, char **errmsg)
{
	void *buf;
	Py_ssize_t count;
	PyBufferProcs *pb = arg->ob_type->tp_as_buffer;
	if (pb == NULL) {
		*errmsg = "string or buffer";
		return -1;
	}
	if (pb->bf_getbuffer) {
		if (PyObject_GetBuffer(arg, view, 0) < 0) {
			*errmsg = "convertible to a buffer";
			return -1;
		}
		if (!PyBuffer_IsContiguous(view, 'C')) {
			*errmsg = "contiguous buffer";
			return -1;
		}
		return 0;
	}

	count = convertbuffer(arg, &buf, errmsg);
	if (count < 0) {
		*errmsg = "convertible to a buffer";
		return count;
	}
	PyBuffer_FillInfo(view, NULL, buf, count, 1, 0);
	return 0;
}

/* Support for keyword arguments donated by
   Geoff Philbrick <philbric@delphi.hks.com> */

/* Return false (0) for error, else true. */
int
PyArg_ParseTupleAndKeywords(PyObject *args,
			    PyObject *keywords,
			    const char *format,
			    char **kwlist, ...)
{
	int retval;
	va_list va;

	if ((args == NULL || !PyTuple_Check(args)) ||
	    (keywords != NULL && !PyDict_Check(keywords)) ||
	    format == NULL ||
	    kwlist == NULL)
	{
		PyErr_BadInternalCall();
		return 0;
	}

	va_start(va, kwlist);
	retval = vgetargskeywords(args, keywords, format, kwlist, &va, 0);
	va_end(va);
	return retval;
}

int
_PyArg_ParseTupleAndKeywords_SizeT(PyObject *args,
				  PyObject *keywords,
				  const char *format,
				  char **kwlist, ...)
{
	int retval;
	va_list va;

	if ((args == NULL || !PyTuple_Check(args)) ||
	    (keywords != NULL && !PyDict_Check(keywords)) ||
	    format == NULL ||
	    kwlist == NULL)
	{
		PyErr_BadInternalCall();
		return 0;
	}

	va_start(va, kwlist);
	retval = vgetargskeywords(args, keywords, format,
				  kwlist, &va, FLAG_SIZE_T);
	va_end(va);
	return retval;
}


int
PyArg_VaParseTupleAndKeywords(PyObject *args,
                              PyObject *keywords,
                              const char *format,
                              char **kwlist, va_list va)
{
	int retval;
	va_list lva;

	if ((args == NULL || !PyTuple_Check(args)) ||
	    (keywords != NULL && !PyDict_Check(keywords)) ||
	    format == NULL ||
	    kwlist == NULL)
	{
		PyErr_BadInternalCall();
		return 0;
	}

#ifdef VA_LIST_IS_ARRAY
	memcpy(lva, va, sizeof(va_list));
#else
#ifdef __va_copy
	__va_copy(lva, va);
#else
	lva = va;
#endif
#endif

	retval = vgetargskeywords(args, keywords, format, kwlist, &lva, 0);
	return retval;
}

int
_PyArg_VaParseTupleAndKeywords_SizeT(PyObject *args,
				    PyObject *keywords,
				    const char *format,
				    char **kwlist, va_list va)
{
	int retval;
	va_list lva;

	if ((args == NULL || !PyTuple_Check(args)) ||
	    (keywords != NULL && !PyDict_Check(keywords)) ||
	    format == NULL ||
	    kwlist == NULL)
	{
		PyErr_BadInternalCall();
		return 0;
	}

#ifdef VA_LIST_IS_ARRAY
	memcpy(lva, va, sizeof(va_list));
#else
#ifdef __va_copy
	__va_copy(lva, va);
#else
	lva = va;
#endif
#endif

	retval = vgetargskeywords(args, keywords, format,
				  kwlist, &lva, FLAG_SIZE_T);
	return retval;
}

#define IS_END_OF_FORMAT(c) (c == '\0' || c == ';' || c == ':')

static int
vgetargskeywords(PyObject *args, PyObject *keywords, const char *format,
	         char **kwlist, va_list *p_va, int flags)
{
	char msgbuf[512];
	int levels[32];
	const char *fname, *msg, *custom_msg, *keyword;
	int min = INT_MAX;
	int i, len, nargs, nkeywords;
	PyObject *freelist = NULL, *current_arg;

	assert(args != NULL && PyTuple_Check(args));
	assert(keywords == NULL || PyDict_Check(keywords));
	assert(format != NULL);
	assert(kwlist != NULL);
	assert(p_va != NULL);

	/* grab the function name or custom error msg first (mutually exclusive) */
	fname = strchr(format, ':');
	if (fname) {
		fname++;
		custom_msg = NULL;
	}
	else {
		custom_msg = strchr(format,';');
		if (custom_msg)
			custom_msg++;
	}

