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cpython/Python/getargs.c

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/* 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
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(PyObject *, const char *, va_list *, int);
static void seterror(Py_ssize_t, const char *, int *, const char *, const char *);
static char *convertitem(PyObject *, const char **, va_list *, int, int *,
char *, size_t, freelist_t *);
static char *converttuple(PyObject *, const char **, va_list *, int,
int *, char *, size_t, int, freelist_t *);
static char *convertsimple(PyObject *, const char **, va_list *, int, char *,
size_t, freelist_t *);
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;
Py_VA_COPY(lva, va);
return vgetargs1(args, format, &lva, 0);
}
int
_PyArg_VaParse_SizeT(PyObject *args, char *format, va_list va)
{
va_list lva;
Py_VA_COPY(lva, va);
return vgetargs1(args, format, &lva, FLAG_SIZE_T);
}
/* Handle cleanup of allocated memory in case of exception */
static int
cleanup_ptr(PyObject *self, void *ptr)
{
if (ptr) {
PyMem_FREE(ptr);
}
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(PyObject *args, const char *format, va_list *p_va, int flags)
{
char msgbuf[256];
int levels[32];
freelistentry_t static_entries[STATIC_FREELIST_ENTRIES];
freelist_t freelist = {static_entries, 0, 0};
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;
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;
case '|':
if (level == 0)
min = max;
break;
default:
if (level == 0) {
if (Py_ISALPHA(Py_CHARMASK(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 (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 (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(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 (!PyTuple_Check(args)) {
PyErr_SetString(PyExc_SystemError,
"new style getargs format but argument is not a tuple");
return cleanreturn(0, &freelist);
}
len = PyTuple_GET_SIZE(args);
if (len < min || max < len) {
if (message == NULL)
PyErr_Format(PyExc_TypeError,
"%.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));
else
PyErr_SetString(PyExc_TypeError, message);
return cleanreturn(0, &freelist);
}
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, msg);
return cleanreturn(0, &freelist);
}
}
if (*format != '\0' && !Py_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(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 %" PY_FORMAT_SIZE_T "d", 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;
}
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,
freelist_t *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 && Py_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, freelist_t *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;
}
/* 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, freelist_t *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 { \
if (INT_MAX < s) { \
PyErr_SetString(PyExc_OverflowError, \
"size does not fit in an int"); \
return converterr("", arg, msgbuf, bufsize); \
} \
*q = (int)s; \
}
#define BUFFER_LEN ((flags & FLAG_SIZE_T) ? *q2:*q)
#define RETURN_ERR_OCCURRED return msgbuf
const char *format = *p_format;
char c = *format++;
char *sarg;
switch (c) {
case 'b': { /* unsigned byte -- very short int */
char *p = va_arg(*p_va, char *);
long ival;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
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 */
char *p = va_arg(*p_va, char *);
long ival;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
ival = PyLong_AsUnsignedLongMask(arg);
if (ival == -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;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
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 *);
long ival;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
ival = PyLong_AsUnsignedLongMask(arg);
if (ival == -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;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
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 int ival;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
ival = (unsigned int)PyLong_AsUnsignedLongMask(arg);
if (ival == (unsigned int)-1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
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_ERR_OCCURRED;
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;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
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("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;
if (float_argument_error(arg))
RETURN_ERR_OCCURRED;
ival = PyLong_AsLongLong(arg);
if (ival == (PY_LONG_LONG)-1 && PyErr_Occurred())
RETURN_ERR_OCCURRED;
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_ERR_OCCURRED;
else
*p = (float) dval;
break;
}
case 'd': {/* double */
double *p = va_arg(*p_va, double *);
double dval = PyFloat_AsDouble(arg);
if (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;
void *data;
if (!PyUnicode_Check(arg))
return converterr("a unicode character", arg, msgbuf, bufsize);
if (PyUnicode_READY(arg))
RETURN_ERR_OCCURRED;
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 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++;
if (addcleanup(p, freelist, cleanup_buffer)) {
return converterr(
"(cleanup problem)",
arg, msgbuf, bufsize);
}
break;
}
count = convertbuffer(arg, p, &buf);
if (count < 0)
return converterr(buf, arg, msgbuf, bufsize);
if (*format == '#') {
FETCH_SIZE;
STORE_SIZE(count);
format++;
} else {
if (strlen(*p) != count)
return converterr(
"bytes without null bytes",
arg, msgbuf, bufsize);
}
break;
}
case 's': /* text string */
case 'z': /* text string 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, sarg, len, 1, 0);
}
