diff options
Diffstat (limited to 'Objects')
| -rw-r--r-- | Objects/fileobject.c | 2141 |
1 files changed, 20 insertions, 2121 deletions
diff --git a/Objects/fileobject.c b/Objects/fileobject.c index 2d9fcf9..a0779d4 100644 --- a/Objects/fileobject.c +++ b/Objects/fileobject.c @@ -1,36 +1,7 @@ -/* File object implementation */ +/* File object implementation (what's left of it -- see io.py) */ #define PY_SSIZE_T_CLEAN #include "Python.h" -#include "structmember.h" - -#ifdef HAVE_SYS_TYPES_H -#include <sys/types.h> -#endif /* HAVE_SYS_TYPES_H */ - -#ifdef MS_WINDOWS -#define fileno _fileno -/* can simulate truncate with Win32 API functions; see file_truncate */ -#define HAVE_FTRUNCATE -#define WIN32_LEAN_AND_MEAN -#include <windows.h> -#endif - -#ifdef _MSC_VER -/* Need GetVersion to see if on NT so safe to use _wfopen */ -#define WIN32_LEAN_AND_MEAN -#include <windows.h> -#endif /* _MSC_VER */ - -#if defined(PYOS_OS2) && defined(PYCC_GCC) -#include <io.h> -#endif - -#define BUF(v) PyString_AS_STRING((PyStringObject *)v) - -#ifndef DONT_HAVE_ERRNO_H -#include <errno.h> -#endif #ifdef HAVE_GETC_UNLOCKED #define GETC(f) getc_unlocked(f) @@ -42,7 +13,7 @@ #define FUNLOCKFILE(f) #endif -/* Bits in f_newlinetypes */ +/* Newline flags */ #define NEWLINE_UNKNOWN 0 /* No newline seen, yet */ #define NEWLINE_CR 1 /* \r newline seen */ #define NEWLINE_LF 2 /* \n newline seen */ @@ -52,1212 +23,31 @@ extern "C" { #endif -FILE * -PyFile_AsFile(PyObject *f) -{ - if (f == NULL || !PyFile_Check(f)) - return NULL; - else - return ((PyFileObject *)f)->f_fp; -} - -PyObject * -PyFile_Name(PyObject *f) -{ - if (f == NULL || !PyFile_Check(f)) - return NULL; - else - return ((PyFileObject *)f)->f_name; -} - -/* On Unix, fopen will succeed for directories. - In Python, there should be no file objects referring to - directories, so we need a check. */ - -static PyFileObject* -dircheck(PyFileObject* f) -{ -#if defined(HAVE_FSTAT) && defined(S_IFDIR) && defined(EISDIR) - struct stat buf; - if (f->f_fp == NULL) - return f; - if (fstat(fileno(f->f_fp), &buf) == 0 && - S_ISDIR(buf.st_mode)) { -#ifdef HAVE_STRERROR - char *msg = strerror(EISDIR); -#else - char *msg = "Is a directory"; -#endif - PyObject *exc = PyObject_CallFunction(PyExc_IOError, "(is)", - EISDIR, msg); - PyErr_SetObject(PyExc_IOError, exc); - Py_XDECREF(exc); - return NULL; - } -#endif - return f; -} - - -static PyObject * -fill_file_fields(PyFileObject *f, FILE *fp, PyObject *name, char *mode, - int (*close)(FILE *)) -{ - assert(name != NULL); - assert(f != NULL); - assert(PyFile_Check(f)); - assert(f->f_fp == NULL); - - Py_DECREF(f->f_name); - Py_DECREF(f->f_mode); - Py_DECREF(f->f_encoding); - - Py_INCREF(name); - f->f_name = name; - - f->f_mode = PyString_FromString(mode); - - f->f_close = close; - f->f_binary = strchr(mode,'b') != NULL; - f->f_buf = NULL; - f->f_univ_newline = (strchr(mode, 'U') != NULL); - f->f_newlinetypes = NEWLINE_UNKNOWN; - f->f_skipnextlf = 0; - Py_INCREF(Py_None); - f->f_encoding = Py_None; - - if (f->f_mode == NULL) - return NULL; - f->f_fp = fp; - f = dircheck(f); - return (PyObject *) f; -} - -/* check for known incorrect mode strings - problem is, platforms are - free to accept any mode characters they like and are supposed to - ignore stuff they don't understand... write or append mode with - universal newline support is expressly forbidden by PEP 278. - Additionally, remove the 'U' from the mode string as platforms - won't know what it is. Non-zero return signals an exception */ -int -_PyFile_SanitizeMode(char *mode) -{ - char *upos; - size_t len = strlen(mode); - - if (!len) { - PyErr_SetString(PyExc_ValueError, "empty mode string"); - return -1; - } - - upos = strchr(mode, 'U'); - if (upos) { - memmove(upos, upos+1, len-(upos-mode)); /* incl null char */ - - if (mode[0] == 'w' || mode[0] == 'a') { - PyErr_Format(PyExc_ValueError, "universal newline " - "mode can only be used with modes " - "starting with 'r'"); - return -1; - } - - if (mode[0] != 'r') { - memmove(mode+1, mode, strlen(mode)+1); - mode[0] = 'r'; - } - - if (!strchr(mode, 'b')) { - memmove(mode+2, mode+1, strlen(mode)); - mode[1] = 'b'; - } - } else if (mode[0] != 'r' && mode[0] != 'w' && mode[0] != 'a') { - PyErr_Format(PyExc_ValueError, "mode string must begin with " - "one of 'r', 'w', 'a' or 'U', not '%.200s'", mode); - return -1; - } - - return 0; -} - -static PyObject * -open_the_file(PyFileObject *f, char *name, char *mode) -{ - char *newmode; - assert(f != NULL); - assert(PyFile_Check(f)); -#ifdef MS_WINDOWS - /* windows ignores the passed name in order to support Unicode */ - assert(f->f_name != NULL); -#else - assert(name != NULL); -#endif - assert(mode != NULL); - assert(f->f_fp == NULL); - - /* probably need to replace 'U' by 'rb' */ - newmode = PyMem_MALLOC(strlen(mode) + 3); - if (!newmode) { - PyErr_NoMemory(); - return NULL; - } - strcpy(newmode, mode); - - if (_PyFile_SanitizeMode(newmode)) { - f = NULL; - goto cleanup; - } - - errno = 0; - -#ifdef MS_WINDOWS - if (PyUnicode_Check(f->f_name)) { - PyObject *wmode; - wmode = PyUnicode_DecodeASCII(newmode, strlen(newmode), NULL); - if (f->f_name && wmode) { - Py_BEGIN_ALLOW_THREADS - /* PyUnicode_AS_UNICODE OK without thread - lock as it is a simple dereference. */ - f->f_fp = _wfopen(PyUnicode_AS_UNICODE(f->f_name), - PyUnicode_AS_UNICODE(wmode)); - Py_END_ALLOW_THREADS - } - Py_XDECREF(wmode); - } -#endif - if (NULL == f->f_fp && NULL != name) { - Py_BEGIN_ALLOW_THREADS - f->f_fp = fopen(name, newmode); - Py_END_ALLOW_THREADS - } - - if (f->f_fp == NULL) { -#if defined _MSC_VER && (_MSC_VER < 1400 || !defined(__STDC_SECURE_LIB__)) - /* MSVC 6 (Microsoft) leaves errno at 0 for bad mode strings, - * across all Windows flavors. When it sets EINVAL varies - * across Windows flavors, the exact conditions aren't - * documented, and the answer lies in the OS's implementation - * of Win32's CreateFile function (whose source is secret). - * Seems the best we can do is map EINVAL to ENOENT. - * Starting with Visual Studio .NET 2005, EINVAL is correctly - * set by our CRT error handler (set in exceptions.c.) - */ - if (errno == 0) /* bad mode string */ - errno = EINVAL; - else if (errno == EINVAL) /* unknown, but not a mode string */ - errno = ENOENT; -#endif - if (errno == EINVAL) - PyErr_Format(PyExc_IOError, "invalid mode: %s", - mode); - else - PyErr_SetFromErrnoWithFilenameObject(PyExc_IOError, f->f_name); - f = NULL; - } - if (f != NULL) - f = dircheck(f); - -cleanup: - PyMem_FREE(newmode); - - return (PyObject *)f; -} +/* External C interface */ PyObject * PyFile_FromFile(FILE *fp, char *name, char *mode, int (*close)(FILE *)) { - PyObject *io = NULL, *stream = NULL; + PyObject *io, *stream, *nameobj; io = PyImport_ImportModule("io"); if (io == NULL) return NULL; - stream = PyObject_CallMethod(io, "open", "ss", name, mode); - if (stream == NULL) { - Py_XDECREF(io); - return NULL; - } - if (close != NULL) - close(fp); - return stream; -} - -PyObject * -PyFile_FromString(char *name, char *mode) -{ - extern int fclose(FILE *); - PyFileObject *f; - - f = (PyFileObject *)PyFile_FromFile((FILE *)NULL, name, mode, fclose); - if (f != NULL) { - if (open_the_file(f, name, mode) == NULL) { - Py_DECREF(f); - f = NULL; - } - } - return (PyObject *)f; -} - -void -PyFile_SetBufSize(PyObject *f, int bufsize) -{ - PyFileObject *file = (PyFileObject *)f; - if (bufsize >= 0) { - int type; - switch (bufsize) { - case 0: - type = _IONBF; - break; -#ifdef HAVE_SETVBUF - case 1: - type = _IOLBF; - bufsize = BUFSIZ; - break; -#endif - default: - type = _IOFBF; -#ifndef HAVE_SETVBUF - bufsize = BUFSIZ; -#endif - break; - } - fflush(file->f_fp); - if (type == _IONBF) { - PyMem_Free(file->f_setbuf); - file->f_setbuf = NULL; - } else { - file->f_setbuf = (char *)PyMem_Realloc(file->f_setbuf, - bufsize); - } -#ifdef HAVE_SETVBUF - setvbuf(file->f_fp, file->f_setbuf, type, bufsize); -#else /* !HAVE_SETVBUF */ - setbuf(file->f_fp, file->f_setbuf); -#endif /* !HAVE_SETVBUF */ - } -} - -/* Set the encoding used to output Unicode strings. - Returh 1 on success, 0 on failure. */ - -int -PyFile_SetEncoding(PyObject *f, const char *enc) -{ - PyFileObject *file = (PyFileObject*)f; - PyObject *str = PyString_FromString(enc); - - assert(PyFile_Check(f)); - if (!str) - return 0; - Py_DECREF(file->f_encoding); - file->f_encoding = str; - return 1; -} - -static PyObject * -err_closed(void) -{ - PyErr_SetString(PyExc_ValueError, "I/O operation on closed file"); - return NULL; -} - -/* Refuse regular file I/O if there's data in the iteration-buffer. - * Mixing them would cause data to arrive out of order, as the read* - * methods don't use the iteration buffer. */ -static PyObject * -err_iterbuffered(void) -{ - PyErr_SetString(PyExc_ValueError, - "Mixing iteration and read methods would lose data"); - return NULL; -} - -static void drop_readahead(PyFileObject *); - -/* Methods */ - -static void -file_dealloc(PyFileObject *f) -{ - int sts = 0; - if (f->weakreflist != NULL) - PyObject_ClearWeakRefs((PyObject *) f); - if (f->f_fp != NULL && f->f_close != NULL) { - Py_BEGIN_ALLOW_THREADS - sts = (*f->f_close)(f->f_fp); - Py_END_ALLOW_THREADS - if (sts == EOF) -#ifdef HAVE_STRERROR - PySys_WriteStderr("close failed: [Errno %d] %s\n", errno, strerror(errno)); -#else - PySys_WriteStderr("close failed: [Errno %d]\n", errno); -#endif - } - PyMem_Free(f->f_setbuf); - Py_XDECREF(f->f_name); - Py_XDECREF(f->f_mode); - Py_XDECREF(f->f_encoding); - drop_readahead(f); - f->ob_type->tp_free((PyObject *)f); -} - -static PyObject * -file_repr(PyFileObject *f) -{ - if (PyUnicode_Check(f->f_name)) { - PyObject *ret = NULL; - PyObject *name = PyUnicode_AsUnicodeEscapeString(f->f_name); - const char *name_str = name ? PyString_AsString(name) : "?"; - ret = PyUnicode_FromFormat("<%s file u'%s', mode '%s' at %p>", - f->f_fp == NULL ? "closed" : "open", - name_str, - PyString_AsString(f->f_mode), - f); - Py_XDECREF(name); - return ret; - } else { - return PyUnicode_FromFormat("<%s file '%s', mode '%s' at %p>", - f->f_fp == NULL ? "closed" : "open", - PyString_AsString(f->f_name), - PyString_AsString(f->f_mode), - f); - } -} - -static PyObject * -file_close(PyFileObject *f) -{ - int sts = 0; - 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; - } - PyMem_Free(f->f_setbuf); - f->f_setbuf = NULL; - if (sts == EOF) - return PyErr_SetFromErrno(PyExc_IOError); - if (sts != 0) - return PyInt_FromLong((long)sts); - Py_INCREF(Py_None); - return Py_None; -} - - -/* Our very own off_t-like type, 64-bit if possible */ -#if !defined(HAVE_LARGEFILE_SUPPORT) -typedef off_t Py_off_t; -#elif SIZEOF_OFF_T >= 8 -typedef off_t Py_off_t; -#elif SIZEOF_FPOS_T >= 8 -typedef fpos_t Py_off_t; -#else -#error "Large file support, but neither off_t nor fpos_t is large enough." -#endif - - -/* a portable fseek() function - return 0 on success, non-zero on failure (with errno set) */ -static int -_portable_fseek(FILE *fp, Py_off_t offset, int whence) -{ -#if !defined(HAVE_LARGEFILE_SUPPORT) - return fseek(fp, offset, whence); -#elif defined(HAVE_FSEEKO) && SIZEOF_OFF_T >= 8 - return fseeko(fp, offset, whence); -#elif defined(HAVE_FSEEK64) - return fseek64(fp, offset, whence); -#elif defined(__BEOS__) - return _fseek(fp, offset, whence); -#elif SIZEOF_FPOS_T >= 8 - /* lacking a 64-bit capable fseek(), use a 64-bit capable fsetpos() - and fgetpos() to implement fseek()*/ - fpos_t pos; - switch (whence) { - case SEEK_END: -#ifdef MS_WINDOWS - fflush(fp); - if (_lseeki64(fileno(fp), 0, 2) == -1) - return -1; -#else - if (fseek(fp, 0, SEEK_END) != 0) - return -1; -#endif - /* fall through */ - case SEEK_CUR: - if (fgetpos(fp, &pos) != 0) - return -1; - offset += pos; - break; - /* case SEEK_SET: break; */ - } - return fsetpos(fp, &offset); -#else -#error "Large file support, but no way to fseek." -#endif -} - - -/* a portable ftell() function - Return -1 on failure with errno set appropriately, current file - position on success */ -static Py_off_t -_portable_ftell(FILE* fp) -{ -#if !defined(HAVE_LARGEFILE_SUPPORT) - return ftell(fp); -#elif defined(HAVE_FTELLO) && SIZEOF_OFF_T >= 8 - return ftello(fp); -#elif defined(HAVE_FTELL64) - return ftell64(fp); -#elif SIZEOF_FPOS_T >= 8 - fpos_t pos; - if (fgetpos(fp, &pos) != 0) - return -1; - return pos; -#else -#error "Large file support, but no way to ftell." -#endif -} - - -static PyObject * -file_seek(PyFileObject *f, PyObject *args) -{ - int whence; - int ret; - Py_off_t offset; - PyObject *offobj, *off_index; - - if (f->f_fp == NULL) - return err_closed(); - drop_readahead(f); - whence = 0; - if (!PyArg_ParseTuple(args, "O|i:seek", &offobj, &whence)) + stream = PyObject_CallMethod(io, "open", "is", fileno(fp), mode); + Py_DECREF(io); + if (stream == NULL) return NULL; - off_index = PyNumber_Index(offobj); - if (!off_index) { - if (!PyFloat_Check(offobj)) - return NULL; - /* Deprecated in 2.6 */ + nameobj = PyUnicode_FromString(name); + if (nameobj == NULL) PyErr_Clear(); - if (PyErr_Warn(PyExc_DeprecationWarning, - "integer argument expected, got float")) - return NULL; - off_index = offobj; - Py_INCREF(offobj); - } -#if !defined(HAVE_LARGEFILE_SUPPORT) - offset = PyInt_AsLong(off_index); -#else - offset = PyLong_Check(off_index) ? - PyLong_AsLongLong(off_index) : PyInt_AsLong(off_index); -#endif - Py_DECREF(off_index); - if (PyErr_Occurred()) - return NULL; - - Py_BEGIN_ALLOW_THREADS - errno = 