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

fusl/src/stdio/__string_read.c

Index: fusl/src/stdio/__string_read.c
diff --git a/fusl/src/stdio/__string_read.c b/fusl/src/stdio/__string_read.c
new file mode 100644
index 0000000000000000000000000000000000000000..7b50a7e1154224a40ddcbb204a429eb74380ffc9
--- /dev/null
+++ b/fusl/src/stdio/__string_read.c
@@ -0,0 +1,16 @@
+#include "stdio_impl.h"
+#include <string.h>
+
+size_t __string_read(FILE *f, unsigned char *buf, size_t len)
+{
+	char *src = f->cookie;
+	size_t k = len+256;
+	char *end = memchr(src, 0, k);
+	if (end) k = end-src;
+	if (k < len) len = k;
+	memcpy(buf, src, len);
+	f->rpos = (void *)(src+len);
+	f->rend = (void *)(src+k);
+	f->cookie = src+k;
+	return len;
+}