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cpython/Python/getargs.c

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/* New getargs implementation */
#define PY_CXX_CONST const
#include "Python.h"
#include "pycore_abstract.h" // _PyNumber_Index()
#include "pycore_dict.h" // _PyDict_HasOnlyStringKeys()
#include "pycore_modsupport.h" // export _PyArg_NoKeywords()
#include "pycore_pylifecycle.h" // _PyArg_Fini
#include "pycore_pystate.h" // _Py_IsMainInterpreter()
#include "pycore_tuple.h" // _PyTuple_ITEMS()
#include "pycore_pyerrors.h" // _Py_CalculateSuggestions()
/* Export Stable ABIs (abi only) */
PyAPI_FUNC(int) _PyArg_Parse_SizeT(PyObject *, const char *, ...);
PyAPI_FUNC(int) _PyArg_ParseTuple_SizeT(PyObject *, const char *, ...);
PyAPI_FUNC(int) _PyArg_ParseTupleAndKeywords_SizeT(PyObject *, PyObject *,
const char *, const char * const *, ...);
PyAPI_FUNC(int) _PyArg_VaParse_SizeT(PyObject *, const char *, va_list);
PyAPI_FUNC(int) _PyArg_VaParseTupleAndKeywords_SizeT(PyObject *, PyObject *,
const char *, const char * const *, va_list);
#define FLAG_COMPAT 1
typedef int (*destr_t)(PyObject *, void *);
/* Keep track of "objects" that have been allocated or initialized and
which will need to be deallocated or cleaned up somehow if overall
parsing fails.
*/
typedef struct {
void *item;
destr_t destructor;
} freelistentry_t;
typedef struct {
freelistentry_t *entries;
int first_available;
int entries_malloced;
} freelist_t;
#define STATIC_FREELIST_ENTRIES 8
/* Forward */
static int vgetargs1_impl(PyObject *args, PyObject *const *stack, Py_ssize_t nargs,
const char *format, va_list *p_va, int flags);
static int vgetargs1(PyObject *, const char *, va_list *, int);
static void seterror(Py_ssize_t, const char *, int *, const char *, const char *);
static const char *convertitem(PyObject *, const char **, va_list *, int, int *,
char *, size_t, freelist_t *);
static const char *converttuple(PyObject *, const char **, va_list *, int,
int *, char *, size_t, freelist_t *);
static const char *convertsimple(PyObject *, const char **, va_list *, int,
char *, size_t, freelist_t *);
static Py_ssize_t convertbuffer(PyObject *, const void **p, const char **);
static int getbuffer(PyObject *, Py_buffer *, const char**);
static int vgetargskeywords(PyObject *, PyObject *,
const char *, const char * const *, va_list *, int);
static int vgetargskeywordsfast(PyObject *, PyObject *,
struct _PyArg_Parser *, va_list *, int);
static int vgetargskeywordsfast_impl(PyObject *const *args, Py_ssize_t nargs,
PyObject *keywords, PyObject *kwnames,
struct _PyArg_Parser *parser,
va_list *p_va, int flags);
static const 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;
}
PyAPI_FUNC(int)
_PyArg_Parse_SizeT(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_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, 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_ParseStack(PyObject *const *args, Py_ssize_t nargs, const char *format, ...)
{
int retval;
va_list va;
va_start(va, format);
retval = vgetargs1_impl(NULL, args, nargs, format, &va, 0);
va_end(va);
return retval;
}
int
PyArg_VaParse(PyObject *args, const char *format, va_list va)
{
va_list lva;
int retval;
va_copy(lva, va);
retval = vgetargs1(args, format, &lva, 0);
va_end(lva);
return retval;
}
int
_PyArg_VaParse_SizeT(PyObject *args, const char *format, va_list va)
{
va_list lva;
int retval;
va_copy(lva, va);
retval = vgetargs1(args, format, &lva, 0);
va_end(lva);
return retval;
}
/* Handle cleanup of allocated memory in case of exception */
static int
cleanup_ptr(PyObject *self, void *ptr)
{
void **pptr = (void **)ptr;
PyMem_Free(*pptr);
*pptr = NULL;
return 0;
}
static int
cleanup_buffer(PyObject *self, void *ptr)
{
Py_buffer *buf = (Py_buffer *)ptr;
if (buf) {
PyBuffer_Release(buf);
}
return 0;
}
static int
addcleanup(void *ptr, freelist_t *freelist, destr_t destructor)
{
int index;
index = freelist->first_available;
freelist->first_available += 1;
freelist->entries[index].item = ptr;
freelist->entries[index].destructor = destructor;
return 0;
}
static int
cleanreturn(int retval, freelist_t *freelist)
{
int index;
if (retval == 0) {
/* A failure occurred, therefore execute all of the cleanup
functions.
*/
for (index = 0; index < freelist->first_available; ++index) {
freelist->entries[index].destructor(NULL,
freelist->entries[index].item);
}
}
if (freelist->entries_malloced)
PyMem_Free(freelist->entries);
return retval;
}
static int
vgetargs1_impl(PyObject *compat_args, PyObject *const *stack, Py_ssize_t nargs, 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;
const char *msg;
int compat = flags & FLAG_COMPAT;
freelistentry_t static_entries[STATIC_FREELIST_ENTRIES];
freelist_t freelist;
assert(nargs == 0 || stack != NULL);
freelist.entries = static_entries;
freelist.first_available = 0;
freelist.entries_malloced = 0;
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;
case '|':
if (level == 0)
min = max;
break;
default:
if (level == 0) {
if (Py_ISALPHA(c))
if (c != 'e') /* skip encoded */
max++;
}
break;
}
}
if (level != 0)
Py_FatalError(/* '(' */ "missing ')' in getargs format");
if (min < 0)
min = max;
format = formatsave;
if (max > STATIC_FREELIST_ENTRIES) {
freelist.entries = PyMem_NEW(freelistentry_t, max);
if (freelist.entries == NULL) {
PyErr_NoMemory();
return 0;
}
freelist.entries_malloced = 1;
}
if (compat) {
if (max == 0) {
if (compat_args == NULL)
return 1;
PyErr_Format(PyExc_TypeError,
"%.200s%s takes no arguments",
fname==NULL ? "function" : fname,
fname==NULL ? "" : "()");
return cleanreturn(0, &freelist);
}
else if (min == 1 && max == 1) {
if (compat_args == NULL) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes at least one argument",
fname==NULL ? "function" : fname,
fname==NULL ? "" : "()");
return cleanreturn(0, &freelist);
}
msg = convertitem(compat_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 cleanreturn(0, &freelist);
}
}
if (nargs < min || max < nargs) {
if (message == NULL)
PyErr_Format(PyExc_TypeError,
"%.150s%s takes %s %d argument%s (%zd given)",
fname==NULL ? "function" : fname,
fname==NULL ? "" : "()",
min==max ? "exactly"
: nargs < min ? "at least" : "at most",
nargs < min ? min : max,
(nargs < min ? min : max) == 1 ? "" : "s",
nargs);
else
PyErr_SetString(PyExc_TypeError, message);
return cleanreturn(0, &freelist);
}
for (i = 0; i < nargs; i++) {
if (*format == '|')
format++;
msg = convertitem(stack[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' && !Py_ISALPHA(*format) &&
*format != '(' &&
*format != '|' && *format != ':' && *format != ';') {
PyErr_Format(PyExc_SystemError,
"bad format string: %.200s", formatsave);
return cleanreturn(0, &freelist);
}
return cleanreturn(1, &freelist);
}
static int
vgetargs1(PyObject *args, const char *format, va_list *p_va, int flags)
{
PyObject **stack;
Py_ssize_t nargs;
if (!(flags & FLAG_COMPAT)) {
assert(args != NULL);
if (!PyTuple_Check(args)) {
PyErr_SetString(PyExc_SystemError,
"new style getargs format but argument is not a tuple");
return 0;
}
stack = _PyTuple_ITEMS(args);
nargs = PyTuple_GET_SIZE(args);
}
else {
stack = NULL;
nargs = 0;
}
return vgetargs1_impl(args, stack, nargs, format, p_va, flags);
}
static void
seterror(Py_ssize_t 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 %zd", iarg);
i = 0;
p += strlen(p);
while (i < 32 && levels[i] > 0 && (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;
}
if (msg[0] == '(') {
PyErr_SetString(PyExc_SystemError, message);
}
else {
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 const char *
converttuple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
int *levels, char *msgbuf, size_t bufsize,
freelist_t *freelist)
{
int level = 0;
int n = 0;
const char *format = *p_format;
int i;
Py_ssize_t len;
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 && Py_ISALPHA(c) && c != 'e')
n++;
}
if (!PySequence_Check(arg) || PyBytes_Check(arg)) {
levels[0] = 0;
PyOS_snprintf(msgbuf, bufsize,
"must be %d-item sequence, not %.50s",
n,
arg == Py_None ? "None" : Py_TYPE(arg)->tp_name);
return msgbuf;
}
len = PySequence_Size(arg);
if (len != n) {
levels[0] = 0;
PyOS_snprintf(msgbuf, bufsize,
"must be sequence of length %d, not %zd",
n, len);
return msgbuf;
}
format = *p_format;
for (i = 0; i < n; i++) {
const 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 const char *
convertitem(PyObject *arg, const char **p_format, va_list *p_va, int flags,
int *levels, char *msgbuf, size_t bufsize, freelist_t *freelist)
{
const char *msg;
const char *format = *p_format;
if (*format == '(' /* ')' */) {
format++;
msg = converttuple(arg, &format, p_va, flags, levels, msgbuf,
bufsize, 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;
}
/* Format an error message generated by convertsimple().