0; - ret = _portable_fseek(f->f_fp, offset, whence); - Py_END_ALLOW_THREADS - - if (ret != 0) { - PyErr_SetFromErrno(PyExc_IOError); - clearerr(f->f_fp); - return NULL; - } - f->f_skipnextlf = 0; - Py_INCREF(Py_None); - return Py_None; -} - - -#ifdef HAVE_FTRUNCATE -static PyObject * -file_truncate(PyFileObject *f, PyObject *args) -{ - Py_off_t newsize; - PyObject *newsizeobj = NULL; - Py_off_t initialpos; - int ret; - - if (f->f_fp == NULL) - return err_closed(); - if (!PyArg_UnpackTuple(args, "truncate", 0, 1, &newsizeobj)) - return NULL; - - /* Get current file position. If the file happens to be open for - * update and the last operation was an input operation, C doesn't - * define what the later fflush() will do, but we promise truncate() - * won't change the current position (and fflush() *does* change it - * then at least on Windows). The easiest thing is to capture - * current pos now and seek back to it at the end. - */ - Py_BEGIN_ALLOW_THREADS - errno = 0; - initialpos = _portable_ftell(f->f_fp); - Py_END_ALLOW_THREADS - if (initialpos == -1) - goto onioerror; - - /* Set newsize to current postion if newsizeobj NULL, else to the - * specified value. - */ - 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 */ - newsize = initialpos; - - /* Flush the stream. We're mixing stream-level I/O with lower-level - * I/O, and a flush may be necessary to synch both platform views - * of the current file state. - */ - Py_BEGIN_ALLOW_THREADS - errno = 0; - ret = fflush(f->f_fp); - Py_END_ALLOW_THREADS - if (ret != 0) - goto onioerror; - -#ifdef MS_WINDOWS - /* MS _chsize doesn't work if newsize doesn't fit in 32 bits, - so don't even try using it. */ - { - HANDLE hFile; - - /* Have to move current pos to desired endpoint on Windows. */ - Py_BEGIN_ALLOW_THREADS - errno = 0; - ret = _portable_fseek(f->f_fp, newsize, SEEK_SET) != 0; - Py_END_ALLOW_THREADS - if (ret) - goto onioerror; - - /* Truncate. Note that this may grow the file! */ - Py_BEGIN_ALLOW_THREADS - errno = 0; - hFile = (HANDLE)_get_osfhandle(fileno(f->f_fp)); - ret = hFile == (HANDLE)-1; - if (ret == 0) { - ret = SetEndOfFile(hFile) == 0; - if (ret) - errno = EACCES; - } - Py_END_ALLOW_THREADS - if (ret) - goto onioerror; - } -#else - Py_BEGIN_ALLOW_THREADS - errno = 0; - ret = ftruncate(fileno(f->f_fp), newsize); - Py_END_ALLOW_THREADS - if (ret != 0) - goto onioerror; -#endif /* !MS_WINDOWS */ - - /* Restore original file position. */ - Py_BEGIN_ALLOW_THREADS - errno = 0; - ret = _portable_fseek(f->f_fp, initialpos, SEEK_SET) != 0; - Py_END_ALLOW_THREADS - if (ret) - goto onioerror; - - Py_INCREF(Py_None); - return Py_None; - -onioerror: - PyErr_SetFromErrno(PyExc_IOError); - clearerr(f->f_fp); - return NULL; -} -#endif /* HAVE_FTRUNCATE */ - -static PyObject * -file_tell(PyFileObject *f) -{ - Py_off_t pos; - - if (f->f_fp == NULL) - return err_closed(); - Py_BEGIN_ALLOW_THREADS - errno = 0; - pos = _portable_ftell(f->f_fp); - Py_END_ALLOW_THREADS - if (pos == -1) { - PyErr_SetFromErrno(PyExc_IOError); - clearerr(f->f_fp); - return NULL; - } - if (f->f_skipnextlf) { - int c; - c = GETC(f->f_fp); - if (c == '\n') { - pos++; - f->f_skipnextlf = 0; - } else if (c != EOF) ungetc(c, f->f_fp); - } -#if !defined(HAVE_LARGEFILE_SUPPORT) - return PyInt_FromLong(pos); -#else - return PyLong_FromLongLong(pos); -#endif -} - -static PyObject * -file_fileno(PyFileObject *f) -{ - if (f->f_fp == NULL) - return err_closed(); - return PyInt_FromLong((long) fileno(f->f_fp)); -} - -static PyObject * -file_flush(PyFileObject *f) -{ - int res; - - if (f->f_fp == NULL) - return err_closed(); - 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(PyFileObject *f) -{ - long res; - if (f->f_fp == NULL) - return err_closed(); - Py_BEGIN_ALLOW_THREADS - res = isatty((int)fileno(f->f_fp)); - Py_END_ALLOW_THREADS - return PyBool_FromLong(res); -} - - -#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(PyFileObject *f, size_t currentsize) -{ -#ifdef HAVE_FSTAT - off_t 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; -} - -#if defined(EWOULDBLOCK) && defined(EAGAIN) && EWOULDBLOCK != EAGAIN -#define BLOCKED_ERRNO(x) ((x) == EWOULDBLOCK || (x) == EAGAIN) -#else -#ifdef EWOULDBLOCK -#define BLOCKED_ERRNO(x) ((x) == EWOULDBLOCK) -#else -#ifdef EAGAIN -#define BLOCKED_ERRNO(x) ((x) == EAGAIN) -#else -#define BLOCKED_ERRNO(x) 0 -#endif -#endif -#endif - -static PyObject * -file_read(PyFileObject *f, PyObject *args) -{ - long bytesrequested = -1; - size_t bytesread, buffersize, chunksize; - PyObject *v; - - if (f->f_fp == NULL) - return err_closed(); - /* refuse to mix with f.next() */ - if (f->f_buf != NULL && - (f->f_bufend - f->f_bufptr) > 0 && - f->f_buf[0] != '\0') - return err_iterbuffered(); - if (!PyArg_ParseTuple(args, "|l:read", &bytesrequested)) - return NULL; - if (bytesrequested < 0) - buffersize = new_buffersize(f, (size_t)0); - else - buffersize = bytesrequested; - if (buffersize > PY_SSIZE_T_MAX) { - PyErr_SetString(PyExc_OverflowError, - "requested number of bytes is more than a Python string can hold"); - return NULL; - } - v = PyString_FromStringAndSize((char *)NULL, buffersize); - if (v == NULL) - return NULL; - bytesread = 0; - for (;;) { - Py_BEGIN_ALLOW_THREADS - errno = 0; - chunksize = Py_UniversalNewlineFread(BUF(v) + bytesread, - buffersize - bytesread, f->f_fp, (PyObject *)f); - Py_END_ALLOW_THREADS - if (chunksize == 0) { - if (!ferror(f->f_fp)) - break; - clearerr(f->f_fp); - /* When in non-blocking mode, data shouldn't - * be discarded if a blocking signal was - * received. That will also happen if - * chunksize != 0, but bytesread < buffersize. */ - if (bytesread > 0 && BLOCKED_ERRNO(errno)) - break; - PyErr_SetFromErrno(PyExc_IOError); - Py_DECREF(v); - return NULL; - } - bytesread += chunksize; - if (bytesread < buffersize) { - clearerr(f->f_fp); - break; - } - if (bytesrequested < 0) { - buffersize = new_buffersize(f, buffersize); - if (_PyString_Resize(&v, buffersize) < 0) - return NULL; - } else { - /* Got what was requested. */ - break; - } - } - if (bytesread != buffersize) - _PyString_Resize(&v, bytesread); - return v; -} - -static PyObject * -file_readinto(PyFileObject *f, PyObject *args) -{ - char *ptr; - Py_ssize_t ntodo; - Py_ssize_t ndone, nnow; - - if (f->f_fp == NULL) - return err_closed(); - if (!f->f_binary) { - PyErr_SetString(PyExc_TypeError, - "readinto() requires binary mode"); - return NULL; - } - /* refuse to mix with f.next() */ - if (f->f_buf != NULL && - (f->f_bufend - f->f_bufptr) > 0 && - f->f_buf[0] != '\0') - return err_iterbuffered(); - if (!PyArg_ParseTuple(args, "w#", &ptr, &ntodo)) - return NULL; - ndone = 0; - while (ntodo > 0) { - Py_BEGIN_ALLOW_THREADS - errno = 0; - nnow = Py_UniversalNewlineFread(ptr+ndone, ntodo, f->f_fp, - (PyObject *)f); - 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_FromSsize_t(ndone); -} - -/************************************************************************** -Routine to get next line using platform fgets(). - -Under MSVC 6: - -+ MS threadsafe getc is very slow (multiple layers of function calls before+ - after each character, to lock+unlock the stream). -+ The stream-locking functions are MS-internal -- can't access them from user - code. -+ There's nothing Tim could find in the MS C or platform SDK libraries that - can worm around this. -+ MS fgets locks/unlocks only once per line; it's the only hook we have. - -So we use fgets for speed(!), despite that it's painful. - -MS realloc is also slow. - -Reports from other platforms on this method vs getc_unlocked (which MS doesn't -have): - Linux a wash - Solaris a wash - Tru64 Unix getline_via_fgets significantly faster - -CAUTION: The C std isn't clear about this: in those cases where fgets -writes something into the buffer, can it write into any position beyond the -required trailing null byte? MSVC 6 fgets does not, and no platform is (yet) -known on which it does; and it would be a strange way to code fgets. Still, -getline_via_fgets may not work correctly if it does. The std test -test_bufio.py should fail if platform fgets() routinely writes beyond the -trailing null byte. #define DONT_USE_FGETS_IN_GETLINE to disable this code. -**************************************************************************/ - -/* Use this routine if told to, or by default on non-get_unlocked() - * platforms unless told not to. Yikes! Let's spell that out: - * On a platform with getc_unlocked(): - * By default, use getc_unlocked(). - * If you want to use fgets() instead, #define USE_FGETS_IN_GETLINE. - * On a platform without getc_unlocked(): - * By default, use fgets(). - * If you don't want to use fgets(), #define DONT_USE_FGETS_IN_GETLINE. - */ -#if !defined(USE_FGETS_IN_GETLINE) && !defined(HAVE_GETC_UNLOCKED) -#define USE_FGETS_IN_GETLINE -#endif - -#if defined(DONT_USE_FGETS_IN_GETLINE) && defined(USE_FGETS_IN_GETLINE) -#undef USE_FGETS_IN_GETLINE -#endif - -#ifdef USE_FGETS_IN_GETLINE -static PyObject* -getline_via_fgets(FILE *fp) -{ -/* INITBUFSIZE is the maximum line length that lets us get away with the fast - * no-realloc, one-fgets()-call path. Boosting it isn't free, because we have - * to fill this much of the buffer with a known value in order to figure out - * how much of the buffer fgets() overwrites. So if INITBUFSIZE is larger - * than "most" lines, we waste time filling unused buffer slots. 100 is - * surely adequate for most peoples' email archives, chewing over source code, - * etc -- "regular old text files". - * MAXBUFSIZE is the maximum line length that lets us get away with the less - * fast (but still zippy) no-realloc, two-fgets()-call path. See above for - * cautions about boosting that. 300 was chosen because the worst real-life - * text-crunching job reported on Python-Dev was a mail-log crawler where over - * half the lines were 254 chars. - */ -#define INITBUFSIZE 100 -#define MAXBUFSIZE 300 - char* p; /* temp */ - char buf[MAXBUFSIZE]; - PyObject* v; /* the string object result */ - char* pvfree; /* address of next free slot */ - char* pvend; /* address one beyond last free slot */ - size_t nfree; /* # of free buffer slots; pvend-pvfree */ - size_t total_v_size; /* total # of slots in buffer */ - size_t increment; /* amount to increment the buffer */ - size_t prev_v_size; - - /* Optimize for normal case: avoid _PyString_Resize if at all - * possible via first reading into stack buffer "buf". - */ - total_v_size = INITBUFSIZE; /* start small and pray */ - pvfree = buf; - for (;;) { - Py_BEGIN_ALLOW_THREADS - pvend = buf + total_v_size; - nfree = pvend - pvfree; - memset(pvfree, '\n', nfree); - assert(nfree < INT_MAX); /* Should be atmost MAXBUFSIZE */ - p = fgets(pvfree, (int)nfree, fp); - Py_END_ALLOW_THREADS - - if (p == NULL) { - clearerr(fp); - if (PyErr_CheckSignals()) - return NULL; - v = PyString_FromStringAndSize(buf, pvfree - buf); - return v; - } - /* fgets read *something* */ - p = memchr(pvfree, '\n', nfree); - if (p != NULL) { - /* Did the \n come from fgets or from us? - * Since fgets stops at the first \n, and then writes - * \0, if it's from fgets a \0 must be next. But if - * that's so, it could not have come from us, since - * the \n's we filled the buffer with have only more - * \n's to the right. - */ - if (p+1 < pvend && *(p+1) == '\0') { - /* It's from fgets: we win! In particular, - * we haven't done any mallocs yet, and can - * build the final result on the first try. - */ - ++p; /* include \n from fgets */ - } - else { - /* Must be from us: fgets didn't fill the - * buffer and didn't find a newline, so it - * must be the last and newline-free line of - * the file. - */ - assert(p > pvfree && *(p-1) == '\0'); - --p; /* don't include \0 from fgets */ - } - v = PyString_FromStringAndSize(buf, p - buf); - return v; - } - /* yuck: fgets overwrote all the newlines, i.e. the entire - * buffer. So this line isn't over yet, or maybe it is but - * we're exactly at EOF. If we haven't already, try using the - * rest of the stack buffer. - */ - assert(*(pvend-1) == '\0'); - if (pvfree == buf) { - pvfree = pvend - 1; /* overwrite trailing null */ - total_v_size = MAXBUFSIZE; - } - else - break; - } - - /* The stack buffer isn't big enough; malloc a string object and read - * into its buffer. - */ - total_v_size = MAXBUFSIZE << 1; - v = PyString_FromStringAndSize((char*)NULL, (int)total_v_size); - if (v == NULL) - return v; - /* copy over everything except the last null byte */ - memcpy(BUF(v), buf, MAXBUFSIZE-1); - pvfree = BUF(v) + MAXBUFSIZE - 1; - - /* Keep reading stuff into v; if it ever ends successfully, break - * after setting p one beyond the end of the line. The code here is - * very much like the code above, except reads into v's buffer; see - * the code above for detailed comments about the logic. - */ - for (;;) { - Py_BEGIN_ALLOW_THREADS - pvend = BUF(v) + total_v_size; - nfree = pvend - pvfree; - memset(pvfree, '\n', nfree); - assert(nfree < INT_MAX); - p = fgets(pvfree, (int)nfree, fp); - Py_END_ALLOW_THREADS - - if (p == NULL) { - clearerr(fp); - if (PyErr_CheckSignals()) { - Py_DECREF(v); - return NULL; - } - p = pvfree; - break; - } - p = memchr(pvfree, '\n', nfree); - if (p != NULL) { - if (p+1 < pvend && *(p+1) == '\0') { - /* \n came from fgets */ - ++p; - break; - } - /* \n came from us; last line of file, no newline */ - assert(p > pvfree && *(p-1) == '\0'); - --p; - break; - } - /* expand buffer and try