1 /* Wide characters for gdb
2 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 /* We handle three different modes here.
24 Capable systems have the full suite: wchar_t support and iconv
25 (perhaps via GNU libiconv). On these machines, full functionality
26 is available. Note that full functionality is dependent on us
27 being able to convert from an arbitrary encoding to wchar_t. In
28 practice this means we look for __STDC_ISO_10646__ (where we know
29 the name of the wchar_t encoding) or GNU libiconv, where we can use
32 DJGPP is known to have libiconv but not wchar_t support. On
33 systems like this, we use the narrow character functions. The full
34 functionality is available to the user, but many characters (those
35 outside the narrow range) will be displayed as escapes.
37 Finally, some systems do not have iconv, or are really broken
38 (e.g., Solaris, which almost has all of this working, but where
39 just enough is broken to make it too hard to use). Here we provide
40 a phony iconv which only handles a single character set, and we
41 provide wrappers for the wchar_t functionality we use. */
44 #if defined (HAVE_ICONV)
47 /* This define is used elsewhere so we don't need to duplicate the
48 same checking logic in multiple places. */
52 /* We use "btowc" as a sentinel to detect functioning wchar_t support.
53 We check for either __STDC_ISO_10646__ or a new-enough libiconv in
54 order to ensure we can convert to and from wchar_t. We choose
55 libiconv version 0x10D because it was reported that earlier
56 versions do not always accept "wchar_t" as an encoding
58 #if defined (HAVE_ICONV) && defined (HAVE_WCHAR_H) && defined (HAVE_BTOWC) \
59 && (defined (__STDC_ISO_10646__) \
60 || (defined (_LIBICONV_VERSION) && _LIBICONV_VERSION >= 0x10D))
65 typedef wchar_t gdb_wchar_t
;
66 typedef wint_t gdb_wint_t
;
68 #define gdb_wcslen wcslen
69 #define gdb_iswprint iswprint
70 #define gdb_iswdigit iswdigit
71 #define gdb_btowc btowc
74 #define LCST(X) L ## X
76 /* If __STDC_ISO_10646__ is defined, then the host wchar_t is UCS-4.
77 We exploit this fact in the hope that there are hosts that define
78 this but which do not support "wchar_t" as an encoding argument to
79 iconv_open. We put the endianness into the encoding name to avoid
80 hosts that emit a BOM when the unadorned name is used. */
81 #if defined (__STDC_ISO_10646__)
83 #define INTERMEDIATE_ENCODING "UCS-4BE"
85 #define INTERMEDIATE_ENCODING "UCS-4LE"
87 #elif defined (_LIBICONV_VERSION) && _LIBICONV_VERSION >= 0x10D
88 #define INTERMEDIATE_ENCODING "wchar_t"
90 /* This shouldn't happen, because the earlier #if should have filtered
92 #error "Neither __STDC_ISO_10646__ nor _LIBICONV_VERSION defined"
97 /* If we got here and have wchar_t support, we might be on a system
98 with some problem. So, we just disable everything. */
99 #if defined (HAVE_WCHAR_H) && defined (HAVE_BTOWC)
103 typedef char gdb_wchar_t
;
104 typedef int gdb_wint_t
;
106 #define gdb_wcslen strlen
107 #define gdb_iswprint isprint
108 #define gdb_iswdigit isdigit
109 #define gdb_btowc /* empty */
114 /* If we are using the narrow character set, we want to use the host
115 narrow encoding as our intermediate encoding. However, if we are
116 also providing a phony iconv, we might as well just stick with
119 #define INTERMEDIATE_ENCODING "wchar_t"
121 #define INTERMEDIATE_ENCODING host_charset ()
126 #endif /* GDB_WCHAR_H */