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/tmp/gdb-8.1/gdb/gdb_wchar.h
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1 /* Wide characters for gdb
2 Copyright (C) 2009-2018 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
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.
10
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.
15
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/>. */
18
19 #ifndef GDB_WCHAR_H
20 #define GDB_WCHAR_H
21
22 /* We handle three different modes here.
23
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
30 "wchar_t".
31
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.
36
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. */
42
43
44 #if defined (HAVE_ICONV)
45 #include <iconv.h>
46 #else
47 /* This define is used elsewhere so we don't need to duplicate the
48 same checking logic in multiple places. */
49 #define PHONY_ICONV
50 #endif
51
52 #include <wchar.h>
53 #include <wctype.h>
54
55 /* We use "btowc" as a sentinel to detect functioning wchar_t support.
56 We check for either __STDC_ISO_10646__ or a new-enough libiconv in
57 order to ensure we can convert to and from wchar_t. We choose
58 libiconv version 0x108 because it is the first version with
59 iconvlist. */
60 #if defined (HAVE_ICONV) && defined (HAVE_BTOWC) \
61 && (defined (__STDC_ISO_10646__) \
62 || (defined (_LIBICONV_VERSION) && _LIBICONV_VERSION >= 0x108))
63
64 typedef wchar_t gdb_wchar_t;
65 typedef wint_t gdb_wint_t;
66
67 #define gdb_wcslen wcslen
68 #define gdb_iswprint iswprint
69 #define gdb_iswdigit iswdigit
70 #define gdb_btowc btowc
71 #define gdb_WEOF WEOF
72
73 #define LCST(X) L ## X
74
75 /* If __STDC_ISO_10646__ is defined, then the host wchar_t is UCS-4.
76 We exploit this fact in the hope that there are hosts that define
77 this but which do not support "wchar_t" as an encoding argument to
78 iconv_open. We put the endianness into the encoding name to avoid
79 hosts that emit a BOM when the unadorned name is used. */
80 #if defined (__STDC_ISO_10646__)
81 #define USE_INTERMEDIATE_ENCODING_FUNCTION
82 #define INTERMEDIATE_ENCODING intermediate_encoding ()
83 const char *intermediate_encoding (void);
84
85 #elif defined (_LIBICONV_VERSION) && _LIBICONV_VERSION >= 0x108
86 #define INTERMEDIATE_ENCODING "wchar_t"
87 #else
88 /* This shouldn't happen, because the earlier #if should have filtered
89 out this case. */
90 #error "Neither __STDC_ISO_10646__ nor _LIBICONV_VERSION defined"
91 #endif
92
93 #else
94
95 /* If we got here and have wchar_t support, we might be on a system
96 with some problem. So, we just disable everything. */
97 #if defined (HAVE_BTOWC)
98 #define PHONY_ICONV
99 #endif
100
101 typedef char gdb_wchar_t;
102 typedef int gdb_wint_t;
103
104 #define gdb_wcslen strlen
105 #define gdb_iswprint isprint
106 #define gdb_iswdigit isdigit
107 #define gdb_btowc /* empty */
108 #define gdb_WEOF EOF
109
110 #define LCST(X) X
111
112 /* If we are using the narrow character set, we want to use the host
113 narrow encoding as our intermediate encoding. However, if we are
114 also providing a phony iconv, we might as well just stick with
115 "wchar_t". */
116 #ifdef PHONY_ICONV
117 #define INTERMEDIATE_ENCODING "wchar_t"
118 #else
119 #define INTERMEDIATE_ENCODING host_charset ()
120 #endif
121
122 #endif
123
124 #endif /* GDB_WCHAR_H */
gdb_wint_t
int gdb_wint_t
Definition: gdb_wchar.h:102
gdb_wchar_t
char gdb_wchar_t
Definition: gdb_wchar.h:101