again */ - assert(*(pvend-1) == '\0'); - increment = total_v_size >> 2; /* mild exponential growth */ - prev_v_size = total_v_size; - total_v_size += increment; - /* check for overflow */ - if (total_v_size <= prev_v_size || - total_v_size > PY_SSIZE_T_MAX) { - PyErr_SetString(PyExc_OverflowError, - "line is longer than a Python string can hold"); - Py_DECREF(v); - return NULL; - } - if (_PyString_Resize(&v, (int)total_v_size) < 0) - return NULL; - /* overwrite the trailing null byte */ - pvfree = BUF(v) + (prev_v_size - 1); - } - if (BUF(v) + total_v_size != p) - _PyString_Resize(&v, p - BUF(v)); - return v; -#undef INITBUFSIZE -#undef MAXBUFSIZE -} -#endif /* ifdef USE_FGETS_IN_GETLINE */ - -/* Internal routine to get a line. - Size argument interpretation: - > 0: max length; - <= 0: read arbitrary line -*/ - -static PyObject * -get_line(PyFileObject *f, int n) -{ - FILE *fp = f->f_fp; - int c; - char *buf, *end; - size_t total_v_size; /* total # of slots in buffer */ - size_t used_v_size; /* # used slots in buffer */ - size_t increment; /* amount to increment the buffer */ - PyObject *v; - int newlinetypes = f->f_newlinetypes; - int skipnextlf = f->f_skipnextlf; - int univ_newline = f->f_univ_newline; - -#if defined(USE_FGETS_IN_GETLINE) - if (n <= 0 && !univ_newline ) - return getline_via_fgets(fp); -#endif - total_v_size = n > 0 ? n : 100; - v = PyString_FromStringAndSize((char *)NULL, total_v_size); - if (v == NULL) - return NULL; - buf = BUF(v); - end = buf + total_v_size; - - for (;;) { - Py_BEGIN_ALLOW_THREADS - FLOCKFILE(fp); - if (univ_newline) { - c = 'x'; /* Shut up gcc warning */ - while ( buf != end && (c = GETC(fp)) != EOF ) { - if (skipnextlf ) { - skipnextlf = 0; - if (c == '\n') { - /* Seeing a \n here with - * skipnextlf true means we - * saw a \r before. - */ - newlinetypes |= NEWLINE_CRLF; - c = GETC(fp); - if (c == EOF) break; - } else { - newlinetypes |= NEWLINE_CR; - } - } - if (c == '\r') { - skipnextlf = 1; - c = '\n'; - } else if ( c == '\n') - newlinetypes |= NEWLINE_LF; - *buf++ = c; - if (c == '\n') break; - } - if ( c == EOF && skipnextlf ) - newlinetypes |= NEWLINE_CR; - } else /* If not universal newlines use the normal loop */ - while ((c = GETC(fp)) != EOF && - (*buf++ = c) != '\n' && - buf != end) - ; - FUNLOCKFILE(fp); - Py_END_ALLOW_THREADS - f->f_newlinetypes = newlinetypes; - f->f_skipnextlf = skipnextlf; - if (c == '\n') - break; - if (c == EOF) { - if (ferror(fp)) { - PyErr_SetFromErrno(PyExc_IOError); - clearerr(fp); - Py_DECREF(v); - return NULL; - } - clearerr(fp); - if (PyErr_CheckSignals()) { - Py_DECREF(v); - return NULL; - } - break; - } - /* Must be because buf == end */ - if (n > 0) - break; - used_v_size = total_v_size; - increment = total_v_size >> 2; /* mild exponential growth */ - total_v_size += increment; - if (total_v_size > PY_SSIZE_T_MAX) { - PyErr_SetString(PyExc_OverflowError, - "line is longer than a Python string can hold"); - Py_DECREF(v); - return NULL; - } - if (_PyString_Resize(&v, total_v_size) < 0) - return NULL; - buf = BUF(v) + used_v_size; - end = BUF(v) + total_v_size; + else { + if (PyObject_SetAttrString(stream, "name", nameobj) < 0) + PyErr_Clear(); + Py_DECREF(nameobj); } - - used_v_size = buf - BUF(v); - if (used_v_size != total_v_size) - _PyString_Resize(&v, used_v_size); - return v; + return stream; } -/* External C interface */ - PyObject * PyFile_GetLine(PyObject *f, int n) { @@ -1268,18 +58,7 @@ PyFile_GetLine(PyObject *f, int n) return NULL; } - if (PyFile_Check(f)) { - PyFileObject *fo = (PyFileObject *)f; - if (fo->f_fp == NULL) - return err_closed(); - /* refuse to mix with f.next() */ - if (fo->f_buf != NULL && - (fo->f_bufend - fo->f_bufptr) > 0 && - fo->f_buf[0] != '\0') - return err_iterbuffered(); - result = get_line(fo, n); - } - else { + { PyObject *reader; PyObject *args; @@ -1349,759 +128,6 @@ PyFile_GetLine(PyObject *f, int n) return result; } -/* Python method */ - -static PyObject * -file_readline(PyFileObject *f, PyObject *args) -{ - int n = -1; - - if (f->f_fp == NULL) - return err_closed(); - /* refuse to mix with f.next() */ - if (f->f_buf != NULL && - (f->f_bufend - f->f_bufptr) > 0 && - f->f_buf[0] != '\0') - return err_iterbuffered(); - if (!PyArg_ParseTuple(args, "|i:readline", &n)) - return NULL; - if (n == 0) - return PyString_FromString(""); - if (n < 0) - n = 0; - return get_line(f, n); -} - -static PyObject * -file_readlines(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; - int shortread = 0; - - if (f->f_fp == NULL) - return err_closed(); - /* refuse to mix with f.next() */ - if (f->f_buf != NULL && - (f->f_bufend - f->f_bufptr) > 0 && - f->f_buf[0] != '\0') - return err_iterbuffered(); - if (!PyArg_ParseTuple(args, "|l:readlines", &sizehint)) - return NULL; - if ((list = PyList_New(0)) == NULL) - return NULL; - for (;;) { - if (shortread) - nread = 0; - else { - Py_BEGIN_ALLOW_THREADS - errno = 0; - nread = Py_UniversalNewlineFread(buffer+nfilled, - buffersize-nfilled, f->f_fp, (PyObject *)f); - Py_END_ALLOW_THREADS - shortread = (nread < buffersize-nfilled); - } - 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 = (char *)memchr(buffer+nfilled, '\n', nread); - if (p == NULL) { - /* Need a larger buffer to fit this line */ - nfilled += nread; - buffersize *= 2; - if (buffersize > PY_SSIZE_T_MAX) { - PyErr_SetString(PyExc_OverflowError, - "line is longer than a Python string can hold"); - goto error; - } - 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 */ - if ( _PyString_Resize(&big_buffer, buffersize) < 0 ) - goto error; - 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 = (char *)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 = get_line(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: - Py_XDECREF(big_buffer); - return list; -} - -static PyObject * -file_write(PyFileObject *f, PyObject *args) -{ - char *s; - Py_ssize_t n, n2; - if (f->f_fp == NULL) - return err_closed(); - if (!PyArg_ParseTuple(args, f->f_binary ? "s#" : "t#", &s, &n)) - return NULL; - 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(PyFileObject *f, PyObject *seq) -{ -#define CHUNKSIZE 1000 - PyObject *list, *line; - PyObject *it; /* iter(seq) */ - PyObject *result; - int index, islist; - Py_ssize_t i, j, nwritten, len; - - assert(seq != NULL); - if (f->f_fp == NULL) - return err_closed(); - - result = NULL; - list = NULL; - islist = PyList_Check(seq); - if (islist) - it = NULL; - else { - it = PyObject_GetIter(seq); - if (it == NULL) { - PyErr_SetString(PyExc_TypeError, - "writelines() requires an iterable argument"); - return NULL; - } - /* From here on, fail by going to error, to reclaim "it". */ - list = PyList_New(CHUNKSIZE); - if (list == NULL) - goto