displayname must be UTF-8 encoded.
*/
void
_PyArg_BadArgument(const char *fname, const char *displayname,
const char *expected, PyObject *arg)
{
PyErr_Format(PyExc_TypeError,
"%.200s() %.200s must be %.50s, not %.50s",
fname, displayname, expected,
arg == Py_None ? "None" : Py_TYPE(arg)->tp_name);
}
static const char *
converterr(const char *expected, PyObject *arg, char *msgbuf, size_t bufsize)
{
assert(expected != NULL);
assert(arg != NULL);
if (expected[0] == '(') {
PyOS_snprintf(msgbuf, bufsize,
"%.100s", expected);
}
else {
PyOS_snprintf(msgbuf, bufsize,
"must be %.50s, not %.50s", expected,
arg == Py_None ? "None" : Py_TYPE(arg)->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.
When you add new format codes, please don't forget poor skipitem() below.
*/
static const char *
convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
char *msgbuf, size_t bufsize, freelist_t *freelist)
{
#define RETURN_ERR_OCCURRED return msgbuf
const char *format = *p_format;
char c = *format++;
const char *sarg;
switch (c) {
case 'b': { /* unsigned byte -- very short int */
unsigned char *p = va_arg(*p_va, unsigned char *);
long ival = PyLong_AsLong(arg);
if (ival == -1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else if (ival < 0) {
PyErr_SetString(PyExc_OverflowError,
"unsigned byte integer is less than minimum");
RETURN_ERR_OCCURRED;
}
else if (ival > UCHAR_MAX) {
PyErr_SetString(PyExc_OverflowError,
"unsigned byte integer is greater than maximum");
RETURN_ERR_OCCURRED;
}
else
*p = (unsigned char) ival;
break;
}
case 'B': {/* byte sized bitfield - both signed and unsigned
values allowed */
unsigned char *p = va_arg(*p_va, unsigned char *);
unsigned long ival = PyLong_AsUnsignedLongMask(arg);
if (ival == (unsigned long)-1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else
*p = (unsigned char) ival;
break;
}
case 'h': {/* signed short int */
short *p = va_arg(*p_va, short *);
long ival = PyLong_AsLong(arg);
if (ival == -1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else if (ival < SHRT_MIN) {
PyErr_SetString(PyExc_OverflowError,
"signed short integer is less than minimum");
RETURN_ERR_OCCURRED;
}
else if (ival > SHRT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"signed short integer is greater than maximum");
RETURN_ERR_OCCURRED;
}
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 *);
unsigned long ival = PyLong_AsUnsignedLongMask(arg);
if (ival == (unsigned long)-1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else
*p = (unsigned short) ival;
break;
}
case 'i': {/* signed int */
int *p = va_arg(*p_va, int *);
long ival = PyLong_AsLong(arg);
if (ival == -1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else if (ival > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"signed integer is greater than maximum");
RETURN_ERR_OCCURRED;
}
else if (ival < INT_MIN) {
PyErr_SetString(PyExc_OverflowError,
"signed integer is less than minimum");
RETURN_ERR_OCCURRED;
}
else
*p = ival;
break;
}
case 'I': { /* int sized bitfield, both signed and
unsigned allowed */
unsigned int *p = va_arg(*p_va, unsigned int *);
unsigned long ival = PyLong_AsUnsignedLongMask(arg);
if (ival == (unsigned long)-1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else
*p = (unsigned int) 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;
iobj = _PyNumber_Index(arg);
if (iobj != NULL) {
ival = PyLong_AsSsize_t(iobj);
Py_DECREF(iobj);
}
if (ival == -1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
*p = ival;
break;
}
case 'l': {/* long int */
long *p = va_arg(*p_va, long *);
long ival = PyLong_AsLong(arg);
if (ival == -1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
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("int", arg, msgbuf, bufsize);
*p = ival;
break;
}
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_ERR_OCCURRED;
else
*p = ival;
break;
}
case 'K': { /* long long sized bitfield */
unsigned long long *p = va_arg(*p_va, unsigned long long *);
unsigned long long ival;
if (PyLong_Check(arg))
ival = PyLong_AsUnsignedLongLongMask(arg);
else
return converterr("int", arg, msgbuf, bufsize);
*p = ival;
break;
}
case 'f': {/* float */
float *p = va_arg(*p_va, float *);
double dval = PyFloat_AsDouble(arg);
if (dval == -1.0 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else
*p = (float) dval;
break;
}
case 'd': {/* double */
double *p = va_arg(*p_va, double *);
double dval = PyFloat_AsDouble(arg);
if (dval == -1.0 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
else
*p = dval;
break;
}
case 'D': {/* complex double */
Py_complex *p = va_arg(*p_va, Py_complex *);
Py_complex cval;
cval = PyComplex_AsCComplex(arg);
if (PyErr_Occurred())
RETURN_ERR_OCCURRED;
else
*p = cval;
break;
}
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 (PyByteArray_Check(arg) && PyByteArray_Size(arg) == 1)
*p = PyByteArray_AS_STRING(arg)[0];
else
return converterr("a byte string of length 1", arg, msgbuf, bufsize);
break;
}
case 'C': {/* unicode char */
int *p = va_arg(*p_va, int *);
int kind;
const void *data;
if (!PyUnicode_Check(arg))
return converterr("a unicode character", arg, msgbuf, bufsize);
if (PyUnicode_GET_LENGTH(arg) != 1)
return converterr("a unicode character", arg, msgbuf, bufsize);
kind = PyUnicode_KIND(arg);
data = PyUnicode_DATA(arg);
*p = PyUnicode_READ(kind, data, 0);
break;
}
case 'p': {/* boolean *p*redicate */
int *p = va_arg(*p_va, int *);
int val = PyObject_IsTrue(arg);
if (val > 0)
*p = 1;
else if (val == 0)
*p = 0;
else
RETURN_ERR_OCCURRED;
break;
}
/* XXX WAAAAH! 's', 'y', 'z', 'u', 'Z', 'e', 'w' codes all
need to be cleaned up! */
case 'y': {/* any bytes-like object */
void **p = (void **)va_arg(*p_va, char **);
const char *buf;
Py_ssize_t count;
if (*format == '*') {
if (getbuffer(arg, (Py_buffer*)p, &buf) < 0)
return converterr(buf, arg, msgbuf, bufsize);
format++;
if (addcleanup(p, freelist, cleanup_buffer)) {
return converterr(
"(cleanup problem)",
arg, msgbuf, bufsize);
}
break;
}
count = convertbuffer(arg, (const void **)p, &buf);
if (count < 0)
return converterr(buf, arg, msgbuf, bufsize);
if (*format == '#') {
Py_ssize_t *psize = va_arg(*p_va, Py_ssize_t*);
*psize = count;
format++;
} else {
if (strlen(*p) != (size_t)count) {
PyErr_SetString(PyExc_ValueError, "embedded null byte");
RETURN_ERR_OCCURRED;
}
}
break;
}
case 's': /* text string or bytes-like object */
