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1 zoff99 2 /* Determine a canonical name for the current locale's character encoding.
2    
3     Copyright (C) 2000-2003 Free Software Foundation, Inc.
4    
5     This program is free software; you can redistribute it and/or modify it
6     under the terms of the GNU Library General Public License as published
7     by the Free Software Foundation; either version 2, or (at your option)
8     any later version.
9    
10     This program is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13     Library General Public License for more details.
14    
15     You should have received a copy of the GNU Library General Public
16     License along with this program; if not, write to the Free Software
17     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18     USA. */
19    
20     /* Written by Bruno Haible <bruno@clisp.org>. */
21    
22     #ifdef HAVE_CONFIG_H
23     # include <config.h>
24     #endif
25    
26     /* Specification. */
27     #include "localcharset.h"
28    
29     #if HAVE_STDDEF_H
30     # include <stddef.h>
31     #endif
32    
33     #include <stdio.h>
34     #if HAVE_STRING_H
35     # include <string.h>
36     #else
37     # include <strings.h>
38     #endif
39     #if HAVE_STDLIB_H
40     # include <stdlib.h>
41     #endif
42    
43     #if defined _WIN32 || defined __WIN32__
44     # undef WIN32 /* avoid warning on mingw32 */
45     # define WIN32
46     #endif
47    
48     #if defined __EMX__
49     /* Assume EMX program runs on OS/2, even if compiled under DOS. */
50     # define OS2
51     #endif
52    
53     #if !defined WIN32
54     # if HAVE_LANGINFO_CODESET
55     # include <langinfo.h>
56     # else
57     # if HAVE_SETLOCALE
58     # include <locale.h>
59     # endif
60     # endif
61     #elif defined WIN32
62     # define WIN32_LEAN_AND_MEAN
63     # include <windows.h>
64     #endif
65     #if defined OS2
66     # define INCL_DOS
67     # include <os2.h>
68     #endif
69    
70     #if ENABLE_RELOCATABLE
71     # include "relocatable.h"
72     #else
73     # define relocate(pathname) (pathname)
74     #endif
75    
76     #if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
77     /* Win32, OS/2, DOS */
78     # define ISSLASH(C) ((C) == '/' || (C) == '\\')
79     #endif
80    
81     #ifndef DIRECTORY_SEPARATOR
82     # define DIRECTORY_SEPARATOR '/'
83     #endif
84    
85     #ifndef ISSLASH
86     # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
87     #endif
88    
89     #if HAVE_DECL_GETC_UNLOCKED
90     # undef getc
91     # define getc getc_unlocked
92     #endif
93    
94     /* The following static variable is declared 'volatile' to avoid a
95     possible multithread problem in the function get_charset_aliases. If we
96     are running in a threaded environment, and if two threads initialize
97     'charset_aliases' simultaneously, both will produce the same value,
98     and everything will be ok if the two assignments to 'charset_aliases'
99     are atomic. But I don't know what will happen if the two assignments mix. */
100     #if __STDC__ != 1
101     # define volatile /* empty */
102     #endif
103     /* Pointer to the contents of the charset.alias file, if it has already been
104     read, else NULL. Its format is:
105     ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */
106     static const char * volatile charset_aliases;
107    
108     /* Return a pointer to the contents of the charset.alias file. */
109     static const char *
110     get_charset_aliases ()
111     {
112     const char *cp;
113    
114     cp = charset_aliases;
115     if (cp == NULL)
116     {
117     #if !(defined VMS || defined WIN32)
118     FILE *fp;
119     const char *dir = relocate (LIBDIR);
120     const char *base = "charset.alias";
121     char *file_name;
122    
123     /* Concatenate dir and base into freshly allocated file_name. */
124     {
125     size_t dir_len = strlen (dir);
126     size_t base_len = strlen (base);
127     int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1]));
