From a15604060010069bd16268306c0c1a1be144b771 Mon Sep 17 00:00:00 2001
From: Alexei Podtelezhnikov <apodtele@gmail.com>
Date: Tue, 5 Oct 2021 14:19:06 -0400
Subject: [PATCH] [builds/unix, builds/vms] Standardize `mmap` failure.

* builds/unix/ftsystem.c (FT_Stream_Open): Check for MAP_FAILED.
* builds/vms/ftsystem.c (FT_Stream_Open): Ditto.

This should cover https://savannah.nongnu.org/patch/?5909 as well.
---
 builds/unix/ftsystem.c | 3 +--
 builds/vms/ftsystem.c  | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/builds/unix/ftsystem.c b/builds/unix/ftsystem.c
index 7fc9941d8..81ed92858 100644
--- a/builds/unix/ftsystem.c
+++ b/builds/unix/ftsystem.c
@@ -313,8 +313,7 @@
                                           file,
                                           0 );
 
-    /* on some RTOS, mmap might return 0 */
-    if ( (long)stream->base != -1 && stream->base != NULL )
+    if ( stream->base != MAP_FAILED )
       stream->close = ft_close_stream_by_munmap;
     else
     {
diff --git a/builds/vms/ftsystem.c b/builds/vms/ftsystem.c
index 7e56873ba..31b08708f 100644
--- a/builds/vms/ftsystem.c
+++ b/builds/vms/ftsystem.c
@@ -246,7 +246,7 @@
                                           file,
                                           0 );
 
-    if ( (long)stream->base == -1 )
+    if ( stream->base == MAP_FAILED )
     {
       FT_ERROR(( "FT_Stream_Open:" ));
       FT_ERROR(( " could not `mmap' file `%s'\n", filepathname ));