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ee70ad1e52
cpython/Objects/fileobject.c
Guido van Rossum ee70ad1e52 Checking in the new, improve file.writelines() code. 
This (1) avoids thread unsafety whereby another thread could zap the
list while we were using it, and (2) now supports writing arbitrary
sequences of strings.
2000-03-13 16:27:06 +00:00

1175 lines
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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.
******************************************************************/
/* File object implementation */
#include "Python.h"
#include "structmember.h"
#ifndef DONT_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* DONT_HAVE_SYS_TYPES_H */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef MS_WIN32
#define ftruncate _chsize
#define fileno _fileno
#define HAVE_FTRUNCATE
#endif
#ifdef macintosh
#ifdef USE_GUSI
#define HAVE_FTRUNCATE
#endif
#endif
#ifdef THINK_C
#define HAVE_FOPENRF
#endif
#ifdef __MWERKS__
/* Mwerks fopen() doesn't always set errno */
#define NO_FOPEN_ERRNO
#endif
#define BUF(v) PyString_AS_STRING((PyStringObject *)v)
#ifndef DONT_HAVE_ERRNO_H
#include <errno.h>
#endif
typedef struct {
PyObject_HEAD
FILE *f_fp;
PyObject *f_name;
PyObject *f_mode;
int (*f_close) Py_PROTO((FILE *));
int f_softspace; /* Flag used by 'print' command */
int f_binary; /* Flag which indicates whether the file is open
open in binary (1) or test (0) mode */
} PyFileObject;
FILE *
PyFile_AsFile(f)
PyObject *f;
{
if (f == NULL || !PyFile_Check(f))
return NULL;
else
return ((PyFileObject *)f)->f_fp;
}
PyObject *
PyFile_Name(f)
PyObject *f;
{
if (f == NULL || !PyFile_Check(f))
return NULL;
else
return ((PyFileObject *)f)->f_name;
}
PyObject *
PyFile_FromFile(fp, name, mode, close)
FILE *fp;
char *name;
char *mode;
int (*close) Py_FPROTO((FILE *));
{
PyFileObject *f = PyObject_NEW(PyFileObject, &PyFile_Type);
if (f == NULL)
return NULL;
f->f_fp = NULL;
f->f_name = PyString_FromString(name);
f->f_mode = PyString_FromString(mode);
f->f_close = close;
f->f_softspace = 0;
if (strchr(mode,'b') != NULL)
f->f_binary = 1;
else
f->f_binary = 0;
if (f->f_name == NULL || f->f_mode == NULL) {
Py_DECREF(f);
return NULL;
}
f->f_fp = fp;
return (PyObject *) f;
}
PyObject *
PyFile_FromString(name, mode)
char *name, *mode;
{
extern int fclose Py_PROTO((FILE *));
PyFileObject *f;
f = (PyFileObject *) PyFile_FromFile((FILE *)NULL, name, mode, fclose);
if (f == NULL)
return NULL;
#ifdef HAVE_FOPENRF
if (*mode == '*') {
FILE *fopenRF();
f->f_fp = fopenRF(name, mode+1);
}
else
#endif
{
Py_BEGIN_ALLOW_THREADS
f->f_fp = fopen(name, mode);
Py_END_ALLOW_THREADS
}
if (f->f_fp == NULL) {
#ifdef NO_FOPEN_ERRNO
/* Metroworks only, not testable, so unchanged */
if ( errno == 0 ) {
PyErr_SetString(PyExc_IOError, "Cannot open file");
Py_DECREF(f);
