mirror of
https://github.com/python/cpython.git
synced 2024-12-09 09:44:44 +08:00
bde48fd811
incr cannot be larger than INT_MAX: downcast to int explicitly.
416 lines
12 KiB
C
416 lines
12 KiB
C
|
|
/* Readline interface for tokenizer.c and [raw_]input() in bltinmodule.c.
|
|
By default, or when stdin is not a tty device, we have a super
|
|
simple my_readline function using fgets.
|
|
Optionally, we can use the GNU readline library.
|
|
my_readline() has a different return value from GNU readline():
|
|
- NULL if an interrupt occurred or if an error occurred
|
|
- a malloc'ed empty string if EOF was read
|
|
- a malloc'ed string ending in \n normally
|
|
*/
|
|
|
|
#include "Python.h"
|
|
#include "pycore_pystate.h" // _PyThreadState_GET()
|
|
#ifdef MS_WINDOWS
|
|
# define WIN32_LEAN_AND_MEAN
|
|
# include "windows.h"
|
|
#endif /* MS_WINDOWS */
|
|
|
|
|
|
PyThreadState* _PyOS_ReadlineTState = NULL;
|
|
|
|
static PyThread_type_lock _PyOS_ReadlineLock = NULL;
|
|
|
|
int (*PyOS_InputHook)(void) = NULL;
|
|
|
|
/* This function restarts a fgets() after an EINTR error occurred
|
|
except if _PyOS_InterruptOccurred() returns true. */
|
|
|
|
static int
|
|
my_fgets(PyThreadState* tstate, char *buf, int len, FILE *fp)
|
|
{
|
|
#ifdef MS_WINDOWS
|
|
HANDLE handle;
|
|
_Py_BEGIN_SUPPRESS_IPH
|
|
handle = (HANDLE)_get_osfhandle(fileno(fp));
|
|
_Py_END_SUPPRESS_IPH
|
|
|
|
/* bpo-40826: fgets(fp) does crash if fileno(fp) is closed */
|
|
if (handle == INVALID_HANDLE_VALUE) {
|
|
return -1; /* EOF */
|
|
}
|
|
#endif
|
|
|
|
while (1) {
|
|
if (PyOS_InputHook != NULL) {
|
|
(void)(PyOS_InputHook)();
|
|
}
|
|
|
|
errno = 0;
|
|
clearerr(fp);
|
|
char *p = fgets(buf, len, fp);
|
|
if (p != NULL) {
|
|
return 0; /* No error */
|
|
}
|
|
int err = errno;
|
|
|
|
#ifdef MS_WINDOWS
|
|
/* Ctrl-C anywhere on the line or Ctrl-Z if the only character
|
|
on a line will set ERROR_OPERATION_ABORTED. Under normal
|
|
circumstances Ctrl-C will also have caused the SIGINT handler
|
|
to fire which will have set the event object returned by
|
|
_PyOS_SigintEvent. This signal fires in another thread and
|
|
is not guaranteed to have occurred before this point in the
|
|
code.
|
|
|
|
Therefore: check whether the event is set with a small timeout.
|
|
If it is, assume this is a Ctrl-C and reset the event. If it
|
|
isn't set assume that this is a Ctrl-Z on its own and drop
|
|
through to check for EOF.
|
|
*/
|
|
if (GetLastError()==ERROR_OPERATION_ABORTED) {
|
|
HANDLE hInterruptEvent = _PyOS_SigintEvent();
|
|
switch (WaitForSingleObjectEx(hInterruptEvent, 10, FALSE)) {
|
|
case WAIT_OBJECT_0:
|
|
ResetEvent(hInterruptEvent);
|
|
return 1; /* Interrupt */
|
|
case WAIT_FAILED:
|
|
return -2; /* Error */
|
|
}
|
|
}
|
|
#endif /* MS_WINDOWS */
|
|
|
|
if (feof(fp)) {
|
|
clearerr(fp);
|
|
return -1; /* EOF */
|
|
}
|
|
|
|
#ifdef EINTR
|
|
if (err == EINTR) {
|
|
PyEval_RestoreThread(tstate);
|
|
int s = PyErr_CheckSignals();
|
|
PyEval_SaveThread();
|
|
|
|
if (s < 0) {
|
|
return 1;
|
|
}
|
|
/* try again */
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
if (_PyOS_InterruptOccurred(tstate)) {
|
|
return 1; /* Interrupt */
|
|
}
|
|
return -2; /* Error */
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#ifdef MS_WINDOWS
|
|
/* Readline implementation using ReadConsoleW */
|
|
|
|
extern char _get_console_type(HANDLE handle);
|
|
|
|
char *
|
|
_PyOS_WindowsConsoleReadline(PyThreadState *tstate, HANDLE hStdIn)
|
|
{
|
|
static wchar_t wbuf_local[1024 * 16];
|
|
const DWORD chunk_size = 1024;
