Implement guac_socket_write(), fix constness.

src/libguac/guacamole/socket.h

@@ -73,7 +73,7 @@ typedef ssize_t guac_socket_read_handler(guac_socket* socket,
  * @return The number of bytes written, or -1 if an error occurs.
  */
 typedef ssize_t guac_socket_write_handler(guac_socket* socket,
-        void* buf, size_t count);
+        const void* buf, size_t count);
 
 /**
  * Generic handler for socket select operations, similar to the POSIX select()
@@ -284,8 +284,8 @@ ssize_t guac_socket_write_string(guac_socket* socket, const char* str);
 ssize_t guac_socket_write_base64(guac_socket* socket, const void* buf, size_t count);
 
 /**
- * Writes the given data to the specified socket. The data written may be
- * buffered until the buffer is flushed automatically or manually.
+ * Writes the given data to the specified socket. The data written is not
+ * buffered, and will be sent immediately.
  *
  * If an error occurs while writing, a non-zero value is returned, and
  * guac_error is set appropriately.

src/libguac/socket-fd.c

@@ -81,7 +81,7 @@ ssize_t __guac_socket_fd_read_handler(guac_socket* socket,
 }
 
 ssize_t __guac_socket_fd_write_handler(guac_socket* socket,
-        void* buf, size_t count) {
+        const void* buf, size_t count) {
 
     __guac_socket_fd_data* data = (__guac_socket_fd_data*) socket->data;
     int retval;

src/libguac/socket-nest.c

@@ -69,7 +69,7 @@ typedef struct __guac_socket_nest_data {
 } __guac_socket_nest_data;
 
 ssize_t __guac_socket_nest_write_handler(guac_socket* socket,
-        void* buf, size_t count) {
+        const void* buf, size_t count) {
 
     __guac_socket_nest_data* data = (__guac_socket_nest_data*) socket->data;
     unsigned char* source = (unsigned char*) buf;

src/libguac/socket.c

@@ -64,8 +64,8 @@ char __guac_socket_BASE64_CHARACTERS[64] = {
     '8', '9', '+', '/'
 };
 
-ssize_t __guac_socket_write(guac_socket* socket,
-        void* buf, size_t count) {
+static ssize_t __guac_socket_write(guac_socket* socket,
+        const void* buf, size_t count) {
 
     /* If handler defined, call it. */
     if (socket->write_handler)
@@ -76,7 +76,28 @@ ssize_t __guac_socket_write(guac_socket* socket,
 
 }
 
-/* TODO: Implement guac_socket_write (buffered write) */
+ssize_t guac_socket_write(guac_socket* socket,
+        const void* buf, size_t count) {
+
+    const char* buffer = buf;
+
+    /* Write until completely written */
+    while (count > 0) {
+
+        /* Attempt to write, return on error */
+        int written = __guac_socket_write(socket, buffer, count);
+        if (written == -1)
+            return 1;
+
+        /* Advance buffer as data written */
+        buffer += written;
+        count  -= written;
+
+    }
+
+    return 0;
+
+}
 
 ssize_t guac_socket_read(guac_socket* socket, void* buf, size_t count) {