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#include "mbstring.h"
#include "rune.h"
#include "internal/common.h"
int
u8tor(rune *ch, const char8_t *s)
{
int n = 0;
if (U1(s[0])) {
*ch = s[0];
n = 1;
} else if (U2(s[0]) && UC(s[1])) {
*ch = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
n = 2;
} else if (U3(s[0]) && UC(s[1]) && UC(s[2])) {
*ch = ((s[0] & 0x0F) << 12) | ((s[1] & 0x3F) << 6) | (s[2] & 0x3F);
n = 3;
} else if (U4(s[0]) && UC(s[1]) && UC(s[2]) && UC(s[3])) {
*ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3F) << 12)
| ((s[2] & 0x3F) << 6) | (s[3] & 0x3F);
n = 4;
}
if (n && u8chkr(*ch))
return n;
*ch = RUNE_ERROR;
return 1;
}
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