Separate _posix1e_acl_id_to_name() into a separate file, to

break an unnecessary dependency on getpwuid() and getgrgid().

MFC after: 1 month

1 files changed, 100 insertions, 0 deletions

diff --git a/lib/libc/posix1e/acl_id_to_name.c b/lib/libc/posix1e/acl_id_to_name.c
new file mode 100644
index 0000000..aa10809
--- /dev/null
+++ b/lib/libc/posix1e/acl_id_to_name.c
@@ -0,0 +1,100 @@
+/*-
+ * Copyright (c) 1999-2001, 2008 Robert N. M. Watson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/*
+ * Support functionality for the POSIX.1e ACL interface
+ * These calls are intended only to be called within the library.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include "namespace.h"
+#include <sys/acl.h>
+#include "un-namespace.h"
+#include <errno.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "acl_support.h"
+
+/*
+ * Given a uid/gid, return a username/groupname for the text form of an ACL.
+ * Note that we truncate user and group names, rather than error out, as
+ * this is consistent with other tools manipulating user and group names.
+ * XXX NOT THREAD SAFE, RELIES ON GETPWUID, GETGRGID
+ * XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE
+ * MAY HAVE SIDE-EFFECTS
+ */
+int
+_posix1e_acl_id_to_name(acl_tag_t tag, uid_t id, ssize_t buf_len, char *buf,
+    int flags)
+{
+	struct group	*g;
+	struct passwd	*p;
+	int	i;
+
+	switch(tag) {
+	case ACL_USER:
+		if (flags & ACL_TEXT_NUMERIC_IDS)
+			p = NULL;
+		else
+			p = getpwuid(id);
+		if (!p)
+			i = snprintf(buf, buf_len, "%d", id);
+		else
+			i = snprintf(buf, buf_len, "%s", p->pw_name);
+
+		if (i < 0) {
+			errno = ENOMEM;
+			return (-1);
+		}
+		return (0);
+
+	case ACL_GROUP:
+		if (flags & ACL_TEXT_NUMERIC_IDS)
+			g = NULL;
+		else
+			g = getgrgid(id);
+		if (g == NULL)
+			i = snprintf(buf, buf_len, "%d", id);
+		else
+			i = snprintf(buf, buf_len, "%s", g->gr_name);
+
+		if (i < 0) {
+			errno = ENOMEM;
+			return (-1);
+		}
+		return (0);
+
+	default:
+		return (EINVAL);
+	}
+}