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Add a variant of `locale_charset' that returns its result based solely on
information from the environment. See
http://lists.gnu.org/archive/html/guile-devel/2011-11/msg00040.html for the
rationale.
--- a/lib/localcharset.c
+++ b/lib/localcharset.c
@@ -544,3 +544,73 @@ locale_charset (void)
return codeset;
}
+
+/* A variant of the above, without calls to `setlocale', `nl_langinfo',
+ etc. */
+const char *
+environ_locale_charset (void)
+{
+ static char buf[2 + 10 + 1];
+ const char *codeset, *aliases;
+ const char *locale = NULL;
+
+ locale = getenv ("LC_ALL");
+ if (locale == NULL || locale[0] == '\0')
+ {
+ locale = getenv ("LC_CTYPE");
+ if (locale == NULL || locale[0] == '\0')
+ locale = getenv ("LANG");
+ }
+
+ if (locale != NULL && locale[0] != '\0')
+ {
+ /* If the locale name contains an encoding after the dot, return it. */
+ const char *dot = strchr (locale, '.');
+
+ if (dot != NULL)
+ {
+ const char *modifier;
+
+ dot++;
+ /* Look for the possible @... trailer and remove it, if any. */
+ modifier = strchr (dot, '@');
+ if (modifier == NULL)
+ return dot;
+ if (modifier - dot < sizeof (buf))
+ {
+ memcpy (buf, dot, modifier - dot);
+ buf [modifier - dot] = '\0';
+ return buf;
+ }
+ }
+ else if (strcmp (locale, "C") == 0)
+ {
+ strcpy (buf, "ASCII");
+ return buf;
+ }
+ else
+ codeset = "";
+ }
+ else
+ codeset = "";
+
+ /* Resolve alias. */
+ for (aliases = get_charset_aliases ();
+ *aliases != '\0';
+ aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
+ if (strcmp (codeset, aliases) == 0
+ || (aliases[0] == '*' && aliases[1] == '\0'))
+ {
+ codeset = aliases + strlen (aliases) + 1;
+ break;
+ }
+
+ /* Don't return an empty string. GNU libc and GNU libiconv interpret
+ the empty string as denoting "the locale's character encoding",
+ thus GNU libiconv would call this function a second time. */
+ if (codeset[0] == '\0')
+ /* Default to Latin-1, for backward compatibility with Guile 1.8. */
+ codeset = "ISO-8859-1";
+
+ return codeset;
+}
|
