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lineedit+unicode: code shrink

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function                                             old     new   delta
wcrtomb_internal                                     161      83     -78

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-07-16 03:06:22 +02:00
parent f6106e6041
commit 01ba1676af
1 changed files with 15 additions and 23 deletions
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38
libbb/unicode.c
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@ -48,7 +48,7 @@ void FAST_FUNC check_unicode_in_env(void)
static size_t wcrtomb_internal(char *s, wchar_t wc)
{
int n;
int n, i;
uint32_t v = wc;
if (v <= 0x7f) {
@ -59,34 +59,26 @@ static size_t wcrtomb_internal(char *s, wchar_t wc)
/* RFC 3629 says that Unicode ends at 10FFFF,
* but we cover entire 32 bits */
n = 2;
/* 4000000-FFFFFFFF -> 111111tt 10tttttt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
if (v >= 0x4000000) {
s[5] = (wc & 0x3f) | 0x80;
wc = (uint32_t)wc >> 6; /* ensuring that high bits are 0 */
n++;
}
/* 200000-3FFFFFF -> 111110tt 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx */
if (v >= 0x200000) {
s[4] = (wc & 0x3f) | 0x80;
wc >>= 6;
n++;
}
/* 10000-1FFFFF -> 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx */
if (v >= 0x10000) {
s[3] = (wc & 0x3f) | 0x80;
wc >>= 6;
n++;
}
/* 800-FFFF -> 1110yyyy 10yyyyxx 10xxxxxx */
if (v >= 0x800) {
s[2] = (wc & 0x3f) | 0x80;
wc >>= 6;
/* 80-7FF -> 110yyyxx 10xxxxxx */
/* How many bytes do we need? */
n = 2;
/* (0x80000000+ would result in n = 7, limiting n to 6) */
while (v >= 0x800 && n < 6) {
v >>= 5;
n++;
}
/* 80-7FF -> 110yyyxx 10xxxxxx */
s[1] = (wc & 0x3f) | 0x80;
wc >>= 6;
/* Fill bytes n-1..1 */
i = n;
while (--i) {
s[i] = (wc & 0x3f) | 0x80;
wc >>= 6;
}
/* Fill byte 0 */
s[0] = wc | (uint8_t)(0x3f00 >> n);
return n;
}