|
|
|
|
DWORD n_read, total_read, wbuflen, u8len;
|
|
wchar_t *wbuf;
|
|
char *buf = NULL;
|
|
int err = 0;
|
|
|
|
n_read = (DWORD)-1;
|
|
total_read = 0;
|
|
wbuf = wbuf_local;
|
|
wbuflen = sizeof(wbuf_local) / sizeof(wbuf_local[0]) - 1;
|
|
while (1) {
|
|
if (PyOS_InputHook != NULL) {
|
|
(void)(PyOS_InputHook)();
|
|
}
|
|
if (!ReadConsoleW(hStdIn, &wbuf[total_read], wbuflen - total_read, &n_read, NULL)) {
|
|
err = GetLastError();
|
|
goto exit;
|
|
}
|
|
if (n_read == (DWORD)-1 && (err = GetLastError()) == ERROR_OPERATION_ABORTED) {
|
|
break;
|
|
}
|
|
if (n_read == 0) {
|
|
int s;
|
|
err = GetLastError();
|
|
if (err != ERROR_OPERATION_ABORTED)
|
|
goto exit;
|
|
err = 0;
|
|
HANDLE hInterruptEvent = _PyOS_SigintEvent();
|
|
if (WaitForSingleObjectEx(hInterruptEvent, 100, FALSE)
|
|
== WAIT_OBJECT_0) {
|
|
ResetEvent(hInterruptEvent);
|
|
PyEval_RestoreThread(tstate);
|
|
s = PyErr_CheckSignals();
|
|
PyEval_SaveThread();
|
|
if (s < 0) {
|
|
goto exit;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
total_read += n_read;
|
|
if (total_read == 0 || wbuf[total_read - 1] == L'\n') {
|
|
break;
|
|
}
|
|
wbuflen += chunk_size;
|
|
if (wbuf == wbuf_local) {
|
|
wbuf[total_read] = '\0';
|
|
wbuf = (wchar_t*)PyMem_RawMalloc(wbuflen * sizeof(wchar_t));
|
|
if (wbuf) {
|
|
wcscpy_s(wbuf, wbuflen, wbuf_local);
|
|
}
|
|
else {
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_NoMemory();
|
|
PyEval_SaveThread();
|
|
goto exit;
|
|
}
|
|
}
|
|
else {
|
|
wchar_t *tmp = PyMem_RawRealloc(wbuf, wbuflen * sizeof(wchar_t));
|
|
if (tmp == NULL) {
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_NoMemory();
|
|
PyEval_SaveThread();
|
|
goto exit;
|
|
}
|
|
wbuf = tmp;
|
|
}
|
|
}
|
|
|
|
if (wbuf[0] == '\x1a') {
|
|
buf = PyMem_RawMalloc(1);
|
|
if (buf) {
|
|
buf[0] = '\0';
|
|
}
|
|
else {
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_NoMemory();
|
|
PyEval_SaveThread();
|
|
}
|
|
goto exit;
|
|
}
|
|
|
|
u8len = WideCharToMultiByte(CP_UTF8, 0,
|
|
wbuf, total_read,
|
|
NULL, 0,
|
|
NULL, NULL);
|
|
buf = PyMem_RawMalloc(u8len + 1);
|
|
if (buf == NULL) {
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_NoMemory();
|
|
PyEval_SaveThread();
|
|
goto exit;
|
|
}
|
|
|
|
u8len = WideCharToMultiByte(CP_UTF8, 0,
|
|
wbuf, total_read,
|
|
buf, u8len,
|
|
NULL, NULL);
|
|
buf[u8len] = '\0';
|
|
|
|
exit:
|
|
if (wbuf != wbuf_local) {
|
|
PyMem_RawFree(wbuf);
|
|
}
|
|
|
|
if (err) {
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_SetFromWindowsErr(err);
|
|
PyEval_SaveThread();
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
/* Readline implementation using fgets() */
|
|
|
|
char *
|
|
PyOS_StdioReadline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
|
|
{
|
|
size_t n;
|
|
char *p, *pr;
|
|
PyThreadState *tstate = _PyOS_ReadlineTState;
|
|
assert(tstate != NULL);
|
|
|
|
#ifdef MS_WINDOWS
|
|
if (!Py_LegacyWindowsStdioFlag && sys_stdin == stdin) {
|
|
HANDLE hStdIn, hStdErr;
|
|
|
|
_Py_BEGIN_SUPPRESS_IPH
|
|
hStdIn = (HANDLE)_get_osfhandle(fileno(sys_stdin));
|
|
hStdErr = (HANDLE)_get_osfhandle(fileno(stderr));
|
|
_Py_END_SUPPRESS_IPH
|
|
|
|
if (_get_console_type(hStdIn) == 'r') {
|
|
fflush(sys_stdout);
|
|
if (prompt) {
|
|
if (_get_console_type(hStdErr) == 'w') {
|
|
wchar_t *wbuf;
|
|
int wlen;
|
|
wlen = MultiByteToWideChar(CP_UTF8, 0, prompt, -1,
|
|
NULL, 0);
|
|
if (wlen) {
|
|
wbuf = PyMem_RawMalloc(wlen * sizeof(wchar_t));
|
|
if (wbuf == NULL) {
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_NoMemory();
|
|
PyEval_SaveThread();
