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cpython/Objects/stringobject.c
Guido van Rossum 971a7aaeac Change the Fini function to only remove otherwise unreferenced strings 
from the interned table.  There are references in hard-to-find static
variables all over the interpreter, and it's not worth trying to get
rid of all those; but "uninterning" isn't fair either and may cause
subtle failures later -- so we have to keep them in the interned
table.

Also get rid of no-longer-needed insert of None in interned dict.
1997-08-05 02:15:12 +00:00

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/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI or Corporation for National Research Initiatives or
CNRI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.
While CWI is the initial source for this software, a modified version
is made available by the Corporation for National Research Initiatives
(CNRI) at the Internet address ftp://ftp.python.org.
STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
******************************************************************/
/* String object implementation */
#include "Python.h"
#include "mymath.h"
#include <ctype.h>
#ifdef COUNT_ALLOCS
int null_strings, one_strings;
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#else
#ifndef UCHAR_MAX
#define UCHAR_MAX 255
#endif
#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(str, size)
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 */
op = (PyStringObject *)
malloc(sizeof(PyStringObject) + size * sizeof(char));
if (op == NULL)
return PyErr_NoMemory();
op->ob_type = &PyString_Type;
op->ob_size = size;
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
_Py_NewReference(op);
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(str)
const char *str;
{
register unsigned int size = strlen(str);
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 && (op = characters[*str & UCHAR_MAX]) != NULL) {
#ifdef COUNT_ALLOCS
one_strings++;
#endif
Py_INCREF(op);
return (PyObject *)op;
}
#endif /* DONT_SHARE_SHORT_STRINGS */
op = (PyStringObject *)
malloc(sizeof(PyStringObject) + size * sizeof(char));
if (op == NULL)
return PyErr_NoMemory();
op->ob_type = &PyString_Type;
op->ob_size = size;
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
_Py_NewReference(op);
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;
}
static void
string_dealloc(op)
PyObject *op;
{
PyMem_DEL(op);
}
int
PyString_Size(op)
register PyObject *op;
{
if (!PyString_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
return ((PyStringObject *)op) -> ob_size;
}
/*const*/ char *
PyString_AsString(op)
register PyObject *op;
{
if (!PyString_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyStringObject *)op) -> ob_sval;
}
/* Methods */
static int
string_print(op, fp, flags)
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 prefered */
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 < ' ' || c >= 0177)
fprintf(fp, "\\%03o", c & 0377);
else
fputc(c, fp);
}
fputc(quote, fp);
return 0;
}
static PyObject *
string_repr(op)
register PyStringObject *op;
{
/* XXX overflow? */
int newsize = 2 + 4 * op->ob_size * sizeof(char);
PyObject *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 prefered */
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 < ' ' || c >= 0177) {
sprintf(p, "\\%03o", c & 0377);
while (*p != '\0')
p++;
}
else
*p++ = c;
}
*p++ = quote;
*p = '\0';
_PyString_Resize(
&v, (int) (p - ((PyStringObject *)v)->ob_sval));
return v;
}
}
static int
string_length(a)
PyStringObject *a;
{
return a->ob_size;
}
static PyObject *
string_concat(a, bb)
register PyStringObject *a;
register PyObject *bb;
{
register unsigned int size;
register PyStringObject *op;
if (!PyString_Check(bb)) {
PyErr_BadArgument();
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;
op = (PyStringObject *)
malloc(sizeof(PyStringObject) + size * sizeof(char));
if (op == NULL)
return PyErr_NoMemory();
op->ob_type = &PyString_Type;
op->ob_size = size;
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
