msvcrt: Don't write to buffer in ungetc if _IOSTRG flag is specified.

ed2d53a3 · Piotr Caban · Alexandre Julliard · 6122c2ba · ed2d53a3
Commit ed2d53a3 authored Dec 30, 2013 by Piotr Caban Committed by Alexandre Julliard Dec 30, 2013
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file.c dlls/msvcrt/file.c +9 -1

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--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -4713,7 +4713,15 @@ int CDECL MSVCRT_ungetc(int c, MSVCRT_FILE * file)
        file->_ptr++;
    if(file->_ptr>file->_base) {
        file->_ptr--;
-        *file->_ptr=c;
+        if(file->_flag & MSVCRT__IOSTRG) {
+            if(*file->_ptr != c) {
+                file->_ptr++;
+                MSVCRT__unlock_file(file);
+                return MSVCRT_EOF;
+            }
+        }else {
+            *file->_ptr = c;
+        }
        file->_cnt++;
        MSVCRT_clearerr(file);
        MSVCRT__unlock_file(file);