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4469 lines (4022 loc) · 105 KB
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Copy pathstringobject.c
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4469 lines (4022 loc) · 105 KB
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/* String object implementation */
#include "Python.h"
#include <ctype.h>
#ifdef COUNT_ALLOCS
int null_strings, one_strings;
#endif
static PyStringObject *characters[UCHAR_MAX + 1];
static PyStringObject *nullstring;
/* This dictionary holds all interned strings. Note that references to
strings in this dictionary are *not* counted in the string's ob_refcnt.
When the interned string reaches a refcnt of 0 the string deallocation
function will delete the reference from this dictionary.
Another way to look at this is that to say that the actual reference
count of a string is: s->ob_refcnt + (s->ob_sstate?2:0)
*/
static PyObject *interned;
/*
For both PyString_FromString() and PyString_FromStringAndSize(), the
parameter `size' denotes number of characters to allocate, not counting any
null terminating character.
For PyString_FromString(), the parameter `str' points to a null-terminated
string containing exactly `size' bytes.
For PyString_FromStringAndSize(), the parameter the parameter `str' is
either NULL or else points to a string containing at least `size' bytes.
For PyString_FromStringAndSize(), the string in the `str' parameter does
not have to be null-terminated. (Therefore it is safe to construct a
substring by calling `PyString_FromStringAndSize(origstring, substrlen)'.)
If `str' is NULL then PyString_FromStringAndSize() will allocate `size+1'
bytes (setting the last byte to the null terminating character) and you can
fill in the data yourself. If `str' is non-NULL then the resulting
PyString object must be treated as immutable and you must not fill in nor
alter the data yourself, since the strings may be shared.
The PyObject member `op->ob_size', which denotes the number of "extra
items" in a variable-size object, will contain the number of bytes
allocated for string data, not counting the null terminating character. It
is therefore equal to the equal to the `size' parameter (for
PyString_FromStringAndSize()) or the length of the string in the `str'
parameter (for PyString_FromString()).
*/
PyObject *
PyString_FromStringAndSize(const char *str, int size)
{
register PyStringObject *op;
if (size < 0) {
PyErr_SetString(PyExc_SystemError,
"Negative size passed to PyString_FromStringAndSize");
return NULL;
}
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;
}
if (size > INT_MAX - sizeof(PyStringObject)) {
PyErr_SetString(PyExc_OverflowError, "string is too large");
return NULL;
}
/* Inline PyObject_NewVar */
op = (PyStringObject *)PyObject_MALLOC(sizeof(PyStringObject) + size);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
op->ob_shash = -1;
op->ob_sstate = SSTATE_NOT_INTERNED;
if (str != NULL)
memcpy(op->ob_sval, str, size);
op->ob_sval[size] = '\0';
/* 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);
}
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 - sizeof(PyStringObject)) {
PyErr_SetString(PyExc_OverflowError,
"string is too long for a Python string");
return NULL;
}
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;
}
/* Inline PyObject_NewVar */
op = (PyStringObject *)PyObject_MALLOC(sizeof(PyStringObject) + size);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
op->ob_shash = -1;
op->ob_sstate = SSTATE_NOT_INTERNED;
memcpy(op->ob_sval, str, size+1);
/* 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);
}
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)
{
switch (PyString_CHECK_INTERNED(op)) {
case SSTATE_NOT_INTERNED:
break;
case SSTATE_INTERNED_MORTAL:
/* revive dead object temporarily for DelItem */
op->ob_refcnt = 3;
if (PyDict_DelItem(interned, op) != 0)
Py_FatalError(
"deletion of interned string failed");
break;
case SSTATE_INTERNED_IMMORTAL:
Py_FatalError("Immortal interned string died.");
default:
Py_FatalError("Inconsistent interned string state.");
}
op->ob_type->tp_free(op);
}
/* Unescape a backslash-escaped string. If unicode is non-zero,
the string is a u-literal. If recode_encoding is non-zero,
the string is UTF-8 encoded and should be re-encoded in the
specified encoding. */
PyObject *PyString_DecodeEscape(const char *s,
int len,
const char *errors,
int unicode,
const char *recode_encoding)
{
int c;
char *p, *buf;
const char *end;
PyObject *v;
int newlen = recode_encoding ? 4*len:len;
v = PyString_FromStringAndSize((char *)NULL, newlen);
if (v == NULL)
return NULL;
