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stringobject.c
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4845 lines (4347 loc) · 142 KB
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/* String (str/bytes) object implementation */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include <ctype.h>
#include <stddef.h>
#ifdef COUNT_ALLOCS
Py_ssize_t 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;
/* PyStringObject_SIZE gives the basic size of a string; any memory allocation
for a string of length n should request PyStringObject_SIZE + n bytes.
Using PyStringObject_SIZE instead of sizeof(PyStringObject) saves
3 bytes per string allocation on a typical system.
*/
#define PyStringObject_SIZE (offsetof(PyStringObject, ob_sval) + 1)
/*
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 `size' parameter (for
PyString_FromStringAndSize()) or the length of the string in the `str'
parameter (for PyString_FromString()).
*/
PyObject *
PyString_FromStringAndSize(const char *str, Py_ssize_t 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 > PY_SSIZE_T_MAX - PyStringObject_SIZE) {
PyErr_SetString(PyExc_OverflowError, "string is too large");
return NULL;
}
/* Inline PyObject_NewVar */
op = (PyStringObject *)PyObject_MALLOC(PyStringObject_SIZE + 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)
Py_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 > PY_SSIZE_T_MAX - PyStringObject_SIZE) {
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(PyStringObject_SIZE + size);
if (op == NULL)
return PyErr_NoMemory();
PyObject_INIT_VAR(op, &PyString_Type, size);
op->ob_shash = -1;
op->ob_sstate = SSTATE_NOT_INTERNED;
Py_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;
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 == '%') {
#ifdef HAVE_LONG_LONG
int longlongflag = 0;
#endif
const char* p = f;
while (*++f && *f != '%' && !isalpha(Py_CHARMASK(*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') {
if (f[1] == 'd' || f[1] == 'u') {
++f;
}
#ifdef HAVE_LONG_LONG
else if (f[1] == 'l' &&
(f[2] == 'd' || f[2] == 'u')) {
longlongflag = 1;
f += 2;
}
#endif
}
else if (*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);
#ifdef HAVE_LONG_LONG
/* Need at most
ceil(log10(256)*SIZEOF_LONG_LONG) digits,
plus 1 for the sign. 53/22 is an upper
bound for log10(256). */
if (longlongflag)
n += 2 + (SIZEOF_LONG_LONG*53-1) / 22;
else
#endif
/* 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++;
Py_ssize_t i;
int longflag = 0;
#ifdef HAVE_LONG_LONG
int longlongflag = 0;
#endif
int size_tflag = 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 %ld, %lu, %lld and %llu. */
if (*f == 'l') {
if (f[1] == 'd' || f[1] == 'u') {
longflag = 1;
++f;
}
#ifdef HAVE_LONG_LONG
else if (f[1] == 'l' &&
(f[2] == 'd' || f[2] == 'u')) {
longlongflag = 1;
f += 2;
}
#endif
}
/* handle the size_t flag. */
else 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));
#ifdef HAVE_LONG_LONG
else if (longlongflag)
sprintf(s, "%" PY_FORMAT_LONG_LONG "d",
va_arg(vargs, PY_LONG_LONG));
#endif
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));
#ifdef HAVE_LONG_LONG
else if (longlongflag)
sprintf(s, "%" PY_FORMAT_LONG_LONG "u",
va_arg(vargs, PY_LONG_LONG));
#endif
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:
if (_PyString_Resize(&string, s - PyString_AS_STRING(string)))
return NULL;
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,
Py_ssize_t 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)",
Py_TYPE(v)->tp_name);
Py_DECREF(v);
goto onError;
}
return v;
onError:
return NULL;
}
PyObject *PyString_Encode(const char *s,
Py_ssize_t 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)",
Py_TYPE(v)->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 */
Py_REFCNT(op) = 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.");
}
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 *PyString_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 = 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;
