1 files changed, 42 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/locale/__mo_lookup.c b/libc-top-half/musl/src/locale/__mo_lookup.c
new file mode 100644
index 0000000..d18ab77
--- /dev/null
+++ b/libc-top-half/musl/src/locale/__mo_lookup.c
@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <string.h>
+
+static inline uint32_t swapc(uint32_t x, int c)
+{
+	return c ? x>>24 | x>>8&0xff00 | x<<8&0xff0000 | x<<24 : x;
+}
+
+const char *__mo_lookup(const void *p, size_t size, const char *s)
+{
+	const uint32_t *mo = p;
+	int sw = *mo - 0x950412de;
+	uint32_t b = 0, n = swapc(mo[2], sw);
+	uint32_t o = swapc(mo[3], sw);
+	uint32_t t = swapc(mo[4], sw);
+	if (n>=size/4 || o>=size-4*n || t>=size-4*n || ((o|t)%4))
+		return 0;
+	o/=4;
+	t/=4;
+	for (;;) {
+		uint32_t ol = swapc(mo[o+2*(b+n/2)], sw);
+		uint32_t os = swapc(mo[o+2*(b+n/2)+1], sw);
+		if (os >= size || ol >= size-os || ((char *)p)[os+ol])
+			return 0;
+		int sign = strcmp(s, (char *)p + os);
+		if (!sign) {
+			uint32_t tl = swapc(mo[t+2*(b+n/2)], sw);
+			uint32_t ts = swapc(mo[t+2*(b+n/2)+1], sw);
+			if (ts >= size || tl >= size-ts || ((char *)p)[ts+tl])
+				return 0;
+			return (char *)p + ts;
+		}
+		else if (n == 1) return 0;
+		else if (sign < 0)
+			n /= 2;
+		else {
+			b += n/2;
+			n -= n/2;
+		}
+	}
+	return 0;
+}