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stringobject.c
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3864 lines (3482 loc) · 90.5 KB
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/* String object implementation */
#include "Python.h"
#include <ctype.h>
#ifdef COUNT_ALLOCS
int null_strings, one_strings;
#endif
#if !defined(HAVE_LIMITS_H) && !defined(UCHAR_MAX)
#define UCHAR_MAX 255
#endif
static PyStringObject *characters[UCHAR_MAX + 1];
#ifndef DONT_SHARE_SHORT_STRINGS
static PyStringObject *nullstring;
#endif
/*
PyString_FromStringAndSize() and PyString_FromString() try in certain cases
to share string objects. When the size of the string is zero, these
routines always return a pointer to the same string object; when the size
is one, they return a pointer to an already existing object if the contents
of the string is known. For PyString_FromString() this is always the case,
for PyString_FromStringAndSize() this is the case when the first argument
in not NULL.
A common practice of allocating a string and then filling it in or changing
it must be done carefully. It is only allowed to change the contents of
the string if the object was gotten from PyString_FromStringAndSize() with
a NULL first argument, because in the future these routines may try to do
even more sharing of objects.
The string in the `str' parameter does not have to be null-character
terminated. (Therefore it is safe to construct a substring by using
`PyString_FromStringAndSize(origstring, substrlen)'.)
The parameter `size' denotes number of characters to allocate, not
counting the null terminating character. If the `str' argument is
not NULL, then it points to a of length `size'. For
PyString_FromString, this string must be null-terminated.
The member `op->ob_size' denotes the number of bytes of data in the string,
not counting the null terminating character, and is therefore equal to the
`size' parameter.
*/
PyObject *
PyString_FromStringAndSize(const char *str, int size)
{
register PyStringObject *op;
#ifndef DONT_SHARE_SHORT_STRINGS
if (size == 0 && (op = nullstring) != NULL) {
#ifdef COUNT_ALLOCS
null_strings++;
#endif
Py_INCREF(op);
return (PyObject *)op;
}
if (size == 1 && str != NULL &&
(op = characters[*str & UCHAR_MAX]) != NULL)
{
#ifdef COUNT_ALLOCS
one_strings++;
#endif
Py_INCREF(op);
return (PyObject *)op;
}
#endif /* DONT_SHARE_SHORT_STRINGS */
/* PyObject_NewVar is inlined */
op = (PyStringObject *)
PyObject_MALLOC(sizeof(PyStringObject) + size * sizeof(char));
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
if (str != NULL)
memcpy(op->ob_sval, str, size);
op->ob_sval[size] = '\0';
#ifndef DONT_SHARE_SHORT_STRINGS
if (size == 0) {
PyObject *t = (PyObject *)op;
PyString_InternInPlace(&t);
op = (PyStringObject *)t;
nullstring = op;
Py_INCREF(op);
} else if (size == 1 && str != NULL) {
PyObject *t = (PyObject *)op;
PyString_InternInPlace(&t);
op = (PyStringObject *)t;
characters[*str & UCHAR_MAX] = op;
Py_INCREF(op);
}
#endif
return (PyObject *) op;
}
PyObject *
PyString_FromString(const char *str)
{
register size_t size;
register PyStringObject *op;
assert(str != NULL);
size = strlen(str);
if (size > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"string is too long for a Python string");
return NULL;
}
#ifndef DONT_SHARE_SHORT_STRINGS
if (size == 0 && (op = nullstring) != NULL) {
#ifdef COUNT_ALLOCS
null_strings++;
#endif
Py_INCREF(op);
return (PyObject *)op;
}
if (size == 1 && (op = characters[*str & UCHAR_MAX]) != NULL) {
#ifdef COUNT_ALLOCS
one_strings++;
#endif
Py_INCREF(op);
return (PyObject *)op;
}
#endif /* DONT_SHARE_SHORT_STRINGS */
/* PyObject_NewVar is inlined */