_Py_NewReference(op);
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(a, n)
register PyStringObject *a;
register int n;
{
register int i;
register int size;
register PyStringObject *op;
if (n < 0)
n = 0;
size = a->ob_size * n;
if (size == a->ob_size) {
Py_INCREF(a);
return (PyObject *)a;
}
op = (PyStringObject *)
malloc(sizeof(PyStringObject) + size * sizeof(char));
if (op == NULL)
return PyErr_NoMemory();
op->ob_type = &PyString_Type;
op->ob_size = size;
#ifdef CACHE_HASH
op->ob_shash = -1;
#endif
#ifdef INTERN_STRINGS
op->ob_sinterned = NULL;
#endif
_Py_NewReference(op);
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(a, i, j)
register PyStringObject *a;
register int i, 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 PyObject *
string_item(a, i)
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(a, b)
PyStringObject *a, *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(a)
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(self, index, ptr)
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(self, index, ptr)
PyStringObject *self;
int index;
const void **ptr;
{
PyErr_SetString(PyExc_TypeError, "Cannot use string as modifyable buffer");
return -1;
}
static int
string_buffer_getsegcount(self, lenp)
PyStringObject *self;
int *lenp;
{
if ( lenp )
*lenp = self->ob_size;
return 1;
}
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*/
};
static PyBufferProcs string_as_buffer = {
(getreadbufferproc)string_buffer_getreadbuf,
(getwritebufferproc)string_buffer_getwritebuf,
(getsegcountproc)string_buffer_getsegcount,
};
PyTypeObject PyString_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"string",
sizeof(PyStringObject),
sizeof(char),
(destructor)string_dealloc, /*tp_dealloc*/
(printfunc)string_print, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
(cmpfunc)string_compare, /*tp_compare*/
(reprfunc)string_repr, /*tp_repr*/
0, /*tp_as_number*/
&string_as_sequence, /*tp_as_sequence*/
0, /*tp_as_mapping*/
(hashfunc)string_hash, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
&string_as_buffer, /*tp_as_buffer*/
0, /*tp_xxx4*/
0, /*tp_doc*/
};
void
PyString_Concat(pv, w)
register PyObject **pv;
register PyObject *w;
{
register PyObject *v;
if (*pv == NULL)
return;
if (w == NULL || !PyString_Check(*pv)) {
Py_DECREF(*pv);
*pv = NULL;
return;
}
v = string_concat((PyStringObject *) *pv, w);
Py_DECREF(*pv);
*pv = v;
}
void
PyString_ConcatAndDel(pv, w)
register PyObject **pv;
register PyObject *w;
{
PyString_Concat(pv, w);
Py_XDECREF(w);
}
/* The following function breaks the notion that strings are immutable:
it changes the size of a string. We get away with this only if there
is only one module referencing the object. You can also think of it
as creating a new string object and destroying the old one, only
more efficiently. In any case, don't use this if the string may
already be known to some other part of the code... */
int
_PyString_Resize(pv, newsize)
PyObject **pv;
int newsize;
{
register PyObject *v;
register PyStringObject *sv;
v = *pv;
if (!PyString_Check(v) || v->ob_refcnt != 1) {
*pv = 0;
Py_DECREF(v);
PyErr_BadInternalCall();
return -1;
}
/* XXX UNREF/NEWREF interface should be more symmetrical */
#ifdef Py_REF_DEBUG
--_Py_RefTotal;
#endif
_Py_ForgetReference(v);
*pv = (PyObject *)
realloc((char *)v,
sizeof(PyStringObject) + newsize * sizeof(char));
if (*pv == NULL) {
PyMem_DEL(v);
PyErr_NoMemory();
return -1;
}
_Py_NewReference(*pv);
sv = (PyStringObject *) *pv;
sv->ob_size = newsize;
sv->ob_sval[newsize] = '\0';
return 0;
}
/* Helpers for formatstring */
static PyObject *
getnextarg(args, arglen, p_argidx)
PyObject *args;
int arglen;
int *p_argidx;
{
int argidx = *p_argidx;
if (argidx < arglen) {
(*p_argidx)++;
if (arglen < 0)
return args;
else
return PyTuple_GetItem(args, argidx);
}
PyErr_SetString(PyExc_TypeError,
"not enough arguments for format string");
return NULL;
}
#define F_LJUST (1<<0)
#define F_SIGN (1<<1)
#define F_BLANK (1<<2)
#define F_ALT (1<<3)
#define F_ZERO (1<<4)
static int
