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bytesobject.c
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3466 lines (3091 loc) · 83.7 KB
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/* bytes object implementation */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "bytes_methods.h"
#include <stddef.h>
static Py_ssize_t
_getbuffer(PyObject *obj, Py_buffer *view)
{
PyBufferProcs *buffer = Py_TYPE(obj)->tp_as_buffer;
if (buffer == NULL || buffer->bf_getbuffer == NULL)
{
PyErr_Format(PyExc_TypeError,
"Type %.100s doesn't support the buffer API",
Py_TYPE(obj)->tp_name);
return -1;
}
if (buffer->bf_getbuffer(obj, view, PyBUF_SIMPLE) < 0)
return -1;
return view->len;
}
#ifdef COUNT_ALLOCS
Py_ssize_t null_strings, one_strings;
#endif
static PyBytesObject *characters[UCHAR_MAX + 1];
static PyBytesObject *nullstring;
/* PyBytesObject_SIZE gives the basic size of a string; any memory allocation
for a string of length n should request PyBytesObject_SIZE + n bytes.
Using PyBytesObject_SIZE instead of sizeof(PyBytesObject) saves
3 bytes per string allocation on a typical system.
*/
#define PyBytesObject_SIZE (offsetof(PyBytesObject, ob_sval) + 1)
/*
For both PyBytes_FromString() and PyBytes_FromStringAndSize(), the
parameter `size' denotes number of characters to allocate, not counting any
null terminating character.
For PyBytes_FromString(), the parameter `str' points to a null-terminated
string containing exactly `size' bytes.
For PyBytes_FromStringAndSize(), the parameter the parameter `str' is
either NULL or else points to a string containing at least `size' bytes.
For PyBytes_FromStringAndSize(), the string in the `str' parameter does
not have to be null-terminated. (Therefore it is safe to construct a
substring by calling `PyBytes_FromStringAndSize(origstring, substrlen)'.)
If `str' is NULL then PyBytes_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
PyBytes_FromStringAndSize()) or the length of the string in the `str'
parameter (for PyBytes_FromString()).
*/
PyObject *
PyBytes_FromStringAndSize(const char *str, Py_ssize_t size)
{
register PyBytesObject *op;
if (size < 0) {
PyErr_SetString(PyExc_SystemError,
"Negative size passed to PyBytes_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 > PY_SSIZE_T_MAX - PyBytesObject_SIZE) {
PyErr_SetString(PyExc_OverflowError,
"byte string is too large");
return NULL;
}
/* Inline PyObject_NewVar */
op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + size);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyBytes_Type, size);
op->ob_shash = -1;
if (str != NULL)
Py_MEMCPY(op->ob_sval, str, size);
op->ob_sval[size] = '\0';
/* 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);
}
return (PyObject *) op;
}
PyObject *
PyBytes_FromString(const char *str)
{
register size_t size;
register PyBytesObject *op;
assert(str != NULL);
size = strlen(str);
if (size > PY_SSIZE_T_MAX - PyBytesObject_SIZE) {
PyErr_SetString(PyExc_OverflowError,
"byte string is too long");
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 = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + size);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyBytes_Type, size);
op->ob_shash = -1;
Py_MEMCPY(op->ob_sval, str, size+1);
/* share short strings */
if (size == 0) {
nullstring = op;
Py_INCREF(op);
} else if (size == 1) {
characters[*str & UCHAR_MAX] = op;
Py_INCREF(op);
}
return (PyObject *) op;
}
PyObject *
PyBytes_FromFormatV(const char *format, va_list vargs)
{
va_list count;
Py_ssize_t n = 0;
const char* f;
char *s;
PyObject* string;
#ifdef VA_LIST_IS_ARRAY
Py_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(*f))
;
/* skip the 'l' or 'z' in {%ld, %zd, %lu, %zu} since
* they don't affect the amount of space we reserve.
