3 * check_charset.c -- routines for character sets
11 * Check if we can display a given character set natively.
12 * We are passed the length of the initial part of the
13 * string to check, since we want to allow the name of the
14 * character set to be a substring of a larger string.
18 check_charset (char *str, int len)
20 static char *mm_charset = NULL;
21 static char *alt_charset = NULL;
25 /* Cache the name of our default character set */
27 if (!(mm_charset = getenv ("MM_CHARSET")))
28 mm_charset = "US-ASCII";
29 mm_len = strlen (mm_charset);
31 /* US-ASCII is a subset of the ISO-8859-X character sets */
32 if (!strncasecmp("ISO-8859-", mm_charset, 9)) {
33 alt_charset = "US-ASCII";
34 alt_len = strlen (alt_charset);
38 /* Check if character set is OK */
39 if ((len == mm_len) && !strncasecmp(str, mm_charset, mm_len))
41 if (alt_charset && (len == alt_len) && !strncasecmp(str, alt_charset, alt_len))
49 * Return the name of the character set we are
50 * using for 8bit text.
53 write_charset_8bit (void)
55 static char *mm_charset = NULL;
58 * Cache the name of the character set to
61 if (!mm_charset && !(mm_charset = getenv ("MM_CHARSET")))
62 mm_charset = "x-unknown";