formatfloat(buf, flags, prec, type, v)
char *buf;
int flags;
int prec;
int type;
PyObject *v;
{
char fmt[20];
double x;
if (!PyArg_Parse(v, "d;float argument required", &x))
return -1;
if (prec < 0)
prec = 6;
if (prec > 50)
prec = 50; /* Arbitrary limitation */
if (type == 'f' && fabs(x)/1e25 >= 1e25)
type = 'g';
sprintf(fmt, "%%%s.%d%c", (flags&F_ALT) ? "#" : "", prec, type);
sprintf(buf, fmt, x);
return strlen(buf);
}
static int
formatint(buf, flags, prec, type, v)
char *buf;
int flags;
int prec;
int type;
PyObject *v;
{
char fmt[20];
long x;
if (!PyArg_Parse(v, "l;int argument required", &x))
return -1;
if (prec < 0)
prec = 1;
sprintf(fmt, "%%%s.%dl%c", (flags&F_ALT) ? "#" : "", prec, type);
sprintf(buf, fmt, x);
return strlen(buf);
}
static int
formatchar(buf, v)
char *buf;
PyObject *v;
{
if (PyString_Check(v)) {
if (!PyArg_Parse(v, "c;%c requires int or char", &buf[0]))
return -1;
}
else {
if (!PyArg_Parse(v, "b;%c requires int or char", &buf[0]))
return -1;
}
buf[1] = '\0';
return 1;
}
/* fmt%(v1,v2,...) is roughly equivalent to sprintf(fmt, v1, v2, ...) */
PyObject *
PyString_Format(format, args)
PyObject *format;
PyObject *args;
{
char *fmt, *res;
int fmtcnt, rescnt, reslen, arglen, argidx;
int args_owned = 0;
PyObject *result;
PyObject *dict = NULL;
if (format == NULL || !PyString_Check(format) || args == NULL) {
PyErr_BadInternalCall();
return NULL;
}
fmt = PyString_AsString(format);
fmtcnt = PyString_Size(format);
reslen = rescnt = fmtcnt + 100;
result = PyString_FromStringAndSize((char *)NULL, reslen);
if (result == NULL)
return NULL;
res = PyString_AsString(result);
if (PyTuple_Check(args)) {
arglen = PyTuple_Size(args);
argidx = 0;
}
else {
arglen = -1;
argidx = -2;
}
if (args->ob_type->tp_as_mapping)
dict = args;
while (--fmtcnt >= 0) {
if (*fmt != '%') {
if (--rescnt < 0) {
rescnt = fmtcnt + 100;
reslen += rescnt;
if (_PyString_Resize(&result, reslen) < 0)
return NULL;
res = PyString_AsString(result)
+ reslen - rescnt;
--rescnt;
}
*res++ = *fmt++;
}
else {
/* Got a format specifier */
int flags = 0;
int width = -1;
int prec = -1;
int size = 0;
int c = '\0';
int fill;
PyObject *v = NULL;
PyObject *temp = NULL;
char *buf;
int sign;
int len;
char tmpbuf[120]; /* For format{float,int,char}() */
fmt++;
if (*fmt == '(') {
char *keystart;
int keylen;
PyObject *key;
if (dict == NULL) {
PyErr_SetString(PyExc_TypeError,
"format requires a mapping");
goto error;
}
++fmt;
--fmtcnt;
keystart = fmt;
while (--fmtcnt >= 0 && *fmt != ')')
fmt++;
keylen = fmt - keystart;
++fmt;
if (fmtcnt < 0) {
PyErr_SetString(PyExc_ValueError,
"incomplete format key");
goto error;
}
key = PyString_FromStringAndSize(keystart,
keylen);
if (key == NULL)
goto error;
if (args_owned) {
Py_DECREF(args);
args_owned = 0;
}
args = PyObject_GetItem(dict, key);
Py_DECREF(key);
if (args == NULL) {
goto error;
}
args_owned = 1;
arglen = -1;
argidx = -2;
}
while (--fmtcnt >= 0) {
switch (c = *fmt++) {
case '-': flags |= F_LJUST; continue;
case '+': flags |= F_SIGN; continue;
case ' ': flags |= F_BLANK; continue;
case '#': flags |= F_ALT; continue;
case '0': flags |= F_ZERO; continue;
}
break;
}
if (c == '*') {
v = getnextarg(args, arglen, &argidx);
if (v == NULL)
goto error;
if (!PyInt_Check(v)) {
PyErr_SetString(PyExc_TypeError,
"* wants int");
goto error;
}
width = PyInt_AsLong(v);
if (width < 0)
width = 0;
if (--fmtcnt >= 0)
c = *fmt++;
}
else if (c >= 0 && isdigit(c)) {
width = c - '0';
while (--fmtcnt >= 0) {
c = Py_CHARMASK(*fmt++);
if (!isdigit(c))
break;
if ((width*10) / 10 != width) {
PyErr_SetString(
PyExc_ValueError,
"width too big");
goto error;
}
width = width*10 + (c - '0');
}
}
if (c == '.') {
prec = 0;
if (--fmtcnt >= 0)
c = *fmt++;
if (c == '*') {
v = getnextarg(args, arglen, &argidx);
if (v == NULL)
goto error;
if (!PyInt_Check(v)) {
PyErr_SetString(
PyExc_TypeError,
"* wants int");
goto error;
}
prec = PyInt_AsLong(v);
if (prec < 0)
prec = 0;
if (--fmtcnt >= 0)
c = *fmt++;
}
else if (c >= 0 && isdigit(c)) {
prec = c - '0';
while (--fmtcnt >= 0) {
