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

fusl/src/passwd/getgrent.c

Index: fusl/src/passwd/getgrent.c
diff --git a/fusl/src/passwd/getgrent.c b/fusl/src/passwd/getgrent.c
new file mode 100644
index 0000000000000000000000000000000000000000..835b9ab5a22a7edf8b906d547626cdcaeff1d8e1
--- /dev/null
+++ b/fusl/src/passwd/getgrent.c
@@ -0,0 +1,39 @@
+#include "pwf.h"
+
+static FILE *f;
+static char *line, **mem;
+static struct group gr;
+
+void setgrent()
+{
+	if (f) fclose(f);
+	f = 0;
+}
+
+weak_alias(setgrent, endgrent);
+
+struct group *getgrent()
+{
+	struct group *res;
+	size_t size=0, nmem=0;
+	if (!f) f = fopen("/etc/group", "rbe");
+	if (!f) return 0;
+	__getgrent_a(f, &gr, &line, &size, &mem, &nmem, &res);
+	return res;
+}
+
+struct group *getgrgid(gid_t gid)
+{
+	struct group *res;
+	size_t size=0, nmem=0;
+	__getgr_a(0, gid, &gr, &line, &size, &mem, &nmem, &res);
+	return res;
+}
+
+struct group *getgrnam(const char *name)
+{
+	struct group *res;
+	size_t size=0, nmem=0;
+	__getgr_a(name, 0, &gr, &line, &size, &mem, &nmem, &res);
+	return res;
+}