1 files changed, 118 insertions, 0 deletions
diff --git a/lib/groupmem.c b/lib/groupmem.c
new file mode 100644
index 0000000..c858b72
--- /dev/null
+++ b/lib/groupmem.c
@@ -0,0 +1,118 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2013, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include "groupio.h"
+
+/*@null@*/ /*@only@*/struct group *__gr_dup (const struct group *grent)
+{
+	struct group *gr;
+	int i;
+
+	gr = (struct group *) malloc (sizeof *gr);
+	if (NULL == gr) {
+		return NULL;
+	}
+	/* The libc might define other fields. They won't be copied. */
+	memset (gr, 0, sizeof *gr);
+	gr->gr_gid = grent->gr_gid;
+	/*@-mustfreeonly@*/
+	gr->gr_name = strdup (grent->gr_name);
+	/*@=mustfreeonly@*/
+	if (NULL == gr->gr_name) {
+		gr_free(gr);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	gr->gr_passwd = strdup (grent->gr_passwd);
+	/*@=mustfreeonly@*/
+	if (NULL == gr->gr_passwd) {
+		gr_free(gr);
+		return NULL;
+	}
+
+	for (i = 0; grent->gr_mem[i]; i++);
+
+	/*@-mustfreeonly@*/
+	gr->gr_mem = (char **) malloc ((i + 1) * sizeof (char *));
+	/*@=mustfreeonly@*/
+	if (NULL == gr->gr_mem) {
+		gr_free(gr);
+		return NULL;
+	}
+	for (i = 0; grent->gr_mem[i]; i++) {
+		gr->gr_mem[i] = strdup (grent->gr_mem[i]);
+		if (NULL == gr->gr_mem[i]) {
+			gr_free(gr);
+			return NULL;
+		}
+	}
+	gr->gr_mem[i] = NULL;
+
+	return gr;
+}
+
+void gr_free_members (struct group *grent)
+{
+	if (NULL != grent->gr_mem) {
+		size_t i;
+		for (i = 0; NULL != grent->gr_mem[i]; i++) {
+			free (grent->gr_mem[i]);
+		}
+		free (grent->gr_mem);
+		grent->gr_mem = NULL;
+	}
+}
+
+void gr_free (/*@out@*/ /*@only@*/struct group *grent)
+{
+	free (grent->gr_name);
+	if (NULL != grent->gr_passwd) {
+		strzero (grent->gr_passwd);
+		free (grent->gr_passwd);
+	}
+	gr_free_members(grent);
+	free (grent);
+}
+
+bool gr_append_member(struct group *grp, char *member)
+{
+	int i;
+
+	if (NULL == grp->gr_mem || grp->gr_mem[0] == NULL) {
+		grp->gr_mem = (char **)malloc(2 * sizeof(char *));
+		if (!grp->gr_mem) {
+			return false;
+		}
+		grp->gr_mem[0] = strdup(member);
+		if (!grp->gr_mem[0]) {
+			return false;
+		}
+		grp->gr_mem[1] = NULL;
+		return true;
+	}
+
+	for (i = 0; grp->gr_mem[i]; i++) ;
+	grp->gr_mem = realloc(grp->gr_mem, (i + 2) * sizeof(char *));
+	if (NULL == grp->gr_mem) {
+		return false;
+	}
+	grp->gr_mem[i] = strdup(member);
+	if (NULL == grp->gr_mem[i]) {
+		return false;
+	}
+	grp->gr_mem[i + 1] = NULL;
+	return true;
+}