Changeset 8aa42e3 in mainline for uspace/lib/libc/generic/async.c

Timestamp:

2009-12-13T15:07:21Z (14 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

531695f

Parents:

1e4cada

Message:

add two convenient functions for transfering data

File:

• uspace/lib/libc/generic/async.c (modified) (1 diff)

uspace/lib/libc/generic/async.c

@@ -1345 +1345 @@
 }
 
+/** Wrapper for receiving blobs via the async_data_write_*
+ *
+ * This wrapper only makes it more comfortable to use async_data_write_*
+ * functions to receive blobs.
+ *
+ * @param blob     Pointer to data pointer (which should be later disposed
+ *                 by free()). If the operation fails, the pointer is not
+ *                 touched.
+ * @param max_size Maximum size (in bytes) of the blob to receive. 0 means
+ *                 no limit.
+ * @param received If not NULL, the size of the received data is stored here.
+ *
+ * @return Zero on success or a value from @ref errno.h on failure.
+ *
+ */
+int async_data_blob_receive(char **blob, const size_t max_size, size_t *received)
+{
+        ipc_callid_t callid;
+        size_t size;
+        if (!async_data_write_receive(&callid, &size)) {
+                ipc_answer_0(callid, EINVAL);
+                return EINVAL;
+        }
+        
+        if ((max_size > 0) && (size > max_size)) {
+                ipc_answer_0(callid, EINVAL);
+                return EINVAL;
+        }
+        
+        char *data = (char *) malloc(size);
+        if (data == NULL) {
+                ipc_answer_0(callid, ENOMEM);
+                return ENOMEM;
+        }
+        
+        int rc = async_data_write_finalize(callid, data, size);
+        if (rc != EOK) {
+                free(data);
+                return rc;
+        }
+        
+        *blob = data;
+        if (received != NULL)
+                *received = size;
+        
+        return EOK;
+}
+
+/** Wrapper for receiving strings via the async_data_write_*
+ *
+ * This wrapper only makes it more comfortable to use async_data_write_*
+ * functions to receive strings.
+ *
+ * @param str      Pointer to string pointer (which should be later disposed
+ *                 by free()). If the operation fails, the pointer is not
+ *                 touched.
+ * @param max_size Maximum size (in bytes) of the string to receive. 0 means
+ *                 no limit.
+ *
+ * @return Zero on success or a value from @ref errno.h on failure.
+ *
+ */
+int async_data_string_receive(char **str, const size_t max_size)
+{
+        ipc_callid_t callid;
+        size_t size;
+        if (!async_data_write_receive(&callid, &size)) {
+                ipc_answer_0(callid, EINVAL);
+                return EINVAL;
+        }
+        
+        if ((max_size > 0) && (size > max_size)) {
+                ipc_answer_0(callid, EINVAL);
+                return EINVAL;
+        }
+        
+        char *data = (char *) malloc(size + 1);
+        if (data == NULL) {
+                ipc_answer_0(callid, ENOMEM);
+                return ENOMEM;
+        }
+        
+        int rc = async_data_write_finalize(callid, data, size);
+        if (rc != EOK) {
+                free(data);
+                return rc;
+        }
+        
+        data[size] = 0;
+        *str = data;
+        return EOK;
+}
+
 /** @}
  */