/***********************************************************

Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,

The Netherlands.

All Rights Reserved

Permission to use, copy, modify, and distribute this software and its

documentation for any purpose and without fee is hereby granted,

provided that the above copyright notice appear in all copies and that

both that copyright notice and this permission notice appear in

supporting documentation, and that the names of Stichting Mathematisch

Centrum or CWI or Corporation for National Research Initiatives or

CNRI not be used in advertising or publicity pertaining to

distribution of the software without specific, written prior

permission.

While CWI is the initial source for this software, a modified version

is made available by the Corporation for National Research Initiatives

(CNRI) at the Internet address ftp://ftp.python.org.

STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH

REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH

CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL

DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR

PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* New getargs implementation */

/* XXX There are several unchecked sprintf or strcat calls in this file.

XXX The only way these can become a danger is if some C code in the

XXX Python source (or in an extension) uses ridiculously long names

XXX or riduculously deep nesting in format strings. */

#include "Python.h"

#include <ctype.h>

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

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

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

int PyArg_ParseTupleAndKeywords Py_PROTO((PyObject *, PyObject *,

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

/* Forward */

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

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

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

int *, char *));

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

int *, char *, int));

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

static char *convertsimple1 Py_PROTO((PyObject *, char **, va_list *));

static int vgetargskeywords Py_PROTO((PyObject *, PyObject *,

char *, char **, va_list *));

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

#ifdef HAVE_STDARG_PROTOTYPES

/* VARARGS2 */

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

#else

/* VARARGS */

int PyArg_Parse(va_alist) va_dcl

#endif

{

int retval;

va_list va;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(va, format);

#else

PyObject *args;

char *format;

va_start(va);

args = va_arg(va, PyObject *);

format = va_arg(va, char *);

#endif

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

va_end(va);

return retval;

}

#ifdef HAVE_STDARG_PROTOTYPES

/* VARARGS2 */

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

#else

/* VARARGS */

int PyArg_ParseTuple(va_alist) va_dcl

#endif

{

int retval;

va_list va;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(va, format);

#else

PyObject *args;

char *format;

va_start(va);

args = va_arg(va, PyObject *);

format = va_arg(va, char *);

#endif

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

va_end(va);

return retval;

}

int

PyArg_VaParse(args, format, va)

PyObject *args;

char *format;

va_list va;

{

va_list lva;

#ifdef VA_LIST_IS_ARRAY

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

#else

lva = va;

#endif

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

}

static int

vgetargs1(args, format, p_va, compat)

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;

char *formatsave = format;

int i, len;

char *msg;

for (;;) {

int c = *format++;

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

if (level == 0)

max++;

level++;

}

else if (/* '(' */ c == ')') {

if (level == 0)

Py_FatalError(/* '(' */

"excess ')' in getargs format");

else

level--;

}

else if (c == '\0')

break;

else if (c == ':') {

fname = format;

break;

}

else if (c == ';') {

message = format;

break;

}

else if (level != 0)

; /* Pass */

else if (isalpha(c))

max++;

else if (c == '|')

min = max;

}

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;

sprintf(msgbuf, "%s requires no arguments",

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

PyErr_SetString(PyExc_TypeError, msgbuf);

return 0;

}

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

if (args == NULL) {

sprintf(msgbuf,

"%s requires at least one argument",

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

PyErr_SetString(PyExc_TypeError, msgbuf);

return 0;

}

msg = convertitem(args, &format, p_va, levels, 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_Size(args);

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

if (message == NULL) {

sprintf(msgbuf,

"%s requires %s %d argument%s; %d given",

fname==NULL ? "function" : fname,

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_GetItem(args, i), &format, p_va,

levels, 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(iarg, msg, levels, fname, message)

int iarg;

char *msg;

int *levels;

char *fname;

char *message;

{

char buf[256];

int i;

char *p = buf;

if (PyErr_Occurred())

return;

if (iarg == 0 && message == NULL)

message = msg;

else if (message == NULL) {

if (fname != NULL) {

sprintf(p, "%s, ", fname);

p += strlen(p);

}

sprintf(p, "argument %d", iarg);

i = 0;

p += strlen(p);

while (levels[i] > 0) {

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

p += strlen(p);

i++;

}

sprintf(p, ": expected %s found", 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:

"<typename1>, <typename2>", where:

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

<typename2> is the name of the actual type,

(so you can surround it by "expected ... found"),

and msgbuf is returned.