return NULL;
}
#endif
PyErr_SetFromErrnoWithFilename(PyExc_IOError, name);
Py_DECREF(f);
return NULL;
}
return (PyObject *)f;
}
void
PyFile_SetBufSize(f, bufsize)
PyObject *f;
int bufsize;
{
if (bufsize >= 0) {
#ifdef HAVE_SETVBUF
int type;
switch (bufsize) {
case 0:
type = _IONBF;
break;
case 1:
type = _IOLBF;
bufsize = BUFSIZ;
break;
default:
type = _IOFBF;
}
setvbuf(((PyFileObject *)f)->f_fp, (char *)NULL,
type, bufsize);
#else /* !HAVE_SETVBUF */
if (bufsize <= 1)
setbuf(((PyFileObject *)f)->f_fp, (char *)NULL);
#endif /* !HAVE_SETVBUF */
}
}
static PyObject *
err_closed()
{
PyErr_SetString(PyExc_ValueError, "I/O operation on closed file");
return NULL;
}
/* Methods */
static void
file_dealloc(f)
PyFileObject *f;
{
if (f->f_fp != NULL && f->f_close != NULL) {
Py_BEGIN_ALLOW_THREADS
(*f->f_close)(f->f_fp);
Py_END_ALLOW_THREADS
}
if (f->f_name != NULL) {
Py_DECREF(f->f_name);
}
if (f->f_mode != NULL) {
Py_DECREF(f->f_mode);
}
free((char *)f);
}
static PyObject *
file_repr(f)
PyFileObject *f;
{
char buf[300];
sprintf(buf, "<%s file '%.256s', mode '%.10s' at %lx>",
f->f_fp == NULL ? "closed" : "open",
PyString_AsString(f->f_name),
PyString_AsString(f->f_mode),
(long)f);
return PyString_FromString(buf);
}
static PyObject *
file_close(f, args)
PyFileObject *f;
PyObject *args;
{
int sts = 0;
if (!PyArg_NoArgs(args))
return NULL;
if (f->f_fp != NULL) {
if (f->f_close != NULL) {
Py_BEGIN_ALLOW_THREADS
errno = 0;
sts = (*f->f_close)(f->f_fp);
Py_END_ALLOW_THREADS
}
f->f_fp = NULL;
}
if (sts == EOF)
return PyErr_SetFromErrno(PyExc_IOError);
if (sts != 0)
return PyInt_FromLong((long)sts);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
file_seek(f, args)
PyFileObject *f;
PyObject *args;
{
int whence;
int ret;
off_t offset;
PyObject *offobj;
if (f->f_fp == NULL)
return err_closed();
whence = 0;
if (!PyArg_ParseTuple(args, "O|i:seek", &offobj, &whence))
return NULL;
#if !defined(HAVE_LARGEFILE_SUPPORT)
offset = PyInt_AsLong(offobj);
#else
offset = PyLong_Check(offobj) ?
PyLong_AsLongLong(offobj) : PyInt_AsLong(offobj);
#endif
if (PyErr_Occurred())
return NULL;
Py_BEGIN_ALLOW_THREADS
errno = 0;
#if defined(HAVE_FSEEKO)
ret = fseeko(f->f_fp, offset, whence);
#elif defined(HAVE_FSEEK64)
ret = fseek64(f->f_fp, offset, whence);
#else
ret = fseek(f->f_fp, offset, whence);
#endif
Py_END_ALLOW_THREADS
if (ret != 0) {
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
#ifdef HAVE_FTRUNCATE
static PyObject *
file_truncate(f, args)
PyFileObject *f;
PyObject *args;
{
int ret;
off_t newsize;
PyObject *newsizeobj;
if (f->f_fp == NULL)
return err_closed();
newsizeobj = NULL;
if (!PyArg_ParseTuple(args, "|O:truncate", &newsizeobj))
return NULL;
if (newsizeobj != NULL) {
#if !defined(HAVE_LARGEFILE_SUPPORT)
newsize = PyInt_AsLong(newsizeobj);
#else
newsize = PyLong_Check(newsizeobj) ?