128     file_name = (char *) malloc (dir_len + add_slash + base_len + 1);
129     if (file_name != NULL)
130     {
131     memcpy (file_name, dir, dir_len);
132     if (add_slash)
133     file_name[dir_len] = DIRECTORY_SEPARATOR;
134     memcpy (file_name + dir_len + add_slash, base, base_len + 1);
135     }
136     }
137    
138     if (file_name == NULL || (fp = fopen (file_name, "r")) == NULL)
139     /* Out of memory or file not found, treat it as empty. */
140     cp = "";
141     else
142     {
143     /* Parse the file's contents. */
144     int c;
145     char buf1[50+1];
146     char buf2[50+1];
147     char *res_ptr = NULL;
148     size_t res_size = 0;
149     size_t l1, l2;
150    
151     for (;;)
152     {
153     c = getc (fp);
154     if (c == EOF)
155     break;
156     if (c == '\n' || c == ' ' || c == '\t')
157     continue;
158     if (c == '#')
159     {
160     /* Skip comment, to end of line. */
161     do
162     c = getc (fp);
163     while (!(c == EOF || c == '\n'));
164     if (c == EOF)
165     break;
166     continue;
167     }
168     ungetc (c, fp);
169     if (fscanf (fp, "%50s %50s", buf1, buf2) < 2)
170     break;
171     l1 = strlen (buf1);
172     l2 = strlen (buf2);
173     if (res_size == 0)
174     {
175     res_size = l1 + 1 + l2 + 1;
176     res_ptr = (char *) malloc (res_size + 1);
177     }
178     else
179     {
180     res_size += l1 + 1 + l2 + 1;
181     res_ptr = (char *) realloc (res_ptr, res_size + 1);
182     }
183     if (res_ptr == NULL)
184     {
185     /* Out of memory. */
186     res_size = 0;
187     break;
188     }
189     strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1);
190     strcpy (res_ptr + res_size - (l2 + 1), buf2);
191     }
192     fclose (fp);
193     if (res_size == 0)
194     cp = "";
195     else
196     {
197     *(res_ptr + res_size) = '\0';
198     cp = res_ptr;
199     }
200     }
201    
202     if (file_name != NULL)
203     free (file_name);
204    
205     #else
206    
207     # if defined VMS
208     /* To avoid the troubles of an extra file charset.alias_vms in the
209     sources of many GNU packages, simply inline the aliases here. */
210     /* The list of encodings is taken from the OpenVMS 7.3-1 documentation
211     "Compaq C Run-Time Library Reference Manual for OpenVMS systems"
212     section 10.7 "Handling Different Character Sets". */
213     cp = "ISO8859-1" "\0" "ISO-8859-1" "\0"
214     "ISO8859-2" "\0" "ISO-8859-2" "\0"
215     "ISO8859-5" "\0" "ISO-8859-5" "\0"
216     "ISO8859-7" "\0" "ISO-8859-7" "\0"
217     "ISO8859-8" "\0" "ISO-8859-8" "\0"
218     "ISO8859-9" "\0" "ISO-8859-9" "\0"
219     /* Japanese */
220     "eucJP" "\0" "EUC-JP" "\0"
221     "SJIS" "\0" "SHIFT_JIS" "\0"
222     "DECKANJI" "\0" "DEC-KANJI" "\0"
223     "SDECKANJI" "\0" "EUC-JP" "\0"
224     /* Chinese */
225     "eucTW" "\0" "EUC-TW" "\0"
226     "DECHANYU" "\0" "DEC-HANYU" "\0"
227     "DECHANZI" "\0" "GB2312" "\0"
228     /* Korean */
229     "DECKOREAN" "\0" "EUC-KR" "\0";
230     # endif
231    
232     # if defined WIN32
233     /* To avoid the troubles of installing a separate file in the same
234     directory as the DLL and of retrieving the DLL's directory at
235     runtime, simply inline the aliases here. */
236    
237     cp = "CP936" "\0" "GBK" "\0"
238     "CP1361" "\0" "JOHAB" "\0"
239     "CP20127" "\0" "ASCII" "\0"
240     "CP20866" "\0" "KOI8-R" "\0"
241     "CP21866" "\0" "KOI8-RU" "\0"
242     "CP28591" "\0" "ISO-8859-1" "\0"
243     "CP28592" "\0" "ISO-8859-2" "\0"
244     "CP28593" "\0" "ISO-8859-3" "\0"
245     "CP28594" "\0" "ISO-8859-4" "\0"
246     "CP28595" "\0" "ISO-8859-5" "\0"
247     "CP28596" "\0" "ISO-8859-6" "\0"
248     "CP28597" "\0" "ISO-8859-7" "\0"
249     "CP28598" "\0" "ISO-8859-8" "\0"
250     "CP28599" "\0" "ISO-8859-9" "\0"
251     "CP28605" "\0" "ISO-8859-15" "\0";
252     # endif
253     #endif
254    
255     charset_aliases = cp;
256     }
257    
258     return cp;
259     }
260    
261     /* Determine the current locale's character encoding, and canonicalize it
262     into one of the canonical names listed in config.charset.
