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2861 lines (2558 loc) · 85 KB
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Copy pathgetargs.c
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2861 lines (2558 loc) · 85 KB
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/* New getargs implementation */
#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_tuple.h" // _PyTuple_ITEMS()
/* 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 *, char **, ...);
PyAPI_FUNC(int) _PyArg_VaParse_SizeT(PyObject *, const char *, va_list);
PyAPI_FUNC(int) _PyArg_VaParseTupleAndKeywords_SizeT(PyObject *, PyObject *,
const char *, char **, 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, int, 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 *, char **, 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, int toplevel,
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))
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" : Py_TYPE(arg)->tp_name);
return msgbuf;
}
len = PySequence_Size(arg);
if (len != n) {
levels[0] = 0;
if (toplevel) {
PyOS_snprintf(msgbuf, bufsize,
"expected %d argument%s, not %zd",
n,
n == 1 ? "" : "s",
len);
}
else {
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;
10BC8
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, 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().
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 */
char *p = va_arg(*p_va, 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 */
char *p = va_arg(*p_va, 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);
}