PyLong_AsLongLong(newsizeobj) :
PyInt_AsLong(newsizeobj);
#endif
if (PyErr_Occurred())
return NULL;
} else {
/* Default to current position*/
Py_BEGIN_ALLOW_THREADS
errno = 0;
#if defined(HAVE_FTELLO) && defined(HAVE_LARGEFILE_SUPPORT)
newsize = ftello(f->f_fp);
#elif defined(HAVE_FTELL64) && defined(HAVE_LARGEFILE_SUPPORT)
newsize = ftell64(f->f_fp);
#else
newsize = ftell(f->f_fp);
#endif
Py_END_ALLOW_THREADS
if (newsize == -1) {
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
return NULL;
}
}
Py_BEGIN_ALLOW_THREADS
errno = 0;
ret = fflush(f->f_fp);
Py_END_ALLOW_THREADS
if (ret == 0) {
Py_BEGIN_ALLOW_THREADS
errno = 0;
ret = ftruncate(fileno(f->f_fp), newsize);
Py_END_ALLOW_THREADS
}
if (ret != 0) {
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
#endif /* HAVE_FTRUNCATE */
static PyObject *
file_tell(f, args)
PyFileObject *f;
PyObject *args;
{
off_t offset;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_NoArgs(args))
return NULL;
Py_BEGIN_ALLOW_THREADS
errno = 0;
#if defined(HAVE_FTELLO) && defined(HAVE_LARGEFILE_SUPPORT)
offset = ftello(f->f_fp);
#elif defined(HAVE_FTELL64) && defined(HAVE_LARGEFILE_SUPPORT)
offset = ftell64(f->f_fp);
#else
offset = ftell(f->f_fp);
#endif
Py_END_ALLOW_THREADS
if (offset == -1) {
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
return NULL;
}
#if !defined(HAVE_LARGEFILE_SUPPORT)
return PyInt_FromLong(offset);
#else
return PyLong_FromLongLong(offset);
#endif
}
static PyObject *
file_fileno(f, args)
PyFileObject *f;
PyObject *args;
{
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_NoArgs(args))
return NULL;
return PyInt_FromLong((long) fileno(f->f_fp));
}
static PyObject *
file_flush(f, args)
PyFileObject *f;
PyObject *args;
{
int res;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_NoArgs(args))
return NULL;
Py_BEGIN_ALLOW_THREADS
errno = 0;
res = fflush(f->f_fp);
Py_END_ALLOW_THREADS
if (res != 0) {
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
file_isatty(f, args)
PyFileObject *f;
PyObject *args;
{
long res;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_NoArgs(args))
return NULL;
Py_BEGIN_ALLOW_THREADS
res = isatty((int)fileno(f->f_fp));
Py_END_ALLOW_THREADS
return PyInt_FromLong(res);
}
/* We expect that fstat exists on most systems.
It's confirmed on Unix, Mac and Windows.
If you don't have it, add #define DONT_HAVE_FSTAT to your config.h. */
#ifndef DONT_HAVE_FSTAT
#define HAVE_FSTAT
#ifndef DONT_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifndef DONT_HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#endif /* DONT_HAVE_FSTAT */
#if BUFSIZ < 8192
#define SMALLCHUNK 8192
#else
#define SMALLCHUNK BUFSIZ
#endif
#if SIZEOF_INT < 4
#define BIGCHUNK (512 * 32)
#else
#define BIGCHUNK (512 * 1024)
#endif
static size_t
new_buffersize(f, currentsize)
PyFileObject *f;
size_t currentsize;
{
#ifdef HAVE_FSTAT
long pos, end;
struct stat st;
if (fstat(fileno(f->f_fp), &st) == 0) {
end = st.st_size;
/* The following is not a bug: we really need to call lseek()
*and* ftell(). The reason is that some stdio libraries
mistakenly flush their buffer when ftell() is called and
the lseek() call it makes fails, thereby throwing away
data that cannot be recovered in any way. To avoid this,
we first test lseek(), and only call ftell() if lseek()
works. We can't use the lseek() value either, because we
need to take the amount of buffered data into account.