p = buf = PyString_AsString(v);
end = s + len;
while (s < end) {
if (*s != '\\') {
non_esc:
#ifdef Py_USING_UNICODE
if (recode_encoding && (*s & 0x80)) {
PyObject *u, *w;
char *r;
const char* t;
int rn;
t = s;
/* Decode non-ASCII bytes as UTF-8. */
while (t < end && (*t & 0x80)) t++;
u = PyUnicode_DecodeUTF8(s, t - s, errors);
if(!u) goto failed;
/* Recode them in target encoding. */
w = PyUnicode_AsEncodedString(
u, recode_encoding, errors);
Py_DECREF(u);
if (!w) goto failed;
/* Append bytes to output buffer. */
r = PyString_AsString(w);
rn = PyString_Size(w);
memcpy(p, r, rn);
p += rn;
Py_DECREF(w);
s = t;
} else {
*p++ = *s++;
}
#else
*p++ = *s++;
#endif
continue;
}
s++;
if (s==end) {
PyErr_SetString(PyExc_ValueError,
"Trailing \\ in string");
goto failed;
}
switch (*s++) {
/* XXX This assumes ASCII! */
case '\n': break;
case '\\': *p++ = '\\'; break;
case '\'': *p++ = '\''; break;
case '\"': *p++ = '\"'; break;
case 'b': *p++ = '\b'; break;
case 'f': *p++ = '\014'; break; /* FF */
case 't': *p++ = '\t'; break;
case 'n': *p++ = '\n'; break;
case 'r': *p++ = '\r'; break;
case 'v': *p++ = '\013'; break; /* VT */
case 'a': *p++ = '\007'; break; /* BEL, not classic C */
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c = s[-1] - '0';
if ('0' <= *s && *s <= '7') {
c = (c<<3) + *s++ - '0';
if ('0' <= *s && *s <= '7')
c = (c<<3) + *s++ - '0';
}
*p++ = c;
break;
case 'x':
if (isxdigit(Py_CHARMASK(s[0]))
&& isxdigit(Py_CHARMASK(s[1]))) {
unsigned int x = 0;
c = Py_CHARMASK(*s);
s++;
if (isdigit(c))
x = c - '0';
else if (islower(c))
x = 10 + c - 'a';
else
x = 10 + c - 'A';
x = x << 4;
c = Py_CHARMASK(*s);
s++;
if (isdigit(c))
x += c - '0';
else if (islower(c))
x += 10 + c - 'a';
else
x += 10 + c - 'A';
*p++ = x;
break;
}
if (!errors || strcmp(errors, "strict") == 0) {
PyErr_SetString(PyExc_ValueError,
"invalid \\x escape");
goto failed;
}
if (strcmp(errors, "replace") == 0) {
*p++ = '?';
} else if (strcmp(errors, "ignore") == 0)
/* do nothing */;
else {
PyErr_Format(PyExc_ValueError,
"decoding error; "
"unknown error handling code: %.400s",
errors);
goto failed;
}
#ifndef Py_USING_UNICODE
case 'u':
case 'U':
case 'N':
if (unicode) {
PyErr_SetString(PyExc_ValueError,
"Unicode escapes not legal "
"when Unicode disabled");
goto failed;
}
#endif
default:
*p++ = '\\';
s--;
goto non_esc; /* an arbitry number of unescaped
UTF-8 bytes may follow. */
}
}
if (p-buf < newlen)
_PyString_Resize(&v, (int)(p - buf));
return v;
failed:
Py_DECREF(v);
return NULL;
}
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) {
#ifdef __VMS
if (op->ob_size) fwrite(op->ob_sval, (int) op->ob_size, 1, fp);
#else
fwrite(op->ob_sval, 1, (int) op->ob_size, fp);
#endif
return 0;
}
/* figure out which quote to use; single is preferred */
quote = '\'';
if (memchr(op->ob_sval, '\'', op->ob_size) &&
!memchr(op->ob_sval, '"', op->ob_size))
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;
}
PyObject *
PyString_Repr(PyObject *obj, int smartquotes)
{
register PyStringObject* op = (PyStringObject*) obj;
size_t newsize = 2 + 4 * op->ob_size;
PyObject *v;
if (newsize > INT_MAX || newsize / 4 != op->ob_size) {
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 (smartquotes &&
memchr(op->ob_sval, '\'', op->ob_size) &&
!memchr(op->ob_sval, '"', op->ob_size))
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_repr(PyObject *op)
{
return PyString_Repr(op, 1);
}
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;
}
/* Check that string sizes are not negative, to prevent an
overflow in cases where we are passed incorrectly-created
strings with negative lengths (due to a bug in other code).
*/
size = a->ob_size + b->ob_size;
if (a->ob_size < 0 || b->ob_size < 0 ||
a->ob_size > INT_MAX - b->ob_size) {
PyErr_SetString(PyExc_OverflowError,
"strings are too large to concat");
return NULL;
}
/* Inline PyObject_NewVar */
op = (PyStringObject *)PyObject_MALLOC(sizeof(PyStringObject) + size);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
op->ob_shash = -1;
op->ob_sstate = SSTATE_NOT_INTERNED;
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 j;
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_t)size;
if (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);
op->ob_shash = -1;
op->ob_sstate = SSTATE_NOT_INTERNED;
op->ob_sval[size] = '\0';
if (a->ob_size == 1 && n > 0) {
memset(op->ob_sval, a->ob_sval[0] , n);
return (PyObject *) op;
}
i = 0;
if (i < size) {
memcpy(op->ob_sval, a->ob_sval, (int) a->ob_size);
i = (int) a->ob_size;
}
while (i < size) {
j = (i <= size-i) ? i : size-i;
memcpy(op->ob_sval+i, op->ob_sval, j);
i += j;
}
return (PyObject *) op;
}