case 'z': /* text string, bytes-like object or None */
{
if (*format == '*') {
/* "s*" or "z*" */
Py_buffer *p = (Py_buffer *)va_arg(*p_va, Py_buffer *);
if (c == 'z' && arg == Py_None)
PyBuffer_FillInfo(p, NULL, NULL, 0, 1, 0);
else if (PyUnicode_Check(arg)) {
Py_ssize_t len;
sarg = PyUnicode_AsUTF8AndSize(arg, &len);
if (sarg == NULL)
return converterr(CONV_UNICODE,
arg, msgbuf, bufsize);
PyBuffer_FillInfo(p, arg, (void *)sarg, len, 1, 0);
}
else { /* any bytes-like object */
const char *buf;
if (getbuffer(arg, p, &buf) < 0)
return converterr(buf, arg, msgbuf, bufsize);
}
if (addcleanup(p, freelist, cleanup_buffer)) {
return converterr(
"(cleanup problem)",
arg, msgbuf, bufsize);
}
format++;
} else if (*format == '#') { /* a string or read-only bytes-like object */
/* "s#" or "z#" */
const void **p = (const void **)va_arg(*p_va, const char **);
Py_ssize_t *psize = va_arg(*p_va, Py_ssize_t*);
if (c == 'z' && arg == Py_None) {
*p = NULL;
*psize = 0;
}
else if (PyUnicode_Check(arg)) {
Py_ssize_t len;
sarg = PyUnicode_AsUTF8AndSize(arg, &len);
if (sarg == NULL)
return converterr(CONV_UNICODE,
arg, msgbuf, bufsize);
*p = sarg;
*psize = len;
}
else { /* read-only bytes-like object */
/* XXX Really? */
const char *buf;
Py_ssize_t count = convertbuffer(arg, p, &buf);
if (count < 0)
return converterr(buf, arg, msgbuf, bufsize);
*psize = count;
}
format++;
} else {
/* "s" or "z" */
const char **p = va_arg(*p_va, const char **);
Py_ssize_t len;
sarg = NULL;
if (c == 'z' && arg == Py_None)
*p = NULL;
else if (PyUnicode_Check(arg)) {
sarg = PyUnicode_AsUTF8AndSize(arg, &len);
if (sarg == NULL)
return converterr(CONV_UNICODE,
arg, msgbuf, bufsize);
if (strlen(sarg) != (size_t)len) {
PyErr_SetString(PyExc_ValueError, "embedded null character");
RETURN_ERR_OCCURRED;
}
*p = sarg;
}
else
return converterr(c == 'z' ? "str or None" : "str",
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 = Py_NewRef(arg);
if (PyBytes_Check(arg)) {
size = PyBytes_GET_SIZE(s);
ptr = PyBytes_AS_STRING(s);
}
else {
size = PyByteArray_GET_SIZE(s);
ptr = PyByteArray_AS_STRING(s);
}
}
else if (PyUnicode_Check(arg)) {
/* Encode object; use default error handling */
s = PyUnicode_AsEncodedString(arg,
encoding,
NULL);
if (s == NULL)
return converterr("(encoding failed)",
arg, msgbuf, bufsize);
assert(PyBytes_Check(s));
size = PyBytes_GET_SIZE(s);
ptr = PyBytes_AS_STRING(s);
if (ptr == NULL)
ptr = "";
}
else {
return converterr(
recode_strings ? "str" : "str, bytes or bytearray",
arg, msgbuf, bufsize);
}
/* 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
*/
Py_ssize_t *psize = va_arg(*p_va, Py_ssize_t*);
format++;
if (psize == 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);
PyErr_NoMemory();
RETURN_ERR_OCCURRED;
}
if (addcleanup(buffer, freelist, cleanup_ptr)) {
Py_DECREF(s);
return converterr(
"(cleanup problem)",
arg, msgbuf, bufsize);
}
} else {
if (size + 1 > *psize) {
Py_DECREF(s);
PyErr_Format(PyExc_ValueError,
"encoded string too long "
"(%zd, maximum length %zd)",
(Py_ssize_t)size, (Py_ssize_t)(*psize - 1));
RETURN_ERR_OCCURRED;
}
}
memcpy(*buffer, ptr, size+1);
*psize = 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);
PyErr_NoMemory();
RETURN_ERR_OCCURRED;
}
if (addcleanup(buffer, freelist, cleanup_ptr)) {
Py_DECREF(s);
return converterr("(cleanup problem)",
arg, msgbuf, bufsize);
}
memcpy(*buffer, ptr, size+1);
}
Py_DECREF(s);
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("bytearray", 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(Py_TYPE(arg), type))
*p = arg;
else
return converterr(type->tp_name, 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 *);
int res;
format++;
if (! (res = (*convert)(arg, addr)))
return converterr("(unspecified)",
arg, msgbuf, bufsize);
if (res == Py_CLEANUP_SUPPORTED &&
addcleanup(addr, freelist, convert) == -1)
return converterr("(cleanup problem)",
arg, msgbuf, bufsize);
}
else {
p = va_arg(*p_va, PyObject **);
*p = arg;
}
break;
}
case 'w': { /* "w*": memory buffer, read-write access */
void **p = va_arg(*p_va, void **);
if (*format != '*')
return converterr(
"(invalid use of 'w' format character)",
arg, msgbuf, bufsize);
format++;
/* Caller is interested in Py_buffer, and the object supports it
directly. The request implicitly asks for PyBUF_SIMPLE, so the
result is C-contiguous with format 'B'. */
if (PyObject_GetBuffer(arg, (Py_buffer*)p, PyBUF_WRITABLE) < 0) {
PyErr_Clear();
return converterr("read-write bytes-like object",
arg, msgbuf, bufsize);
}
assert(PyBuffer_IsContiguous((Py_buffer *)p, 'C'));
if (addcleanup(p, freelist, cleanup_buffer)) {
return converterr(
"(cleanup problem)",
arg, msgbuf, bufsize);
}
break;
}
default:
return converterr("(impossible<bad format char>)", arg, msgbuf, bufsize);
}
*p_format = format;
return NULL;
#undef RETURN_ERR_OCCURRED
}
static Py_ssize_t
convertbuffer(PyObject *arg, const void **p, const char **errmsg)
{
PyBufferProcs *pb = Py_TYPE(arg)->tp_as_buffer;
Py_ssize_t count;
Py_buffer view;
*errmsg = NULL;
*p = NULL;
if (pb != NULL && pb->bf_releasebuffer != NULL) {
*errmsg = "read-only bytes-like object";
return -1;
}
if (getbuffer(arg, &view, errmsg) < 0)
return -1;
count = view.len;
*p = view.buf;
PyBuffer_Release(&view);
return count;
}
static int
getbuffer(PyObject *arg, Py_buffer *view, const char **errmsg)
{
/* PyBUF_SIMPLE implies C-contiguous */
if (PyObject_GetBuffer(arg, view, PyBUF_SIMPLE) != 0) {
*errmsg = "bytes-like object";
return -1;
}
assert(PyBuffer_IsContiguous(view, 'C'));
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,
const char * const *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,
const char * const *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_VaParseTupleAndKeywords(PyObject *args,
PyObject *keywords,
const char *format,
const char * const *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;
}
va_copy(lva, va);
retval = vgetargskeywords(args, keywords, format, kwlist, &lva, 0);
va_end(lva);
return retval;
}
int
_PyArg_VaParseTupleAndKeywords_SizeT(PyObject *args,
PyObject *keywords,
const char *format,
const char * const *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;
}
va_copy(lva, va);
retval = vgetargskeywords(args, keywords, format,
kwlist, &lva, 0);
va_end(lva);
return retval;
}
PyAPI_FUNC(int)
_PyArg_ParseTupleAndKeywordsFast(PyObject *args, PyObject *keywords,
struct _PyArg_Parser *parser, ...)