(Yet another reason why stdio stinks. :-) */
pos = lseek(fileno(f->f_fp), 0L, SEEK_CUR);
if (pos >= 0)
pos = ftell(f->f_fp);
if (pos < 0)
clearerr(f->f_fp);
if (end > pos && pos >= 0)
return currentsize + end - pos + 1;
/* Add 1 so if the file were to grow we'd notice. */
}
#endif
if (currentsize > SMALLCHUNK) {
/* Keep doubling until we reach BIGCHUNK;
then keep adding BIGCHUNK. */
if (currentsize <= BIGCHUNK)
return currentsize + currentsize;
else
return currentsize + BIGCHUNK;
}
return currentsize + SMALLCHUNK;
}
static PyObject *
file_read(f, args)
PyFileObject *f;
PyObject *args;
{
long bytesrequested = -1;
size_t bytesread, buffersize, chunksize;
PyObject *v;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_ParseTuple(args, "|l:read", &bytesrequested))
return NULL;
if (bytesrequested < 0)
buffersize = new_buffersize(f, (size_t)0);
else
buffersize = bytesrequested;
v = PyString_FromStringAndSize((char *)NULL, buffersize);
if (v == NULL)
return NULL;
bytesread = 0;
for (;;) {
Py_BEGIN_ALLOW_THREADS
errno = 0;
chunksize = fread(BUF(v) + bytesread, 1,
buffersize - bytesread, f->f_fp);
Py_END_ALLOW_THREADS
if (chunksize == 0) {
if (!ferror(f->f_fp))
break;
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
Py_DECREF(v);
return NULL;
}
bytesread += chunksize;
if (bytesread < buffersize)
break;
if (bytesrequested < 0) {
buffersize = new_buffersize(f, buffersize);
if (_PyString_Resize(&v, buffersize) < 0)
return NULL;
}
}
if (bytesread != buffersize)
_PyString_Resize(&v, bytesread);
return v;
}
static PyObject *
file_readinto(f, args)
PyFileObject *f;
PyObject *args;
{
char *ptr;
int ntodo, ndone, nnow;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_Parse(args, "w#", &ptr, &ntodo))
return NULL;
ndone = 0;
while (ntodo > 0) {
Py_BEGIN_ALLOW_THREADS
errno = 0;
nnow = fread(ptr+ndone, 1, ntodo, f->f_fp);
Py_END_ALLOW_THREADS
if (nnow == 0) {
if (!ferror(f->f_fp))
break;
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
return NULL;
}
ndone += nnow;
ntodo -= nnow;
}
return PyInt_FromLong(ndone);
}
/* Internal routine to get a line.
Size argument interpretation:
> 0: max length;
= 0: read arbitrary line;
< 0: strip trailing '\n', raise EOFError if EOF reached immediately
*/
static PyObject *
getline(f, n)
PyFileObject *f;
int n;
{
register FILE *fp;
register int c;
register char *buf, *end;
int n1, n2;
PyObject *v;
fp = f->f_fp;
n2 = n > 0 ? n : 100;
v = PyString_FromStringAndSize((char *)NULL, n2);
if (v == NULL)
return NULL;
buf = BUF(v);
end = buf + n2;
Py_BEGIN_ALLOW_THREADS
for (;;) {
if ((c = getc(fp)) == EOF) {
clearerr(fp);
Py_BLOCK_THREADS
if (PyErr_CheckSignals()) {
Py_DECREF(v);
return NULL;
}
if (n < 0 && buf == BUF(v)) {
Py_DECREF(v);
PyErr_SetString(PyExc_EOFError,
"EOF when reading a line");
return NULL;
}
Py_UNBLOCK_THREADS
break;
}
if ((*buf++ = c) == '\n') {
if (n < 0)
buf--;
break;
}
if (buf == end) {
if (n > 0)
break;
n1 = n2;
n2 += 1000;
Py_BLOCK_THREADS
if (_PyString_Resize(&v, n2) < 0)
return NULL;
Py_UNBLOCK_THREADS
buf = BUF(v) + n1;
end = BUF(v) + n2;
}
}
Py_END_ALLOW_THREADS
n1 = buf - BUF(v);
if (n1 != n2)
_PyString_Resize(&v, n1);
return v;
}
/* External C interface */
PyObject *
PyFile_GetLine(f, n)
PyObject *f;
int n;
{
if (f == NULL) {