error; - } - - /* 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. */ - for (index = 0; ; index += CHUNKSIZE) { - if (islist) { - Py_XDECREF(list); - list = PyList_GetSlice(seq, index, index+CHUNKSIZE); - if (list == NULL) - goto error; - j = PyList_GET_SIZE(list); - } - else { - for (j = 0; j < CHUNKSIZE; j++) { - line = PyIter_Next(it); - if (line == NULL) { - if (PyErr_Occurred()) - goto error; - break; - } - PyList_SetItem(list, j, line); - } - } - if (j == 0) - break; - - /* Check that all entries are indeed strings. If not, - apply the same rules as for file.write() and - convert the results to strings. This is slow, but - seems to be the only way since all conversion APIs - could potentially execute Python code. */ - for (i = 0; i < j; i++) { - PyObject *v = PyList_GET_ITEM(list, i); - if (!PyString_Check(v)) { - const char *buffer; - if (((f->f_binary && - PyObject_AsReadBuffer(v, - (const void**)&buffer, - &len)) || - PyObject_AsCharBuffer(v, - &buffer, - &len))) { - PyErr_SetString(PyExc_TypeError, - "writelines() argument must be a sequence of strings"); - goto error; - } - line = PyString_FromStringAndSize(buffer, - len); - if (line == NULL) - goto error; - Py_DECREF(v); - PyList_SET_ITEM(list, i, line); - } - } - - /* Since we are releasing the global lock, the - following code may *not* execute Python code. */ - Py_BEGIN_ALLOW_THREADS - 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; - } - - Py_INCREF(Py_None); - result = Py_None; - error: - Py_XDECREF(list); - Py_XDECREF(it); - return result; -#undef CHUNKSIZE -} - -static PyObject * -file_self(PyFileObject *f) -{ - if (f->f_fp == NULL) - return err_closed(); - Py_INCREF(f); - return (PyObject *)f; -} - -static PyObject * -file_exit(PyFileObject *f, PyObject *args) -{ - PyObject *ret = file_close(f); - if (!ret) - /* If error occurred, pass through */ - return NULL; - Py_DECREF(ret); - /* We cannot return the result of close since a true - * value will be interpreted as "yes, swallow the - * exception if one was raised inside the with block". */ - Py_RETURN_NONE; -} - -PyDoc_STRVAR(readline_doc, -"readline([size]) -> next line from the file, as a string.\n" -"\n" -"Retain newline. A non-negative size argument limits the maximum\n" -"number of bytes to return (an incomplete line may be returned then).\n" -"Return an empty string at EOF."); - -PyDoc_STRVAR(read_doc, -"read([size]) -> read at most size bytes, returned as a string.\n" -"\n" -"If the size argument is negative or omitted, read until EOF is reached.\n" -"Notice that when in non-blocking mode, less data than what was requested\n" -"may be returned, even if no size parameter was given."); - -PyDoc_STRVAR(write_doc, -"write(str) -> None. Write string str to file.\n" -"\n" -"Note that due to buffering, flush() or close() may be needed before\n" -"the file on disk reflects the data written."); - -PyDoc_STRVAR(fileno_doc, -"fileno() -> integer \"file descriptor\".\n" -"\n" -"This is needed for lower-level file interfaces, such os.read()."); - -PyDoc_STRVAR(seek_doc, -"seek(offset[, whence]) -> None. Move to new file position.\n" -"\n" -"Argument offset is a byte count. Optional argument whence defaults to\n" -"0 (offset from start of file, offset should be >= 0); other values are 1\n" -"(move relative to current position, positive or negative), and 2 (move\n" -"relative to end of file, usually negative, although many platforms allow\n" -"seeking beyond the end of a file). If the file is opened in text mode,\n" -"only offsets returned by tell() are legal. Use of other offsets causes\n" -"undefined behavior." -"\n" -"Note that not all file objects are seekable."); - -#ifdef HAVE_FTRUNCATE -PyDoc_STRVAR(truncate_doc, -"truncate([size]) -> None. Truncate the file to at most size bytes.\n" -"\n" -"Size defaults to the current file position, as returned by tell()."); -#endif - -PyDoc_STRVAR(tell_doc, -"tell() -> current file position, an integer (may be a long integer)."); - -PyDoc_STRVAR(readinto_doc, -"readinto() -> Undocumented. Don't use this; it may go away."); - -PyDoc_STRVAR(readlines_doc, -"readlines([size]) -> list of strings, each a line from the file.\n" -"\n" -"Call readline() repeatedly and return a list of the lines so read.\n" -"The optional size argument, if given, is an approximate bound on the\n" -"total number of bytes in the lines returned."); - -PyDoc_STRVAR(writelines_doc, -"writelines(sequence_of_strings) -> None. Write the strings to the file.\n" -"\n" -"Note that newlines are not added. The sequence can be any iterable object\n" -"producing strings. This is equivalent to calling write() for each string."); - -PyDoc_STRVAR(flush_doc, -"flush() -> None. Flush the internal I/O buffer."); - -PyDoc_STRVAR(close_doc, -"close() -> None or (perhaps) an integer. Close the file.\n" -"\n" -"Sets data attribute .closed to True. A closed file cannot be used for\n" -"further I/O operations. close() may be called more than once without\n" -"error. Some kinds of file objects (for example, opened by popen())\n" -"may return an exit status upon closing."); - -PyDoc_STRVAR(isatty_doc, -"isatty() -> true or false. True if the file is connected to a tty device."); - -PyDoc_STRVAR(enter_doc, - "__enter__() -> self."); - -PyDoc_STRVAR(exit_doc, - "__exit__(*excinfo) -> None. Closes the file."); - -static PyMethodDef file_methods[] = { - {"readline", (PyCFunction)file_readline, METH_VARARGS, readline_doc}, - {"read", (PyCFunction)file_read, METH_VARARGS, read_doc}, - {"write", (PyCFunction)file_write, METH_VARARGS, write_doc}, - {"fileno", (PyCFunction)file_fileno, METH_NOARGS, fileno_doc}, - {"seek", (PyCFunction)file_seek, METH_VARARGS, seek_doc}, -#ifdef HAVE_FTRUNCATE - {"truncate", (PyCFunction)file_truncate, METH_VARARGS, truncate_doc}, -#endif - {"tell", (PyCFunction)file_tell, METH_NOARGS, tell_doc}, - {"readinto", (PyCFunction)file_readinto, METH_VARARGS, readinto_doc}, - {"readlines", (PyCFunction)file_readlines,METH_VARARGS, readlines_doc}, - {"writelines",(PyCFunction)file_writelines, METH_O, writelines_doc}, - {"flush", (PyCFunction)file_flush, METH_NOARGS, flush_doc}, - {"close", (PyCFunction)file_close, METH_NOARGS, close_doc}, - {"isatty", (PyCFunction)file_isatty, METH_NOARGS, isatty_doc}, - {"__enter__", (PyCFunction)file_self, METH_NOARGS, enter_doc}, - {"__exit__", (PyCFunction)file_exit, METH_VARARGS, exit_doc}, - {NULL, NULL} /* sentinel */ -}; - -#define OFF(x) offsetof(PyFileObject, x) - -static PyMemberDef file_memberlist[] = { - {"mode", T_OBJECT, OFF(f_mode), RO, - "file mode ('r', 'U', 'w', 'a', possibly with 'b' or '+' added)"}, - {"name", T_OBJECT, OFF(f_name), RO, - "file name"}, - {"encoding", T_OBJECT, OFF(f_encoding), RO, - "file