[reactos] 02/02: [USETUP] Minor improvements when initializing the console.

[Hermès Bélusca-Maïto]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=0abff65a5520d6e926d364...

commit 0abff65a5520d6e926d364edc6df6e10f2b46155
Author:     Hermès Bélusca-Maïto [e-mail]
AuthorDate: Sun Jan 3 00:10:03 2021 +0100
Commit:     Hermès Bélusca-Maïto [e-mail]
CommitDate: Sun Jan 3 00:27:54 2021 +0100

[USETUP] Minor improvements when initializing the console.

- Use NT values for uninitialized handle values.
    - Cache the STD_INPUT_HANDLE.
    - Free the console if GetConsoleScreenBufferInfo() fails in CONSOLE_Init().
---
 base/setup/usetup/consup.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/base/setup/usetup/consup.c b/base/setup/usetup/consup.c
index 2a5336cb5e5..e72c43106e6 100644
--- a/base/setup/usetup/consup.c
+++ b/base/setup/usetup/consup.c
@@ -33,8 +33,8 @@

/* GLOBALS ******************************************************************/

-HANDLE StdInput  = INVALID_HANDLE_VALUE;
-HANDLE StdOutput = INVALID_HANDLE_VALUE;
+HANDLE StdInput  = NULL;
+HANDLE StdOutput = NULL;

SHORT xScreen = 0;
 SHORT yScreen = 0;
@@ -45,15 +45,24 @@ BOOLEAN
 CONSOLE_Init(VOID)
 {
     CONSOLE_SCREEN_BUFFER_INFO csbi;
+
+    /* Allocate a new console */
     if (!AllocConsole())
         return FALSE;

-    StdInput = GetStdHandle(STD_INPUT_HANDLE);
+    /* Get the standard handles */
+    StdInput  = GetStdHandle(STD_INPUT_HANDLE);
     StdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
+
+    /* Retrieve the size of the console */
     if (!GetConsoleScreenBufferInfo(StdOutput, &csbi))
+    {
+        FreeConsole();
         return FALSE;
+    }
     xScreen = csbi.dwSize.X;
     yScreen = csbi.dwSize.Y;
+
     return TRUE;
 }

@@ -175,7 +184,7 @@ CONSOLE_GetCursorXY(
 {
     CONSOLE_SCREEN_BUFFER_INFO csbi;

-    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
+    GetConsoleScreenBufferInfo(StdOutput, &csbi);

*x = csbi.dwCursorPosition.X;
     *y = csbi.dwCursorPosition.Y;