inferno-os tree was separated from the inferno-os-android (separated from the Android driver)

1 files changed, 99 insertions, 0 deletions

diff --git a/liblogfs/group.c b/liblogfs/group.c
new file mode 100644
index 0000000..8a83b1e
--- /dev/null
+++ b/liblogfs/group.c
@@ -0,0 +1,99 @@
+#include "logfsos.h"
+#include "logfs.h"
+#include "local.h"
+
+enum {
+	GROUPMOD = 127
+};
+
+static int
+groupcompare(void *a, void *b)
+{
+	Group *g = a;
+	char *uid = b;
+	return g->uid == uid;
+}
+
+static int
+unamecompare(void *a, void *b)
+{
+	Uname *u = a;
+	char *uname = b;
+	return u->uname == uname;
+}
+
+static int
+groupallocsize(void *key)
+{
+	USED(key);
+	return sizeof(Group);
+}
+
+static int
+unameallocsize(void *key)
+{
+	USED(key);
+	return sizeof(Uname);
+}
+
+char *
+logfsgroupmapnew(GroupMap **groupmapp, UnameMap **unamemapp)
+{
+	char *errmsg;
+	errmsg = logfsmapnew(GROUPMOD, logfshashulong, groupcompare, groupallocsize, nil, groupmapp);
+	if(errmsg)
+		return errmsg;
+	errmsg = logfsmapnew(GROUPMOD, logfshashulong, unamecompare, unameallocsize, nil, unamemapp);
+	if(errmsg)
+		logfsmapfree(groupmapp);
+	return errmsg;
+}
+
+char *
+logfsgroupmapnewentry(GroupMap *gm, UnameMap *um, char *uid, char *uname, Group **groupp, Uname **unamep)
+{
+	char *errmsg;
+	errmsg = logfsmapnewentry(gm, uid, groupp);
+	if(errmsg)
+		return errmsg;
+	if(*groupp == nil)
+		return "uid already exists";
+	(*groupp)->uid = uid;
+	errmsg = logfsgroupsetnew(&(*groupp)->members);
+	if(errmsg) {
+		logfsmapdeleteentry(gm, uid);
+		return errmsg;
+	}
+	errmsg = logfsmapnewentry(um, uname, unamep);
+	if(errmsg == nil && *unamep == nil)
+		errmsg = "uname already exists";
+	if(errmsg) {
+		logfsgroupsetfree(&(*groupp)->members);
+		logfsmapdeleteentry(gm, uid);
+		return errmsg;
+	}
+	(*groupp)->uname = uname;
+	(*unamep)->uname = uname;
+	(*unamep)->g = *groupp;
+	return nil;
+}
+
+char *
+logfsgroupmapfinduname(GroupMap *m, char *uid)
+{
+	Group *g;
+	g = logfsgroupmapfindentry(m, uid);
+	if(g)
+		return g->uname;
+	return nil;
+}
+
+char *
+logfsunamemapfinduid(UnameMap *m, char *uname)
+{
+	Uname *u;
+	u = logfsunamemapfindentry(m, uname);
+	if(u)
+		return u->g->uid;
+	return nil;
+}