*/
if ((*f == 'l' || *f == 'z') &&
(f[1] == 'd' || f[1] == 'u'))
++f;
switch (*f) {
case 'c':
(void)va_arg(count, int);
/* fall through... */
case '%':
n++;
break;
case 'd': case 'u': 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 = PyBytes_FromStringAndSize(NULL, n);
if (!string)
return NULL;
s = PyBytes_AsString(string);
for (f = format; *f; f++) {
if (*f == '%') {
const char* p = f++;
Py_ssize_t i;
int longflag = 0;
int size_tflag = 0;
/* parse the width.precision part (we're only
interested in the precision value, if any) */
n = 0;
while (ISDIGIT(*f))
n = (n*10) + *f++ - '0';
if (*f == '.') {
f++;
n = 0;
while (ISDIGIT(*f))
n = (n*10) + *f++ - '0';
}
while (*f && *f != '%' && !ISALPHA(*f))
f++;
/* handle the long flag, but only for %ld and %lu.
others can be added when necessary. */
if (*f == 'l' && (f[1] == 'd' || f[1] == 'u')) {
longflag = 1;
++f;
}
/* handle the size_t flag. */
if (*f == 'z' && (f[1] == 'd' || f[1] == 'u')) {
size_tflag = 1;
++f;
}
switch (*f) {
case 'c':
*s++ = va_arg(vargs, int);
break;
case 'd':
if (longflag)
sprintf(s, "%ld", va_arg(vargs, long));
else if (size_tflag)
sprintf(s, "%" PY_FORMAT_SIZE_T "d",
va_arg(vargs, Py_ssize_t));
else
sprintf(s, "%d", va_arg(vargs, int));
s += strlen(s);
break;
case 'u':
if (longflag)
sprintf(s, "%lu",
va_arg(vargs, unsigned long));
else if (size_tflag)
sprintf(s, "%" PY_FORMAT_SIZE_T "u",
va_arg(vargs, size_t));
else
sprintf(s, "%u",
va_arg(vargs, unsigned 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;
Py_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:
_PyBytes_Resize(&string, s - PyBytes_AS_STRING(string));
return string;
}
PyObject *
PyBytes_FromFormat(const char *format, ...)
{
PyObject* ret;
va_list vargs;
#ifdef HAVE_STDARG_PROTOTYPES
va_start(vargs, format);
#else
va_start(vargs);
#endif
ret = PyBytes_FromFormatV(format, vargs);
va_end(vargs);
return ret;
}
static void
string_dealloc(PyObject *op)
{
Py_TYPE(op)->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 *PyBytes_DecodeEscape(const char *s,
Py_ssize_t len,
const char *errors,
Py_ssize_t unicode,
const char *recode_encoding)
{
int c;
char *p, *buf;
const char *end;
PyObject *v;
Py_ssize_t newlen = recode_encoding ? 4*len:len;
v = PyBytes_FromStringAndSize((char *)NULL, newlen);
if (v == NULL)
return NULL;
p = buf = PyBytes_AsString(v);
end = s + len;
while (s < end) {
if (*s != '\\') {
non_esc:
if (recode_encoding && (*s & 0x80)) {
PyObject *u, *w;
char *r;
const char* t;
Py_ssize_t 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. */
assert(PyBytes_Check(w));
r = PyBytes_AS_STRING(w);
rn = PyBytes_GET_SIZE(w);
Py_MEMCPY(p, r, rn);
p += rn;
Py_DECREF(w);
s = t;
} else {
*p++ = *s++;
}
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 (s < end && '0' <= *s && *s <= '7') {
c = (c<<3) + *s++ - '0';
if (s < end && '0' <= *s && *s <= '7')
c = (c<<3) + *s++ - '0';
}
*p++ = c;
break;
case 'x':
if (s+1 < end && ISXDIGIT(s[0]) && ISXDIGIT(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;
}
default:
*p++ = '\\';
s--;
goto non_esc; /* an arbitry number of unescaped
UTF-8 bytes may follow. */
}
}
if (p-buf < newlen)
_PyBytes_Resize(&v, p - buf);
return v;
