system: libdiskconfig: Add libdiskconfig

Change-Id: Ie7a7b5d8016dec60cdfb17228c3f519789c98564
Signed-off-by: San Mehat <san@google.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/libdiskconfig/write_lst.c b/libdiskconfig/write_lst.c
new file mode 100644
index 000000000..12b7cd775
--- /dev/null
+++ b/libdiskconfig/write_lst.c
@@ -0,0 +1,92 @@
+/* libs/diskconfig/write_lst.c
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "write_lst"
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <cutils/log.h>
+
+#include <diskconfig/diskconfig.h>
+
+struct write_list *
+alloc_wl(uint32_t data_len)
+{
+    struct write_list *item;
+
+    if (!(item = malloc(sizeof(struct write_list) + data_len))) {
+        LOGE("Unable to allocate memory.");
+        return NULL;
+    }
+
+    item->len = data_len;
+    return item;
+}
+
+void
+free_wl(struct write_list *item)
+{
+    if (item)
+        free(item);
+}
+
+struct write_list *
+wlist_add(struct write_list **lst, struct write_list *item)
+{
+    item->next = (*lst);
+    *lst = item;
+    return item;
+}
+
+void
+wlist_free(struct write_list *lst)
+{
+    struct write_list *temp_wr;
+    while (lst) {
+        temp_wr = lst->next;
+        free_wl(lst);
+        lst = temp_wr;
+    }
+}
+
+int
+wlist_commit(int fd, struct write_list *lst, int test)
+{
+    for(; lst; lst = lst->next) {
+        if (lseek64(fd, lst->offset, SEEK_SET) != (loff_t)lst->offset) {
+            LOGE("Cannot seek to the specified position (%lld).", lst->offset);
+            goto fail;
+        }
+
+        if (!test) {
+            if (write(fd, lst->data, lst->len) != (int)lst->len) {
+                LOGE("Failed writing %u bytes at position %lld.", lst->len,
+                     lst->offset);
+                goto fail;
+            }
+        } else
+            LOGI("Would write %d bytes @ offset %lld.", lst->len, lst->offset);
+    }
+
+    return 0;
+
+fail:
+    return -1;
+}