{
int retval;
va_list va;
va_start(va, parser);
retval = vgetargskeywordsfast(args, keywords, parser, &va, 0);
va_end(va);
return retval;
}
int
_PyArg_ParseTupleAndKeywordsFast_SizeT(PyObject *args, PyObject *keywords,
struct _PyArg_Parser *parser, ...)
{
int retval;
va_list va;
va_start(va, parser);
retval = vgetargskeywordsfast(args, keywords, parser, &va, 0);
va_end(va);
return retval;
}
int
_PyArg_ParseStackAndKeywords(PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames,
struct _PyArg_Parser *parser, ...)
{
int retval;
va_list va;
va_start(va, parser);
retval = vgetargskeywordsfast_impl(args, nargs, NULL, kwnames, parser, &va, 0);
va_end(va);
return retval;
}
int
_PyArg_ParseStackAndKeywords_SizeT(PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames,
struct _PyArg_Parser *parser, ...)
{
int retval;
va_list va;
va_start(va, parser);
retval = vgetargskeywordsfast_impl(args, nargs, NULL, kwnames, parser, &va, 0);
va_end(va);
return retval;
}
static void
error_unexpected_keyword_arg(PyObject *kwargs, PyObject *kwnames, PyObject *kwtuple, const char *fname)
{
/* make sure there are no extraneous keyword arguments */
Py_ssize_t j = 0;
while (1) {
PyObject *keyword;
if (kwargs != NULL) {
if (!PyDict_Next(kwargs, &j, &keyword, NULL))
break;
}
else {
if (j >= PyTuple_GET_SIZE(kwnames))
break;
keyword = PyTuple_GET_ITEM(kwnames, j);
j++;
}
if (!PyUnicode_Check(keyword)) {
PyErr_SetString(PyExc_TypeError,
"keywords must be strings");
return;
}
int match = PySequence_Contains(kwtuple, keyword);
if (match <= 0) {
if (!match) {
PyObject *kwlist = PySequence_List(kwtuple);
if (!kwlist) {
return;
}
PyObject *suggestion_keyword = _Py_CalculateSuggestions(kwlist, keyword);
Py_DECREF(kwlist);
if (suggestion_keyword) {
PyErr_Format(PyExc_TypeError,
"%.200s%s got an unexpected keyword argument '%S'."
" Did you mean '%S'?",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()",
keyword,
suggestion_keyword);
Py_DECREF(suggestion_keyword);
}
else {
PyErr_Format(PyExc_TypeError,
"%.200s%s got an unexpected keyword argument '%S'",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()",
keyword);
}
}
return;
}
}
/* Something wrong happened. There are extraneous keyword arguments,
* but we don't know what. And we don't bother. */
PyErr_Format(PyExc_TypeError,
"invalid keyword argument for %.200s%s",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()");
}
int
PyArg_ValidateKeywordArguments(PyObject *kwargs)
{
if (!PyDict_Check(kwargs)) {
PyErr_BadInternalCall();
return 0;
}
if (!_PyDict_HasOnlyStringKeys(kwargs)) {
PyErr_SetString(PyExc_TypeError,
"keywords must be strings");
return 0;
}
return 1;
}
static PyObject *
new_kwtuple(const char * const *keywords, int total, int pos);
#define IS_END_OF_FORMAT(c) (c == '\0' || c == ';' || c == ':')
static int
vgetargskeywords(PyObject *args, PyObject *kwargs, const char *format,
const char * const *kwlist, va_list *p_va, int flags)
{
char msgbuf[512];
int levels[32];
const char *fname, *msg, *custom_msg;
int min = INT_MAX;
int max = INT_MAX;
int i, pos, len;
int skip = 0;
Py_ssize_t nargs, nkwargs;
freelistentry_t static_entries[STATIC_FREELIST_ENTRIES];
freelist_t freelist;
freelist.entries = static_entries;
freelist.first_available = 0;
freelist.entries_malloced = 0;
assert(args != NULL && PyTuple_Check(args));
assert(kwargs == NULL || PyDict_Check(kwargs));
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 count the number of positional-only parameters */
for (pos = 0; kwlist[pos] && !*kwlist[pos]; pos++) {
}
/* scan kwlist and get greatest possible nbr of args */
for (len = pos; kwlist[len]; len++) {
if (!*kwlist[len]) {
PyErr_SetString(PyExc_SystemError,
"Empty keyword parameter name");
return cleanreturn(0, &freelist);
}
}
if (len > STATIC_FREELIST_ENTRIES) {
freelist.entries = PyMem_NEW(freelistentry_t, len);
if (freelist.entries == NULL) {
PyErr_NoMemory();
return 0;
}
freelist.entries_malloced = 1;
}
nargs = PyTuple_GET_SIZE(args);
nkwargs = (kwargs == NULL) ? 0 : PyDict_GET_SIZE(kwargs);
if (nargs + nkwargs > len) {
/* Adding "keyword" (when nargs == 0) prevents producing wrong error
messages in some special cases (see bpo-31229). */
PyErr_Format(PyExc_TypeError,
"%.200s%s takes at most %d %sargument%s (%zd given)",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()",
len,
(nargs == 0) ? "keyword " : "",
(len == 1) ? "" : "s",
nargs + nkwargs);
return cleanreturn(0, &freelist);
}
/* convert tuple args and keyword args in same loop, using kwlist to drive process */
for (i = 0; i < len; i++) {
if (*format == '|') {
if (min != INT_MAX) {
PyErr_SetString(PyExc_SystemError,
"Invalid format string (| specified twice)");
return cleanreturn(0, &freelist);
}
min = i;
format++;
if (max != INT_MAX) {
PyErr_SetString(PyExc_SystemError,
"Invalid format string ($ before |)");
return cleanreturn(0, &freelist);
}
}
if (*format == '$') {
if (max != INT_MAX) {
PyErr_SetString(PyExc_SystemError,
"Invalid format string ($ specified twice)");
return cleanreturn(0, &freelist);
}
max = i;
format++;
if (max < pos) {
PyErr_SetString(PyExc_SystemError,
"Empty parameter name after $");
return cleanreturn(0, &freelist);
}
if (skip) {
/* Now we know the minimal and the maximal numbers of
* positional arguments and can raise an exception with
* informative message (see below). */
break;
}
if (max < nargs) {
if (max == 0) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes no positional arguments",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()");
}
else {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional argument%s"
" (%zd given)",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()",
(min != INT_MAX) ? "at most" : "exactly",
max,
max == 1 ? "" : "s",
nargs);
}
return cleanreturn(0, &freelist);
}
}
if (IS_END_OF_FORMAT(*format)) {
PyErr_Format(PyExc_SystemError,
"More keyword list entries (%d) than "
"format specifiers (%d)", len, i);
return cleanreturn(0, &freelist);
}
if (!skip) {
PyObject *current_arg;
if (i < nargs) {
current_arg = Py_NewRef(PyTuple_GET_ITEM(args, i));
}
else if (nkwargs && i >= pos) {
if (PyDict_GetItemStringRef(kwargs, kwlist[i], &current_arg) < 0) {
return cleanreturn(0, &freelist);
}
if (current_arg) {
--nkwargs;
}
}
else {
current_arg = NULL;
}
if (current_arg) {
msg = convertitem(current_arg, &format, p_va, flags,
levels, msgbuf, sizeof(msgbuf), &freelist);