PyErr_BadInternalCall();
return NULL;
}
if (!PyFile_Check(f)) {
PyObject *reader;
PyObject *args;
PyObject *result;
reader = PyObject_GetAttrString(f, "readline");
if (reader == NULL)
return NULL;
if (n <= 0)
args = Py_BuildValue("()");
else
args = Py_BuildValue("(i)", n);
if (args == NULL) {
Py_DECREF(reader);
return NULL;
}
result = PyEval_CallObject(reader, args);
Py_DECREF(reader);
Py_DECREF(args);
if (result != NULL && !PyString_Check(result)) {
Py_DECREF(result);
result = NULL;
PyErr_SetString(PyExc_TypeError,
"object.readline() returned non-string");
}
if (n < 0 && result != NULL) {
char *s = PyString_AsString(result);
int len = PyString_Size(result);
if (len == 0) {
Py_DECREF(result);
result = NULL;
PyErr_SetString(PyExc_EOFError,
"EOF when reading a line");
}
else if (s[len-1] == '\n') {
if (result->ob_refcnt == 1)
_PyString_Resize(&result, len-1);
else {
PyObject *v;
v = PyString_FromStringAndSize(s,
len-1);
Py_DECREF(result);
result = v;
}
}
}
return result;
}
if (((PyFileObject*)f)->f_fp == NULL)
return err_closed();
return getline((PyFileObject *)f, n);
}
/* Python method */
static PyObject *
file_readline(f, args)
PyFileObject *f;
PyObject *args;
{
int n = -1;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_ParseTuple(args, "|i:readline", &n))
return NULL;
if (n == 0)
return PyString_FromString("");
if (n < 0)
n = 0;
return getline(f, n);
}
static PyObject *
file_readlines(f, args)
PyFileObject *f;
PyObject *args;
{
long sizehint = 0;
PyObject *list;
PyObject *line;
char small_buffer[SMALLCHUNK];
char *buffer = small_buffer;
size_t buffersize = SMALLCHUNK;
PyObject *big_buffer = NULL;
size_t nfilled = 0;
size_t nread;
size_t totalread = 0;
char *p, *q, *end;
int err;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_ParseTuple(args, "|l:readlines", &sizehint))
return NULL;
if ((list = PyList_New(0)) == NULL)
return NULL;
for (;;) {
Py_BEGIN_ALLOW_THREADS
errno = 0;
nread = fread(buffer+nfilled, 1, buffersize-nfilled, f->f_fp);
Py_END_ALLOW_THREADS
if (nread == 0) {
sizehint = 0;
if (!ferror(f->f_fp))
break;
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
error:
Py_DECREF(list);
list = NULL;
goto cleanup;
}
totalread += nread;
p = memchr(buffer+nfilled, '\n', nread);
if (p == NULL) {
/* Need a larger buffer to fit this line */
nfilled += nread;
buffersize *= 2;
if (big_buffer == NULL) {
/* Create the big buffer */
big_buffer = PyString_FromStringAndSize(
NULL, buffersize);
if (big_buffer == NULL)
goto error;
buffer = PyString_AS_STRING(big_buffer);
memcpy(buffer, small_buffer, nfilled);
}
else {
/* Grow the big buffer */
_PyString_Resize(&big_buffer, buffersize);
buffer = PyString_AS_STRING(big_buffer);
}
continue;
}
end = buffer+nfilled+nread;
q = buffer;
do {
/* Process complete lines */
p++;
line = PyString_FromStringAndSize(q, p-q);
if (line == NULL)
goto error;
err = PyList_Append(list, line);
Py_DECREF(line);
if (err != 0)
goto error;
q = p;
p = memchr(q, '\n', end-q);
} while (p != NULL);
/* Move the remaining incomplete line to the start */
nfilled = end-q;
memmove(buffer, q, nfilled);
if (sizehint > 0)
if (totalread >= (size_t)sizehint)
break;
}
if (nfilled != 0) {
/* Partial last line */
line = PyString_FromStringAndSize(buffer, nfilled);
