Tools: handle file opening failure

Most of the cases, a file handle (stdin/out) is opened without checking
for error. That operation may still fail, so check for it.

Change-Id: I30c3e7b40858acd8b1662622129bd6557722dccd
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/tools/moc/main.cpp b/src/tools/moc/main.cpp
index 3df832cc2e..bb51352519 100644
--- a/src/tools/moc/main.cpp
+++ b/src/tools/moc/main.cpp
@@ -449,11 +449,14 @@ int runMoc(int argc, char **argv)
 
     if (filename.isEmpty()) {
         filename = QStringLiteral("standard input");
-        in.open(stdin, QIODevice::ReadOnly);
+        if (!in.open(stdin, QIODevice::ReadOnly)) {
+            fprintf(stderr, "moc: cannot open standard input: %s\n", qPrintable(in.errorString()));
+            return 1;
+        }
     } else {
         in.setFileName(filename);
         if (!in.open(QIODevice::ReadOnly)) {
-            fprintf(stderr, "moc: %s: No such file\n", qPrintable(filename));
+            fprintf(stderr, "moc: cannot open %s: %s\n", qPrintable(filename), qPrintable(in.errorString()));
             return 1;
         }
         moc.filename = filename.toLocal8Bit();