op = (PyStringObject *)
PyObject_MALLOC(sizeof(PyStringObject) + size * sizeof(char));
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
memcpy(op->ob_sval, str, size+1);
#ifndef DONT_SHARE_SHORT_STRINGS
if (size == 0) {
PyObject *t = (PyObject *)op;
PyString_InternInPlace(&t);
op = (PyStringObject *)t;
nullstring = op;
Py_INCREF(op);
} else if (size == 1) {
PyObject *t = (PyObject *)op;
PyString_InternInPlace(&t);
op = (PyStringObject *)t;
characters[*str & UCHAR_MAX] = op;
Py_INCREF(op);
}
#endif
return (PyObject *) op;
}
PyObject *
PyString_FromFormatV(const char *format, va_list vargs)
{
va_list count;
int n = 0;
const char* f;
char *s;
PyObject* string;
#ifdef VA_LIST_IS_ARRAY
memcpy(count, vargs, sizeof(va_list));
#else
#ifdef __va_copy
__va_copy(count, vargs);
#else
count = vargs;
#endif
#endif
/* step 1: figure out how large a buffer we need */
for (f = format; *f; f++) {
if (*f == '%') {
const char* p = f;
while (*++f && *f != '%' && !isalpha(Py_CHARMASK(*f)))
;
/* skip the 'l' in %ld, since it doesn't change the
width. although only %d is supported (see
"expand" section below), others can be easily
added */
if (*f == 'l' && *(f+1) == 'd')
++f;
switch (*f) {
case 'c':
(void)va_arg(count, int);
/* fall through... */
case '%':
n++;
break;
case 'd': case 'i': case 'x':
(void) va_arg(count, int);
/* 20 bytes is enough to hold a 64-bit
integer. Decimal takes the most space.
This isn't enough for octal. */
n += 20;
break;
case 's':
s = va_arg(count, char*);
n += strlen(s);
break;
case 'p':
(void) va_arg(count, int);
/* maximum 64-bit pointer representation:
* 0xffffffffffffffff
* so 19 characters is enough.
* XXX I count 18 -- what's the extra for?
*/
n += 19;
break;
default:
/* if we stumble upon an unknown
formatting code, copy the rest of
the format string to the output
string. (we cannot just skip the
code, since there's no way to know
what's in the argument list) */
n += strlen(p);
goto expand;
}
} else
n++;
}
expand:
/* step 2: fill the buffer */
/* Since we've analyzed how much space we need for the worst case,
use sprintf directly instead of the slower PyOS_snprintf. */
string = PyString_FromStringAndSize(NULL, n);
if (!string)
return NULL;
s = PyString_AsString(string);
for (f = format; *f; f++) {
if (*f == '%') {
const char* p = f++;
int i, longflag = 0;
/* parse the width.precision part (we're only
interested in the precision value, if any) */
n = 0;
while (isdigit(Py_CHARMASK(*f)))
n = (n*10) + *f++ - '0';
if (*f == '.') {
f++;
n = 0;
while (isdigit(Py_CHARMASK(*f)))
n = (n*10) + *f++ - '0';
}
while (*f && *f != '%' && !isalpha(Py_CHARMASK(*f)))
f++;
/* handle the long flag, but only for %ld. others
can be added when necessary. */
if (*f == 'l' && *(f+1) == 'd') {
longflag = 1;
++f;
}
switch (*f) {
case 'c':
*s++ = va_arg(vargs, int);
break;
case 'd':
if (longflag)
sprintf(s, "%ld", va_arg(vargs, long));
else
sprintf(s, "%d", va_arg(vargs, int));
s += strlen(s);
break;
case 'i':
sprintf(s, "%i", va_arg(vargs, int));
s += strlen(s);
break;
case 'x':
sprintf(s, "%x", va_arg(vargs, int));
s += strlen(s);
break;
case 's':
p = va_arg(vargs, char*);
i = strlen(p);
if (n > 0 && i > n)
i = n;
memcpy(s, p, i);
s += i;
break;
case 'p':
sprintf(s, "%p", va_arg(vargs, void*));
/* %p is ill-defined: ensure leading 0x. */
if (s[1] == 'X')
s[1] = 'x';
else if (s[1] != 'x') {
memmove(s+2, s, strlen(s)+1);
s[0] = '0';
s[1] = 'x';
}
s += strlen(s);
break;
case '%':
*s++ = '%';
break;
default:
strcpy(s, p);
s += strlen(s);
goto end;
}
} else
*s++ = *f;
}
end:
_PyString_Resize(&string, s - PyString_AS_STRING(string));
return string;
}
PyObject *
PyString_FromFormat(const char *format, ...)
