bk commit into 5.0 tree (gkodinov:1.2525) BUG#29469

[kgeorge]

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ChangeSet@stripped, 2007-07-10 10:43:12+03:00, gkodinov@stripped +2 -0
  Bug #29469: Client dies if a query is issued after hitting Ctrl + C
  The Ctrl-C handler in mysql closes the console while ReadConsole()
  waits for console input.
  But the main thread was detecting that ReadConsole() haven't read 
  anything and was processing as if there're data in the buffer.
  Fixed to handle correctly this error condition.
  No test case added as the test relies on Ctrl-C sent to the client
  from its console.

  client/mysql.cc@stripped, 2007-07-10 10:43:10+03:00, gkodinov@stripped +6 -1
    Bug #29469: handle correctly console read error

  mysys/my_conio.c@stripped, 2007-07-10 10:43:10+03:00, gkodinov@stripped +5 -2
    Bug #29469: 
     1. handle correctly console read error
     2. add boundry checks for console buffer.

diff -Nrup a/client/mysql.cc b/client/mysql.cc
--- a/client/mysql.cc	2007-04-23 17:21:59 +03:00
+++ b/client/mysql.cc	2007-07-10 10:43:10 +03:00
@@ -1086,7 +1086,12 @@ static int read_and_execute(bool interac
            something else is still in console input buffer
         */
       } while (tmpbuf.alloced_length() <= clen);
-      line= buffer.c_ptr();
+      /* 
+        An empty line is returned from my_cgets when there's error reading :
+        Ctrl-c for example
+      */
+      if (line)
+        line= buffer.c_ptr();
 #else /* OS2 */
       buffer.length(0);
       /* _cgets() expects the buffer size - 3 as the first byte */
diff -Nrup a/mysys/my_conio.c b/mysys/my_conio.c
--- a/mysys/my_conio.c	2006-12-23 21:04:07 +02:00
+++ b/mysys/my_conio.c	2007-07-10 10:43:10 +03:00
@@ -184,16 +184,19 @@ char* my_cgets(char *buffer, unsigned lo
   }
   while (GetLastError() == ERROR_NOT_ENOUGH_MEMORY);
 
+  /* We go here on error reading the string (Ctrl-C for example) */
+  if (!*plen)
+    result= NULL;                              /* purecov: inspected */
 
   if (result != NULL)
   {
-    if (buffer[*plen - 2] == '\r')
+    if (*plen > 1 && buffer[*plen - 2] == '\r')
     {
       *plen= *plen - 2;
     }
     else 
     {
-      if (buffer[*plen - 1] == '\r')
+      if (*plen > 0 && buffer[*plen - 1] == '\r')
       {
         char tmp[3];
         int  tmplen= sizeof(tmp);