[akhaldi] 63293: [CRT] * Update ungetc(). CORE-8080

Author: akhaldi
Date: Wed May 14 14:55:37 2014
New Revision: 63293
URL: http://svn.reactos.org/svn/reactos?rev=63293&view=rev
Log:
[CRT]
* Update ungetc().
CORE-8080
Modified:
    trunk/reactos/lib/sdk/crt/stdio/file.c
Modified: trunk/reactos/lib/sdk/crt/stdio/file.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/sdk/crt/stdio/file.c?r…
==============================================================================
--- trunk/reactos/lib/sdk/crt/stdio/file.c      [iso-8859-1] (original)
+++ trunk/reactos/lib/sdk/crt/stdio/file.c      [iso-8859-1] Wed May 14 14:55:37 2014
@@ -3880,13 +3880,19 @@
         return EOF;
     _lock_file(file);
-    if(file->_bufsiz == 0) {
-        alloc_buffer(file);
+    if(file->_bufsiz == 0 && alloc_buffer(file))
         file->_ptr++;
-    }
     if(file->_ptr>file->_base) {
         file->_ptr--;
-        *file->_ptr=c;
+        if(file->_flag & _IOSTRG) {
+            if(*file->_ptr != c) {
+                file->_ptr++;
+                _unlock_file(file);
+                return EOF;
+            }
+        }else {
+            *file->_ptr = c;
+        }
         file->_cnt++;
         clearerr(file);
         _unlock_file(file);