|
|
return NULL;
|
|
}
|
|
wlen = MultiByteToWideChar(CP_UTF8, 0, prompt, -1,
|
|
wbuf, wlen);
|
|
if (wlen) {
|
|
DWORD n;
|
|
fflush(stderr);
|
|
/* wlen includes null terminator, so subtract 1 */
|
|
WriteConsoleW(hStdErr, wbuf, wlen - 1, &n, NULL);
|
|
}
|
|
PyMem_RawFree(wbuf);
|
|
}
|
|
} else {
|
|
fprintf(stderr, "%s", prompt);
|
|
fflush(stderr);
|
|
}
|
|
}
|
|
clearerr(sys_stdin);
|
|
return _PyOS_WindowsConsoleReadline(tstate, hStdIn);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
fflush(sys_stdout);
|
|
if (prompt) {
|
|
fprintf(stderr, "%s", prompt);
|
|
}
|
|
fflush(stderr);
|
|
|
|
n = 0;
|
|
p = NULL;
|
|
do {
|
|
size_t incr = (n > 0) ? n + 2 : 100;
|
|
if (incr > INT_MAX) {
|
|
PyMem_RawFree(p);
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_SetString(PyExc_OverflowError, "input line too long");
|
|
PyEval_SaveThread();
|
|
return NULL;
|
|
}
|
|
pr = (char *)PyMem_RawRealloc(p, n + incr);
|
|
if (pr == NULL) {
|
|
PyMem_RawFree(p);
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_NoMemory();
|
|
PyEval_SaveThread();
|
|
return NULL;
|
|
}
|
|
p = pr;
|
|
int err = my_fgets(tstate, p + n, (int)incr, sys_stdin);
|
|
if (err == 1) {
|
|
// Interrupt
|
|
PyMem_RawFree(p);
|
|
return NULL;
|
|
} else if (err != 0) {
|
|
// EOF or error
|
|
p[n] = '\0';
|
|
break;
|
|
}
|
|
n += strlen(p + n);
|
|
} while (p[n-1] != '\n');
|
|
|
|
pr = (char *)PyMem_RawRealloc(p, n+1);
|
|
if (pr == NULL) {
|
|
PyMem_RawFree(p);
|
|
PyEval_RestoreThread(tstate);
|
|
PyErr_NoMemory();
|
|
PyEval_SaveThread();
|
|
return NULL;
|
|
}
|
|
return pr;
|
|
}
|
|
|
|
|
|
/* By initializing this function pointer, systems embedding Python can
|
|
override the readline function.
|
|
|
|
Note: Python expects in return a buffer allocated with PyMem_Malloc. */
|
|
|
|
char *(*PyOS_ReadlineFunctionPointer)(FILE *, FILE *, const char *) = NULL;
|
|
|
|
|
|
/* Interface used by tokenizer.c and bltinmodule.c */
|
|
|
|
char *
|
|
PyOS_Readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
|
|
{
|
|
char *rv, *res;
|
|
size_t len;
|
|
|
|
PyThreadState *tstate = _PyThreadState_GET();
|
|
if (_PyOS_ReadlineTState == tstate) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"can't re-enter readline");
|
|
return NULL;
|
|
}
|
|
|
|
|
|
if (PyOS_ReadlineFunctionPointer == NULL) {
|
|
PyOS_ReadlineFunctionPointer = PyOS_StdioReadline;
|
|
}
|
|
|
|
if (_PyOS_ReadlineLock == NULL) {
|
|
_PyOS_ReadlineLock = PyThread_allocate_lock();
|
|
if (_PyOS_ReadlineLock == NULL) {
|
|
PyErr_SetString(PyExc_MemoryError, "can't allocate lock");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
_PyOS_ReadlineTState = tstate;
|
|
Py_BEGIN_ALLOW_THREADS
|
|
PyThread_acquire_lock(_PyOS_ReadlineLock, 1);
|
|
|
|
/* This is needed to handle the unlikely case that the
|
|
* interpreter is in interactive mode *and* stdin/out are not
|
|
* a tty. This can happen, for example if python is run like
|
|
* this: python -i < test1.py
|
|
*/
|
|
if (!isatty (fileno (sys_stdin)) || !isatty (fileno (sys_stdout)))
|
|
rv = PyOS_StdioReadline (sys_stdin, sys_stdout, prompt);
|
|
else
|
|
rv = (*PyOS_ReadlineFunctionPointer)(sys_stdin, sys_stdout,
|
|
prompt);
|
|
Py_END_ALLOW_THREADS
|
|
|
|
PyThread_release_lock(_PyOS_ReadlineLock);
|
|
|
|
_PyOS_ReadlineTState = NULL;
|
|
|
|
if (rv == NULL)
|
|
return NULL;
|
|
|
|
len = strlen(rv) + 1;
|
|
res = PyMem_Malloc(len);
|
|
if (res != NULL) {
|
|
memcpy(res, rv, len);
|
|
}
|
|
else {
|
|
PyErr_NoMemory();
|
|
}
|
|
PyMem_RawFree(rv);
|
|
|
|
return res;
|
|
}
|