failed:
Py_DECREF(v);
return NULL;
}
/* -------------------------------------------------------------------- */
/* object api */
Py_ssize_t
PyBytes_Size(register PyObject *op)
{
if (!PyBytes_Check(op)) {
PyErr_Format(PyExc_TypeError,
"expected bytes, %.200s found", Py_TYPE(op)->tp_name);
return -1;
}
return Py_SIZE(op);
}
char *
PyBytes_AsString(register PyObject *op)
{
if (!PyBytes_Check(op)) {
PyErr_Format(PyExc_TypeError,
"expected bytes, %.200s found", Py_TYPE(op)->tp_name);
return NULL;
}
return ((PyBytesObject *)op)->ob_sval;
}
int
PyBytes_AsStringAndSize(register PyObject *obj,
register char **s,
register Py_ssize_t *len)
{
if (s == NULL) {
PyErr_BadInternalCall();
return -1;
}
if (!PyBytes_Check(obj)) {
PyErr_Format(PyExc_TypeError,
"expected bytes, %.200s found", Py_TYPE(obj)->tp_name);
return -1;
}
*s = PyBytes_AS_STRING(obj);
if (len != NULL)
*len = PyBytes_GET_SIZE(obj);
else if (strlen(*s) != (size_t)PyBytes_GET_SIZE(obj)) {
PyErr_SetString(PyExc_TypeError,
"expected bytes with no null");
return -1;
}
return 0;
}
/* -------------------------------------------------------------------- */
/* Methods */
#define STRINGLIB_CHAR char
#define STRINGLIB_CMP memcmp
#define STRINGLIB_LEN PyBytes_GET_SIZE
#define STRINGLIB_NEW PyBytes_FromStringAndSize
#define STRINGLIB_STR PyBytes_AS_STRING
/* #define STRINGLIB_WANT_CONTAINS_OBJ 1 */
#define STRINGLIB_EMPTY nullstring
#define STRINGLIB_CHECK_EXACT PyBytes_CheckExact
#define STRINGLIB_MUTABLE 0
#include "stringlib/fastsearch.h"
#include "stringlib/count.h"
#include "stringlib/find.h"
#include "stringlib/partition.h"
#include "stringlib/ctype.h"
#include "stringlib/transmogrify.h"
#define _Py_InsertThousandsGrouping _PyBytes_InsertThousandsGrouping
#include "stringlib/localeutil.h"
PyObject *
PyBytes_Repr(PyObject *obj, int smartquotes)
{
static const char *hexdigits = "0123456789abcdef";
register PyBytesObject* op = (PyBytesObject*) obj;
Py_ssize_t length = Py_SIZE(op);
size_t newsize = 3 + 4 * length;
PyObject *v;
if (newsize > PY_SSIZE_T_MAX || (newsize-3) / 4 != length) {
PyErr_SetString(PyExc_OverflowError,
"bytes object is too large to make repr");
return NULL;
}
v = PyUnicode_FromUnicode(NULL, newsize);
if (v == NULL) {
return NULL;
}
else {
register Py_ssize_t i;
register Py_UNICODE c;
register Py_UNICODE *p = PyUnicode_AS_UNICODE(v);
int quote;
/* Figure out which quote to use; single is preferred */
quote = '\'';
if (smartquotes) {
char *test, *start;
start = PyBytes_AS_STRING(op);
for (test = start; test < start+length; ++test) {
if (*test == '"') {
quote = '\''; /* back to single */
goto decided;
}
else if (*test == '\'')
quote = '"';
}
decided:
;
}
*p++ = 'b', *p++ = quote;
for (i = 0; i < length; i++) {
/* There's at least enough room for a hex escape
and a closing quote. */
assert(newsize - (p - PyUnicode_AS_UNICODE(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) {
*p++ = '\\';
*p++ = 'x';
*p++ = hexdigits[(c & 0xf0) >> 4];
*p++ = hexdigits[c & 0xf];
}
else
*p++ = c;
}
assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 1);
*p++ = quote;
*p = '\0';
if (PyUnicode_Resize(&v, (p - PyUnicode_AS_UNICODE(v)))) {
Py_DECREF(v);