Py_DECREF(current_arg);
if (msg) {
seterror(i+1, msg, levels, fname, custom_msg);
return cleanreturn(0, &freelist);
}
continue;
}
if (i < min) {
if (i < pos) {
assert (min == INT_MAX);
assert (max == INT_MAX);
skip = 1;
/* At that moment we still don't know the minimal and
* the maximal numbers of positional arguments. Raising
* an exception is deferred until we encounter | and $
* or the end of the format. */
}
else {
PyErr_Format(PyExc_TypeError, "%.200s%s missing required "
"argument '%s' (pos %d)",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()",
kwlist[i], 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 (!nkwargs && !skip) {
return cleanreturn(1, &freelist);
}
}
/* We are into optional args, skip through to any remaining
* keyword args */
msg = skipitem(&format, p_va, flags);
if (msg) {
PyErr_Format(PyExc_SystemError, "%s: '%s'", msg,
format);
return cleanreturn(0, &freelist);
}
}
if (skip) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional argument%s"
" (%zd given)",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()",
(Py_MIN(pos, min) < i) ? "at least" : "exactly",
Py_MIN(pos, min),
Py_MIN(pos, min) == 1 ? "" : "s",
nargs);
return cleanreturn(0, &freelist);
}
if (!IS_END_OF_FORMAT(*format) && (*format != '|') && (*format != '$')) {
PyErr_Format(PyExc_SystemError,
"more argument specifiers than keyword list entries "
"(remaining format:'%s')", format);
return cleanreturn(0, &freelist);
}
if (nkwargs > 0) {
PyObject *key;
Py_ssize_t j;
/* make sure there are no arguments given by name and position */
for (i = pos; i < nargs; i++) {
PyObject *current_arg;
if (PyDict_GetItemStringRef(kwargs, kwlist[i], &current_arg) < 0) {
return cleanreturn(0, &freelist);
}
if (current_arg) {
Py_DECREF(current_arg);
/* arg present in tuple and in dict */
PyErr_Format(PyExc_TypeError,
"argument for %.200s%s given by name ('%s') "
"and position (%d)",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()",
kwlist[i], i+1);
return cleanreturn(0, &freelist);
}
}
/* make sure there are no extraneous keyword arguments */
j = 0;
while (PyDict_Next(kwargs, &j, &key, NULL)) {
int match = 0;
if (!PyUnicode_Check(key)) {
PyErr_SetString(PyExc_TypeError,
"keywords must be strings");
return cleanreturn(0, &freelist);
}
for (i = pos; i < len; i++) {
if (PyUnicode_EqualToUTF8(key, kwlist[i])) {
match = 1;
break;
}
}
if (!match) {
PyObject *_pykwtuple = new_kwtuple(kwlist, len, pos);
if (!_pykwtuple) {
return cleanreturn(0, &freelist);
}
PyObject *pykwlist = PySequence_List(_pykwtuple);
Py_DECREF(_pykwtuple);
if (!pykwlist) {
return cleanreturn(0, &freelist);
}
PyObject *suggestion_keyword = _Py_CalculateSuggestions(pykwlist, key);
Py_DECREF(pykwlist);
if (suggestion_keyword) {
PyErr_Format(PyExc_TypeError,
"%.200s%s got an unexpected keyword argument '%S'."
" Did you mean '%S'?",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()",
key,
suggestion_keyword);
Py_DECREF(suggestion_keyword);
}
else {
PyErr_Format(PyExc_TypeError,
"%.200s%s got an unexpected keyword argument '%S'",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()",
key);
}
return cleanreturn(0, &freelist);
}
}
/* Something wrong happened. There are extraneous keyword arguments,
* but we don't know what. And we don't bother. */
PyErr_Format(PyExc_TypeError,
"invalid keyword argument for %.200s%s",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()");
return cleanreturn(0, &freelist);
}
return cleanreturn(1, &freelist);
}
static int
scan_keywords(const char * const *keywords, int *ptotal, int *pposonly)
{
/* scan keywords and count the number of positional-only parameters */
int i;
for (i = 0; keywords[i] && !*keywords[i]; i++) {
}
*pposonly = i;
/* scan keywords and get greatest possible nbr of args */
for (; keywords[i]; i++) {
if (!*keywords[i]) {
PyErr_SetString(PyExc_SystemError,
"Empty keyword parameter name");
return -1;
}
}
*ptotal = i;
return 0;
}
static int
parse_format(const char *format, int total, int npos,
const char **pfname, const char **pcustommsg,
int *pmin, int *pmax)
{
/* grab the function name or custom error msg first (mutually exclusive) */
const char *custommsg;
const char *fname = strchr(format, ':');
if (fname) {
fname++;
custommsg = NULL;
}
else {
custommsg = strchr(format,';');
if (custommsg) {
custommsg++;
}
}
int min = INT_MAX;
int max = INT_MAX;
for (int i = 0; i < total; i++) {
if (*format == '|') {
if (min != INT_MAX) {
PyErr_SetString(PyExc_SystemError,
"Invalid format string (| specified twice)");
return -1;
}
if (max != INT_MAX) {
PyErr_SetString(PyExc_SystemError,
"Invalid format string ($ before |)");
return -1;
}
min = i;
format++;
}
if (*format == '$') {
if (max != INT_MAX) {
PyErr_SetString(PyExc_SystemError,
"Invalid format string ($ specified twice)");
return -1;
}
if (i < npos) {
PyErr_SetString(PyExc_SystemError,
"Empty parameter name after $");
return -1;
}
max = i;
format++;
}
if (IS_END_OF_FORMAT(*format)) {
PyErr_Format(PyExc_SystemError,
"More keyword list entries (%d) than "
"format specifiers (%d)", total, i);
return -1;
}
const char *msg = skipitem(&format, NULL, 0);
if (msg) {
PyErr_Format(PyExc_SystemError, "%s: '%s'", msg,
format);
return -1;
}
}
min = Py_MIN(min, total);
max = Py_MIN(max, total);
if (!IS_END_OF_FORMAT(*format) && (*format != '|') && (*format != '$')) {
PyErr_Format(PyExc_SystemError,
"more argument specifiers than keyword list entries "
"(remaining format:'%s')", format);
return -1;
}
*pfname = fname;
*pcustommsg = custommsg;
*pmin = min;
*pmax = max;
return 0;
}
static PyObject *
new_kwtuple(const char * const *keywords, int total, int pos)
{
int nkw = total - pos;
PyObject *kwtuple = PyTuple_New(nkw);
if (kwtuple == NULL) {
return NULL;
}
keywords += pos;
for (int i = 0; i < nkw; i++) {
PyObject *str = PyUnicode_FromString(keywords[i]);
if (str == NULL) {
Py_DECREF(kwtuple);
return NULL;
}
PyInterpreterState *interp = _PyInterpreterState_GET();
_PyUnicode_InternImmortal(interp, &str);
PyTuple_SET_ITEM(kwtuple, i, str);
}
return kwtuple;
}
static int
_parser_init(void *arg)
{
struct _PyArg_Parser *parser = (struct _PyArg_Parser *)arg;
const char * const *keywords = parser->keywords;
assert(keywords != NULL);
assert(parser->pos == 0 &&
(parser->format == NULL || parser->fname == NULL) &&
parser->custom_msg == NULL &&
parser->min == 0 &&
parser->max == 0);
int len, pos;
if (scan_keywords(keywords, &len, &pos) < 0) {
