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112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/* Readline support for Python.
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Copyright (C) 2012-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "python-internal.h"
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#include "top.h"
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#include "cli/cli-utils.h"
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/* Readline function suitable for PyOS_ReadlineFunctionPointer, which
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is used for Python's interactive parser and raw_input. In both
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cases, sys_stdin and sys_stdout are always stdin and stdout
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respectively, as far as I can tell; they are ignored and
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command_line_input is used instead. */
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static char *
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gdbpy_readline_wrapper (FILE *sys_stdin, FILE *sys_stdout,
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#if PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 4
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const char *prompt)
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#else
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char *prompt)
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#endif
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{
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int n;
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char *p = NULL, *q;
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volatile struct gdb_exception except;
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TRY_CATCH (except, RETURN_MASK_ALL)
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p = command_line_input (prompt, 0, "python");
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/* Detect user interrupt (Ctrl-C). */
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if (except.reason == RETURN_QUIT)
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return NULL;
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/* Handle errors by raising Python exceptions. */
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if (except.reason < 0)
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{
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/* The thread state is nulled during gdbpy_readline_wrapper,
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with the original value saved in the following undocumented
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variable (see Python's Parser/myreadline.c and
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Modules/readline.c). */
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PyEval_RestoreThread (_PyOS_ReadlineTState);
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gdbpy_convert_exception (except);
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PyEval_SaveThread ();
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return NULL;
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}
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/* Detect EOF (Ctrl-D). */
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if (p == NULL)
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{
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q = PyMem_Malloc (1);
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if (q != NULL)
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q[0] = '\0';
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return q;
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}
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n = strlen (p);
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/* Copy the line to Python and return. */
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q = PyMem_Malloc (n + 2);
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if (q != NULL)
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{
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strncpy (q, p, n);
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q[n] = '\n';
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q[n + 1] = '\0';
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}
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return q;
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}
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/* Initialize Python readline support. */
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void
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gdbpy_initialize_gdb_readline (void)
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{
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/* Python's readline module conflicts with GDB's use of readline
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since readline is not reentrant. Ideally, a reentrant wrapper to
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GDB's readline should be implemented to replace Python's readline
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and prevent conflicts. For now, this file implements a
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sys.meta_path finder that simply fails to import the readline
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module. */
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if (PyRun_SimpleString ("\
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import sys\n\
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\n\
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class GdbRemoveReadlineFinder:\n\
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def find_module(self, fullname, path=None):\n\
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if fullname == 'readline' and path is None:\n\
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return self\n\
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return None\n\
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\n\
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def load_module(self, fullname):\n\
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raise ImportError('readline module disabled under GDB')\n\
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\n\
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sys.meta_path.append(GdbRemoveReadlineFinder())\n\
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") == 0)
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PyOS_ReadlineFunctionPointer = gdbpy_readline_wrapper;
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}
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