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125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
/* Wide characters for gdb
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Copyright (C) 2009-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDB_WCHAR_H
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#define GDB_WCHAR_H
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/* We handle three different modes here.
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Capable systems have the full suite: wchar_t support and iconv
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(perhaps via GNU libiconv). On these machines, full functionality
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is available. Note that full functionality is dependent on us
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being able to convert from an arbitrary encoding to wchar_t. In
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practice this means we look for __STDC_ISO_10646__ (where we know
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the name of the wchar_t encoding) or GNU libiconv, where we can use
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"wchar_t".
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DJGPP is known to have libiconv but not wchar_t support. On
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systems like this, we use the narrow character functions. The full
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functionality is available to the user, but many characters (those
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outside the narrow range) will be displayed as escapes.
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Finally, some systems do not have iconv, or are really broken
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(e.g., Solaris, which almost has all of this working, but where
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just enough is broken to make it too hard to use). Here we provide
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a phony iconv which only handles a single character set, and we
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provide wrappers for the wchar_t functionality we use. */
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#if defined (HAVE_ICONV)
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#include <iconv.h>
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#else
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/* This define is used elsewhere so we don't need to duplicate the
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same checking logic in multiple places. */
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#define PHONY_ICONV
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#endif
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#include <wchar.h>
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#include <wctype.h>
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/* We use "btowc" as a sentinel to detect functioning wchar_t support.
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We check for either __STDC_ISO_10646__ or a new-enough libiconv in
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order to ensure we can convert to and from wchar_t. We choose
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libiconv version 0x108 because it is the first version with
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iconvlist. */
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#if defined (HAVE_ICONV) && defined (HAVE_BTOWC) \
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&& (defined (__STDC_ISO_10646__) \
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|| (defined (_LIBICONV_VERSION) && _LIBICONV_VERSION >= 0x108))
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typedef wchar_t gdb_wchar_t;
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typedef wint_t gdb_wint_t;
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#define gdb_wcslen wcslen
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#define gdb_iswprint iswprint
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#define gdb_iswdigit iswdigit
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#define gdb_btowc btowc
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#define gdb_WEOF WEOF
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#define LCST(X) L ## X
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/* If __STDC_ISO_10646__ is defined, then the host wchar_t is UCS-4.
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We exploit this fact in the hope that there are hosts that define
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this but which do not support "wchar_t" as an encoding argument to
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iconv_open. We put the endianness into the encoding name to avoid
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hosts that emit a BOM when the unadorned name is used. */
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#if defined (__STDC_ISO_10646__)
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#define USE_INTERMEDIATE_ENCODING_FUNCTION
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#define INTERMEDIATE_ENCODING intermediate_encoding ()
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const char *intermediate_encoding (void);
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#elif defined (_LIBICONV_VERSION) && _LIBICONV_VERSION >= 0x108
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#define INTERMEDIATE_ENCODING "wchar_t"
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#else
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/* This shouldn't happen, because the earlier #if should have filtered
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out this case. */
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#error "Neither __STDC_ISO_10646__ nor _LIBICONV_VERSION defined"
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#endif
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#else
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/* If we got here and have wchar_t support, we might be on a system
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with some problem. So, we just disable everything. */
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#if defined (HAVE_BTOWC)
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#define PHONY_ICONV
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#endif
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typedef char gdb_wchar_t;
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typedef int gdb_wint_t;
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#define gdb_wcslen strlen
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#define gdb_iswprint isprint
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#define gdb_iswdigit isdigit
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#define gdb_btowc /* empty */
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#define gdb_WEOF EOF
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#define LCST(X) X
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/* If we are using the narrow character set, we want to use the host
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narrow encoding as our intermediate encoding. However, if we are
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also providing a phony iconv, we might as well just stick with
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"wchar_t". */
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#ifdef PHONY_ICONV
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#define INTERMEDIATE_ENCODING "wchar_t"
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#else
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#define INTERMEDIATE_ENCODING host_charset ()
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#endif
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#endif
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#endif /* GDB_WCHAR_H */
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