virstring: Introduce virStringListAdd

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

src/libvirt_private.syms

@@ -2460,6 +2460,7 @@ virStringEncodeBase64;
 virStringHasControlChars;
 virStringIsEmpty;
 virStringIsPrintable;
+virStringListAdd;
 virStringListFree;
 virStringListFreeCount;
 virStringListGetFirstWithPrefix;

src/util/virstring.c

@@ -168,6 +168,40 @@ char *virStringListJoin(const char **strings,
 }
 
 
+/**
+ * virStringListAdd:
+ * @strings: a NULL-terminated array of strings
+ * @item: string to add
+ *
+ * Creates new strings list with all strings duplicated and @item
+ * at the end of the list. Callers is responsible for freeing
+ * both @strings and returned list.
+ */
+char **
+virStringListAdd(const char **strings,
+                 const char *item)
+{
+    char **ret = NULL;
+    size_t i = virStringListLength(strings);
+
+    if (VIR_ALLOC_N(ret, i + 2) < 0)
+        goto error;
+
+    for (i = 0; strings && strings[i]; i++) {
+        if (VIR_STRDUP(ret[i], strings[i]) < 0)
+            goto error;
+    }
+
+    if (VIR_STRDUP(ret[i], item) < 0)
+        goto error;
+
+    return ret;
+ error:
+    virStringListFree(ret);
+    return NULL;
+}
+
+
 /**
  * virStringListFree:
  * @str_array: a NULL-terminated array of strings to free

src/util/virstring.h

@@ -41,6 +41,9 @@ char *virStringListJoin(const char **strings,
                         const char *delim)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
 
+char **virStringListAdd(const char **strings,
+                        const char *item);
+
 void virStringListFree(char **strings);
 void virStringListFreeCount(char **strings,
                             size_t count);

tests/virstringtest.c

@@ -122,6 +122,46 @@ static int testJoin(const void *args)
     return ret;
 }
 
+
+static int testAdd(const void *args)
+{
+    const struct testJoinData *data = args;
+    char **list = NULL;
+    char *got = NULL;
+    int ret = -1;
+    size_t i;
+
+    for (i = 0; data->tokens[i]; i++) {
+        char **tmp = virStringListAdd((const char **)list, data->tokens[i]);
+        if (!tmp)
+            goto cleanup;
+        virStringListFree(list);
+        list = tmp;
+        tmp = NULL;
+    }
+
+    if (!list &&
+        VIR_ALLOC(list) < 0)
+        goto cleanup;
+
+    if (!(got = virStringListJoin((const char **)list, data->delim))) {
+        VIR_DEBUG("Got no result");
+        goto cleanup;
+    }
+
+    if (STRNEQ(got, data->string)) {
+        virFilePrintf(stderr, "Mismatch '%s' vs '%s'\n", got, data->string);
+        goto cleanup;
+    }
+
+    ret = 0;
+ cleanup:
+    virStringListFree(list);
+    VIR_FREE(got);
+    return ret;
+}
+
+
 static bool fail;
 
 static const char *
@@ -594,6 +634,8 @@ mymain(void)
             ret = -1;                                                   \
         if (virTestRun("Join " #str, testJoin, &joinData) < 0)          \
             ret = -1;                                                   \
+        if (virTestRun("Add " #str, testAdd, &joinData) < 0)            \
+            ret = -1;                                                   \
     } while (0)
 
     const char *tokens1[] = { NULL };