{
PyObject* ret;
va_list vargs;
#ifdef HAVE_STDARG_PROTOTYPES
va_start(vargs, format);
#else
va_start(vargs);
#endif
ret = PyString_FromFormatV(format, vargs);
va_end(vargs);
return ret;
}
PyObject *PyString_Decode(const char *s,
int size,
const char *encoding,
const char *errors)
{
PyObject *v, *str;
str = PyString_FromStringAndSize(s, size);
if (str == NULL)
return NULL;
v = PyString_AsDecodedString(str, encoding, errors);
Py_DECREF(str);
return v;
}
PyObject *PyString_AsDecodedObject(PyObject *str,
const char *encoding,
const char *errors)
{
PyObject *v;
if (!PyString_Check(str)) {
PyErr_BadArgument();
goto onError;
}
if (encoding == NULL) {
#ifdef Py_USING_UNICODE
encoding = PyUnicode_GetDefaultEncoding();
#else
PyErr_SetString(PyExc_ValueError, "no encoding specified");
goto onError;
#endif
}
/* Decode via the codec registry */
v = PyCodec_Decode(str, encoding, errors);
if (v == NULL)
goto onError;
return v;
onError:
return NULL;
}
PyObject *PyString_AsDecodedString(PyObject *str,
const char *encoding,
const char *errors)
{
PyObject *v;
v = PyString_AsDecodedObject(str, encoding, errors);
if (v == NULL)
goto onError;
#ifdef Py_USING_UNICODE
/* Convert Unicode to a string using the default encoding */
if (PyUnicode_Check(v)) {
PyObject *temp = v;
v = PyUnicode_AsEncodedString(v, NULL, NULL);
Py_DECREF(temp);
if (v == NULL)
goto onError;
}
#endif
if (!PyString_Check(v)) {
PyErr_Format(PyExc_TypeError,
"decoder did not return a string object (type=%.400s)",
v->ob_type->tp_name);
Py_DECREF(v);
goto onError;
}
return v;
onError:
return NULL;
}
PyObject *PyString_Encode(const char *s,
int size,
const char *encoding,
const char *errors)
{
PyObject *v, *str;
str = PyString_FromStringAndSize(s, size);
if (str == NULL)
return NULL;
v = PyString_AsEncodedString(str, encoding, errors);
Py_DECREF(str);
return v;
}
PyObject *PyString_AsEncodedObject(PyObject *str,
const char *encoding,
const char *errors)
{
PyObject *v;
if (!PyString_Check(str)) {
PyErr_BadArgument();
goto onError;
}
if (encoding == NULL) {
#ifdef Py_USING_UNICODE
encoding = PyUnicode_GetDefaultEncoding();
#else
PyErr_SetString(PyExc_ValueError, "no encoding specified");
goto onError;
#endif
}
/* Encode via the codec registry */
v = PyCodec_Encode(str, encoding, errors);
if (v == NULL)
goto onError;
return v;
onError:
return NULL;
}
PyObject *PyString_AsEncodedString(PyObject *str,
const char *encoding,
const char *errors)
{
PyObject *v;
v = PyString_AsEncodedObject(str, encoding, errors);
if (v == NULL)
goto onError;
#ifdef Py_USING_UNICODE
/* Convert Unicode to a string using the default encoding */
if (PyUnicode_Check(v)) {
PyObject *temp = v;
v = PyUnicode_AsEncodedString(v, NULL, NULL);
Py_DECREF(temp);
if (v == NULL)
goto onError;
}
#endif
if (!PyString_Check(v)) {
PyErr_Format(PyExc_TypeError,
"encoder did not return a string object (type=%.400s)",
v->ob_type->tp_name);
Py_DECREF(v);
goto onError;
}
return v;
onError:
return NULL;
}
static void
string_dealloc(PyObject *op)
{
op->ob_type->tp_free(op);
}
static int
string_getsize(register PyObject *op)
{
char *s;
int len;
if (PyString_AsStringAndSize(op, &s, &len))
return -1;
return len;
}
static /*const*/ char *
string_getbuffer(register PyObject *op)
{
char *s;
int len;
