Add dup_string_list() utility function

2 files changed, 37 insertions, 0 deletions

diff --git a/src/util/util.c b/src/util/util.c
index 206984c7a..10bfb647b 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -237,7 +237,38 @@ fail:
     return NULL;
 }
 
+char **dup_string_list(TALLOC_CTX *memctx, const char **str_list)
+{
+    int i = 0;
+    int j = 0;
+    char **dup_list;
+
+    if (!str_list) {
+        return NULL;
+    }
+
+    /* Find the size of the list */
+    while (str_list[i]) i++;
+
+    dup_list = talloc_array(memctx, char *, i+1);
+    if (!dup_list) {
+        return NULL;
+    }
 
+    /* Copy the elements */
+    for (j = 0; j < i; j++) {
+        dup_list[j] = talloc_strdup(dup_list, str_list[j]);
+        if (!dup_list[j]) {
+            talloc_free(dup_list);
+            return NULL;
+        }
+    }
+
+    /* NULL-terminate the list */
+    dup_list[i] = NULL;
+
+    return dup_list;
+}
 
 /* Take two string lists (terminated on a NULL char*)
  * and return up to three arrays of strings based on
diff --git a/src/util/util.h b/src/util/util.h
index da92ae68c..6bcc9984d 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -332,6 +332,12 @@ int split_on_separator(TALLOC_CTX *mem_ctx, const char *str,
 
 char **parse_args(const char *str);
 
+
+/* Copy a NULL-terminated string list
+ * Returns NULL on out of memory error or invalid input
+ */
+char **dup_string_list(TALLOC_CTX *memctx, const char **str_list);
+
 /* Take two string lists (terminated on a NULL char*)
  * and return up to three arrays of strings based on
  * shared ownership.