return -1;
}
const char *fname, *custommsg = NULL;
int min = 0, max = 0;
if (parser->format) {
assert(parser->fname == NULL);
if (parse_format(parser->format, len, pos,
&fname, &custommsg, &min, &max) < 0) {
return -1;
}
}
else {
assert(parser->fname != NULL);
fname = parser->fname;
}
int owned;
PyObject *kwtuple = parser->kwtuple;
if (kwtuple == NULL) {
/* We may temporarily switch to the main interpreter to avoid
* creating a tuple that could outlive its owning interpreter. */
PyThreadState *save_tstate = NULL;
PyThreadState *temp_tstate = NULL;
if (!_Py_IsMainInterpreter(PyInterpreterState_Get())) {
temp_tstate = PyThreadState_New(_PyInterpreterState_Main());
if (temp_tstate == NULL) {
return -1;
}
save_tstate = PyThreadState_Swap(temp_tstate);
}
kwtuple = new_kwtuple(keywords, len, pos);
if (temp_tstate != NULL) {
PyThreadState_Clear(temp_tstate);
(void)PyThreadState_Swap(save_tstate);
PyThreadState_Delete(temp_tstate);
}
if (kwtuple == NULL) {
return -1;
}
owned = 1;
}
else {
owned = 0;
}
parser->pos = pos;
parser->fname = fname;
parser->custom_msg = custommsg;
parser->min = min;
parser->max = max;
parser->kwtuple = kwtuple;
parser->is_kwtuple_owned = owned;
assert(parser->next == NULL);
parser->next = _Py_atomic_load_ptr(&_PyRuntime.getargs.static_parsers);
do {
// compare-exchange updates parser->next on failure
} while (!_Py_atomic_compare_exchange_ptr(&_PyRuntime.getargs.static_parsers,
&parser->next, parser));
return 0;
}
static int
parser_init(struct _PyArg_Parser *parser)
{
return _PyOnceFlag_CallOnce(&parser->once, &_parser_init, parser);
}
static void
parser_clear(struct _PyArg_Parser *parser)
{
if (parser->is_kwtuple_owned) {
Py_CLEAR(parser->kwtuple);
}
if (parser->format) {
parser->fname = NULL;
}
else {
assert(parser->fname != NULL);
}
parser->custom_msg = NULL;
parser->pos = 0;
parser->min = 0;
parser->max = 0;
parser->is_kwtuple_owned = 0;
parser->once.v = 0;
}
static PyObject*
find_keyword(PyObject *kwnames, PyObject *const *kwstack, PyObject *key)
{
Py_ssize_t i, nkwargs;
nkwargs = PyTuple_GET_SIZE(kwnames);
for (i = 0; i < nkwargs; i++) {
PyObject *kwname = PyTuple_GET_ITEM(kwnames, i);
/* kwname == key will normally find a match in since keyword keys
should be interned strings; if not retry below in a new loop. */
if (kwname == key) {
return Py_NewRef(kwstack[i]);
}
}
for (i = 0; i < nkwargs; i++) {
PyObject *kwname = PyTuple_GET_ITEM(kwnames, i);
assert(PyUnicode_Check(kwname));
if (_PyUnicode_EQ(kwname, key)) {
return Py_NewRef(kwstack[i]);
}
}
return NULL;
}
static int
vgetargskeywordsfast_impl(PyObject *const *args, Py_ssize_t nargs,
PyObject *kwargs, PyObject *kwnames,
struct _PyArg_Parser *parser,
va_list *p_va, int flags)
{
PyObject *kwtuple;
char msgbuf[512];
int levels[32];
const char *format;
const char *msg;
PyObject *keyword;
int i, pos, len;
Py_ssize_t nkwargs;
freelistentry_t static_entries[STATIC_FREELIST_ENTRIES];
freelist_t freelist;
PyObject *const *kwstack = NULL;
freelist.entries = static_entries;
freelist.first_available = 0;
freelist.entries_malloced = 0;
assert(kwargs == NULL || PyDict_Check(kwargs));
assert(kwargs == NULL || kwnames == NULL);
assert(p_va != NULL);
if (parser == NULL) {
PyErr_BadInternalCall();
return 0;
}
if (kwnames != NULL && !PyTuple_Check(kwnames)) {
PyErr_BadInternalCall();
return 0;
}
if (parser_init(parser) < 0) {
return 0;
}
kwtuple = parser->kwtuple;
pos = parser->pos;
len = pos + (int)PyTuple_GET_SIZE(kwtuple);
if (len > STATIC_FREELIST_ENTRIES) {
freelist.entries = PyMem_NEW(freelistentry_t, len);
if (freelist.entries == NULL) {
PyErr_NoMemory();
return 0;
}
freelist.entries_malloced = 1;
}
if (kwargs != NULL) {
nkwargs = PyDict_GET_SIZE(kwargs);
}
else if (kwnames != NULL) {
nkwargs = PyTuple_GET_SIZE(kwnames);
kwstack = args + nargs;
}
else {
nkwargs = 0;
}
if (nargs + nkwargs > len) {
/* Adding "keyword" (when nargs == 0) prevents producing wrong error
messages in some special cases (see bpo-31229). */
PyErr_Format(PyExc_TypeError,
"%.200s%s takes at most %d %sargument%s (%zd given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
len,
(nargs == 0) ? "keyword " : "",
(len == 1) ? "" : "s",
nargs + nkwargs);
return cleanreturn(0, &freelist);
}
if (parser->max < nargs) {
if (parser->max == 0) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes no positional arguments",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()");
}
else {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional argument%s (%zd given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
(parser->min < parser->max) ? "at most" : "exactly",
parser->max,
parser->max == 1 ? "" : "s",
nargs);
}
return cleanreturn(0, &freelist);
}
format = parser->format;
assert(format != NULL || len == 0);
/* convert tuple args and keyword args in same loop, using kwtuple to drive process */
for (i = 0; i < len; i++) {
if (*format == '|') {
format++;
}
if (*format == '$') {
format++;
}
assert(!IS_END_OF_FORMAT(*format));
PyObject *current_arg;
if (i < nargs) {
current_arg = Py_NewRef(args[i]);
}
else if (nkwargs && i >= pos) {
keyword = PyTuple_GET_ITEM(kwtuple, i - pos);
if (kwargs != NULL) {
if (PyDict_GetItemRef(kwargs, keyword, &current_arg) < 0) {
return cleanreturn(0, &freelist);
}
}
else {
current_arg = find_keyword(kwnames, kwstack, keyword);
}
if (current_arg) {
--nkwargs;
}
}
else {
current_arg = NULL;
}
if (current_arg) {
msg = convertitem(current_arg, &format, p_va, flags,
levels, msgbuf, sizeof(msgbuf), &freelist);
Py_DECREF(current_arg);
if (msg) {
seterror(i+1, msg, levels, parser->fname, parser->custom_msg);
return cleanreturn(0, &freelist);
}
continue;
}
if (i < parser->min) {
/* Less arguments than required */
if (i < pos) {
Py_ssize_t min = Py_MIN(pos, parser->min);
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional argument%s"
" (%zd given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
min < parser->max ? "at least" : "exactly",
min,
min == 1 ? "" : "s",
nargs);
}
else {
keyword = PyTuple_GET_ITEM(kwtuple, i - pos);
PyErr_Format(PyExc_TypeError, "%.200s%s missing required "
"argument '%U' (pos %d)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
keyword, i+1);
}
return cleanreturn(0, &freelist);
}
/* current code reports success when all required args
* fulfilled and no keyword args left, with no further
* validation. XXX Maybe skip this in debug build ?
