static int
c99_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
unsigned char c;
ucs4_t wc;
int i;
c = s[0];
if (c < 0xa0) {
if (c != '\\') {
*pwc = c;
return 1;
}
if (n < 2)
return RET_TOOFEW(0);
c = s[1];
if (c == 'u') {
wc = 0;
for (i = 2; i < 6; i++) {
if (n <= i)
return RET_TOOFEW(0);
c = s[i];
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c -= 'A'-10;
else if (c >= 'a' && c <= 'z')
c -= 'a'-10;
else
goto simply_backslash;
wc |= (ucs4_t) c << (4 * (5-i));
}
if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
|| wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
*pwc = wc;
return 6;
}
} else if (c == 'U') {
wc = 0;
for (i = 2; i < 10; i++) {
if (n <= i)
return RET_TOOFEW(0);
c = s[i];
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c -= 'A'-10;
else if (c >= 'a' && c <= 'z')
c -= 'a'-10;
else
goto simply_backslash;
wc |= (ucs4_t) c << (4 * (9-i));
}
if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
|| wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
*pwc = wc;
return 10;
}
} else
goto simply_backslash;
}
return RET_ILSEQ;
simply_backslash:
*pwc = '\\';
return 1;
}
static int
c99_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
if (wc < 0xa0) {
*r = wc;
return 1;
} else {
int result;
unsigned char u;
if (wc < 0x10000) {
result = 6;
u = 'u';
} else {
result = 10;
u = 'U';
}
if (n >= result) {
int count;
r[0] = '\\';
r[1] = u;
r += 2;
for (count = result-3; count >= 0; count--) {
unsigned int i = (wc >> (4*count)) & 0x0f;
*r++ = (i < 10 ? '0'+i : 'a'-10+i);
}
return result;
} else
return RET_TOOSMALL;
}
}