return NULL;
}
return v;
}
}
static PyObject *
string_repr(PyObject *op)
{
return PyBytes_Repr(op, 1);
}
static PyObject *
string_str(PyObject *op)
{
if (Py_BytesWarningFlag) {
if (PyErr_WarnEx(PyExc_BytesWarning,
"str() on a bytes instance", 1))
return NULL;
}
return string_repr(op);
}
static Py_ssize_t
string_length(PyBytesObject *a)
{
return Py_SIZE(a);
}
/* This is also used by PyBytes_Concat() */
static PyObject *
string_concat(PyObject *a, PyObject *b)
{
Py_ssize_t size;
Py_buffer va, vb;
PyObject *result = NULL;
va.len = -1;
vb.len = -1;
if (_getbuffer(a, &va) < 0 ||
_getbuffer(b, &vb) < 0) {
PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
goto done;
}
/* Optimize end cases */
if (va.len == 0 && PyBytes_CheckExact(b)) {
result = b;
Py_INCREF(result);
goto done;
}
if (vb.len == 0 && PyBytes_CheckExact(a)) {
result = a;
Py_INCREF(result);
goto done;
}
size = va.len + vb.len;
if (size < 0) {
PyErr_NoMemory();
goto done;
}
result = PyBytes_FromStringAndSize(NULL, size);
if (result != NULL) {
memcpy(PyBytes_AS_STRING(result), va.buf, va.len);
memcpy(PyBytes_AS_STRING(result) + va.len, vb.buf, vb.len);
}
done:
if (va.len != -1)
PyBuffer_Release(&va);
if (vb.len != -1)
PyBuffer_Release(&vb);
return result;
}
static PyObject *
string_repeat(register PyBytesObject *a, register Py_ssize_t n)
{
register Py_ssize_t i;
register Py_ssize_t j;
register Py_ssize_t size;
register PyBytesObject *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 = Py_SIZE(a) * n;
if (n && size / n != Py_SIZE(a)) {
PyErr_SetString(PyExc_OverflowError,
"repeated bytes are too long");
return NULL;
}
if (size == Py_SIZE(a) && PyBytes_CheckExact(a)) {
Py_INCREF(a);
return (PyObject *)a;
}
nbytes = (size_t)size;
if (nbytes + PyBytesObject_SIZE <= nbytes) {
PyErr_SetString(PyExc_OverflowError,
"repeated bytes are too long");
return NULL;
}
op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + nbytes);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyBytes_Type, size);
op->ob_shash = -1;
op->ob_sval[size] = '\0';
if (Py_SIZE(a) == 1 && n > 0) {
memset(op->ob_sval, a->ob_sval[0] , n);
return (PyObject *) op;
}
i = 0;
if (i < size) {
Py_MEMCPY(op->ob_sval, a->ob_sval, Py_SIZE(a));
i = Py_SIZE(a);
}
while (i < size) {
j = (i <= size-i) ? i : size-i;
Py_MEMCPY(op->ob_sval+i, op->ob_sval, j);
i += j;
}
return (PyObject *) op;
}
static int
string_contains(PyObject *self, PyObject *arg)
{
Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
if (ival == -1 && PyErr_Occurred()) {
Py_buffer varg;
int pos;
PyErr_Clear();
if (_getbuffer(arg, &varg) < 0)
return -1;
pos = stringlib_find(PyBytes_AS_STRING(self), Py_SIZE(self),
varg.buf, varg.len, 0);
PyBuffer_Release(&varg);
return pos >= 0;
}
if (ival < 0 || ival >= 256) {
PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
return -1;
}
return memchr(PyBytes_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
}
static PyObject *
string_item(PyBytesObject *a, register Py_ssize_t i)
{
if (i < 0 || i >= Py_SIZE(a)) {
PyErr_SetString(PyExc_IndexError, "index out of range");
return NULL;
}
return PyLong_FromLong((unsigned char)a->ob_sval[i]);
}
static PyObject*