*/
if (!nkwargs) {
return cleanreturn(1, &freelist);
}
/* We are into optional args, skip through to any remaining
* keyword args */
msg = skipitem(&format, p_va, flags);
assert(msg == NULL);
}
assert(IS_END_OF_FORMAT(*format) || (*format == '|') || (*format == '$'));
if (nkwargs > 0) {
/* make sure there are no arguments given by name and position */
for (i = pos; i < nargs; i++) {
PyObject *current_arg;
keyword = PyTuple_GET_ITEM(kwtuple, i - pos);
if (kwargs != NULL) {
if (PyDict_GetItemRef(kwargs, keyword, &current_arg) < 0) {
return cleanreturn(0, &freelist);
}
}
else {
current_arg = find_keyword(kwnames, kwstack, keyword);
}
if (current_arg) {
Py_DECREF(current_arg);
/* arg present in tuple and in dict */
PyErr_Format(PyExc_TypeError,
"argument for %.200s%s given by name ('%U') "
"and position (%d)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
keyword, i+1);
return cleanreturn(0, &freelist);
}
}
error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname);
return cleanreturn(0, &freelist);
}
return cleanreturn(1, &freelist);
}
static int
vgetargskeywordsfast(PyObject *args, PyObject *keywords,
struct _PyArg_Parser *parser, va_list *p_va, int flags)
{
PyObject **stack;
Py_ssize_t nargs;
if (args == NULL
|| !PyTuple_Check(args)
|| (keywords != NULL && !PyDict_Check(keywords)))
{
PyErr_BadInternalCall();
return 0;
}
stack = _PyTuple_ITEMS(args);
nargs = PyTuple_GET_SIZE(args);
return vgetargskeywordsfast_impl(stack, nargs, keywords, NULL,
parser, p_va, flags);
}
#undef _PyArg_UnpackKeywords
PyObject * const *
_PyArg_UnpackKeywords(PyObject *const *args, Py_ssize_t nargs,
PyObject *kwargs, PyObject *kwnames,
struct _PyArg_Parser *parser,
int minpos, int maxpos, int minkw,
PyObject **buf)
{
PyObject *kwtuple;
PyObject *keyword;
int i, posonly, minposonly, maxargs;
int reqlimit = minkw ? maxpos + minkw : minpos;
Py_ssize_t nkwargs;
PyObject * const *kwstack = NULL;
assert(kwargs == NULL || PyDict_Check(kwargs));
assert(kwargs == NULL || kwnames == NULL);
if (parser == NULL) {
PyErr_BadInternalCall();
return NULL;
}
if (kwnames != NULL && !PyTuple_Check(kwnames)) {
PyErr_BadInternalCall();
return NULL;
}
if (args == NULL && nargs == 0) {
args = buf;
}
if (parser_init(parser) < 0) {
return NULL;
}
kwtuple = parser->kwtuple;
posonly = parser->pos;
minposonly = Py_MIN(posonly, minpos);
maxargs = posonly + (int)PyTuple_GET_SIZE(kwtuple);
if (kwargs != NULL) {
nkwargs = PyDict_GET_SIZE(kwargs);
}
else if (kwnames != NULL) {
nkwargs = PyTuple_GET_SIZE(kwnames);
kwstack = args + nargs;
}
else {
nkwargs = 0;
}
if (nkwargs == 0 && minkw == 0 && minpos <= nargs && nargs <= maxpos) {
/* Fast path. */
return args;
}
if (nargs + nkwargs > maxargs) {
/* Adding "keyword" (when nargs == 0) prevents producing wrong error
messages in some special cases (see bpo-31229). */
PyErr_Format(PyExc_TypeError,
"%.200s%s takes at most %d %sargument%s (%zd given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
maxargs,
(nargs == 0) ? "keyword " : "",
(maxargs == 1) ? "" : "s",
nargs + nkwargs);
return NULL;
}
if (nargs > maxpos) {
if (maxpos == 0) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes no positional arguments",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()");
}
else {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional argument%s (%zd given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
(minpos < maxpos) ? "at most" : "exactly",
maxpos,
(maxpos == 1) ? "" : "s",
nargs);
}
return NULL;
}
if (nargs < minposonly) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional argument%s"
" (%zd given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
minposonly < maxpos ? "at least" : "exactly",
minposonly,
minposonly == 1 ? "" : "s",
nargs);
return NULL;
}
/* copy tuple args */
for (i = 0; i < nargs; i++) {
buf[i] = args[i];
}
/* copy keyword args using kwtuple to drive process */
for (i = Py_MAX((int)nargs, posonly); i < maxargs; i++) {
PyObject *current_arg;
if (nkwargs) {
keyword = PyTuple_GET_ITEM(kwtuple, i - posonly);
if (kwargs != NULL) {
if (PyDict_GetItemRef(kwargs, keyword, &current_arg) < 0) {
return NULL;
}
}
else {
current_arg = find_keyword(kwnames, kwstack, keyword);
}
}
else if (i >= reqlimit) {
break;
}
else {
current_arg = NULL;
}
buf[i] = current_arg;
if (current_arg) {
Py_DECREF(current_arg);
--nkwargs;
}
else if (i < minpos || (maxpos <= i && i < reqlimit)) {
/* Less arguments than required */
keyword = PyTuple_GET_ITEM(kwtuple, i - posonly);
PyErr_Format(PyExc_TypeError, "%.200s%s missing required "
"argument '%U' (pos %d)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
keyword, i+1);
return NULL;
}
}
if (nkwargs > 0) {
/* make sure there are no arguments given by name and position */
for (i = posonly; i < nargs; i++) {
PyObject *current_arg;
keyword = PyTuple_GET_ITEM(kwtuple, i - posonly);
if (kwargs != NULL) {
if (PyDict_GetItemRef(kwargs, keyword, &current_arg) < 0) {
return NULL;
}
}
else {
current_arg = find_keyword(kwnames, kwstack, keyword);
}
if (current_arg) {
Py_DECREF(current_arg);
/* arg present in tuple and in dict */
PyErr_Format(PyExc_TypeError,
"argument for %.200s%s given by name ('%U') "
"and position (%d)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
keyword, i+1);
return NULL;
}
}
error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname);
return NULL;
}
return buf;
}
PyObject * const *
_PyArg_UnpackKeywordsWithVararg(PyObject *const *args, Py_ssize_t nargs,
PyObject *kwargs, PyObject *kwnames,
struct _PyArg_Parser *parser,
int minpos, int maxpos, int minkw,
int vararg, PyObject **buf)
{
PyObject *kwtuple;
PyObject *keyword;
Py_ssize_t varargssize = 0;
int i, posonly, minposonly, maxargs;
int reqlimit = minkw ? maxpos + minkw : minpos;
Py_ssize_t nkwargs;
PyObject * const *kwstack = NULL;
assert(kwargs == NULL || PyDict_Check(kwargs));
assert(kwargs == NULL || kwnames == NULL);
if (parser == NULL) {
PyErr_BadInternalCall();
return NULL;
}
if (kwnames != NULL && !PyTuple_Check(kwnames)) {
PyErr_BadInternalCall();
return NULL;
}
if (args == NULL && nargs == 0) {
args = buf;
}
if (parser_init(parser) < 0) {
return NULL;
}
kwtuple = parser->kwtuple;
posonly = parser->pos;
minposonly = Py_MIN(posonly, minpos);
maxargs = posonly + (int)PyTuple_GET_SIZE(kwtuple);
if (kwargs != NULL) {
nkwargs = PyDict_GET_SIZE(kwargs);
}
else if (kwnames != NULL) {
nkwargs = PyTuple_GET_SIZE(kwnames);
kwstack = args + nargs;
}
else {
nkwargs = 0;
}
if (nargs < minposonly) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional argument%s"
" (%zd given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
minposonly < maxpos ? "at least" : "exactly",
minposonly,
minposonly == 1 ? "" : "s",
nargs);
return NULL;
}
/* create varargs tuple */
varargssize = nargs - maxpos;
if (varargssize < 0) {
varargssize = 0;
}
buf[vararg] = PyTuple_New(varargssize);
if (!buf[vararg]) {
return NULL;
}
/* copy tuple args */
for (i = 0; i < nargs; i++) {
if (i >= vararg) {
PyTuple_SET_ITEM(buf[vararg], i - vararg, Py_NewRef(args[i]));
continue;
}
else {
buf[i] = args[i];
}
}
/* copy keyword args using kwtuple to drive process */
for (i = Py_MAX((int)nargs, posonly) - Py_SAFE_DOWNCAST(varargssize, Py_ssize_t, int); i < maxargs; i++) {
PyObject *current_arg;
if (nkwargs) {
keyword = PyTuple_GET_ITEM(kwtuple, i - posonly);
if (kwargs != NULL) {
if (PyDict_GetItemRef(kwargs, keyword, &current_arg) < 0) {
goto exit;
}
}
else {
current_arg = find_keyword(kwnames, kwstack, keyword);
}
}
else {
current_arg = NULL;
}
/* If an arguments is passed in as a keyword argument,
* it should be placed before `buf[vararg]`.