encoding"}, - /* getattr(f, "closed") is implemented without this table */ - {NULL} /* Sentinel */ -}; - -static PyObject * -get_closed(PyFileObject *f, void *closure) -{ - return PyBool_FromLong((long)(f->f_fp == 0)); -} -static PyObject * -get_newlines(PyFileObject *f, void *closure) -{ - switch (f->f_newlinetypes) { - case NEWLINE_UNKNOWN: - Py_INCREF(Py_None); - return Py_None; - case NEWLINE_CR: - return PyString_FromString("\r"); - case NEWLINE_LF: - return PyString_FromString("\n"); - case NEWLINE_CR|NEWLINE_LF: - return Py_BuildValue("(ss)", "\r", "\n"); - case NEWLINE_CRLF: - return PyString_FromString("\r\n"); - case NEWLINE_CR|NEWLINE_CRLF: - return Py_BuildValue("(ss)", "\r", "\r\n"); - case NEWLINE_LF|NEWLINE_CRLF: - return Py_BuildValue("(ss)", "\n", "\r\n"); - case NEWLINE_CR|NEWLINE_LF|NEWLINE_CRLF: - return Py_BuildValue("(sss)", "\r", "\n", "\r\n"); - default: - PyErr_Format(PyExc_SystemError, - "Unknown newlines value 0x%x\n", - f->f_newlinetypes); - return NULL; - } -} - -static PyGetSetDef file_getsetlist[] = { - {"closed", (getter)get_closed, NULL, "True if the file is closed"}, - {"newlines", (getter)get_newlines, NULL, - "end-of-line convention used in this file"}, - {0}, -}; - -static void -drop_readahead(PyFileObject *f) -{ - if (f->f_buf != NULL) { - PyMem_Free(f->f_buf); - f->f_buf = NULL; - } -} - -/* Make sure that file has a readahead buffer with at least one byte - (unless at EOF) and no more than bufsize. Returns negative value on - error, will set MemoryError if bufsize bytes cannot be allocated. */ -static int -readahead(PyFileObject *f, int bufsize) -{ - Py_ssize_t chunksize; - - if (f->f_buf != NULL) { - if( (f->f_bufend - f->f_bufptr) >= 1) - return 0; - else - drop_readahead(f); - } - if ((f->f_buf = (char *)PyMem_Malloc(bufsize)) == NULL) { - PyErr_NoMemory(); - return -1; - } - Py_BEGIN_ALLOW_THREADS - errno = 0; - chunksize = Py_UniversalNewlineFread( - f->f_buf, bufsize, f->f_fp, (PyObject *)f); - Py_END_ALLOW_THREADS - if (chunksize == 0) { - if (ferror(f->f_fp)) { - PyErr_SetFromErrno(PyExc_IOError); - clearerr(f->f_fp); - drop_readahead(f); - return -1; - } - } - f->f_bufptr = f->f_buf; - f->f_bufend = f->f_buf + chunksize; - return 0; -} - -/* Used by file_iternext. The returned string will start with 'skip' - uninitialized bytes followed by the remainder of the line. Don't be - horrified by the recursive call: maximum recursion depth is limited by - logarithmic buffer growth to about 50 even when reading a 1gb line. */ - -static PyStringObject * -readahead_get_line_skip(PyFileObject *f, int skip, int bufsize) -{ - PyStringObject* s; - char *bufptr; - char *buf; - Py_ssize_t len; - - if (f->f_buf == NULL) - if (readahead(f, bufsize) < 0) - return NULL; - - len = f->f_bufend - f->f_bufptr; - if (len == 0) - return (PyStringObject *) - PyString_FromStringAndSize(NULL, skip); - bufptr = (char *)memchr(f->f_bufptr, '\n', len); - if (bufptr != NULL) { - bufptr++; /* Count the '\n' */ - len = bufptr - f->f_bufptr; - s = (PyStringObject *) - PyString_FromStringAndSize(NULL, skip+len); - if (s == NULL) - return NULL; - memcpy(PyString_AS_STRING(s)+skip, f->f_bufptr, len); - f->f_bufptr = bufptr; - if (bufptr == f->f_bufend) - drop_readahead(f); - } else { - bufptr = f->f_bufptr; - buf = f->f_buf; - f->f_buf = NULL; /* Force new readahead buffer */ - assert(skip+len < INT_MAX); - s = readahead_get_line_skip( - f, (int)(skip+len), bufsize + (bufsize>>2) ); - if (s == NULL) { - PyMem_Free(buf); - return NULL; - } - memcpy(PyString_AS_STRING(s)+skip, bufptr, len); - PyMem_Free(buf); - } - return s; -} - -/* A larger buffer size may actually decrease performance. */ -#define READAHEAD_BUFSIZE 8192 - -static PyObject * -file_iternext(PyFileObject *f) -{ - PyStringObject* l; - - if (f->f_fp == NULL) - return err_closed(); - - l = readahead_get_line_skip(f, 0, READAHEAD_BUFSIZE); - if (l == NULL || PyString_GET_SIZE(l) == 0) { - Py_XDECREF(l); - return NULL; - } - return (PyObject *)l; -} - - -static PyObject * -file_new(PyTypeObject *type, PyObject *args, PyObject *kwds) -{ - PyObject *self; - static PyObject *not_yet_string; - - PyErr_SetString(PyExc_SystemError, "attempt to create old file"); - return NULL; - - assert(type != NULL && type->tp_alloc != NULL); - - if (not_yet_string == NULL) { - not_yet_string = PyString_FromString("<uninitialized file>"); - if (not_yet_string == NULL) - return NULL; - } - - self = type->tp_alloc(type, 0); - if (self != NULL) { - /* Always fill in the name and mode, so that nobody else - needs to special-case NULLs there. */ - Py_INCREF(not_yet_string); - ((PyFileObject *)self)->f_name = not_yet_string; - Py_INCREF(not_yet_string); - ((PyFileObject *)self)->f_mode = not_yet_string; - Py_INCREF(Py_None); - ((PyFileObject *)self)->f_encoding = Py_None; - ((PyFileObject *)self)->weakreflist = NULL; - } - return self; -} - -static int -file_init(PyObject *self, PyObject *args, PyObject *kwds) -{ - PyFileObject *foself = (PyFileObject *)self; - int ret = 0; - static char *kwlist[] = {"name", "mode", "buffering", 0}; - char *name = NULL; - char *mode = "r"; - int bufsize = -1; - int wideargument = 0; - - assert(PyFile_Check(self)); - if (foself->f_fp != NULL) { - /* Have to close the existing file first. */ - PyObject *closeresult = file_close(foself); - if (closeresult == NULL) - return -1; - Py_DECREF(closeresult); - } - -#ifdef Py_WIN_WIDE_FILENAMES - if (GetVersion() < 0x80000000) { /* On NT, so wide API available */ - PyObject *po; - if (PyArg_ParseTupleAndKeywords(args, kwds, "U|si:file", - kwlist, &po, &mode, &bufsize)) { - wideargument = 1; - if (fill_file_fields(foself, NULL, po, mode, - fclose) == NULL) - goto Error; - } else { - /* Drop the argument parsing error as narrow - strings are also valid. */ - PyErr_Clear(); - } - } -#endif - - if (!wideargument) { - PyObject *o_name; - - if (!PyArg_ParseTupleAndKeywords(args, kwds, "et|si:file", kwlist, - Py_FileSystemDefaultEncoding, - &name, - &mode, &bufsize)) - return -1; - - /* We parse again to get the name as a PyObject */ - if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|si:file", - kwlist, &o_name, &mode, - &bufsize)) - goto Error; - - if (fill_file_fields(foself, NULL, o_name, mode, - fclose) == NULL) - goto Error; - } - if (open_the_file(foself, name, mode) == NULL) - goto Error; - foself->f_setbuf = NULL; - PyFile_SetBufSize(self, bufsize); - goto Done; - -Error: - ret = -1; - /* fall through */ -Done: - PyMem_Free(name); /* free the encoded string */ - return ret; -} - -PyDoc_VAR(file_doc) = -PyDoc_STR( -"file(name[, mode[, buffering]]) -> file object\n" -"\n" -"Open a file. The mode can be 'r', 'w' or 'a' for reading (default),\n" -"writing or appending. The file will be created if it doesn't exist\n" -"when opened for writing or appending; it will be truncated when\n" -"opened for writing. Add a 'b' to the mode for binary files.