In the wake of r7415, let's have some better error reporting.

[u/mdw/putty] / windows / winplink.c

diff --git a/windows/winplink.c b/windows/winplink.c
index 0819934..4242600 100644 (file)
--- a/windows/winplink.c
+++ b/windows/winplink.c
@@ -228,7 +228,13 @@ int stdin_gotdata(struct handle *h, void *data, int len)
        /*
         * Special case: report read error.
         */
-       fprintf(stderr, "Unable to read from standard input\n");
+       char buf[4096];
+       FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -len, 0,
+                     buf, lenof(buf), NULL);
+       buf[lenof(buf)-1] = '\0';
+       if (buf[strlen(buf)-1] == '\n')
+           buf[strlen(buf)-1] = '\0';
+       fprintf(stderr, "Unable to read from standard input: %s\n", buf);
        cleanup_exit(0);
     }
     noise_ultralight(len);
@@ -249,8 +255,14 @@ void stdouterr_sent(struct handle *h, int new_backlog)
        /*
         * Special case: report write error.
         */
-       fprintf(stderr, "Unable to write to standard %s\n",
-               (h == stdout_handle ? "output" : "error"));
+       char buf[4096];
+       FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -new_backlog, 0,
+                     buf, lenof(buf), NULL);
+       buf[lenof(buf)-1] = '\0';
+       if (buf[strlen(buf)-1] == '\n')
+           buf[strlen(buf)-1] = '\0';
+       fprintf(stderr, "Unable to write to standard %s: %s\n",
+               (h == stdout_handle ? "output" : "error"), buf);
        cleanup_exit(0);
     }
     if (connopen && back->connected(backhandle)) {