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#include <gu/ucs.h>
#include <gu/assert.h>
GU_DEFINE_TYPE(GuUCSExn, abstract, _);
bool
gu_char_is_valid(char c)
{
if (c < 0) {
return false;
} else if (c < 64) {
return UINT64_C(0xffffffef00003f81) & (UINT64_C(1) << c);
}
#if CHAR_MAX > 127 // Let's avoid spurious warnings
else if (c > 127) {
return false;
}
#endif
return UINT64_C(0x7ffffffefffffffe) & (UINT64_C(1) << (c - 64));
}
char
gu_ucs_char(GuUCS uc, GuExn* err)
{
if (0 <= uc && uc <= 127) {
char c = (char) uc;
if (gu_char_is_valid(c)) {
return c;
}
}
gu_raise(err, GuUCSExn);
return 0;
}
size_t
gu_str_to_ucs(const char* cbuf, size_t len, GuUCS* ubuf, GuExn* err)
{
size_t n = 0;
while (n < len) {
char c = cbuf[n];
if (!gu_char_is_valid(c)) {
gu_raise(err, GuUCSExn);
return n;
}
ubuf[n] = gu_char_ucs(c);
n++;
}
return n;
}
size_t
gu_ucs_to_str(const GuUCS* ubuf, size_t len, char* cbuf, GuExn* err)
{
size_t n = 0;
while (n < len) {
char c = gu_ucs_char(ubuf[n], err);
if (!gu_ok(err)) {
break;
}
cbuf[n] = c;
n++;
}
return n;
}
extern inline bool
gu_ucs_valid(GuUCS ucs);
GuUCS
gu_char_ucs(char c)
{
gu_require(gu_char_is_valid(c));
GuUCS u = (GuUCS) c;
gu_ensure(u < 0x80);
return u;
}
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