1 /* vi: set sw=4 ts=4: */
3 * Unicode support routines.
5 * Copyright (C) 2009 Denys Vlasenko
7 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
12 size_t FAST_FUNC bb_mbstrlen(const char *string)
14 size_t width = mbstowcs(NULL, string, INT_MAX);
15 if (width == (size_t)-1L)
16 return strlen(string);
20 #if !ENABLE_LOCALE_SUPPORT
22 /* Crude "locale support" which knows only C and Unicode locales */
24 /* unicode_is_enabled:
26 * 1: not unicode (IOW: assuming one char == one byte)
29 # if !ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
30 # define unicode_is_enabled 2
32 static smallint unicode_is_enabled;
33 void FAST_FUNC check_unicode_in_env(void)
37 if (unicode_is_enabled)
39 unicode_is_enabled = 1;
41 lang = getenv("LANG");
42 if (!lang || !strstr(lang, ".utf8"))
45 unicode_is_enabled = 2;
49 static size_t wcrtomb_internal(char *s, wchar_t wc)
59 /* RFC 3629 says that Unicode ends at 10FFFF,
60 * but we cover entire 32 bits */
62 /* 4000000-FFFFFFFF -> 111111tt 10tttttt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
63 /* 200000-3FFFFFF -> 111110tt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
64 /* 10000-1FFFFF -> 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx */
65 /* 800-FFFF -> 1110yyyy 10yyyyxx 10xxxxxx */
66 /* 80-7FF -> 110yyyxx 10xxxxxx */
68 /* How many bytes do we need? */
70 /* (0x80000000+ would result in n = 7, limiting n to 6) */
71 while (v >= 0x800 && n < 6) {
75 /* Fill bytes n-1..1 */
78 s[i] = (wc & 0x3f) | 0x80;
82 s[0] = wc | (uint8_t)(0x3f00 >> n);
86 size_t FAST_FUNC wcrtomb(char *s, wchar_t wc, mbstate_t *ps UNUSED_PARAM)
88 if (unicode_is_enabled != 2) {
93 return wcrtomb_internal(s, wc);
96 size_t FAST_FUNC wcstombs(char *dest, const wchar_t *src, size_t n)
100 if (unicode_is_enabled != 2) {
111 while (n >= MB_CUR_MAX) {
113 size_t len = wcrtomb_internal(dest, wc);
121 char tbuf[MB_CUR_MAX];
123 size_t len = wcrtomb_internal(tbuf, wc);
127 memcpy(dest, tbuf, len);
136 size_t FAST_FUNC mbstowcs(wchar_t *dest, const char *src, size_t n)
140 if (unicode_is_enabled != 2) {
142 unsigned char c = *src++;
155 unsigned c = (unsigned char) *src++;
166 /* 80-7FF -> 110yyyxx 10xxxxxx */
167 /* 800-FFFF -> 1110yyyy 10yyyyxx 10xxxxxx */
168 /* 10000-1FFFFF -> 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx */
169 /* 200000-3FFFFFF -> 111110tt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
170 /* 4000000-FFFFFFFF -> 111111tt 10tttttt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
175 } while ((c & 0x80) && bytes < 6);
178 c = (uint8_t)(c) >> bytes;
181 unsigned ch = (unsigned char) *src++;
182 if ((ch & 0xc0) != 0x80) {
185 c = (c << 6) + (ch & 0x3f);
189 /* Need to check that c isn't produced by overlong encoding */
190 /* Example: 11000000 10000000 converts to NUL */
191 /* 11110000 10000000 10000100 10000000 converts to 0x100 */
192 /* correct encoding: 11000100 10000000 */
193 if (c <= 0x7f) { /* crude check */
195 //or maybe: c = 0xfffd; /* replacement character */
206 int FAST_FUNC iswspace(wint_t wc)
208 return (unsigned)wc <= 0x7f && isspace(wc);
211 int FAST_FUNC iswalnum(wint_t wc)
213 return (unsigned)wc <= 0x7f && isalnum(wc);
216 int FAST_FUNC iswpunct(wint_t wc)
218 return (unsigned)wc <= 0x7f && ispunct(wc);