if (PyString_AsStringAndSize(op, &s, &len))
return NULL;
return s;
}
int
PyString_Size(register PyObject *op)
{
if (!PyString_Check(op))
return string_getsize(op);
return ((PyStringObject *)op) -> ob_size;
}
/*const*/ char *
PyString_AsString(register PyObject *op)
{
if (!PyString_Check(op))
return string_getbuffer(op);
return ((PyStringObject *)op) -> ob_sval;
}
int
PyString_AsStringAndSize(register PyObject *obj,
register char **s,
register int *len)
{
if (s == NULL) {
PyErr_BadInternalCall();
return -1;
}
if (!PyString_Check(obj)) {
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(obj)) {
obj = _PyUnicode_AsDefaultEncodedString(obj, NULL);
if (obj == NULL)
return -1;
}
else
#endif
{
PyErr_Format(PyExc_TypeError,
"expected string or Unicode object, "
"%.200s found", obj->ob_type->tp_name);
return -1;
}
}
*s = PyString_AS_STRING(obj);
if (len != NULL)
*len = PyString_GET_SIZE(obj);
else if ((int)strlen(*s) != PyString_GET_SIZE(obj)) {
PyErr_SetString(PyExc_TypeError,
"expected string without null bytes");
return -1;
}
return 0;
}
/* Methods */
static int
string_print(PyStringObject *op, FILE *fp, int flags)
{
int i;
char c;
int quote;
/* XXX Ought to check for interrupts when writing long strings */
if (! PyString_CheckExact(op)) {
int ret;
/* A str subclass may have its own __str__ method. */
op = (PyStringObject *) PyObject_Str((PyObject *)op);
if (op == NULL)
return -1;
ret = string_print(op, fp, flags);
Py_DECREF(op);
return ret;
}
if (flags & Py_PRINT_RAW) {
fwrite(op->ob_sval, 1, (int) op->ob_size, fp);
return 0;
}
/* figure out which quote to use; single is preferred */
quote = '\'';
if (strchr(op->ob_sval, '\'') &&
!strchr(op->ob_sval, '"'))
quote = '"';
fputc(quote, fp);
for (i = 0; i < op->ob_size; i++) {
c = op->ob_sval[i];
if (c == quote || c == '\\')
fprintf(fp, "\\%c", c);
else if (c == '\t')
fprintf(fp, "\\t");
else if (c == '\n')
fprintf(fp, "\\n");
else if (c == '\r')
fprintf(fp, "\\r");
else if (c < ' ' || c >= 0x7f)
fprintf(fp, "\\x%02x", c & 0xff);
else
fputc(c, fp);
}
fputc(quote, fp);
return 0;
}
static PyObject *
string_repr(register PyStringObject *op)
{
size_t newsize = 2 + 4 * op->ob_size * sizeof(char);
PyObject *v;
if (newsize > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"string is too large to make repr");
}
v = PyString_FromStringAndSize((char *)NULL, newsize);
if (v == NULL) {
return NULL;
}
else {
register int i;
register char c;
register char *p;
int quote;
/* figure out which quote to use; single is preferred */
quote = '\'';
if (strchr(op->ob_sval, '\'') &&
!strchr(op->ob_sval, '"'))
quote = '"';
p = PyString_AS_STRING(v);
*p++ = quote;
for (i = 0; i < op->ob_size; i++) {
/* There's at least enough room for a hex escape
and a closing quote. */
assert(newsize - (p - PyString_AS_STRING(v)) >= 5);
c = op->ob_sval[i];
if (c == quote || c == '\\')
*p++ = '\\', *p++ = c;
else if (c == '\t')
*p++ = '\\', *p++ = 't';
else if (c == '\n')
*p++ = '\\', *p++ = 'n';
else if (c == '\r')
*p++ = '\\', *p++ = 'r';
else if (c < ' ' || c >= 0x7f) {
/* For performance, we don't want to call
PyOS_snprintf here (extra layers of
function call). */
sprintf(p, "\\x%02x", c & 0xff);
p += 4;
}
else
*p++ = c;
}
assert(newsize - (p - PyString_AS_STRING(v)) >= 1);