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(PyString_Check(w));
r = PyString_AS_STRING(w);
rn = PyString_GET_SIZE(w);
Py_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 (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(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;
}
/* skip \x */
if (s < end && isxdigit(Py_CHARMASK(s[0])))
s++; /* and a hexdigit */
break;
#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 arbitrary number of unescaped
UTF-8 bytes may follow. */
}
}
if (p-buf < newlen && _PyString_Resize(&v, p - buf))
goto failed;
return v;
failed:
Py_DECREF(v);
return NULL;
}
/* -------------------------------------------------------------------- */
/* object api */
static Py_ssize_t
string_getsize(register PyObject *op)
{
char *s;
Py_ssize_t len;
if (PyString_AsStringAndSize(op, &s, &len))
return -1;
return len;
}
static /*const*/ char *
string_getbuffer(register PyObject *op)
{
char *s;
Py_ssize_t len;
if (PyString_AsStringAndSize(op, &s, &len))
return NULL;
return s;
}
Py_ssize_t
PyString_Size(register PyObject *op)
{
if (!PyString_Check(op))
return string_getsize(op);
return Py_SIZE(op);
}
/*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 Py_ssize_t *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", Py_TYPE(obj)->tp_name);
return -1;
}
}
*s = PyString_AS_STRING(obj);
if (len != NULL)
*len = PyString_GET_SIZE(obj);
else if (strlen(*s) != (size_t)PyString_GET_SIZE(obj)) {
PyErr_SetString(PyExc_TypeError,
"expected string without null bytes");
return -1;
}
return 0;
}
/* -------------------------------------------------------------------- */
/* Methods */
#include "stringlib/stringdefs.h"
#include "stringlib/fastsearch.h"
#include "stringlib/count.h"
#include "stringlib/find.h"
#include "stringlib/partition.h"
#include "stringlib/split.h"
#define _Py_InsertThousandsGrouping _PyString_InsertThousandsGrouping
#include "stringlib/localeutil.h"
static int
string_print(PyStringObject *op, FILE *fp, int flags)
{
Py_ssize_t i, str_len;
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) {
char *data = op->ob_sval;
Py_ssize_t size = Py_SIZE(op);
Py_BEGIN_ALLOW_THREADS
while (size > INT_MAX) {
/* Very long strings cannot be written atomically.
* But don't write exactly INT_MAX bytes at a time
* to avoid memory aligment issues.
*/
const int chunk_size = INT_MAX & ~0x3FFF;
fwrite(data, 1, chunk_size, fp);
data += chunk_size;
size -= chunk_size;
}
#ifdef __VMS
if (size) fwrite(data, (int)size, 1, fp);
#else
fwrite(data, 1, (int)size, fp);
#endif
Py_END_ALLOW_THREADS
return 0;
}
/* figure out which quote to use; single is preferred */
quote = '\'';
if (memchr(op->ob_sval, '\'', Py_SIZE(op)) &&
!memchr(op->ob_sval, '"', Py_SIZE(op)))
quote = '"';
str_len = Py_SIZE(op);
Py_BEGIN_ALLOW_THREADS
fputc(quote, fp);
for (i = 0; i < str_len; i++) {
/* Since strings are immutable and the caller should have a
reference, accessing the interal buffer should not be an issue
with the GIL released. */
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);
Py_END_ALLOW_THREADS
return 0;
}
PyObject *
PyString_Repr(PyObject *obj, int smartquotes)
{
register PyStringObject* op = (PyStringObject*) obj;
size_t newsize = 2 + 4 * Py_SIZE(op);
PyObject *v;
if (newsize > PY_SSIZE_T_MAX || newsize / 4 != Py_SIZE(op)) {
PyErr_SetString(PyExc_OverflowError,
"string is too large to make repr");
return NULL;
}
v = PyString_FromStringAndSize((char *)NULL, newsize);
if (v == NULL) {
return NULL;
}
else {
register Py_ssize_t 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, '\'', Py_SIZE(op)) &&
!memchr(op->ob_sval, '"', Py_SIZE(op)))
quote = '"';
p = PyString_AS_STRING(v);
*p++ = quote;
for (i = 0; i < Py_SIZE(op); 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';
if (_PyString_Resize(&v, (p - PyString_AS_STRING(v))))
return NULL;
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;
}