\n" -"Add a '+' to the mode to allow simultaneous reading and writing.\n" -"If the buffering argument is given, 0 means unbuffered, 1 means line\n" -"buffered, and larger numbers specify the buffer size.\n" -) -PyDoc_STR( -"Add a 'U' to mode to open the file for input with universal newline\n" -"support. Any line ending in the input file will be seen as a '\\n'\n" -"in Python. Also, a file so opened gains the attribute 'newlines';\n" -"the value for this attribute is one of None (no newline read yet),\n" -"'\\r', '\\n', '\\r\\n' or a tuple containing all the newline types seen.\n" -"\n" -"'U' cannot be combined with 'w' or '+' mode.\n" -); - -PyTypeObject PyFile_Type = { - PyObject_HEAD_INIT(&PyType_Type) - 0, - "file", - sizeof(PyFileObject), - 0, - (destructor)file_dealloc, /* tp_dealloc */ - 0, /* tp_print */ - 0, /* tp_getattr */ - 0, /* tp_setattr */ - 0, /* tp_compare */ - (reprfunc)file_repr, /* tp_repr */ - 0, /* tp_as_number */ - 0, /* tp_as_sequence */ - 0, /* tp_as_mapping */ - 0, /* tp_hash */ - 0, /* tp_call */ - 0, /* tp_str */ - PyObject_GenericGetAttr, /* tp_getattro */ - 0, /* tp_setattro */ - 0, /* tp_as_buffer */ - Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ - file_doc, /* tp_doc */ - 0, /* tp_traverse */ - 0, /* tp_clear */ - 0, /* tp_richcompare */ - offsetof(PyFileObject, weakreflist), /* tp_weaklistoffset */ - (getiterfunc)file_self, /* tp_iter */ - (iternextfunc)file_iternext, /* tp_iternext */ - file_methods, /* tp_methods */ - file_memberlist, /* tp_members */ - file_getsetlist, /* tp_getset */ - 0, /* tp_base */ - 0, /* tp_dict */ - 0, /* tp_descr_get */ - 0, /* tp_descr_set */ - 0, /* tp_dictoffset */ - file_init, /* tp_init */ - PyType_GenericAlloc, /* tp_alloc */ - file_new, /* tp_new */ - PyObject_Del, /* tp_free */ -}; - /* Interfaces to write objects/strings to file-like objects */ int @@ -2112,28 +138,6 @@ PyFile_WriteObject(PyObject *v, PyObject *f, int flags) PyErr_SetString(PyExc_TypeError, "writeobject with NULL file"); return -1; } - else if (PyFile_Check(f)) { - FILE *fp = PyFile_AsFile(f); - PyObject *enc = ((PyFileObject*)f)->f_encoding; - int result; - if (fp == NULL) { - err_closed(); - return -1; - } - if ((flags & Py_PRINT_RAW) && - PyUnicode_Check(v) && enc != Py_None) { - char *cenc = PyString_AS_STRING(enc); - value = PyUnicode_AsEncodedString(v, cenc, "strict"); - if (value == NULL) - return -1; - } else { - value = v; - Py_INCREF(value); - } - result = PyObject_Print(value, fp, flags); - Py_DECREF(value); - return result; - } writer = PyObject_GetAttrString(f, "write"); if (writer == NULL) return -1; @@ -2176,15 +180,6 @@ PyFile_WriteString(const char *s, PyObject *f) "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; @@ -2205,7 +200,8 @@ PyFile_WriteString(const char *s, PyObject *f) -1 is returned on failure. */ -int PyObject_AsFileDescriptor(PyObject *o) +int +PyObject_AsFileDescriptor(PyObject *o) { int fd; PyObject *meth; @@ -2255,10 +251,6 @@ int PyObject_AsFileDescriptor(PyObject *o) return fd; } -/* From here on we need access to the real fgets and fread */ -#undef fgets -#undef fread - /* ** Py_UniversalNewlineFgets is an fgets variation that understands ** all of \r, \n and \r\n conventions. @@ -2280,18 +272,10 @@ Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj) int c; int newlinetypes = 0; int skipnextlf = 0; - int univ_newline = 1; if (fobj) { - if (!PyFile_Check(fobj)) { - errno = ENXIO; /* What can you do... */ - return NULL; - } - univ_newline = ((PyFileObject *)fobj)->f_univ_newline; - if ( !univ_newline ) - return fgets(buf, n, stream); - newlinetypes = ((PyFileObject *)fobj)->f_newlinetypes; - skipnextlf = ((PyFileObject *)fobj)->f_skipnextlf; + errno = ENXIO; /* What can you do... */ + return NULL; } FLOCKFILE(stream); c = 'x'; /* Shut up gcc warning */ @@ -2331,10 +315,7 @@ Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj) newlinetypes |= NEWLINE_CR; FUNLOCKFILE(stream); *p = '\0'; - if (fobj) { - ((PyFileObject *)fobj)->f_newlinetypes = newlinetypes; - ((PyFileObject *)fobj)->f_skipnextlf = skipnextlf; - } else if ( skipnextlf ) { + if ( skipnextlf ) { /* If we have no file object we cannot save the ** skipnextlf flag. We have to readahead, which ** will cause a pause if we're reading from an @@ -2351,88 +332,6 @@ Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj) return buf; } -/* -** Py_UniversalNewlineFread is an fread variation that understands -** all of \r, \n and \r\n conventions. -** The stream should be opened in binary mode. -** fobj must be a PyFileObject. In this case there -** is no readahead but in stead a flag is used to skip a following -** \n on the next read. Also, if the file is open in binary mode -** the whole conversion is skipped. Finally, the routine keeps track of -** the different types of newlines seen. -*/ -size_t -Py_UniversalNewlineFread(char *buf, size_t n, - FILE *stream, PyObject *fobj) -{ - char *dst = buf; - PyFileObject *f = (PyFileObject *)fobj; - int newlinetypes, skipnextlf; - - assert(buf != NULL); - assert(stream != NULL); - - if (!fobj || !PyFile_Check(fobj)) { - errno = ENXIO; /* What can you do... */ - return 0; - } - if (!f->f_univ_newline) - return fread(buf, 1, n, stream); - newlinetypes = f->f_newlinetypes; - skipnextlf = f->f_skipnextlf; - /* Invariant: n is the number of bytes remaining to be filled - * in the buffer. - */ - while (n) { - size_t nread; - int shortread; - char *src = dst; - - nread = fread(dst, 1, n, stream); - assert(nread <= n); - if (nread == 0) - break; - - n -= nread; /* assuming 1 byte out for each in; will adjust */ - shortread = n != 0; /* true iff EOF or error */ - while (nread--) { - char c = *src++; - if (c == '\r') { - /* Save as LF and set flag to skip next LF. */ - *dst++ = '\n'; - skipnextlf = 1; - } - else if (skipnextlf && c == '\n') { - /* Skip LF, and remember we saw CR LF. */ - skipnextlf = 0; - newlinetypes |= NEWLINE_CRLF; - ++n; - } - else { - /* Normal char to be stored in buffer. Also - * update the newlinetypes flag if either this - * is an LF or the previous char was a CR. - */ - if (c == '\n') - newlinetypes |= NEWLINE_LF; - else if (skipnextlf) - newlinetypes |= NEWLINE_CR; - *dst++ = c; - skipnextlf = 0; - } - } - if (shortread) { - /* If this is EOF, update type flags. */ - if (skipnextlf && feof(stream)) - newlinetypes |= NEWLINE_CR; - break; - } - } - f->f_newlinetypes = newlinetypes; - f->f_skipnextlf = skipnextlf; - return dst - buf; -} - #ifdef __cplusplus } #endif |