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-rw-r--r--lib/getgr_nam_gid.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/getgr_nam_gid.c b/lib/getgr_nam_gid.c
new file mode 100644
index 0000000..fd0c217
--- /dev/null
+++ b/lib/getgr_nam_gid.c
@@ -0,0 +1,43 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <stdlib.h>
+#include <errno.h>
+#include <grp.h>
+#include "prototypes.h"
+
+/*
+ * getgr_nam_gid - Return a pointer to the group specified by a string.
+ * The string may be a valid GID or a valid groupname.
+ * If the group does not exist on the system, NULL is returned.
+ */
+extern /*@only@*//*@null@*/struct group *getgr_nam_gid (/*@null@*/const char *grname)
+{
+ char *end;
+ long long gid;
+
+ if (NULL == grname) {
+ return NULL;
+ }
+
+ errno = 0;
+ gid = strtoll(grname, &end, 10);
+ if ( ('\0' != *grname)
+ && ('\0' == *end)
+ && (0 == errno)
+ && (/*@+longintegral@*/gid == (gid_t)gid)/*@=longintegral@*/) {
+ return xgetgrgid (gid);
+ }
+ return xgetgrnam (grname);
+}
+