os2: make high-memory safe

Some OS/2 APIs are not high-memory safe. So there are needs to use wrapper
functions to make them high-memory safe.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

include/vlc_common.h

@@ -409,6 +409,7 @@ typedef int ( * vlc_callback_t ) ( vlc_object_t *,      /* variable's object */
 #   define OS2EMX_PLAIN_CHAR
 #   define INCL_BASE
 #   define INCL_PM
+#   include <os2safe.h>
 #   include <os2.h>
 #endif
 

modules/access/vcd/cdrom.c

@@ -78,7 +78,63 @@
 #   include <sys/ioctl.h>
 #   include <linux/cdrom.h>
 #elif defined( __OS2__ )
+#   include <os2safe.h>
 #   include <os2.h>
+
+/*****************************************************************************
+ * vlc_DosDevIOCtl: high memory safe wrapper for DosDevIOCtl
+ *****************************************************************************
+ * Unfortunately, DosDevIOCtl() is not high memory safe API, and is not
+ * covered by os2safe.h. So define a wrapper function for it here.
+ *****************************************************************************/
+
+static APIRET vlc_DosDevIOCtl( HFILE hdevice, ULONG category, ULONG function,
+                               PVOID pParams, ULONG cbParamLenMax,
+                               PULONG pcbParamLen, PVOID pData,
+                               ULONG cbDataLenMax, PULONG pcbDataLen )
+{
+    PVOID pParamsLow = NULL;
+    PVOID pDataLow = NULL;
+    ULONG cbParamLenLow;
+    ULONG cbDataLenLow;
+
+    APIRET rc;
+
+    rc = DosAllocMem( &pParamsLow, cbParamLenMax, fALLOC );
+    if( rc )
+        goto exit_free;
+
+    rc = DosAllocMem( &pDataLow, cbDataLenMax, fALLOC );
+    if( rc )
+        goto exit_free;
+
+    memcpy( pParamsLow, pParams, cbParamLenMax );
+    memcpy( pDataLow, pData, cbDataLenMax );
+
+    cbParamLenLow = *pcbParamLen;
+    cbDataLenLow  = *pcbDataLen;
+
+    rc = DosDevIOCtl( hdevice, category, function, pParamsLow,
+                      cbParamLenMax, &cbParamLenLow, pDataLow, cbDataLenMax,
+                      &cbDataLenLow );
+
+    if( !rc )
+    {
+        memcpy( pParams, pParamsLow, cbParamLenMax );
+        memcpy( pData, pDataLow, cbDataLenMax );
+
+        *pcbParamLen = cbParamLenLow;
+        *pcbDataLen  = cbDataLenLow;
+    }
+
+exit_free:
+    DosFreeMem( pParamsLow);
+    DosFreeMem( pDataLow);
+
+    return rc;
+}
+
+#   define DosDevIOCtl vlc_DosDevIOCtl
 #else
 #   error FIXME
 #endif