263     The result must not be freed; it is statically allocated.
264     If the canonical name cannot be determined, the result is a non-canonical
265     name. */
266    
267     #ifdef STATIC
268     STATIC
269     #endif
270     const char *
271     locale_charset ()
272     {
273     const char *codeset;
274     const char *aliases;
275    
276     #if !(defined WIN32 || defined OS2)
277    
278     # if HAVE_LANGINFO_CODESET
279    
280     /* Most systems support nl_langinfo (CODESET) nowadays. */
281     codeset = nl_langinfo (CODESET);
282    
283     # else
284    
285     /* On old systems which lack it, use setlocale or getenv. */
286     const char *locale = NULL;
287    
288     /* But most old systems don't have a complete set of locales. Some
289     (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't
290     use setlocale here; it would return "C" when it doesn't support the
291     locale name the user has set. */
292     # if HAVE_SETLOCALE && 0
293     locale = setlocale (LC_CTYPE, NULL);
294     # endif
295     if (locale == NULL || locale[0] == '\0')
296     {
297     locale = getenv ("LC_ALL");
298     if (locale == NULL || locale[0] == '\0')
299     {
300     locale = getenv ("LC_CTYPE");
301     if (locale == NULL || locale[0] == '\0')
302     locale = getenv ("LANG");
303     }
304     }
305    
306     /* On some old systems, one used to set locale = "iso8859_1". On others,
307     you set it to "language_COUNTRY.charset". In any case, we resolve it
308     through the charset.alias file. */
309     codeset = locale;
310    
311     # endif
312    
313     #elif defined WIN32
314    
315     static char buf[2 + 10 + 1];
316    
317     /* Woe32 has a function returning the locale's codepage as a number. */
318     sprintf (buf, "CP%u", GetACP ());
319     codeset = buf;
320    
321     #elif defined OS2
322    
323     const char *locale;
324     static char buf[2 + 10 + 1];
325     ULONG cp[3];
326     ULONG cplen;
327    
328     /* Allow user to override the codeset, as set in the operating system,
329     with standard language environment variables. */
330     locale = getenv ("LC_ALL");
331     if (locale == NULL || locale[0] == '\0')
332     {
333     locale = getenv ("LC_CTYPE");
334     if (locale == NULL || locale[0] == '\0')
335     locale = getenv ("LANG");
336     }
337     if (locale != NULL && locale[0] != '\0')
338     {
339     /* If the locale name contains an encoding after the dot, return it. */
340     const char *dot = strchr (locale, '.');
341    
342     if (dot != NULL)
343     {
344     const char *modifier;
345    
346     dot++;
347     /* Look for the possible @... trailer and remove it, if any. */
348     modifier = strchr (dot, '@');
349     if (modifier == NULL)
350     return dot;
351     if (modifier - dot < sizeof (buf))
352     {
353     memcpy (buf, dot, modifier - dot);
354     buf [modifier - dot] = '\0';
355     return buf;
356     }
357     }
358    
359     /* Resolve through the charset.alias file. */
360     codeset = locale;
361     }
362     else
363     {
364     /* OS/2 has a function returning the locale's codepage as a number. */
365     if (DosQueryCp (sizeof (cp), cp, &cplen))
366     codeset = "";
367     else
368     {
369     sprintf (buf, "CP%u", cp[0]);
370     codeset = buf;
371     }
372     }
373    
374     #endif
375    
376     if (codeset == NULL)
377     /* The canonical name cannot be determined. */
378     codeset = "";
379    
380     /* Resolve alias. */
381     for (aliases = get_charset_aliases ();
382     *aliases != '\0';
383     aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
384     if (strcmp (codeset, aliases) == 0
385     || (aliases[0] == '*' && aliases[1] == '\0'))
386     {
387     codeset = aliases + strlen (aliases) + 1;
388     break;
389     }
390    
391     /* Don't return an empty string. GNU libc and GNU libiconv interpret
392     the empty string as denoting "the locale's character encoding",
393     thus GNU libiconv would call this function a second time. */
394     if (codeset[0] == '\0')
395     codeset = "ASCII";
396    
397     return codeset;
398     }

   
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