	/* scan kwlist and get greatest possible nbr of args */
	for (len=0; kwlist[len]; len++)
		continue;

	nargs = PyTuple_GET_SIZE(args);
	nkeywords = (keywords == NULL) ? 0 : PyDict_Size(keywords);
	if (nargs + nkeywords > len) {
		PyErr_Format(PyExc_TypeError, "%s%s takes at most %d "
			     "argument%s (%d given)",
			     (fname == NULL) ? "function" : fname,
			     (fname == NULL) ? "" : "()",
			     len,
			     (len == 1) ? "" : "s",
			     nargs + nkeywords);
		return 0;
	}

	/* convert tuple args and keyword args in same loop, using kwlist to drive process */
	for (i = 0; i < len; i++) {
		keyword = kwlist[i];
		if (*format == '|') {
			min = i;
			format++;
		}
		if (IS_END_OF_FORMAT(*format)) {
			PyErr_Format(PyExc_RuntimeError,
				     "More keyword list entries (%d) than "
				     "format specifiers (%d)", len, i);
			return cleanreturn(0, freelist);
		}
		current_arg = NULL;
		if (nkeywords) {
			current_arg = PyDict_GetItemString(keywords, keyword);
		}
		if (current_arg) {
			--nkeywords;
			if (i < nargs) {
				/* arg present in tuple and in dict */
				PyErr_Format(PyExc_TypeError,
					     "Argument given by name ('%s') "
					     "and position (%d)",
					     keyword, i+1);
				return cleanreturn(0, freelist);
			}
		}
		else if (nkeywords && PyErr_Occurred())
			return cleanreturn(0, freelist);
		else if (i < nargs)
			current_arg = PyTuple_GET_ITEM(args, i);
			
		if (current_arg) {
			msg = convertitem(current_arg, &format, p_va, flags,
				levels, msgbuf, sizeof(msgbuf), &freelist);
			if (msg) {
				seterror(i+1, msg, levels, fname, custom_msg);
				return cleanreturn(0, freelist);
			}
			continue;
		}

		if (i < min) {
			PyErr_Format(PyExc_TypeError, "Required argument "
				     "'%s' (pos %d) not found",
				     keyword, i+1);
			return cleanreturn(0, freelist);
		}
		/* current code reports success when all required args
		 * fulfilled and no keyword args left, with no further
		 * validation. XXX Maybe skip this in debug build ?
		 */
		if (!nkeywords)
			return cleanreturn(1, freelist);

		/* We are into optional args, skip thru to any remaining
		 * keyword args */
		msg = skipitem(&format, p_va, flags);
		if (msg) {
			PyErr_Format(PyExc_RuntimeError, "%s: '%s'", msg,
				     format);
			return cleanreturn(0, freelist);
		}
	}

	if (!IS_END_OF_FORMAT(*format)) {
		PyErr_Format(PyExc_RuntimeError,
			"more argument specifiers than keyword list entries "
			"(remaining format:'%s')", format);
		return cleanreturn(0, freelist);
	}

	/* make sure there are no extraneous keyword arguments */
	if (nkeywords > 0) {
		PyObject *key, *value;
		Py_ssize_t pos = 0;
		while (PyDict_Next(keywords, &pos, &key, &value)) {
			int match = 0;
			char *ks;
			if (!PyUnicode_Check(key)) {
				PyErr_SetString(PyExc_TypeError,
					        "keywords must be strings");
				return cleanreturn(0, freelist);
			}
			ks = _PyUnicode_AsString(key);
			for (i = 0; i < len; i++) {
				if (!strcmp(ks, kwlist[i])) {
					match = 1;
					break;
				}
			}
			if (!match) {
				PyErr_Format(PyExc_TypeError,
					     "'%s' is an invalid keyword "
					     "argument for this function",
					     ks);
				return cleanreturn(0, freelist);
			}
		}
	}

	return cleanreturn(1, freelist);
}


static char *
skipitem(const char **p_format, va_list *p_va, int flags)
{
	const char *format = *p_format;
	char c = *format++;

	switch (c) {

	/* simple codes
	 * The individual types (second arg of va_arg) are irrelevant */

	case 'b': /* byte -- very short int */
	case 'B': /* byte as bitfield */
	case 'h': /* short int */
	case 'H': /* short int as bitfield */
	case 'i': /* int */
	case 'I': /* int sized bitfield */
	case 'l': /* long int */
	case 'k': /* long int sized bitfield */
#ifdef HAVE_LONG_LONG
	case 'L': /* PY_LONG_LONG */
	case 'K': /* PY_LONG_LONG sized bitfield */
#endif
	case 'f': /* float */
	case 'd': /* double */
#ifndef WITHOUT_COMPLEX
	case 'D': /* complex double */
#endif
	case 'c': /* char */
		{
			(void) va_arg(*p_va, void *);
			break;
		}

	case 'n': /* Py_ssize_t */
		{
			(void) va_arg(*p_va, Py_ssize_t *);
			break;
		}