*p++ = quote;
*p = '\0';
_PyString_Resize(
&v, (int) (p - PyString_AS_STRING(v)));
return v;
}
}
static PyObject *
string_str(PyObject *s)
{
assert(PyString_Check(s));
if (PyString_CheckExact(s)) {
Py_INCREF(s);
return s;
}
else {
/* Subtype -- return genuine string with the same value. */
PyStringObject *t = (PyStringObject *) s;
return PyString_FromStringAndSize(t->ob_sval, t->ob_size);
}
}
static int
string_length(PyStringObject *a)
{
return a->ob_size;
}
static PyObject *
string_concat(register PyStringObject *a, register PyObject *bb)
{
register unsigned int size;
register PyStringObject *op;
if (!PyString_Check(bb)) {
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(bb))
return PyUnicode_Concat((PyObject *)a, bb);
#endif
PyErr_Format(PyExc_TypeError,
"cannot concatenate 'str' and '%.200s' objects",
bb->ob_type->tp_name);
return NULL;
}
#define b ((PyStringObject *)bb)
/* Optimize cases with empty left or right operand */
if ((a->ob_size == 0 || b->ob_size == 0) &&
PyString_CheckExact(a) && PyString_CheckExact(b)) {
if (a->ob_size == 0) {
Py_INCREF(bb);
return bb;
}
Py_INCREF(a);
return (PyObject *)a;
}
size = a->ob_size + b->ob_size;
/* PyObject_NewVar is inlined */
op = (PyStringObject *)
PyObject_MALLOC(sizeof(PyStringObject) + size * sizeof(char));
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
memcpy(op->ob_sval, a->ob_sval, (int) a->ob_size);
memcpy(op->ob_sval + a->ob_size, b->ob_sval, (int) b->ob_size);
op->ob_sval[size] = '\0';
return (PyObject *) op;
#undef b
}
static PyObject *
string_repeat(register PyStringObject *a, register int n)
{
register int i;
register int size;
register PyStringObject *op;
size_t nbytes;
if (n < 0)
n = 0;
/* watch out for overflows: the size can overflow int,
* and the # of bytes needed can overflow size_t
*/
size = a->ob_size * n;
if (n && size / n != a->ob_size) {
PyErr_SetString(PyExc_OverflowError,
"repeated string is too long");
return NULL;
}
if (size == a->ob_size && PyString_CheckExact(a)) {
Py_INCREF(a);
return (PyObject *)a;
}
nbytes = size * sizeof(char);
if (nbytes / sizeof(char) != (size_t)size ||
nbytes + sizeof(PyStringObject) <= nbytes) {
PyErr_SetString(PyExc_OverflowError,
"repeated string is too long");
return NULL;
}
op = (PyStringObject *)
PyObject_MALLOC(sizeof(PyStringObject) + nbytes);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
for (i = 0; i < size; i += a->ob_size)
memcpy(op->ob_sval+i, a->ob_sval, (int) a->ob_size);
op->ob_sval[size] = '\0';
return (PyObject *) op;
}
/* String slice a[i:j] consists of characters a[i] ... a[j-1] */
static PyObject *
string_slice(register PyStringObject *a, register int i, register int j)
/* j -- may be negative! */
{
if (i < 0)
i = 0;
if (j < 0)
j = 0; /* Avoid signed/unsigned bug in next line */
if (j > a->ob_size)
j = a->ob_size;
if (i == 0 && j == a->ob_size && PyString_CheckExact(a)) {
/* It's the same as a */
Py_INCREF(a);
return (PyObject *)a;
}
if (j < i)
j = i;
return PyString_FromStringAndSize(a->ob_sval + i, (int) (j-i));
}
static int
string_contains(PyObject *a, PyObject *el)
{
register char *s, *end;
register char c;
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(el))
return PyUnicode_Contains(a, el);
#endif
if (!PyString_Check(el) || PyString_Size(el) != 1) {
