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-rw-r--r--lib/unicode/string/u8casefold.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/unicode/string/u8casefold.c b/lib/unicode/string/u8casefold.c
new file mode 100644
index 0000000..6c0b61d
--- /dev/null
+++ b/lib/unicode/string/u8casefold.c
@@ -0,0 +1,24 @@
+#include "mbstring.h"
+#include "unicode/prop.h"
+#include "unicode/string.h"
+
+size_t
+u8casefold(char8_t *restrict dst, size_t dstn, const char8_t *src, size_t srcn,
+ enum caseflags flags)
+{
+ rune ch;
+ size_t n = 0;
+
+ while (u8next(&ch, &src, &srcn)) {
+ struct rview rv = uprop_get_cf(ch, flags & CF_LANG_AZ);
+ for (size_t i = 0; i < rv.len; i++) {
+ if (n >= dstn) {
+ char8_t buf[U8_LEN_MAX];
+ n += rtou8(buf, sizeof(buf), rv.p[i]);
+ } else
+ n += rtou8(dst + n, dstn - n, rv.p[i]);
+ }
+ }
+
+ return n;
+}