| 1 | /* Wide characters for gdb |
| 2 | Copyright (C) 2009-2016 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 */ |