if (line == NULL)
goto error;
if (sizehint > 0) {
/* Need to complete the last line */
PyObject *rest = getline(f, 0);
if (rest == NULL) {
Py_DECREF(line);
goto error;
}
PyString_Concat(&line, rest);
Py_DECREF(rest);
if (line == NULL)
goto error;
}
err = PyList_Append(list, line);
Py_DECREF(line);
if (err != 0)
goto error;
}
cleanup:
if (big_buffer) {
Py_DECREF(big_buffer);
}
return list;
}
static PyObject *
file_write(f, args)
PyFileObject *f;
PyObject *args;
{
char *s;
int n, n2;
if (f->f_fp == NULL)
return err_closed();
if (!PyArg_Parse(args, f->f_binary ? "s#" : "t#", &s, &n))
return NULL;
f->f_softspace = 0;
Py_BEGIN_ALLOW_THREADS
errno = 0;
n2 = fwrite(s, 1, n, f->f_fp);
Py_END_ALLOW_THREADS
if (n2 != n) {
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
file_writelines(f, args)
PyFileObject *f;
PyObject *args;
{
#define CHUNKSIZE 1000
PyObject *list, *line;
PyObject *result;
int i, j, index, len, nwritten, islist;
if (f->f_fp == NULL)
return err_closed();
if (args == NULL || !PySequence_Check(args)) {
PyErr_SetString(PyExc_TypeError,
"writelines() requires sequence of strings");
return NULL;
}
islist = PyList_Check(args);
/* Strategy: slurp CHUNKSIZE lines into a private list,
checking that they are all strings, then write that list
without holding the interpreter lock, then come back for more. */
index = 0;
if (islist)
list = NULL;
else {
list = PyList_New(CHUNKSIZE);
if (list == NULL)
return NULL;
}
result = NULL;
for (;;) {
if (islist) {
Py_XDECREF(list);
list = PyList_GetSlice(args, index, index+CHUNKSIZE);
if (list == NULL)
return NULL;
j = PyList_GET_SIZE(list);
}
else {
for (j = 0; j < CHUNKSIZE; j++) {
line = PySequence_GetItem(args, index+j);
if (line == NULL) {
if (PyErr_ExceptionMatches(
PyExc_IndexError))
{
PyErr_Clear();
break;
}
/* Some other error occurred.
XXX We may lose some output. */
goto error;
}
if (!PyString_Check(line)) {
Py_DECREF(line);
PyErr_SetString(PyExc_TypeError,
"writelines() requires sequences of strings");
goto error;
}
PyList_SetItem(list, j, line);
}
}
if (j == 0)
break;
Py_BEGIN_ALLOW_THREADS
f->f_softspace = 0;
errno = 0;
for (i = 0; i < j; i++) {
line = PyList_GET_ITEM(list, i);
len = PyString_GET_SIZE(line);
nwritten = fwrite(PyString_AS_STRING(line),
1, len, f->f_fp);
if (nwritten != len) {
Py_BLOCK_THREADS
PyErr_SetFromErrno(PyExc_IOError);
clearerr(f->f_fp);
goto error;
}
}
Py_END_ALLOW_THREADS
if (j < CHUNKSIZE)
break;
index += CHUNKSIZE;
}
Py_INCREF(Py_None);
result = Py_None;
error:
Py_XDECREF(list);
return result;
}
static PyMethodDef file_methods[] = {
{"readline", (PyCFunction)file_readline, 1},
{"read", (PyCFunction)file_read, 1},
{"write", (PyCFunction)file_write, 0},
{"fileno", (PyCFunction)file_fileno, 0},
{"seek", (PyCFunction)file_seek, 1},
#ifdef HAVE_FTRUNCATE
{"truncate", (PyCFunction)file_truncate, 1},
#endif
{"tell", (PyCFunction)file_tell, 0},
{"readinto", (PyCFunction)file_readinto, 0},
{"readlines", (PyCFunction)file_readlines, 1},
{"writelines", (PyCFunction)file_writelines, 0},
{"flush", (PyCFunction)file_flush, 0},
{"close", (PyCFunction)file_close, 0},
{"isatty", (PyCFunction)file_isatty, 0},
{NULL, NULL} /* sentinel */
};
#define OFF(x) offsetof(PyFileObject, x)
static struct memberlist file_memberlist[] = {