c = Py_CHARMASK(*fmt++);
if (!isdigit(c))
break;
if ((prec*10) / 10 != prec) {
PyErr_SetString(
PyExc_ValueError,
"prec too big");
goto error;
}
prec = prec*10 + (c - '0');
}
}
} /* prec */
if (fmtcnt >= 0) {
if (c == 'h' || c == 'l' || c == 'L') {
size = c;
if (--fmtcnt >= 0)
c = *fmt++;
}
}
if (fmtcnt < 0) {
PyErr_SetString(PyExc_ValueError,
"incomplete format");
goto error;
}
if (c != '%') {
v = getnextarg(args, arglen, &argidx);
if (v == NULL)
goto error;
}
sign = 0;
fill = ' ';
switch (c) {
case '%':
buf = "%";
len = 1;
break;
case 's':
temp = PyObject_Str(v);
if (temp == NULL)
goto error;
buf = PyString_AsString(temp);
len = PyString_Size(temp);
if (prec >= 0 && len > prec)
len = prec;
break;
case 'i':
case 'd':
case 'u':
case 'o':
case 'x':
case 'X':
if (c == 'i')
c = 'd';
buf = tmpbuf;
len = formatint(buf, flags, prec, c, v);
if (len < 0)
goto error;
sign = (c == 'd');
if (flags&F_ZERO) {
fill = '0';
if ((flags&F_ALT) &&
(c == 'x' || c == 'X') &&
buf[0] == '0' && buf[1] == c) {
*res++ = *buf++;
*res++ = *buf++;
rescnt -= 2;
len -= 2;
width -= 2;
if (width < 0)
width = 0;
}
}
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
buf = tmpbuf;
len = formatfloat(buf, flags, prec, c, v);
if (len < 0)
goto error;
sign = 1;
if (flags&F_ZERO)
fill = '0';
break;
case 'c':
buf = tmpbuf;
len = formatchar(buf, v);
if (len < 0)
goto error;
break;
default:
PyErr_SetString(PyExc_ValueError,
"unsupported format character");
goto error;
}
if (sign) {
if (*buf == '-' || *buf == '+') {
sign = *buf++;
len--;
}
else if (flags & F_SIGN)
sign = '+';
else if (flags & F_BLANK)
sign = ' ';
else
sign = '\0';
}
if (width < len)
width = len;
if (rescnt < width + (sign != '\0')) {
reslen -= rescnt;
rescnt = width + fmtcnt + 100;
reslen += rescnt;
if (_PyString_Resize(&result, reslen) < 0)
return NULL;
res = PyString_AsString(result)
+ reslen - rescnt;
}
if (sign) {
if (fill != ' ')
*res++ = sign;
rescnt--;
if (width > len)
width--;
}
if (width > len && !(flags&F_LJUST)) {
do {
--rescnt;
*res++ = fill;
} while (--width > len);
}
if (sign && fill == ' ')
*res++ = sign;
memcpy(res, buf, len);
res += len;
rescnt -= len;
while (--width >= len) {
--rescnt;
*res++ = ' ';
}
if (dict && (argidx < arglen) && c != '%') {
PyErr_SetString(PyExc_TypeError,
"not all arguments converted");
goto error;
}
Py_XDECREF(temp);
} /* '%' */
} /* until end */
if (argidx < arglen && !dict) {
PyErr_SetString(PyExc_TypeError,
"not all arguments converted");
goto error;
}
if (args_owned)
Py_DECREF(args);
_PyString_Resize(&result, reslen - rescnt);
return result;
error:
Py_DECREF(result);
if (args_owned)
Py_DECREF(args);
return NULL;
}
#ifdef INTERN_STRINGS
static PyObject *interned;
void
PyString_InternInPlace(p)
PyObject **p;
{
register PyStringObject *s = (PyStringObject *)(*p);
PyObject *t;
if (s == NULL || !PyString_Check(s))
Py_FatalError("PyString_InternInPlace: strings only please!");
if ((t = s->ob_sinterned) != NULL) {
if (t == (PyObject *)s)
return;
Py_INCREF(t);
*p = t;
Py_DECREF(s);
return;
}
if (interned == NULL) {
interned = PyDict_New();
if (interned == NULL)
return;
}
if ((t = PyDict_GetItem(interned, (PyObject *)s)) != NULL) {
Py_INCREF(t);
*p = s->ob_sinterned = t;
Py_DECREF(s);
return;
}
t = (PyObject *)s;
if (PyDict_SetItem(interned, t, t) == 0) {
s->ob_sinterned = t;
return;
}
PyErr_Clear();
}
PyObject *
PyString_InternFromString(cp)
const char *cp;
{
PyObject *s = PyString_FromString(cp);
if (s == NULL)
return NULL;
PyString_InternInPlace(&s);
return s;
}
#endif
void
PyString_Fini()
{
int i;
for (i = 0; i < UCHAR_MAX + 1; i++) {
Py_XDECREF(characters[i]);
characters[i] = NULL;
}
#ifndef DONT_SHARE_SHORT_STRINGS
Py_XDECREF(nullstring);
nullstring = NULL;
#endif
#ifdef INTERN_STRINGS
if (interned) {
int pos, changed;
PyObject *key, *value;
do {
changed = 0;
pos = 0;
while (PyDict_Next(interned, &pos, &key, &value)) {
if (key->ob_refcnt == 2 && key == value) {
PyDict_DelItem(interned, key);
changed = 1;
}
}
} while (changed);
}
#endif
}
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