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stringobject.c
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stringobject.c
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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
/*
Newsizedstringobject() and newstringobject() 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
newstringobject() this is always the case, for
newsizedstringobject() this is the case when the first argument in
not NULL.
A common practice to allocate a string and then fill it in or
change it must be done carefully. It is only allowed to change the
contents of the string if the obect was gotten from
newsizedstringobject() with a NULL first argument, because in the
future these routines may try to do even more sharing of objects.
*/
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) {
nullstring = op;
Py_INCREF(op);
} else if (size == 1 && str != NULL) {
characters[*str & UCHAR_MAX] = op;
Py_INCREF(op);
}
#endif
return (PyObject *) op;
}
PyObject *
PyString_FromString(const char *str)
{
register size_t size = strlen(str);
register PyStringObject *op;
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
strcpy(op->ob_sval, str);
#ifndef DONT_SHARE_SHORT_STRINGS
if (size == 0) {
nullstring = op;
Py_INCREF(op);
} else if (size == 1) {
characters[*str & UCHAR_MAX] = op;
Py_INCREF(op);
}
#endif
return (PyObject *) op;
}
PyObject *PyString_Decode(const char *s,
int size,
const char *encoding,
const char *errors)
{
PyObject *buffer = NULL, *str;
if (encoding == NULL)
encoding = PyUnicode_GetDefaultEncoding();
/* Decode via the codec registry */
buffer = PyBuffer_FromMemory((void *)s, size);
if (buffer == NULL)
goto onError;
str = PyCodec_Decode(buffer, encoding, errors);
if (str == NULL)
goto onError;
/* Convert Unicode to a string using the default encoding */
if (PyUnicode_Check(str)) {
PyObject *temp = str;
str = PyUnicode_AsEncodedString(str, NULL, NULL);
Py_DECREF(temp);
if (str == NULL)
goto onError;
}
if (!PyString_Check(str)) {
PyErr_Format(PyExc_TypeError,
"decoder did not return a string object (type=%.400s)",
str->ob_type->tp_name);
Py_DECREF(str);
goto onError;
}
Py_DECREF(buffer);
return str;
onError:
Py_XDECREF(buffer);
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_AsEncodedString(PyObject *str,
const char *encoding,
const char *errors)
{
PyObject *v;
if (!PyString_Check(str)) {
PyErr_BadArgument();
goto onError;
}
if (encoding == NULL)
encoding = PyUnicode_GetDefaultEncoding();
/* Encode via the codec registry */
v = PyCodec_Encode(str, encoding, errors);
if (v == NULL)
goto onError;
/* 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;
}
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)
{
PyObject_DEL(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;
}
/* Internal API needed by PyString_AsStringAndSize(): */
extern
PyObject *_PyUnicode_AsDefaultEncodedString(PyObject *unicode,
const char *errors);
int
PyString_AsStringAndSize(register PyObject *obj,
register char **s,
register int *len)
{
if (s == NULL) {
PyErr_BadInternalCall();
return -1;
}
if (!PyString_Check(obj)) {
if (PyUnicode_Check(obj)) {
obj = _PyUnicode_AsDefaultEncodedString(obj, NULL);
if (obj == NULL)
return -1;
}
else {
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 (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 = ((PyStringObject *)v)->ob_sval;
*p++ = quote;
for (i = 0; i < op->ob_size; i++) {
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) {
sprintf(p, "\\x%02x", c & 0xff);
p += 4;
}
else
*p++ = c;
}
*p++ = quote;
*p = '\0';
_PyString_Resize(
&v, (int) (p - ((PyStringObject *)v)->ob_sval));
return v;
}
}
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)) {
if (PyUnicode_Check(bb))
return PyUnicode_Concat((PyObject *)a, bb);
PyErr_Format(PyExc_TypeError,
"cannot add type \"%.200s\" to string",
bb->ob_type->tp_name);
return NULL;
}
#define b ((PyStringObject *)bb)
/* Optimize cases with empty left or right operand */
if (a->ob_size == 0) {
Py_INCREF(bb);
return bb;
}
if (b->ob_size == 0) {
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) {
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) { /* 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;
if (PyUnicode_Check(el))
return PyUnicode_Contains(a, el);
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)
{
int c;
PyObject *v;
if (i < 0 || i >= a->ob_size) {
PyErr_SetString(PyExc_IndexError, "string index out of range");
return NULL;
}
c = a->ob_sval[i] & UCHAR_MAX;
v = (PyObject *) characters[c];
#ifdef COUNT_ALLOCS
if (v != NULL)
one_strings++;
#endif
if (v == NULL) {
v = PyString_FromStringAndSize((char *)NULL, 1);
if (v == NULL)
return NULL;
characters[c] = (PyStringObject *) v;
((PyStringObject *)v)->ob_sval[0] = c;
}
Py_INCREF(v);
return v;
}
static int
string_compare(PyStringObject *a, PyStringObject *b)
{
int len_a = a->ob_size, len_b = b->ob_size;
int min_len = (len_a < len_b) ? len_a : len_b;