	/* string codes */

	case 'e': /* string with encoding */
		{
			(void) va_arg(*p_va, const char *);
			if (!(*format == 's' || *format == 't'))
				/* after 'e', only 's' and 't' is allowed */
				goto err;
			format++;
			/* explicit fallthrough to string cases */
		}

	case 's': /* string */
	case 'z': /* string or None */
	case 'y': /* bytes */
	case 'u': /* unicode string */
	case 't': /* buffer, read-only */
	case 'w': /* buffer, read-write */
		{
			(void) va_arg(*p_va, char **);
			if (*format == '#') {
				if (flags & FLAG_SIZE_T)
					(void) va_arg(*p_va, Py_ssize_t *);
				else
					(void) va_arg(*p_va, int *);
				format++;
			} else if ((c == 's' || c == 'z' || c == 'y') && *format == '*') {
				format++;
			}
			break;
		}

	/* object codes */

	case 'S': /* string object */
	case 'Y': /* string object */
	case 'U': /* unicode string object */
		{
			(void) va_arg(*p_va, PyObject **);
			break;
		}

	case 'O': /* object */
		{
			if (*format == '!') {
				format++;
				(void) va_arg(*p_va, PyTypeObject*);
				(void) va_arg(*p_va, PyObject **);
			}
#if 0
/* I don't know what this is for */
			else if (*format == '?') {
				inquiry pred = va_arg(*p_va, inquiry);
				format++;
				if ((*pred)(arg)) {
					(void) va_arg(*p_va, PyObject **);
				}
			}
#endif
			else if (*format == '&') {
				typedef int (*converter)(PyObject *, void *);
				(void) va_arg(*p_va, converter);
				(void) va_arg(*p_va, void *);
				format++;
			}
			else {
				(void) va_arg(*p_va, PyObject **);
			}
			break;
		}

	case '(':	/* bypass tuple, not handled at all previously */
		{
			char *msg;
			for (;;) {
				if (*format==')')
					break;
				if (IS_END_OF_FORMAT(*format))
					return "Unmatched left paren in format "
					       "string";
				msg = skipitem(&format, p_va, flags);
				if (msg)
					return msg;
			}
			format++;
			break;
		}

	case ')':
		return "Unmatched right paren in format string";

	default:
err:
		return "impossible<bad format char>";

	}

	*p_format = format;
	return NULL;
}


int
PyArg_UnpackTuple(PyObject *args, const char *name, Py_ssize_t min, Py_ssize_t max, ...)
{
	Py_ssize_t i, l;
	PyObject **o;
	va_list vargs;

#ifdef HAVE_STDARG_PROTOTYPES
	va_start(vargs, max);
#else
	va_start(vargs);
#endif

	assert(min >= 0);
	assert(min <= max);
	if (!PyTuple_Check(args)) {
		PyErr_SetString(PyExc_SystemError,
		    "PyArg_UnpackTuple() argument list is not a tuple");
		return 0;
	}
	l = PyTuple_GET_SIZE(args);
	if (l < min) {
		if (name != NULL)
			PyErr_Format(
			    PyExc_TypeError,
			    "%s expected %s%zd arguments, got %zd",
			    name, (min == max ? "" : "at least "), min, l);
		else
			PyErr_Format(
			    PyExc_TypeError,
			    "unpacked tuple should have %s%zd elements,"
			    " but has %zd",
			    (min == max ? "" : "at least "), min, l);
		va_end(vargs);
		return 0;
	}
	if (l > max) {
		if (name != NULL)
			PyErr_Format(
			    PyExc_TypeError,
			    "%s expected %s%zd arguments, got %zd",
			    name, (min == max ? "" : "at most "), max, l);
		else
			PyErr_Format(
			    PyExc_TypeError,
			    "unpacked tuple should have %s%zd elements,"
			    " but has %zd",
			    (min == max ? "" : "at most "), max, l);
		va_end(vargs);
		return 0;
	}
	for (i = 0; i < l; i++) {
		o = va_arg(vargs, PyObject **);
		*o = PyTuple_GET_ITEM(args, i);
	}
	va_end(vargs);
	return 1;
}


/* For type constructors that don't take keyword args
 *
 * Sets a TypeError and returns 0 if the kwds dict is
 * not empty, returns 1 otherwise
 */
int
_PyArg_NoKeywords(const char *funcname, PyObject *kw)
{
	if (kw == NULL)
		return 1;
	if (!PyDict_CheckExact(kw)) {
		PyErr_BadInternalCall();
		return 0;
	}
	if (PyDict_Size(kw) == 0)
		return 1;

	PyErr_Format(PyExc_TypeError, "%s does not take keyword arguments",
			funcname);
	return 0;
}
#ifdef __cplusplus
};
#endif