Add a "fork" of musl as //fusl.

fusl/src/network/dns_parse.c

+#include <string.h>
+
+int __dns_parse(const unsigned char *r, int rlen, int (*callback)(void *, int, const void *, int, const void *), void *ctx)
+{
+        int qdcount, ancount;
+        const unsigned char *p;
+        int len;
+
+        if (rlen<12) return -1;
+        if ((r[3]&15)) return 0;
+        p = r+12;
+        qdcount = r[4]*256 + r[5];
+        ancount = r[6]*256 + r[7];
+        if (qdcount+ancount > 64) return -1;
+        while (qdcount--) {
+                while (p-r < rlen && *p-1U < 127) p++;
+                if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6)
+                        return -1;
+                p += 5 + !!*p;
+        }
+        while (ancount--) {
+                while (p-r < rlen && *p-1U < 127) p++;
+                if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6)
+                        return -1;
+                p += 1 + !!*p;
+                len = p[8]*256 + p[9];
+                if (p+len > r+rlen) return -1;
+                if (callback(ctx, p[1], p+10, len, r) < 0) return -1;
+                p += 10 + len;
+        }
+        return 0;
+}