PyErr_SetString(PyExc_TypeError,
"'in <string>' requires character as left operand");
return -1;
}
c = PyString_AsString(el)[0];
s = PyString_AsString(a);
end = s + PyString_Size(a);
while (s < end) {
if (c == *s++)
return 1;
}
return 0;
}
static PyObject *
string_item(PyStringObject *a, register int i)
{
PyObject *v;
char *pchar;
if (i < 0 || i >= a->ob_size) {
PyErr_SetString(PyExc_IndexError, "string index out of range");
return NULL;
}
pchar = a->ob_sval + i;
v = (PyObject *)characters[*pchar & UCHAR_MAX];
if (v == NULL)
v = PyString_FromStringAndSize(pchar, 1);
else {
#ifdef COUNT_ALLOCS
one_strings++;
#endif
Py_INCREF(v);
}
return v;
}
static PyObject*
string_richcompare(PyStringObject *a, PyStringObject *b, int op)
{
int c;
int len_a, len_b;
int min_len;
PyObject *result;
/* Make sure both arguments are strings. */
if (!(PyString_Check(a) && PyString_Check(b))) {
result = Py_NotImplemented;
goto out;
}
if (a == b) {
switch (op) {
case Py_EQ:case Py_LE:case Py_GE:
result = Py_True;
goto out;
case Py_NE:case Py_LT:case Py_GT:
result = Py_False;
goto out;
}
}
if (op == Py_EQ) {
/* Supporting Py_NE here as well does not save
much time, since Py_NE is rarely used. */
if (a->ob_size == b->ob_size
&& (a->ob_sval[0] == b->ob_sval[0]
&& memcmp(a->ob_sval, b->ob_sval,
a->ob_size) == 0)) {
result = Py_True;
} else {
result = Py_False;
}
goto out;
}
len_a = a->ob_size; len_b = b->ob_size;
min_len = (len_a < len_b) ? len_a : len_b;
if (min_len > 0) {
c = Py_CHARMASK(*a->ob_sval) - Py_CHARMASK(*b->ob_sval);
if (c==0)
c = memcmp(a->ob_sval, b->ob_sval, min_len);
}else
c = 0;
if (c == 0)
c = (len_a < len_b) ? -1 : (len_a > len_b) ? 1 : 0;
switch (op) {
case Py_LT: c = c < 0; break;
case Py_LE: c = c <= 0; break;
case Py_EQ: assert(0); break; /* unreachable */
case Py_NE: c = c != 0; break;
case Py_GT: c = c > 0; break;
case Py_GE: c = c >= 0; break;
default:
result = Py_NotImplemented;
goto out;
}
result = c ? Py_True : Py_False;
out:
Py_INCREF(result);
return result;
}
int
_PyString_Eq(PyObject *o1, PyObject *o2)
{
PyStringObject *a, *b;
a = (PyStringObject*)o1;
b = (PyStringObject*)o2;
return a->ob_size == b->ob_size
&& *a->ob_sval == *b->ob_sval
&& memcmp(a->ob_sval, b->ob_sval, a->ob_size) == 0;
}
static long
string_hash(PyStringObject *a)
{
register int len;
register unsigned char *p;
register long x;
#ifdef CACHE_HASH
if (a->ob_shash != -1)
return a->ob_shash;
#ifdef INTERN_STRINGS
if (a->ob_sinterned != NULL)
return (a->ob_shash =
((PyStringObject *)(a->ob_sinterned))->ob_shash);
#endif
#endif
len = a->ob_size;
p = (unsigned char *) a->ob_sval;
x = *p << 7;
while (--len >= 0)
x = (1000003*x) ^ *p++;
x ^= a->ob_size;
if (x == -1)
x = -2;
#ifdef CACHE_HASH
a->ob_shash = x;
#endif
return x;
}
static int
string_buffer_getreadbuf(PyStringObject *self, int index, const void **ptr)
{
if ( index != 0 ) {
PyErr_SetString(PyExc_SystemError,
"accessing non-existent string segment");
return -1;
}
*ptr = (void *)self->ob_sval;
return self->ob_size;
}
static int
string_buffer_getwritebuf(PyStringObject *self, int index, const void **ptr)
{
PyErr_SetString(PyExc_TypeError,
"Cannot use string as modifiable buffer");
return -1;
}
static int
string_buffer_getsegcount(PyStringObject *self, int *lenp)