Dynamically resize buffer as needed

reactos/apps/utils/pnpdump

diff -u -r1.8 -r1.9
--- pnpdump.c	25 Dec 2004 11:22:36 -0000	1.8
+++ pnpdump.c	26 Dec 2004 23:31:00 -0000	1.9
@@ -706,7 +706,7 @@

     }
 
   /* Allocate buffer */

-  dwSize = 1024;

+  dwSize = 2048;

   lpBuffer = malloc(dwSize);
   if (lpBuffer == NULL)
     {

@@ -715,19 +715,28 @@

       return 0;
     }
 

-  lError = RegQueryValueEx(hPnpKey,
-			   "Configuration Data",
-			   NULL,
-			   &dwType,
-			   (LPBYTE)lpBuffer,
-			   &dwSize);
-  if (lError != ERROR_SUCCESS)

+  do

     {

+      lError = RegQueryValueEx(hPnpKey,
+			       "Configuration Data",
+			       NULL,
+			       &dwType,
+			       (LPBYTE)lpBuffer,
+			       &dwSize);

       if (lError == ERROR_MORE_DATA)

-	{
-	  printf("Need to resize buffer to %lu\n", dwSize);
-	}
-

+        {
+          lpBuffer = realloc(lpBuffer, dwSize);
+          if (lpBuffer == NULL)
+            {
+              printf("Error: realloc() of %u bytes failed\n", (unsigned) dwSize);
+              RegCloseKey(hPnpKey);
+              return 0;
+            }
+        }
+    }
+  while (lError == ERROR_MORE_DATA);
+  if (lError != ERROR_SUCCESS)
+    {

       printf("Failed to read 'Configuration Data' value\n");
       free(lpBuffer);
       RegCloseKey(hPnpKey);