{"softspace", T_INT, OFF(f_softspace)},
{"mode", T_OBJECT, OFF(f_mode), RO},
{"name", T_OBJECT, OFF(f_name), RO},
/* getattr(f, "closed") is implemented without this table */
{"closed", T_INT, 0, RO},
{NULL} /* Sentinel */
};
static PyObject *
file_getattr(f, name)
PyFileObject *f;
char *name;
{
PyObject *res;
res = Py_FindMethod(file_methods, (PyObject *)f, name);
if (res != NULL)
return res;
PyErr_Clear();
if (strcmp(name, "closed") == 0)
return PyInt_FromLong((long)(f->f_fp == 0));
return PyMember_Get((char *)f, file_memberlist, name);
}
static int
file_setattr(f, name, v)
PyFileObject *f;
char *name;
PyObject *v;
{
if (v == NULL) {
PyErr_SetString(PyExc_AttributeError,
"can't delete file attributes");
return -1;
}
return PyMember_Set((char *)f, file_memberlist, name, v);
}
PyTypeObject PyFile_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"file",
sizeof(PyFileObject),
0,
(destructor)file_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)file_getattr, /*tp_getattr*/
(setattrfunc)file_setattr, /*tp_setattr*/
0, /*tp_compare*/
(reprfunc)file_repr, /*tp_repr*/
};
/* Interface for the 'soft space' between print items. */
int
PyFile_SoftSpace(f, newflag)
PyObject *f;
int newflag;
{
int oldflag = 0;
if (f == NULL) {
/* Do nothing */
}
else if (PyFile_Check(f)) {
oldflag = ((PyFileObject *)f)->f_softspace;
((PyFileObject *)f)->f_softspace = newflag;
}
else {
PyObject *v;
v = PyObject_GetAttrString(f, "softspace");
if (v == NULL)
PyErr_Clear();
else {
if (PyInt_Check(v))
oldflag = PyInt_AsLong(v);
Py_DECREF(v);
}
v = PyInt_FromLong((long)newflag);
if (v == NULL)
PyErr_Clear();
else {
if (PyObject_SetAttrString(f, "softspace", v) != 0)
PyErr_Clear();
Py_DECREF(v);
}
}
return oldflag;
}
/* Interfaces to write objects/strings to file-like objects */
int
PyFile_WriteObject(v, f, flags)
PyObject *v;
PyObject *f;
int flags;
{
PyObject *writer, *value, *args, *result;
if (f == NULL) {
PyErr_SetString(PyExc_TypeError, "writeobject with NULL file");
return -1;
}
else if (PyFile_Check(f)) {
FILE *fp = PyFile_AsFile(f);
if (fp == NULL) {
err_closed();
return -1;
}
return PyObject_Print(v, fp, flags);
}
writer = PyObject_GetAttrString(f, "write");
if (writer == NULL)
return -1;
if (flags & Py_PRINT_RAW)
value = PyObject_Str(v);
else
value = PyObject_Repr(v);
if (value == NULL) {
Py_DECREF(writer);
return -1;
}
args = Py_BuildValue("(O)", value);
if (args == NULL) {
Py_DECREF(value);
Py_DECREF(writer);
return -1;
}
result = PyEval_CallObject(writer, args);
Py_DECREF(args);
Py_DECREF(value);
Py_DECREF(writer);
if (result == NULL)
return -1;
Py_DECREF(result);
return 0;
}
int
PyFile_WriteString(s, f)
char *s;
PyObject *f;
{
if (f == NULL) {
/* Should be caused by a pre-existing error */
if(!PyErr_Occurred())
PyErr_SetString(PyExc_SystemError,
"null file for PyFile_WriteString");
return -1;
}
else if (PyFile_Check(f)) {
FILE *fp = PyFile_AsFile(f);
if (fp == NULL) {
err_closed();
return -1;
}
fputs(s, fp);
return 0;
}
else if (!PyErr_Occurred()) {
PyObject *v = PyString_FromString(s);
int err;
if (v == NULL)
return -1;
err = PyFile_WriteObject(v, f, Py_PRINT_RAW);
Py_DECREF(v);
return err;
}
else
return -1;
}
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