1 files changed, 99 insertions, 0 deletions
diff --git a/libbb/bb_pwd.c b/libbb/bb_pwd.c
new file mode 100644
index 0000000..65eb692
--- /dev/null
+++ b/libbb/bb_pwd.c
@@ -0,0 +1,99 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * password utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+#include "libbb.h"
+
+#define assert(x) ((void)0)
+
+/* internal function for bb_getpwuid and bb_getgrgid */
+/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
+ * flexible:
+ *
+ * bufsize > 0:      If idname is not NULL it is copied to buffer,
+ *                   and buffer is returned. Else id as string is written
+ *                   to buffer, and NULL is returned.
+ *
+ * bufsize == 0:     idname is returned.
+ *
+ * bufsize < 0:      If idname is not NULL it is returned.
+ *                   Else an error message is printed and the program exits.
+ */
+static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix)
+{
+	if (bufsize > 0) {
+		assert(buffer != NULL);
+		if (idname) {
+			return safe_strncpy(buffer, idname, bufsize);
+		}
+		snprintf(buffer, bufsize, "%ld", id);
+	} else if (bufsize < 0 && !idname) {
+		bb_error_msg_and_die("unknown %cid %ld", prefix, id);
+	}
+	return idname;
+}
+
+/* bb_getpwuid, bb_getgrgid:
+ * bb_getXXXid(buf, bufsz, id) - copy user/group name or id
+ *               as a string to buf, return user/group name or NULL
+ * bb_getXXXid(NULL, 0, id) - return user/group name or NULL
+ * bb_getXXXid(NULL, -1, id) - return user/group name or exit
+ */
+/* gets a username given a uid */
+char* FAST_FUNC bb_getpwuid(char *name, int bufsize, long uid)
+{
+	struct passwd *myuser = getpwuid(uid);
+
+	return bb_getug(name, bufsize,
+			(myuser ? myuser->pw_name : (char*)myuser),
+			uid, 'u');
+}
+/* gets a groupname given a gid */
+char* FAST_FUNC bb_getgrgid(char *group, int bufsize, long gid)
+{
+	struct group *mygroup = getgrgid(gid);
+
+	return bb_getug(group, bufsize,
+			(mygroup ? mygroup->gr_name : (char*)mygroup),
+			gid, 'g');
+}
+
+/* returns a gid given a group name */
+long FAST_FUNC xgroup2gid(const char *name)
+{
+	struct group *mygroup;
+
+	mygroup = getgrnam(name);
+	if (mygroup == NULL)
+		bb_error_msg_and_die("unknown group name: %s", name);
+
+	return mygroup->gr_gid;
+}
+
+/* returns a uid given a username */
+long FAST_FUNC xuname2uid(const char *name)
+{
+	struct passwd *myuser;
+
+	myuser = getpwnam(name);
+	if (myuser == NULL)
+		bb_error_msg_and_die("unknown user %s", name);
+
+	return myuser->pw_uid;
+}
+
+unsigned long FAST_FUNC get_ug_id(const char *s,
+		long FAST_FUNC (*xname2id)(const char *))
+{
+	unsigned long r;
+
+	r = bb_strtoul(s, NULL, 10);
+	if (errno)
+		return xname2id(s);
+	return r;
+}