string_richcompare(PyBytesObject *a, PyBytesObject *b, int op)
{
int c;
Py_ssize_t len_a, len_b;
Py_ssize_t min_len;
PyObject *result;
/* Make sure both arguments are strings. */
if (!(PyBytes_Check(a) && PyBytes_Check(b))) {
if (Py_BytesWarningFlag && (op == Py_EQ || op == Py_NE) &&
(PyObject_IsInstance((PyObject*)a,
(PyObject*)&PyUnicode_Type) ||
PyObject_IsInstance((PyObject*)b,
(PyObject*)&PyUnicode_Type))) {
if (PyErr_WarnEx(PyExc_BytesWarning,
"Comparison between bytes and string", 1))
return NULL;
}
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 (Py_SIZE(a) == Py_SIZE(b)
&& (a->ob_sval[0] == b->ob_sval[0]
&& memcmp(a->ob_sval, b->ob_sval, Py_SIZE(a)) == 0)) {
result = Py_True;
} else {
result = Py_False;
}
goto out;
}
len_a = Py_SIZE(a); len_b = Py_SIZE(b);
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;
}
static long
string_hash(PyBytesObject *a)
{
register Py_ssize_t len;
register unsigned char *p;
register long x;
if (a->ob_shash != -1)
return a->ob_shash;
len = Py_SIZE(a);
p = (unsigned char *) a->ob_sval;
x = *p << 7;
while (--len >= 0)
x = (1000003*x) ^ *p++;
x ^= Py_SIZE(a);
if (x == -1)
x = -2;
a->ob_shash = x;
return x;
}
static PyObject*
string_subscript(PyBytesObject* self, PyObject* item)
{
if (PyIndex_Check(item)) {
Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)
i += PyBytes_GET_SIZE(self);
if (i < 0 || i >= PyBytes_GET_SIZE(self)) {
PyErr_SetString(PyExc_IndexError,
"index out of range");
return NULL;
}
return PyLong_FromLong((unsigned char)self->ob_sval[i]);
}
else if (PySlice_Check(item)) {
Py_ssize_t start, stop, step, slicelength, cur, i;
char* source_buf;
char* result_buf;
PyObject* result;
if (PySlice_GetIndicesEx((PySliceObject*)item,
PyBytes_GET_SIZE(self),
&start, &stop, &step, &slicelength) < 0) {
return NULL;
}
if (slicelength <= 0) {
return PyBytes_FromStringAndSize("", 0);
}
else if (start == 0 && step == 1 &&
slicelength == PyBytes_GET_SIZE(self) &&
PyBytes_CheckExact(self)) {
Py_INCREF(self);
return (PyObject *)self;
}
else if (step == 1) {
return PyBytes_FromStringAndSize(
PyBytes_AS_STRING(self) + start,
slicelength);
}
else {
source_buf = PyBytes_AsString((PyObject*)self);
result_buf = (char *)PyMem_Malloc(slicelength);
if (result_buf == NULL)
return PyErr_NoMemory();
for (cur = start, i = 0; i < slicelength;
cur += step, i++) {
result_buf[i] = source_buf[cur];
}
result = PyBytes_FromStringAndSize(result_buf,
slicelength);
PyMem_Free(result_buf);
return result;
}
}
else {
PyErr_Format(PyExc_TypeError,
"byte indices must be integers, not %.200s",
Py_TYPE(item)->tp_name);
return NULL;
}
}
static int
string_buffer_getbuffer(PyBytesObject *self, Py_buffer *view, int flags)
{
return PyBuffer_FillInfo(view, (PyObject*)self, (void *)self->ob_sval, Py_SIZE(self),
1, flags);
}
static PySequenceMethods string_as_sequence = {
(lenfunc)string_length, /*sq_length*/
(binaryfunc)string_concat, /*sq_concat*/
(ssizeargfunc)string_repeat, /*sq_repeat*/
(ssizeargfunc)string_item, /*sq_item*/
0, /*sq_slice*/
0, /*sq_ass_item*/
0, /*sq_ass_slice*/
(objobjproc)string_contains /*sq_contains*/
};
static PyMappingMethods string_as_mapping = {
(lenfunc)string_length,
(binaryfunc)string_subscript,
0,
};