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

fusl/src/network/dn_expand.c

+#include <resolv.h>
+#include "libc.h"
+
+int __dn_expand(const unsigned char *base, const unsigned char *end, const unsigned char *src, char *dest, int space)
+{
+        const unsigned char *p = src;
+        char *dend, *dbegin = dest;
+        int len = -1, i, j;
+        if (p==end || space <= 0) return -1;
+        dend = dest + (space > 254 ? 254 : space);
+        /* detect reference loop using an iteration counter */
+        for (i=0; i < end-base; i+=2) {
+                /* loop invariants: p<end, dest<dend */
+                if (*p & 0xc0) {
+                        if (p+1==end) return -1;
+                        j = ((p[0] & 0x3f) << 8) | p[1];
+                        if (len < 0) len = p+2-src;
+                        if (j >= end-base) return -1;
+                        p = base+j;
+                } else if (*p) {
+                        if (dest != dbegin) *dest++ = '.';
+                        j = *p++;
+                        if (j >= end-p || j >= dend-dest) return -1;
+                        while (j--) *dest++ = *p++;
+                } else {
+                        *dest = 0;
+                        if (len < 0) len = p+1-src;
+                        return len;
+                }
+        }
+        return -1;
+}
+
+weak_alias(__dn_expand, dn_expand);