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/* Character set conversion support for GDB.
Copyright (C) 2001, 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef CHARSET_H
#define CHARSET_H
/* If the target program uses a different character set than the host,
GDB has some support for translating between the two; GDB converts
characters and strings to the host character set before displaying
them, and converts characters and strings appearing in expressions
entered by the user to the target character set.
At the moment, GDB only supports single-byte, stateless character
sets. This includes the ISO-8859 family (ASCII extended with
accented characters, and (I think) Cyrillic, for European
languages), and the EBCDIC family (used on IBM's mainframes).
Unfortunately, it excludes many Asian scripts, the fixed- and
variable-width Unicode encodings, and other desireable things.
Patches are welcome! (For example, it would be nice if the Java
string support could simply get absorbed into some more general
multi-byte encoding support.)
Furthermore, GDB's code pretty much assumes that the host character
set is some superset of ASCII; there are plenty if ('0' + n)
expressions and the like.
When the `iconv' library routine supports a character set meeting
the requirements above, it's easy to plug an entry into GDB's table
that uses iconv to handle the details. */
/* Return the name of the current host/target character set. The
result is owned by the charset module; the caller should not free
it. */
const char *host_charset (void);
const char *target_charset (void);
/* In general, the set of C backslash escapes (\n, \f) is specific to
the character set. Not all character sets will have form feed
characters, for example.
The following functions allow GDB to parse and print control
characters in a character-set-independent way. They are both
language-specific (to C and C++) and character-set-specific.
Putting them here is a compromise. */
/* If the target character TARGET_CHAR have a backslash escape in the
C language (i.e., a character like 'n' or 't'), return the host
character string that should follow the backslash. Otherwise,
return zero.
When this function returns non-zero, the string it returns is
statically allocated; the caller is not responsible for freeing it. */
const char *c_target_char_has_backslash_escape (int target_char);
/* If the host character HOST_CHAR is a valid backslash escape in the
C language for the target character set, return non-zero, and set
*TARGET_CHAR to the target character the backslash escape represents.
Otherwise, return zero. */
int c_parse_backslash (int host_char, int *target_char);
/* Return non-zero if the host character HOST_CHAR can be printed
literally --- that is, if it can be readably printed as itself in a
character or string constant. Return zero if it should be printed
using some kind of numeric escape, like '\031' in C, '^(25)' in
Chill, or #25 in Pascal. */
int host_char_print_literally (int host_char);
/* If the host character HOST_CHAR has an equivalent in the target
character set, set *TARGET_CHAR to that equivalent, and return
non-zero. Otherwise, return zero. */
int host_char_to_target (int host_char, int *target_char);
/* If the target character TARGET_CHAR has an equivalent in the host
character set, set *HOST_CHAR to that equivalent, and return
non-zero. Otherwise, return zero. */
int target_char_to_host (int target_char, int *host_char);
/* If the target character TARGET_CHAR has a corresponding control
character (also in the target character set), set *TARGET_CTRL_CHAR
to the control character, and return non-zero. Otherwise, return
zero. */
int target_char_to_control_char (int target_char, int *target_ctrl_char);
#endif /* CHARSET_H */
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