summaryrefslogtreecommitdiff
path: root/readline/nls.c
blob: e3599eb76f4295f3f8327632cee4c35170c2a1e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
/* nls.c -- skeletal internationalization code. */

/* Copyright (C) 1996-2009 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library (Readline), a library
   for reading lines of text with interactive input and history editing.      

   Readline 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.

   Readline 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 Readline.  If not, see <http://www.gnu.org/licenses/>.
*/

#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)
#  include <config.h>
#endif

#include <sys/types.h>

#include <stdio.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif /* HAVE_UNISTD_H */

#if defined (HAVE_STDLIB_H)
#  include <stdlib.h>
#else
#  include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */

#if defined (HAVE_LOCALE_H)
#  include <locale.h>
#endif

#include <ctype.h>

#include "rldefs.h"
#include "readline.h"
#include "rlshell.h"
#include "rlprivate.h"

#if !defined (HAVE_SETLOCALE)    
/* A list of legal values for the LANG or LC_CTYPE environment variables.
   If a locale name in this list is the value for the LC_ALL, LC_CTYPE,
   or LANG environment variable (using the first of those with a value),
   readline eight-bit mode is enabled. */
static char *legal_lang_values[] =
{
 "iso88591",
 "iso88592",
 "iso88593",
 "iso88594",
 "iso88595",
 "iso88596",
 "iso88597",
 "iso88598",
 "iso88599",
 "iso885910",
 "koi8r",
  0
};

static char *normalize_codeset PARAMS((char *));
static char *find_codeset PARAMS((char *, size_t *));
#endif /* !HAVE_SETLOCALE */

static char *_rl_get_locale_var PARAMS((const char *));

static char *
_rl_get_locale_var (v)
     const char *v;
{
  char *lspec;

  lspec = sh_get_env_value ("LC_ALL");
  if (lspec == 0 || *lspec == 0)
    lspec = sh_get_env_value (v);
  if (lspec == 0 || *lspec == 0)
    lspec = sh_get_env_value ("LANG");

  return lspec;
}
  
/* Check for LC_ALL, LC_CTYPE, and LANG and use the first with a value
   to decide the defaults for 8-bit character input and output.  Returns
   1 if we set eight-bit mode. */
int
_rl_init_eightbit ()
{
/* If we have setlocale(3), just check the current LC_CTYPE category
   value, and go into eight-bit mode if it's not C or POSIX. */
#if defined (HAVE_SETLOCALE)
  char *lspec, *t;

  /* Set the LC_CTYPE locale category from environment variables. */
  lspec = _rl_get_locale_var ("LC_CTYPE");
  /* Since _rl_get_locale_var queries the right environment variables,
     we query the current locale settings with setlocale(), and, if
     that doesn't return anything, we set lspec to the empty string to
     force the subsequent call to setlocale() to define the `native'
     environment. */
  if (lspec == 0 || *lspec == 0)
    lspec = setlocale (LC_CTYPE, (char *)NULL);
  if (lspec == 0)
    lspec = "";
  t = setlocale (LC_CTYPE, lspec);

  if (t && *t && (t[0] != 'C' || t[1]) && (STREQ (t, "POSIX") == 0))
    {
      _rl_meta_flag = 1;
      _rl_convert_meta_chars_to_ascii = 0;
      _rl_output_meta_chars = 1;
      return (1);
    }
  else
    return (0);

#else /* !HAVE_SETLOCALE */
  char *lspec, *t;
  int i;

  /* We don't have setlocale.  Finesse it.  Check the environment for the
     appropriate variables and set eight-bit mode if they have the right
     values. */
  lspec = _rl_get_locale_var ("LC_CTYPE");

  if (lspec == 0 || (t = normalize_codeset (lspec)) == 0)
    return (0);
  for (i = 0; t && legal_lang_values[i]; i++)
    if (STREQ (t, legal_lang_values[i]))
      {
	_rl_meta_flag = 1;
	_rl_convert_meta_chars_to_ascii = 0;
	_rl_output_meta_chars = 1;
	break;
      }
  xfree (t);
  return (legal_lang_values[i] ? 1 : 0);

#endif /* !HAVE_SETLOCALE */
}

#if !defined (HAVE_SETLOCALE)
static char *
normalize_codeset (codeset)
     char *codeset;
{
  size_t namelen, i;
  int len, all_digits;
  char *wp, *retval;

  codeset = find_codeset (codeset, &namelen);

  if (codeset == 0)
    return (codeset);

  all_digits = 1;
  for (len = 0, i = 0; i < namelen; i++)
    {
      if (ISALNUM ((unsigned char)codeset[i]))
	{
	  len++;
	  all_digits &= _rl_digit_p (codeset[i]);
	}
    }

  retval = (char *)malloc ((all_digits ? 3 : 0) + len + 1);
  if (retval == 0)
    return ((char *)0);

  wp = retval;
  /* Add `iso' to beginning of an all-digit codeset */
  if (all_digits)
    {
      *wp++ = 'i';
      *wp++ = 's';
      *wp++ = 'o';
    }

  for (i = 0; i < namelen; i++)
    if (ISALPHA ((unsigned char)codeset[i]))
      *wp++ = _rl_to_lower (codeset[i]);
    else if (_rl_digit_p (codeset[i]))
      *wp++ = codeset[i];
  *wp = '\0';

  return retval;
}

/* Isolate codeset portion of locale specification. */
static char *
find_codeset (name, lenp)
     char *name;
     size_t *lenp;
{
  char *cp, *language, *result;

  cp = language = name;
  result = (char *)0;

  while (*cp && *cp != '_' && *cp != '@' && *cp != '+' && *cp != ',')
    cp++;

  /* This does not make sense: language has to be specified.  As
     an exception we allow the variable to contain only the codeset
     name.  Perhaps there are funny codeset names.  */
  if (language == cp) 
    {
      *lenp = strlen (language);
      result = language;
    }
  else
    {
      /* Next is the territory. */
      if (*cp == '_')
	do
	  ++cp;
	while (*cp && *cp != '.' && *cp != '@' && *cp != '+' && *cp != ',' && *cp != '_');

      /* Now, finally, is the codeset. */
      result = cp;
      if (*cp == '.')
	do
	  ++cp;
	while (*cp && *cp != '@');

      if (cp - result > 2)
	{
	  result++;
	  *lenp = cp - result;
	}
      else
	{
	  *lenp = strlen (language);
	  result = language;
	}
    }

  return result;
}
#endif /* !HAVE_SETLOCALE */