*/

static char *

converttuple(arg, p_format, p_va, levels, msgbuf, toplevel)

PyObject *arg;

char **p_format;

va_list *p_va;

int *levels;

char *msgbuf;

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)) {

levels[0] = 0;

sprintf(msgbuf,

toplevel ? "%d arguments, %s" : "%d-sequence, %s",

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

return msgbuf;

}

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

levels[0] = 0;

sprintf(msgbuf,

toplevel ? "%d arguments, %d" : "%d-sequence, %d-sequence",

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);

/* 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(arg, p_format, p_va, levels, msgbuf)

PyObject *arg;

char **p_format;

va_list *p_va;

int *levels;

char *msgbuf;

{

char *msg;

char *format = *p_format;

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

format++;

msg = converttuple(arg, &format, p_va, levels, msgbuf, 0);

if (msg == NULL)

format++;

}

else {

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

if (msg != NULL)

levels[0] = 0;

}

if (msg == NULL)

*p_format = format;

return msg;

}

/* Convert a non-tuple argument. Adds to convertsimple1 functionality

by appending ", <actual argument type>" to error message. */

static char *

convertsimple(arg, p_format, p_va, msgbuf)

PyObject *arg;

char **p_format;

va_list *p_va;

char *msgbuf;

{

char *msg = convertsimple1(arg, p_format, p_va);

if (msg != NULL) {

sprintf(msgbuf, "%.50s, %.50s", msg,

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

msg = msgbuf;

}

return msg;

}

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

or a string representing the expected type if the conversion failed.

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

Don't call if a tuple is expected. */

static char *

convertsimple1(arg, p_format, p_va)

PyObject *arg;

char **p_format;

va_list *p_va;

{

char *format = *p_format;

char c = *format++;

switch (c) {

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

{

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

long ival = PyInt_AsLong(arg);

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

return "integer<b>";

else

*p = (char) ival;

break;

}

case 'h': /* short int */

{

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

long ival = PyInt_AsLong(arg);

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

return "integer<h>";

else

*p = (short) ival;

break;

}

case 'i': /* int */

{

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

long ival = PyInt_AsLong(arg);

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

return "integer<i>";

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 "integer<l>";

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 "long<L>";

} else {

*p = ival;

}

break;

}

#endif

case 'f': /* float */

{

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

double dval = PyFloat_AsDouble(arg);

if (PyErr_Occurred())

return "float<f>";

else

*p = (float) dval;

break;

}

case 'd': /* double */

{

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

double dval = PyFloat_AsDouble(arg);

if (PyErr_Occurred())

return "float<d>";

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 "complex<D>";

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_AsString(arg)[0];

else

return "char";

break;

}

case 's': /* string */

{

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

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

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

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

int count;

if ( pb == NULL ||

pb->bf_getreadbuffer == NULL ||

pb->bf_getsegcount == NULL )

return "read-only buffer";

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

return "single-segment read-only buffer";

if ( (count =

(*pb->bf_getreadbuffer)(arg, 0, p)) < 0 )

return "(unspecified)";

*q = count;

format++;

} else {

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

if (PyString_Check(arg))

*p = PyString_AsString(arg);

else

return "string";

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

return "string without null bytes";

}

break;

}

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

{

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

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

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

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

int count;

if (arg == Py_None) {

*p = 0;

*q = 0;

} else {

if ( pb == NULL ||

pb->bf_getreadbuffer == NULL ||

pb->bf_getsegcount == NULL )

return "read-only buffer";

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

return "single-segment read-only buffer";

if ( (count = (*pb->bf_getreadbuffer)

(arg, 0, p)) < 0 )

return "(unspecified)";

*q = count;

}

format++;

} else {

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

if (arg == Py_None)

*p = 0;

else if (PyString_Check(arg))

*p = PyString_AsString(arg);

else

return "None or string";

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 "None or string without null bytes";

}

break;

}

case 'S': /* string object */

{

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

if (PyString_Check(arg))

*p = arg;

else

return "string";

break;

}

case 'O': /* object */

{

PyTypeObject *type;

PyObject **p;

if (*format == '!') {

type = va_arg(*p_va, PyTypeObject*);

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

format++;

if (arg->ob_type == type)

*p = arg;

else

return type->tp_name;

}

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

inquiry pred = va_arg(*p_va, inquiry);

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

format++;

if ((*pred)(arg))

*p = arg;

else

return "(unspecified)";

}

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

typedef int (*converter)

Py_PROTO((PyObject *, void *));

converter convert = va_arg(*p_va, converter);

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

format++;

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

return "(unspecified)";

}

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 "read-write buffer";

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

return "single-segment read-write buffer";

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

return "(unspecified)";

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 "invalid use of 't' format character";

if ( !PyType_HasFeature(

arg->ob_type,

Py_TPFLAGS_HAVE_GETCHARBUFFER) ||

pb == NULL ||

pb->bf_getcharbuffer == NULL ||

pb->bf_getsegcount == NULL )

return "read-only character buffer";

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

return "single-segment read-only buffer";

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

return "(unspecified)";

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

break;

}

default:

return "impossible<bad format char>";

}

*p_format = format;

return NULL;

}

/* Support for keyword arguments donated by

Geoff Philbrick <[email protected]> */

#ifdef HAVE_STDARG_PROTOTYPES

/* VARARGS2 */

int PyArg_ParseTupleAndKeywords(PyObject *args,

PyObject *keywords,

char *format,

char **kwlist, ...)