*
* For example:
* def f(a, /, b, *args):
* pass
* f(1, b=2)
*
* This `buf` array should be: [1, 2, NULL].
* In this case, nargs < vararg.
*
* Otherwise, we leave a place at `buf[vararg]` for vararg tuple
* so the index is `i + 1`. */
if (i < vararg) {
buf[i] = current_arg;
}
else {
buf[i + 1] = current_arg;
}
if (current_arg) {
Py_DECREF(current_arg);
--nkwargs;
}
else if (i < minpos || (maxpos <= i && i < reqlimit)) {
/* Less arguments than required */
keyword = PyTuple_GET_ITEM(kwtuple, i - posonly);
PyErr_Format(PyExc_TypeError, "%.200s%s missing required "
"argument '%U' (pos %d)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
keyword, i+1);
goto exit;
}
}
if (nkwargs > 0) {
error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname);
goto exit;
}
return buf;
exit:
Py_XDECREF(buf[vararg]);
return NULL;
}
static const char *
skipitem(const char **p_format, va_list *p_va, int flags)
{
const char *format = *p_format;
char c = *format++;
switch (c) {
/*
* codes that take a single data pointer as an argument
* (the type of the pointer is 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 */
case 'L': /* long long */
case 'K': /* long long sized bitfield */
case 'n': /* Py_ssize_t */
case 'f': /* float */
case 'd': /* double */
case 'D': /* complex double */
case 'c': /* char */
case 'C': /* unicode char */
case 'p': /* boolean predicate */
case 'S': /* string object */
case 'Y': /* string object */
case 'U': /* unicode string object */
{
if (p_va != NULL) {
(void) va_arg(*p_va, void *);
}
break;
}
/* string codes */
case 'e': /* string with encoding */
{
if (p_va != NULL) {
(void) va_arg(*p_va, const char *);
}
if (!(*format == 's' || *format == 't'))
/* after 'e', only 's' and 't' is allowed */
goto err;
format++;
}
/* fall through */
case 's': /* string */
case 'z': /* string or None */
case 'y': /* bytes */
case 'w': /* buffer, read-write */
{
if (p_va != NULL) {
(void) va_arg(*p_va, char **);
}
if (c == 'w' && *format != '*')
{
/* after 'w', only '*' is allowed */
goto err;
}
if (*format == '#') {
if (p_va != NULL) {
(void) va_arg(*p_va, Py_ssize_t *);
}
format++;
} else if ((c == 's' || c == 'z' || c == 'y' || c == 'w')
&& *format == '*')
{
format++;
}
break;
}
case 'O': /* object */
{
if (*format == '!') {
format++;
if (p_va != NULL) {
(void) va_arg(*p_va, PyTypeObject*);
(void) va_arg(*p_va, PyObject **);
}
}
else if (*format == '&') {
typedef int (*converter)(PyObject *, void *);
if (p_va != NULL) {
(void) va_arg(*p_va, converter);
(void) va_arg(*p_va, void *);
}
format++;
}
else {
if (p_va != NULL) {
(void) va_arg(*p_va, PyObject **);
}
}
break;
}
case '(': /* bypass tuple, not handled at all previously */
{
const 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;
}
#undef _PyArg_CheckPositional
int
_PyArg_CheckPositional(const char *name, Py_ssize_t nargs,
Py_ssize_t min, Py_ssize_t max)
{
assert(min >= 0);
assert(min <= max);
if (nargs < min) {
if (name != NULL)
PyErr_Format(
PyExc_TypeError,
"%.200s expected %s%zd argument%s, got %zd",
name, (min == max ? "" : "at least "), min, min == 1 ? "" : "s", nargs);
else
PyErr_Format(
PyExc_TypeError,
"unpacked tuple should have %s%zd element%s,"
" but has %zd",
(min == max ? "" : "at least "), min, min == 1 ? "" : "s", nargs);
return 0;
}
if (nargs == 0) {
return 1;
}
if (nargs > max) {
if (name != NULL)
PyErr_Format(
PyExc_TypeError,
"%.200s expected %s%zd argument%s, got %zd",
name, (min == max ? "" : "at most "), max, max == 1 ? "" : "s", nargs);
else
PyErr_Format(
PyExc_TypeError,
"unpacked tuple should have %s%zd element%s,"
" but has %zd",
(min == max ? "" : "at most "), max, max == 1 ? "" : "s", nargs);
return 0;
}
return 1;
}
static int
unpack_stack(PyObject *const *args, Py_ssize_t nargs, const char *name,
Py_ssize_t min, Py_ssize_t max, va_list vargs)
{
Py_ssize_t i;
PyObject **o;
if (!_PyArg_CheckPositional(name, nargs, min, max)) {
return 0;
}
for (i = 0; i < nargs; i++) {
o = va_arg(vargs, PyObject **);
*o = args[i];
}
return 1;
}
int
PyArg_UnpackTuple(PyObject *args, const char *name, Py_ssize_t min, Py_ssize_t max, ...)
{
PyObject **stack;
Py_ssize_t nargs;
int retval;
va_list vargs;
if (!PyTuple_Check(args)) {
PyErr_SetString(PyExc_SystemError,
"PyArg_UnpackTuple() argument list is not a tuple");
return 0;
}
stack = _PyTuple_ITEMS(args);
nargs = PyTuple_GET_SIZE(args);
va_start(vargs, max);
retval = unpack_stack(stack, nargs, name, min, max, vargs);
va_end(vargs);
return retval;
}
int
_PyArg_UnpackStack(PyObject *const *args, Py_ssize_t nargs, const char *name,
Py_ssize_t min, Py_ssize_t max, ...)
{
int retval;
va_list vargs;
va_start(vargs, max);
retval = unpack_stack(args, nargs, name, min, max, vargs);
va_end(vargs);
return retval;
}
#undef _PyArg_NoKeywords
#undef _PyArg_NoKwnames
#undef _PyArg_NoPositional
/* For type constructors that don't take keyword args
*
* Sets a TypeError and returns 0 if the args/kwargs is
* not empty, returns 1 otherwise
*/
int
_PyArg_NoKeywords(const char *funcname, PyObject *kwargs)
{
if (kwargs == NULL) {
return 1;
}
if (!PyDict_CheckExact(kwargs)) {
PyErr_BadInternalCall();
return 0;
}
if (PyDict_GET_SIZE(kwargs) == 0) {
return 1;
}
PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
funcname);
return 0;
}
int
_PyArg_NoPositional(const char *funcname, PyObject *args)
{
if (args == NULL)
return 1;
if (!PyTuple_CheckExact(args)) {
PyErr_BadInternalCall();
return 0;
}
if (PyTuple_GET_SIZE(args) == 0)
return 1;
PyErr_Format(PyExc_TypeError, "%.200s() takes no positional arguments",
funcname);
return 0;
}
int
_PyArg_NoKwnames(const char *funcname, PyObject *kwnames)
{
if (kwnames == NULL) {
return 1;
}
assert(PyTuple_CheckExact(kwnames));
if (PyTuple_GET_SIZE(kwnames) == 0) {
return 1;
}
PyErr_Format(PyExc_TypeError, "%s() takes no keyword arguments", funcname);
return 0;
}
void
_PyArg_Fini(void)
{
struct _PyArg_Parser *tmp, *s = _PyRuntime.getargs.static_parsers;
while (s) {
tmp = s->next;
s->next = NULL;
parser_clear(s);
s = tmp;
}
_PyRuntime.getargs.static_parsers = NULL;
}
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