1 /*-------------------------------------------------------------------------
4 * Wrapper to work around bugs in Windows setlocale() implementation
6 * Copyright (c) 2011-2017, PostgreSQL Global Development Group
9 * src/port/win32setlocale.c
12 * The setlocale() function in Windows is broken in two ways. First, it
13 * has a problem with locale names that have a dot in the country name. For
16 * "Chinese (Traditional)_Hong Kong S.A.R..950"
18 * For some reason, setlocale() doesn't accept that as argument, even though
19 * setlocale(LC_ALL, NULL) returns exactly that. Fortunately, it accepts
20 * various alternative names for such countries, so to work around the broken
21 * setlocale() function, we map the troublemaking locale names to accepted
22 * aliases, before calling setlocale().
24 * The second problem is that the locale name for "Norwegian (Bokmål)"
25 * contains a non-ASCII character. That's problematic, because it's not clear
26 * what encoding the locale name itself is supposed to be in, when you
27 * haven't yet set a locale. Also, it causes problems when the cluster
28 * contains databases with different encodings, as the locale name is stored
29 * in the pg_database system catalog. To work around that, when setlocale()
30 * returns that locale name, map it to a pure-ASCII alias for the same
32 *-------------------------------------------------------------------------
42 * String in locale name to replace. Can be a single string (end is NULL),
43 * or separate start and end strings. If two strings are given, the locale
44 * name must contain both of them, and everything between them is
45 * replaced. This is used for a poor-man's regexp search, allowing
46 * replacement of "start.*end".
48 const char *locale_name_start;
49 const char *locale_name_end;
51 const char *replacement; /* string to replace the match with */
55 * Mappings applied before calling setlocale(), to the argument.
57 static const struct locale_map locale_map_argument[] = {
59 * "HKG" is listed here:
60 * http://msdn.microsoft.com/en-us/library/cdax410z%28v=vs.71%29.aspx
61 * (Country/Region Strings).
63 * "ARE" is the ISO-3166 three-letter code for U.A.E. It is not on the
64 * above list, but seems to work anyway.
66 {"Hong Kong S.A.R.", NULL, "HKG"},
67 {"U.A.E.", NULL, "ARE"},
70 * The ISO-3166 country code for Macau S.A.R. is MAC, but Windows doesn't
71 * seem to recognize that. And Macau isn't listed in the table of accepted
72 * abbreviations linked above. Fortunately, "ZHM" seems to be accepted as
73 * an alias for "Chinese (Traditional)_Macau S.A.R..950". I'm not sure
74 * where "ZHM" comes from, must be some legacy naming scheme. But hey, it
77 * Note that unlike HKG and ARE, ZHM is an alias for the *whole* locale
78 * name, not just the country part.
80 * Some versions of Windows spell it "Macau", others "Macao".
82 {"Chinese (Traditional)_Macau S.A.R..950", NULL, "ZHM"},
83 {"Chinese_Macau S.A.R..950", NULL, "ZHM"},
84 {"Chinese (Traditional)_Macao S.A.R..950", NULL, "ZHM"},
85 {"Chinese_Macao S.A.R..950", NULL, "ZHM"},
90 * Mappings applied after calling setlocale(), to its return value.
92 static const struct locale_map locale_map_result[] = {
94 * "Norwegian (Bokmål)" locale name contains the a-ring character.
95 * Map it to a pure-ASCII alias.
97 * It's not clear what encoding setlocale() uses when it returns the
98 * locale name, so to play it safe, we search for "Norwegian (Bok*l)".
100 {"Norwegian (Bokm", "l)_Norway", "Norwegian_Norway"},
104 #define MAX_LOCALE_NAME_LEN 100
107 map_locale(const struct locale_map * map, const char *locale)
109 static char aliasbuf[MAX_LOCALE_NAME_LEN];
112 /* Check if the locale name matches any of the problematic ones. */
113 for (i = 0; map[i].locale_name_start != NULL; i++)
115 const char *needle_start = map[i].locale_name_start;
116 const char *needle_end = map[i].locale_name_end;
117 const char *replacement = map[i].replacement;
119 char *match_start = NULL;
120 char *match_end = NULL;
122 match = strstr(locale, needle_start);
126 * Found a match for the first part. If this was a two-part
127 * replacement, find the second part.
132 match = strstr(match_start + strlen(needle_start), needle_end);
134 match_end = match + strlen(needle_end);
139 match_end = match_start + strlen(needle_start);
144 /* Found a match. Replace the matched string. */
145 int matchpos = match_start - locale;
146 int replacementlen = strlen(replacement);
147 char *rest = match_end;
148 int restlen = strlen(rest);
150 /* check that the result fits in the static buffer */
151 if (matchpos + replacementlen + restlen + 1 > MAX_LOCALE_NAME_LEN)
154 memcpy(&aliasbuf[0], &locale[0], matchpos);
155 memcpy(&aliasbuf[matchpos], replacement, replacementlen);
156 /* includes null terminator */
157 memcpy(&aliasbuf[matchpos + replacementlen], rest, restlen + 1);
163 /* no match, just return the original string */
168 pgwin32_setlocale(int category, const char *locale)
170 const char *argument;
176 argument = map_locale(locale_map_argument, locale);
178 /* Call the real setlocale() function */
179 result = setlocale(category, argument);
182 * setlocale() is specified to return a "char *" that the caller is
183 * forbidden to modify, so casting away the "const" is innocuous.
186 result = (char *) map_locale(locale_map_result, result);