#else

/* VARARGS */

int PyArg_ParseTupleAndKeywords(va_alist) va_dcl

#endif

{

int retval;

va_list va;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(va, kwlist);

#else

PyObject *args;

PyObject *keywords;

char *format;

char **kwlist;

va_start(va);

args = va_arg(va, PyObject *);

keywords = va_arg(va, PyObject *);

format = va_arg(va, char *);

kwlist = va_arg(va, char **);

#endif

retval = vgetargskeywords(args, keywords, format, kwlist, &va);

va_end(va);

return retval;

}

static int

vgetargskeywords(args, keywords, format, kwlist, p_va)

PyObject *args;

PyObject *keywords;

char *format;

char **kwlist;

va_list *p_va;

{

char msgbuf[256];

int levels[32];

char *fname = NULL;

char *message = NULL;

int min = -1;

int max = 0;

char *formatsave = format;

int i, len, tplen, kwlen;

char *msg, *ks, **p;

int nkwds, pos, match, converted;

PyObject *key, *value;

/* nested tuples cannot be parsed when using keyword arguments */

for (;;) {

int c = *format++;

if (c == '(') {

PyErr_SetString(PyExc_SystemError,

"tuple found in format when using keyword arguments");

return 0;

}

else if (c == '\0')

break;

else if (c == ':') {

fname = format;

break;

}

else if (c == ';') {

message = format;

break;

}

else if (isalpha(c))

max++;

else if (c == '|')

min = max;

}

if (min < 0)

min = max;

format = formatsave;

if (!PyTuple_Check(args)) {

PyErr_SetString(PyExc_SystemError,

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

return 0;

}

tplen = PyTuple_Size(args);

/* do a cursory check of the keywords just to see how many we got */

if (keywords) {

if (!PyDict_Check(keywords)) {

PyErr_SetString(PyExc_SystemError,

"non-dictionary object received when keyword dictionary expected");

return 0;

}

kwlen = PyDict_Size(keywords);

}

else {

kwlen = 0;

}

/* make sure there are no duplicate values for an argument;

its not clear when to use the term "keyword argument vs.

keyword parameter in messages */

if (keywords) {

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

if (PyMapping_HasKeyString(keywords, kwlist[i])) {

sprintf(msgbuf,

"keyword parameter %s redefined",

kwlist[i]);

PyErr_SetString(PyExc_TypeError, msgbuf);

return 0;

}

}

}

PyErr_Clear(); /* I'm not which Py functions set the error string */

/* required arguments missing from args can be supplied by keyword

arguments */

len = tplen;

if (keywords && tplen < min) {

for (i = tplen; i < min; i++) {

if (PyMapping_HasKeyString(keywords, kwlist[i])) {

len++;

}

}

}

PyErr_Clear();

/* make sure we got an acceptable number of arguments; the message

is a little confusing with keywords since keyword arguments

which are supplied, but don't match the required arguments

are not included in the "%d given" part of the message */

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

if (message == NULL) {

sprintf(msgbuf,

"%s requires %s %d argument%s; %d given",

fname==NULL ? "function" : fname,

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 < tplen; i++) {

if (*format == '|')

format++;

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

levels, msgbuf);

if (msg) {

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

return 0;

}

}

/* handle no keyword parameters in call */

if (!keywords) return 1;

/* make sure the number of keywords in the keyword list matches the

number of items in the format string */

nkwds = 0;

p = kwlist;

for (;;) {

if (!*(p++)) break;

nkwds++;

}

if (nkwds != max) {

PyErr_SetString(PyExc_SystemError,

"number of items in format string and keyword list do not match");

return 0;

}

/* convert the keyword arguments; this uses the format

string where it was left after processing args */

converted = 0;

for (i = tplen; i < nkwds; i++) {

PyObject *item;

if (*format == '|')

format++;

item = PyMapping_GetItemString(keywords, kwlist[i]);

if (item != NULL) {

msg = convertitem(item, &format, p_va, levels, msgbuf);

if (msg) {

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

return 0;

}

converted++;

}

else {

PyErr_Clear();

msg = skipitem(&format, p_va);

if (msg) {

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

return 0;

}

}

}

/* make sure there are no extraneous keyword arguments */

pos = 0;

if (converted < kwlen) {

while (PyDict_Next(keywords, &pos, &key, &value)) {

match = 0;

ks = PyString_AsString(key);

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

if (!strcmp(ks, kwlist[i])) {

match = 1;

break;

}

}

if (!match) {

sprintf(msgbuf,

"%s is an invalid keyword argument for this function",

ks);

PyErr_SetString(PyExc_TypeError, msgbuf);

return 0;

}

}

}

return 1;

}

static char *

skipitem(p_format, p_va)