Changes in uspace/srv/devman/util.c [791f58c:dc87f3fd] in mainline

File:

• uspace/srv/devman/util.c (modified) (1 diff)

uspace/srv/devman/util.c

@@ -111 +111 @@
 }
 
+ssize_t safe_read(int fd, void *buffer, size_t size)
+{
+        if (size == 0) {
+                return 0;
+        }
+
+        uint8_t *buf_ptr = (uint8_t *) buffer;
+
+        size_t total_read = 0;
+        while (total_read < size) {
+                ssize_t bytes_read = read(fd, buf_ptr, size - total_read);
+                if (bytes_read < 0) {
+                        /* Error. */
+                        return bytes_read;
+                } else if (bytes_read == 0) {
+                        /* Possibly end of file. */
+                        break;
+                } else {
+                        /* Read at least something. */
+                        buf_ptr += bytes_read;
+                        total_read += bytes_read;
+                }
+        }
+
+        return (ssize_t) total_read;
+}
+
 /** @}
  */