1 /* Character set conversion support for GDB.
2 Copyright 2001 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 2 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, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
25 /* If the target program uses a different character set than the host,
26 GDB has some support for translating between the two; GDB converts
27 characters and strings to the host character set before displaying
28 them, and converts characters and strings appearing in expressions
29 entered by the user to the target character set.
31 At the moment, GDB only supports single-byte, stateless character
32 sets. This includes the ISO-8859 family (ASCII extended with
33 accented characters, and (I think) Cyrillic, for European
34 languages), and the EBCDIC family (used on IBM's mainframes).
35 Unfortunately, it excludes many Asian scripts, the fixed- and
36 variable-width Unicode encodings, and other desireable things.
37 Patches are welcome! (For example, it would be nice if the Java
38 string support could simply get absorbed into some more general
39 multi-byte encoding support.)
41 Furthermore, GDB's code pretty much assumes that the host character
42 set is some superset of ASCII; there are plenty if ('0' + n)
43 expressions and the like.
45 When the `iconv' library routine supports a character set meeting
46 the requirements above, it's easy to plug an entry into GDB's table
47 that uses iconv to handle the details. */
50 /* Set the host character set to CHARSET. CHARSET must be a superset
51 of ASCII, since GDB's code assumes this. */
52 void set_host_charset (const char *charset
);
55 /* Set the target character set to CHARSET. */
56 void set_target_charset (const char *charset
);
59 /* Return the name of the current host/target character set. The
60 result is owned by the charset module; the caller should not free
62 const char *host_charset (void);
63 const char *target_charset (void);
66 /* In general, the set of C backslash escapes (\n, \f) is specific to
67 the character set. Not all character sets will have form feed
68 characters, for example.
70 The following functions allow GDB to parse and print control
71 characters in a character-set-independent way. They are both
72 language-specific (to C and C++) and character-set-specific.
73 Putting them here is a compromise. */
76 /* If the target character TARGET_CHAR have a backslash escape in the
77 C language (i.e., a character like 'n' or 't'), return the host
78 character string that should follow the backslash. Otherwise,
81 When this function returns non-zero, the string it returns is
82 statically allocated; the caller is not responsible for freeing it. */
83 const char *c_target_char_has_backslash_escape (int target_char
);
86 /* If the host character HOST_CHAR is a valid backslash escape in the
87 C language for the target character set, return non-zero, and set
88 *TARGET_CHAR to the target character the backslash escape represents.
89 Otherwise, return zero. */
90 int c_parse_backslash (int host_char
, int *target_char
);
93 /* Return non-zero if the host character HOST_CHAR can be printed
94 literally --- that is, if it can be readably printed as itself in a
95 character or string constant. Return zero if it should be printed
96 using some kind of numeric escape, like '\031' in C, '^(25)' in
97 Chill, or #25 in Pascal. */
98 int host_char_print_literally (int host_char
);
101 /* If the host character HOST_CHAR has an equivalent in the target
102 character set, set *TARGET_CHAR to that equivalent, and return
103 non-zero. Otherwise, return zero. */
104 int host_char_to_target (int host_char
, int *target_char
);
107 /* If the target character TARGET_CHAR has an equivalent in the host
108 character set, set *HOST_CHAR to that equivalent, and return
109 non-zero. Otherwise, return zero. */
110 int target_char_to_host (int target_char
, int *host_char
);
113 /* If the target character TARGET_CHAR has a corresponding control
114 character (also in the target character set), set *TARGET_CTRL_CHAR
115 to the control character, and return non-zero. Otherwise, return
117 int target_char_to_control_char (int target_char
, int *target_ctrl_char
);
120 #endif /* CHARSET_H */
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