int cmp;
if (min_len > 0) {
cmp = Py_CHARMASK(*a->ob_sval) - Py_CHARMASK(*b->ob_sval);
if (cmp == 0)
cmp = memcmp(a->ob_sval, b->ob_sval, min_len);
if (cmp != 0)
return cmp;
}
return (len_a < len_b) ? -1 : (len_a > len_b) ? 1 : 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)
{
if ( lenp )
*lenp = self->ob_size;
return 1;
}
static int
string_buffer_getcharbuf(PyStringObject *self, int index, const char **ptr)
{
if ( index != 0 ) {
PyErr_SetString(PyExc_SystemError,
"accessing non-existent string segment");
return -1;
}
*ptr = self->ob_sval;
return self->ob_size;
}
static PySequenceMethods string_as_sequence = {
(inquiry)string_length, /*sq_length*/
(binaryfunc)string_concat, /*sq_concat*/
(intargfunc)string_repeat, /*sq_repeat*/
(intargfunc)string_item, /*sq_item*/
(intintargfunc)string_slice, /*sq_slice*/
0, /*sq_ass_item*/
0, /*sq_ass_slice*/
(objobjproc)string_contains /*sq_contains*/
};
static PyBufferProcs string_as_buffer = {
(getreadbufferproc)string_buffer_getreadbuf,
(getwritebufferproc)string_buffer_getwritebuf,
(getsegcountproc)string_buffer_getsegcount,
(getcharbufferproc)string_buffer_getcharbuf,
};
#define LEFTSTRIP 0
#define RIGHTSTRIP 1
#define BOTHSTRIP 2
static PyObject *
split_whitespace(const char *s, int len, int maxsplit)
{
int i, j, err;
PyObject* item;
PyObject *list = PyList_New(0);
if (list == NULL)
return NULL;
for (i = j = 0; i < len; ) {
while (i < len && isspace(Py_CHARMASK(s[i])))
i++;
j = i;
while (i < len && !isspace(Py_CHARMASK(s[i])))
i++;
if (j < i) {
if (maxsplit-- <= 0)
break;
item = PyString_FromStringAndSize(s+j, (int)(i-j));
if (item == NULL)
goto finally;
err = PyList_Append(list, item);
Py_DECREF(item);
if (err < 0)
goto finally;
while (i < len && isspace(Py_CHARMASK(s[i])))
i++;
j = i;
}
}
if (j < len) {
item = PyString_FromStringAndSize(s+j, (int)(len - j));
if (item == NULL)
goto finally;
err = PyList_Append(list, item);
Py_DECREF(item);
if (err < 0)
goto finally;
}
return list;
finally:
Py_DECREF(list);
return NULL;
}
static char split__doc__[] =
"S.split([sep [,maxsplit]]) -> list of strings\n\
\n\
Return a list of the words in the string S, using sep as the\n\
delimiter string. If maxsplit is given, at most maxsplit\n\
splits are done. If sep is not specified, any whitespace string\n\
is a separator.";
static PyObject *
string_split(PyStringObject *self, PyObject *args)
{
int len = PyString_GET_SIZE(self), n, i, j, err;
int maxsplit = -1;
const char *s = PyString_AS_STRING(self), *sub;
PyObject *list, *item, *subobj = Py_None;
if (!PyArg_ParseTuple(args, "|Oi:split", &subobj, &maxsplit))
return NULL;
if (maxsplit < 0)
maxsplit = INT_MAX;
if (subobj == Py_None)
return split_whitespace(s, len, maxsplit);
if (PyString_Check(subobj)) {
sub = PyString_AS_STRING(subobj);
n = PyString_GET_SIZE(subobj);
}
else if (PyUnicode_Check(subobj))
return PyUnicode_Split((PyObject *)self, subobj, maxsplit);
else if (PyObject_AsCharBuffer(subobj, &sub, &n))
return NULL;
if (n == 0) {
PyErr_SetString(PyExc_ValueError, "empty separator");
return NULL;
}
list = PyList_New(0);
if (list == NULL)
return NULL;
i = j = 0;
while (i+n <= len) {
if (s[i] == sub[0] && memcmp(s+i, sub, n) == 0) {
if (maxsplit-- <= 0)
break;
item = PyString_FromStringAndSize(s+j, (int)(i-j));
if (item == NULL)
goto fail;
err = PyList_Append(list, item);
Py_DECREF(item);
if (err < 0)
goto fail;
i = j = i + n;
}
else
i++;
}
item = PyString_FromStringAndSize(s+j, (int)(len-j));
if (item == NULL)
goto fail;
err = PyList_Append(list, item);
Py_DECREF(item);
if (err < 0)
goto fail;
return list;
fail:
Py_DECREF(list);
return NULL;
}
static char join__doc__[] =
"S.join(sequence) -> string\n\
\n\
Return a string which is the concatenation of the strings in the\n\
sequence. The separator between elements is S.";
static PyObject *
string_join(PyStringObject *self, PyObject *args)
{
char *sep = PyString_AS_STRING(self);
const int seplen = PyString_GET_SIZE(self);
PyObject *res = NULL;
char *p;
int seqlen = 0;
size_t sz = 0;
int i;
PyObject *orig, *seq, *item;
if (!PyArg_ParseTuple(args, "O:join", &orig))
return NULL;
seq = PySequence_Fast(orig, "");
if (seq == NULL) {
if (PyErr_ExceptionMatches(PyExc_TypeError))
PyErr_Format(PyExc_TypeError,
"sequence expected, %.80s found",
orig->ob_type->tp_name);
return NULL;
}
seqlen = PySequence_Size(seq);
if (seqlen == 0) {
Py_DECREF(seq);
return PyString_FromString("");
}
if (seqlen == 1) {
item = PySequence_Fast_GET_ITEM(seq, 0);
if (!PyString_Check(item) && !PyUnicode_Check(item)) {
PyErr_Format(PyExc_TypeError,
"sequence item 0: expected string,"
" %.80s found",
item->ob_type->tp_name);
Py_DECREF(seq);
return NULL;
}
Py_INCREF(item);
Py_DECREF(seq);
return item;
}
/* There are at least two things to join. Do a pre-pass to figure out
* the total amount of space we'll need (sz), see whether any argument
* is absurd, and defer to the Unicode join if appropriate.
