From 000dfda7f34171fc0596c0aa47dac3d0cc8d3bbc Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brauner@canonical.com>
Date: Sun, 6 Nov 2016 19:48:58 +0100
Subject: [PATCH] utils: add lxc_append_string()

lxc_append_string() appends strings without separator. This is mostly useful
for reading in whole files line-by-line.

Signed-off-by: Christian Brauner <christian.brauner@canonical.com>
---
 src/lxc/utils.c | 34 ++++++++++++++++++++++++++++++++++
 src/lxc/utils.h |  2 ++
 2 files changed, 36 insertions(+)

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index c912fe8f0..d6f8ecf03 100644
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -1930,3 +1930,37 @@ out:
 	fclose(f);
 	return bret;
 }
+
+static int lxc_append_null_to_list(void ***list)
+{
+	int newentry = 0;
+	void **tmp;
+
+	if (*list)
+		for (; (*list)[newentry]; newentry++) {
+			;
+		}
+
+	tmp = realloc(*list, (newentry + 2) * sizeof(void **));
+	if (!tmp)
+		return -1;
+
+	*list = tmp;
+	(*list)[newentry + 1] = NULL;
+
+	return newentry;
+}
+
+int lxc_append_string(char ***list, char *entry)
+{
+	int newentry = lxc_append_null_to_list((void ***)list);
+	char *copy;
+
+	copy = strdup(entry);
+	if (!copy)
+		return -1;
+
+	(*list)[newentry] = copy;
+
+	return 0;
+}
diff --git a/src/lxc/utils.h b/src/lxc/utils.h
index a0fa0e2a5..50e184712 100644
--- a/src/lxc/utils.h
+++ b/src/lxc/utils.h
@@ -258,6 +258,8 @@ extern char *lxc_append_paths(const char *first, const char *second);
 extern bool lxc_string_in_list(const char *needle, const char *haystack, char sep);
 extern char **lxc_string_split(const char *string, char sep);
 extern char **lxc_string_split_and_trim(const char *string, char sep);
+/* Append string to NULL-terminated string array. */
+extern int lxc_append_string(char ***list, char *entry);
 
 /* some simple array manipulation utilities */
 typedef void (*lxc_free_fn)(void *);