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037bbc8e YPK |
1 | /* Readline support for Python. |
2 | ||
3 | Copyright (C) 2012 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "python-internal.h" | |
22 | #include "exceptions.h" | |
23 | #include "top.h" | |
24 | #include "cli/cli-utils.h" | |
25 | #include "gdb_string.h" | |
26 | ||
27 | #include <stddef.h> | |
28 | ||
29 | /* Readline function suitable for PyOS_ReadlineFunctionPointer, which | |
30 | is used for Python's interactive parser and raw_input. In both | |
31 | cases, sys_stdin and sys_stdout are always stdin and stdout | |
32 | respectively, as far as I can tell; they are ignored and | |
33 | command_line_input is used instead. */ | |
34 | ||
35 | static char * | |
36 | gdbpy_readline_wrapper (FILE *sys_stdin, FILE *sys_stdout, | |
37 | char *prompt) | |
38 | { | |
39 | int n; | |
40 | char *p = NULL, *p_start, *p_end, *q; | |
41 | volatile struct gdb_exception except; | |
42 | ||
43 | TRY_CATCH (except, RETURN_MASK_ALL) | |
44 | p = command_line_input (prompt, 0, "python"); | |
45 | ||
46 | /* Detect user interrupt (Ctrl-C). */ | |
47 | if (except.reason == RETURN_QUIT) | |
48 | return NULL; | |
49 | ||
50 | /* Handle errors by raising Python exceptions. */ | |
51 | if (except.reason < 0) | |
52 | { | |
53 | /* The thread state is nulled during gdbpy_readline_wrapper, | |
54 | with the original value saved in the following undocumented | |
55 | variable (see Python's Parser/myreadline.c and | |
56 | Modules/readline.c). */ | |
57 | PyEval_RestoreThread (_PyOS_ReadlineTState); | |
58 | gdbpy_convert_exception (except); | |
59 | PyEval_SaveThread (); | |
60 | return NULL; | |
61 | } | |
62 | ||
63 | /* Detect EOF (Ctrl-D). */ | |
64 | if (p == NULL) | |
65 | { | |
66 | q = PyMem_Malloc (1); | |
67 | if (q != NULL) | |
68 | q[0] = '\0'; | |
69 | return q; | |
70 | } | |
71 | ||
72 | n = strlen (p); | |
73 | ||
74 | /* Copy the line to Python and return. */ | |
75 | q = PyMem_Malloc (n + 2); | |
76 | if (q != NULL) | |
77 | { | |
78 | strncpy (q, p, n); | |
79 | q[n] = '\n'; | |
80 | q[n + 1] = '\0'; | |
81 | } | |
82 | return q; | |
83 | } | |
84 | ||
85 | /* Initialize Python readline support. */ | |
86 | ||
87 | void | |
88 | gdbpy_initialize_gdb_readline (void) | |
89 | { | |
90 | /* Python's readline module conflicts with GDB's use of readline | |
91 | since readline is not reentrant. Ideally, a reentrant wrapper to | |
92 | GDB's readline should be implemented to replace Python's readline | |
93 | and prevent conflicts. For now, this file implements a | |
94 | sys.meta_path finder that simply fails to import the readline | |
95 | module. */ | |
96 | PyRun_SimpleString ("\ | |
97 | import sys\n\ | |
98 | \n\ | |
99 | class GdbRemoveReadlineFinder:\n\ | |
100 | def find_module(self, fullname, path=None):\n\ | |
101 | if fullname == 'readline' and path is None:\n\ | |
102 | return self\n\ | |
103 | return None\n\ | |
104 | \n\ | |
105 | def load_module(self, fullname):\n\ | |
106 | raise ImportError('readline module disabled under GDB')\n\ | |
107 | \n\ | |
108 | sys.meta_path.append(GdbRemoveReadlineFinder())\n\ | |
109 | "); | |
110 | ||
111 | PyOS_ReadlineFunctionPointer = gdbpy_readline_wrapper; | |
112 | } | |
113 |