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d57a3c85 TJB |
1 | /* General utility routines for GDB/Python. |
2 | ||
0fb0cc75 | 3 | Copyright (C) 2008, 2009 Free Software Foundation, Inc. |
d57a3c85 TJB |
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 "charset.h" | |
22 | #include "python-internal.h" | |
23 | ||
24 | ||
25 | /* This is a cleanup function which decrements the refcount on a | |
26 | Python object. */ | |
27 | ||
28 | static void | |
29 | py_decref (void *p) | |
30 | { | |
31 | PyObject *py = p; | |
32 | /* Note that we need the extra braces in this 'if' to avoid a | |
33 | warning from gcc. */ | |
34 | if (py) | |
35 | { | |
36 | Py_DECREF (py); | |
37 | } | |
38 | } | |
39 | ||
40 | /* Return a new cleanup which will decrement the Python object's | |
41 | refcount when run. */ | |
42 | ||
43 | struct cleanup * | |
44 | make_cleanup_py_decref (PyObject *py) | |
45 | { | |
46 | return make_cleanup (py_decref, (void *) py); | |
47 | } | |
48 | ||
49 | /* Converts a Python 8-bit string to a unicode string object. Assumes the | |
50 | 8-bit string is in the host charset. If an error occurs during conversion, | |
51 | returns NULL with a python exception set. | |
52 | ||
53 | As an added bonus, the functions accepts a unicode string and returns it | |
54 | right away, so callers don't need to check which kind of string they've | |
55 | got. | |
56 | ||
57 | If the given object is not one of the mentioned string types, NULL is | |
58 | returned, with the TypeError python exception set. */ | |
59 | PyObject * | |
60 | python_string_to_unicode (PyObject *obj) | |
61 | { | |
62 | PyObject *unicode_str; | |
63 | ||
64 | /* If obj is already a unicode string, just return it. | |
65 | I wish life was always that simple... */ | |
66 | if (PyUnicode_Check (obj)) | |
83390453 PM |
67 | { |
68 | unicode_str = obj; | |
69 | Py_INCREF (obj); | |
70 | } | |
71 | ||
d57a3c85 TJB |
72 | else if (PyString_Check (obj)) |
73 | unicode_str = PyUnicode_FromEncodedObject (obj, host_charset (), NULL); | |
74 | else | |
75 | { | |
76 | PyErr_SetString (PyExc_TypeError, | |
77 | _("Expected a string or unicode object.")); | |
78 | unicode_str = NULL; | |
79 | } | |
80 | ||
81 | return unicode_str; | |
82 | } | |
83 | ||
84 | /* Returns a newly allocated string with the contents of the given unicode | |
08c637de TJB |
85 | string object converted to CHARSET. If an error occurs during the |
86 | conversion, NULL will be returned and a python exception will be set. | |
d57a3c85 TJB |
87 | |
88 | The caller is responsible for xfree'ing the string. */ | |
08c637de TJB |
89 | static char * |
90 | unicode_to_encoded_string (PyObject *unicode_str, const char *charset) | |
d57a3c85 | 91 | { |
08c637de | 92 | char *result; |
d57a3c85 TJB |
93 | PyObject *string; |
94 | ||
08c637de TJB |
95 | /* Translate string to named charset. */ |
96 | string = PyUnicode_AsEncodedString (unicode_str, charset, NULL); | |
d57a3c85 TJB |
97 | if (string == NULL) |
98 | return NULL; | |
99 | ||
08c637de | 100 | result = xstrdup (PyString_AsString (string)); |
d57a3c85 TJB |
101 | |
102 | Py_DECREF (string); | |
103 | ||
08c637de TJB |
104 | return result; |
105 | } | |
106 | ||
107 | /* Returns a newly allocated string with the contents of the given unicode | |
108 | string object converted to the target's charset. If an error occurs during | |
109 | the conversion, NULL will be returned and a python exception will be set. | |
110 | ||
111 | The caller is responsible for xfree'ing the string. */ | |
112 | char * | |
113 | unicode_to_target_string (PyObject *unicode_str) | |
114 | { | |
115 | return unicode_to_encoded_string (unicode_str, target_charset ()); | |
d57a3c85 TJB |
116 | } |
117 | ||
118 | /* Converts a python string (8-bit or unicode) to a target string in | |
119 | the target's charset. Returns NULL on error, with a python exception set. | |
120 | ||
121 | The caller is responsible for xfree'ing the string. */ | |
122 | char * | |
123 | python_string_to_target_string (PyObject *obj) | |
124 | { | |
125 | PyObject *str; | |
83390453 | 126 | char *result; |
d57a3c85 TJB |
127 | |
128 | str = python_string_to_unicode (obj); | |
129 | if (str == NULL) | |
130 | return NULL; | |
131 | ||
83390453 PM |
132 | result = unicode_to_target_string (str); |
133 | Py_DECREF (str); | |
134 | return result; | |
d57a3c85 | 135 | } |
08c637de TJB |
136 | |
137 | /* Converts a python string (8-bit or unicode) to a target string in | |
138 | the host's charset. Returns NULL on error, with a python exception set. | |
139 | ||
140 | The caller is responsible for xfree'ing the string. */ | |
141 | char * | |
142 | python_string_to_host_string (PyObject *obj) | |
143 | { | |
144 | PyObject *str; | |
83390453 | 145 | char *result; |
08c637de TJB |
146 | |
147 | str = python_string_to_unicode (obj); | |
148 | if (str == NULL) | |
149 | return NULL; | |
150 | ||
83390453 PM |
151 | result = unicode_to_encoded_string (str, host_charset ()); |
152 | Py_DECREF (str); | |
153 | return result; | |
08c637de TJB |
154 | } |
155 | ||
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156 | /* Converts a target string of LENGTH bytes in the target's charset to a |
157 | Python Unicode string. If LENGTH is -1, convert until a null byte is found. | |
158 | ||
159 | Returns NULL on error, with a python exception set. */ | |
160 | PyObject * | |
161 | target_string_to_unicode (const gdb_byte *str, int length) | |
162 | { | |
163 | if (length == -1) | |
164 | length = strlen (str); | |
165 | ||
166 | return PyUnicode_Decode (str, length, target_charset (), NULL); | |
167 | } | |
168 | ||
08c637de TJB |
169 | /* Return true if OBJ is a Python string or unicode object, false |
170 | otherwise. */ | |
171 | ||
172 | int | |
173 | gdbpy_is_string (PyObject *obj) | |
174 | { | |
175 | return PyString_Check (obj) || PyUnicode_Check (obj); | |
176 | } |