fixes to edify and updater script

A few more changes to edify:

  - fix write_raw_image(); my last change neglected to close the write
    context, so the written image was corrupt.

  - each expression tracks the span of the source code from which it
    was compiled, so that assert()'s error message can include the
    source of the expression that failed.

  - the 'cookie' argument to each Function is replaced with a State
    object, which contains the cookie, the source script (for use with
    the above spans), and the current error message (replacing the
    global variables that were used for this purpose).

  - in the recovery image, a new command "ui_print" can be sent back
    through the command pipe to cause text to appear on the screen.
    Add a new ui_print() function to print things from scripts.
    Rename existing "print" function to "stdout".

1 files changed, 10 insertions, 0 deletions

diff --git a/install.c b/install.c
index cca9400..c2e1385 100644
--- a/install.c
+++ b/install.c
@@ -196,6 +196,9 @@ try_update_binary(const char *path, ZipArchive *zip) {
     //            arrange to install the contents of <filename> in the
     //            given partition on reboot.
     //
+    //        ui_print <string>
+    //            display <string> on the screen.
+    //
     //   - the name of the package zip file.
     //
 
@@ -248,6 +251,13 @@ try_update_binary(const char *path, ZipArchive *zip) {
                     firmware_filename = strdup(filename);
                 }
             }
+        } else if (strcmp(command, "ui_print") == 0) {
+            char* str = strtok(NULL, "\n");
+            if (str) {
+                ui_print(str);
+            } else {
+                ui_print("\n");
+            }
         } else {
             LOGE("unknown command [%s]\n", command);
         }