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#include <errno.h>
#include <stdckdint.h>
#include "macros.h"
#include "mbstring.h"
#include "unicode/prop.h"
#include "unicode/string.h"
char8_t *
u8casefold(size_t *dstn, struct u8view sv, enum caseflags flags, alloc_fn alloc,
void *alloc_ctx)
{
ASSUME(dstn != nullptr);
ASSUME(alloc != nullptr);
size_t bufsz;
if (ckd_mul(&bufsz, sv.len, (size_t)U8CASEFOLD_SCALE)) {
errno = EOVERFLOW;
return nullptr;
}
char8_t *dst = alloc(alloc_ctx, nullptr, 0, bufsz, alignof(char8_t));
rune ch;
size_t n = 0;
while (u8next(&ch, &sv)) {
struct rview rv = uprop_get_cf(ch, flags & CF_LANG_AZ);
for (size_t i = 0; i < rv.len; i++)
n += rtou8(dst + n, bufsz - n, rv.p[i]);
}
*dstn = n;
return alloc(alloc_ctx, dst, bufsz, n, alignof(char8_t));
}
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