else { /* any buffer-like object */
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 == '#') { /* any buffer-like object */
/* "s#" or "z#" */
void **p = (void **)va_arg(*p_va, char **);
FETCH_SIZE;
if (c == 'z' && arg == Py_None) {
*p = NULL;
STORE_SIZE(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;
STORE_SIZE(len);
}
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 {
/* "s" or "z" */
char **p = va_arg(*p_va, 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);
*p = sarg;
}
else
return converterr(c == 'z' ? "str or None" : "str",
arg, msgbuf, bufsize);
if (*p != NULL && sarg != NULL && (Py_ssize_t) strlen(*p) != len)
return converterr(
c == 'z' ? "str without null characters or None"
: "str without null characters",
arg, msgbuf, bufsize);
}
break;
}
case 'u': /* raw unicode buffer (Py_UNICODE *) */
case 'Z': /* raw unicode buffer or None */
{
Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);
if (*format == '#') { /* any buffer-like object */
/* "s#" or "Z#" */
FETCH_SIZE;
if (c == 'Z' && arg == Py_None) {
*p = NULL;
STORE_SIZE(0);
}
else if (PyUnicode_Check(arg)) {
Py_ssize_t len;
*p = PyUnicode_AsUnicodeAndSize(arg, &len);
if (*p == NULL)
RETURN_ERR_OCCURRED;
STORE_SIZE(len);
}
else
return converterr("str or None", arg, msgbuf, bufsize);
format++;
} else {
/* "s" or "Z" */
if (c == 'Z' && arg == Py_None)
*p = NULL;
else if (PyUnicode_Check(arg)) {
Py_ssize_t len;
*p = PyUnicode_AsUnicodeAndSize(arg, &len);
if (*p == NULL)
RETURN_ERR_OCCURRED;
if (Py_UNICODE_strlen(*p) != len)
return converterr(
"str without null characters or None",
arg, msgbuf, bufsize);
} 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 = 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);
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 > 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);
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)) {
if (PyUnicode_READY(arg) == -1)
RETURN_ERR_OCCURRED;
*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 == '&') {
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. */
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')) {
PyBuffer_Release((Py_buffer*)p);
return converterr("contiguous buffer", arg, msgbuf, bufsize);
}
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 FETCH_SIZE
#undef STORE_SIZE
#undef BUFFER_LEN
#undef RETURN_ERR_OCCURRED
}
static Py_ssize_t
convertbuffer(PyObject *arg, void **p, 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 pinned buffer";
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, char **errmsg)
{
if (PyObject_GetBuffer(arg, view, PyBUF_SIMPLE) != 0) {
*errmsg = "bytes or buffer";
return -1;
}
if (!PyBuffer_IsContiguous(view, 'C')) {
PyBuffer_Release(view);
*errmsg = "contiguous buffer";
return -1;
}
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;
}
Py_VA_COPY(lva, va);
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;
}
Py_VA_COPY(lva, va);
retval = vgetargskeywords(args, keywords, format,
kwlist, &lva, FLAG_SIZE_T);
return retval;
}
int
PyArg_ValidateKeywordArguments(PyObject *kwargs)
{
if (!PyDict_Check(kwargs)) {
PyErr_BadInternalCall();
return 0;
}
if (!_PyDict_HasOnlyStringKeys(kwargs)) {
PyErr_SetString(PyExc_TypeError,
"keyword arguments must be strings");
return 0;
}
return 1;
}
#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 max = INT_MAX;
int i, len, nargs, nkeywords;
PyObject *current_arg;
freelistentry_t static_entries[STATIC_FREELIST_ENTRIES];
freelist_t freelist = {static_entries, 0, 0};
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;
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);
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 cleanreturn(0, &freelist);
}
/* 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 == '|') {
if (min != INT_MAX) {
PyErr_SetString(PyExc_RuntimeError,
"Invalid format string (| specified twice)");
return cleanreturn(0, &freelist);
}
min = i;
format++;
if (max != INT_MAX) {
PyErr_SetString(PyExc_RuntimeError,
"Invalid format string ($ before |)");
return cleanreturn(0, &freelist);
}
}
if (*format == '$') {
if (max != INT_MAX) {
PyErr_SetString(PyExc_RuntimeError,
"Invalid format string ($ specified twice)");
return cleanreturn(0, &freelist);
}
max = i;
format++;
if (max < nargs) {
PyErr_Format(PyExc_TypeError,
"Function takes %s %d positional arguments"
" (%d given)",
(min != INT_MAX) ? "at most" : "exactly",
max, nargs);
return cleanreturn(0, &freelist);
}
}
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) && (*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;
if (!PyUnicode_Check(key)) {
PyErr_SetString(PyExc_TypeError,
"keywords must be strings");
return cleanreturn(0, &freelist);
}
/* check that _PyUnicode_AsString() result is not NULL */
for (i = 0; i < len; i++) {
if (!PyUnicode_CompareWithASCIIString(key, kwlist[i])) {
match = 1;
break;
}
}
if (!match) {
PyErr_Format(PyExc_TypeError,
"'%U' is an invalid keyword "
"argument for this function",
key);
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) {
/*
* 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 */
#ifdef HAVE_LONG_LONG
case 'L': /* PY_LONG_LONG */
case 'K': /* PY_LONG_LONG sized bitfield */
#endif
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 */
{
(void) va_arg(*p_va, void *);
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 'Z': /* unicode string or None */
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;
}
case 'O': /* object */
{
if (*format == '!') {
format++;
(void) va_arg(*p_va, PyTypeObject*);
(void) va_arg(*p_va, PyObject **);
}
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)) {
va_end(vargs);
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
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