[PATCH 4/8] virstring: Introduce virStringListRemove

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/libvirt_private.syms |  1 +
 src/util/virstring.c     | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/virstring.h     |  3 +++
 tests/virstringtest.c    | 38 ++++++++++++++++++++++++++++++++++++
 4 files changed, 92 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index bd46e5f..b1f42f2 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2465,6 +2465,7 @@ virStringListGetFirstWithPrefix;
 virStringListHasString;
 virStringListJoin;
 virStringListLength;
+virStringListRemove;
 virStringReplace;
 virStringSearch;
 virStringSortCompare;
diff --git a/src/util/virstring.c b/src/util/virstring.c
index d2fb543..7d2c4c7 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -206,6 +206,56 @@ virStringListAdd(const char **strings,
 
 
 /**
+ * virStringListRemove:
+ * @strings: a NULL-terminated array of strings
+ * @newStrings: new NULL-terminated array of strings
+ * @item: string to remove
+ *
+ * Creates new strings list with all strings duplicated except
+ * for every occurrence of @item. Callers is responsible for
+ * freeing both @strings and returned list.
+ *
+ * Returns the number of items in the new list (excluding NULL
+ * anchor), -1 on error.
+ */
+int
+virStringListRemove(const char **strings,
+                    char ***newStrings,
+                    const char *item)
+{
+    char **ret = NULL;
+    size_t i, j = 0;
+
+    for (i = 0; strings && strings[i]; i++) {
+        if (STRNEQ(strings[i], item))
+            j++;
+    }
+
+    if (!j) {
+        *newStrings = NULL;
+        return 0;
+    }
+
+    if (VIR_ALLOC_N(ret, j + 1) < 0)
+        goto error;
+
+    for (i = 0, j = 0; strings[i]; i++) {
+        if (STREQ(strings[i], item))
+            continue;
+        if (VIR_STRDUP(ret[j], strings[i]) < 0)
+            goto error;
+        j++;
+    }
+
+    *newStrings = ret;
+    return j;
+ error:
+    virStringListFree(ret);
+    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 da9d35c..88eacd4 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -43,6 +43,9 @@ char *virStringListJoin(const char **strings,
 
 char **virStringListAdd(const char **strings,
                         const char *item);
+int virStringListRemove(const char **strings,
+                        char ***newStrings,
+                        const char *item);
 
 void virStringListFree(char **strings);
 void virStringListFreeCount(char **strings,
diff --git a/tests/virstringtest.c b/tests/virstringtest.c
index 43657c8..a421f7b 100644
--- a/tests/virstringtest.c
+++ b/tests/virstringtest.c
@@ -162,6 +162,42 @@ static int testAdd(const void *args)
 }
 
 
+static int testRemove(const void *args)
+{
+    const struct testSplitData *data = args;
+    char **list = NULL;
+    size_t ntokens;
+    size_t i;
+    int ret = -1;
+
+    if (!(list = virStringSplitCount(data->string, data->delim,
+                                     data->max_tokens, &ntokens))) {
+        VIR_DEBUG("Got no tokens at all");
+        return -1;
+    }
+
+    for (i = 0; data->tokens[i]; i++) {
+        char **tmp;
+        if (virStringListRemove((const char **) list,
+                                &tmp, data->tokens[i]) < 0)
+            goto cleanup;
+        virStringListFree(list);
+        list = tmp;
+        tmp = NULL;
+    }
+
+    if (list && list[0]) {
+        virFilePrintf(stderr, "Not removed all tokens: %s", list[0]);
+        goto cleanup;
+    }
+
+    ret = 0;
+ cleanup:
+    virStringListFree(list);
+    return ret;
+}
+
+
 static bool fail;
 
 static const char *
@@ -636,6 +672,8 @@ mymain(void)
             ret = -1;                                                   \
         if (virTestRun("Add " #str, testAdd, &joinData) < 0)            \
             ret = -1;                                                   \
+        if (virTestRun("Remove " #str, testRemove, &splitData) < 0)     \
+            ret = -1;                                                   \
     } while (0)
 
     const char *tokens1[] = { NULL };
-- 
2.8.4

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