[PATCH v2 01/22] util: Introduce virStringListCopy

[Jiri Denemark <jdenemar@xxxxxxxxxx>]

The API makes a deep copy of a NULL-terminated string list.

Signed-off-by: Jiri Denemark <jdenemar@xxxxxxxxxx>
Reviewed-by: John Ferlan <jferlan@xxxxxxxxxx>
---

Notes:
    Version 2:
    - no change

 src/util/virstring.c | 37 +++++++++++++++++++++++++++++++++++++
 src/util/virstring.h |  3 +++
 2 files changed, 40 insertions(+)

diff --git a/src/util/virstring.c b/src/util/virstring.c
index 0288d1e677..820b282ac5 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -239,6 +239,43 @@ virStringListRemove(char ***strings,
 }
 
 
+/**
+ * virStringListCopy:
+ * @dst: where to store the copy of @strings
+ * @src: a NULL-terminated array of strings
+ *
+ * Makes a deep copy of the @src string list and stores it in @dst. Callers
+ * are responsible for freeing both @dst and @src.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int
+virStringListCopy(char ***dst,
+                  const char **src)
+{
+    char **copy = NULL;
+    size_t i;
+
+    if (!src)
+        return 0;
+
+    if (VIR_ALLOC_N(copy, virStringListLength(src) + 1) < 0)
+        goto error;
+
+    for (i = 0; src[i]; i++) {
+        if (VIR_STRDUP(copy[i], src[i]) < 0)
+            goto error;
+    }
+
+    *dst = copy;
+    return 0;
+
+ error:
+    virStringListFree(copy);
+    return -1;
+}
+
+
 /**
  * virStringListFree:
  * @str_array: a NULL-terminated array of strings to free
diff --git a/src/util/virstring.h b/src/util/virstring.h
index 1290fcce15..cfd91be314 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -46,6 +46,9 @@ char **virStringListAdd(const char **strings,
 void virStringListRemove(char ***strings,
                          const char *item);
 
+int virStringListCopy(char ***dst,
+                      const char **src);
+
 void virStringListFree(char **strings);
 void virStringListFreeCount(char **strings,
                             size_t count);
-- 
2.14.2

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