*/
for (i = 0; i < seqlen; i++) {
const size_t old_sz = sz;
item = PySequence_Fast_GET_ITEM(seq, i);
if (!PyString_Check(item)){
if (PyUnicode_Check(item)) {
Py_DECREF(seq);
return PyUnicode_Join((PyObject *)self, orig);
}
PyErr_Format(PyExc_TypeError,
"sequence item %i: expected string,"
" %.80s found",
i, item->ob_type->tp_name);
Py_DECREF(seq);
return NULL;
}
sz += PyString_GET_SIZE(item);
if (i != 0)
sz += seplen;
if (sz < old_sz || sz > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"join() is too long for a Python string");
Py_DECREF(seq);
return NULL;
}
}
/* Allocate result space. */
res = PyString_FromStringAndSize((char*)NULL, (int)sz);
if (res == NULL) {
Py_DECREF(seq);
return NULL;
}
/* Catenate everything. */
p = PyString_AS_STRING(res);
for (i = 0; i < seqlen; ++i) {
size_t n;
item = PySequence_Fast_GET_ITEM(seq, i);
n = PyString_GET_SIZE(item);
memcpy(p, PyString_AS_STRING(item), n);
p += n;
if (i < seqlen - 1) {
memcpy(p, sep, seplen);
p += seplen;
}
}
Py_DECREF(seq);
return res;
}
static long
string_find_internal(PyStringObject *self, PyObject *args, int dir)
{
const char *s = PyString_AS_STRING(self), *sub;
int len = PyString_GET_SIZE(self);
int n, i = 0, last = INT_MAX;
PyObject *subobj;
if (!PyArg_ParseTuple(args, "O|O&O&:find/rfind/index/rindex",
&subobj, _PyEval_SliceIndex, &i, _PyEval_SliceIndex, &last))
return -2;
if (PyString_Check(subobj)) {
sub = PyString_AS_STRING(subobj);
n = PyString_GET_SIZE(subobj);
}
else if (PyUnicode_Check(subobj))
return PyUnicode_Find((PyObject *)self, subobj, i, last, 1);
else if (PyObject_AsCharBuffer(subobj, &sub, &n))
return -2;
if (last > len)
last = len;
if (last < 0)
last += len;
if (last < 0)
last = 0;
if (i < 0)
i += len;
if (i < 0)
i = 0;
if (dir > 0) {
if (n == 0 && i <= last)
return (long)i;
last -= n;
for (; i <= last; ++i)
if (s[i] == sub[0] && memcmp(&s[i], sub, n) == 0)
return (long)i;
}
else {
int j;
if (n == 0 && i <= last)
return (long)last;
for (j = last-n; j >= i; --j)
if (s[j] == sub[0] && memcmp(&s[j], sub, n) == 0)
return (long)j;
}
return -1;
}
static char find__doc__[] =
"S.find(sub [,start [,end]]) -> int\n\
\n\
Return the lowest index in S where substring sub is found,\n\
such that sub is contained within s[start,end]. Optional\n\
arguments start and end are interpreted as in slice notation.\n\
\n\
Return -1 on failure.";
static PyObject *
string_find(PyStringObject *self, PyObject *args)
{
long result = string_find_internal(self, args, +1);
if (result == -2)
return NULL;
return PyInt_FromLong(result);
}
static char index__doc__[] =
"S.index(sub [,start [,end]]) -> int\n\
\n\
Like S.find() but raise ValueError when the substring is not found.";
static PyObject *
string_index(PyStringObject *self, PyObject *args)
{
long result = string_find_internal(self, args, +1);
if (result == -2)
return NULL;
if (result == -1) {
PyErr_SetString(PyExc_ValueError,
"substring not found in string.index");
return NULL;
}
return PyInt_FromLong(result);
}
static char rfind__doc__[] =
"S.rfind(sub [,start [,end]]) -> int\n\
\n\
Return the highest index in S where substring sub is found,\n\
such that sub is contained within s[start,end]. Optional\n\
arguments start and end are interpreted as in slice notation.\n\