[newlib-cygwin] cygheap_pwdgrp: Handle invalid db_* entries correctly

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=5951b3e600f32fd1d96b73f4ccf05d081a5d9428

commit 5951b3e600f32fd1d96b73f4ccf05d081a5d9428
Author: David Macek via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Thu Apr 16 23:09:07 2020 +0200

    cygheap_pwdgrp: Handle invalid db_* entries correctly
    
    If the first scheme in db_* was invalid, the code would think there
    were no schemes specified and replace the second scheme with
    NSS_SCHEME_DESC.
    
    Signed-off-by: David Macek <david.macek.0@gmail.com>

Diff:
---
 winsup/cygwin/uinfo.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/uinfo.cc b/winsup/cygwin/uinfo.cc
index 2d5de359b..57d90189d 100644
--- a/winsup/cygwin/uinfo.cc
+++ b/winsup/cygwin/uinfo.cc
@@ -823,7 +823,10 @@ cygheap_pwdgrp::nss_init_line (const char *line)
 					  c, e - c);
 		    }
 		  else
-		    debug_printf ("Invalid nsswitch.conf content: %s", line);
+		    {
+		      debug_printf ("Invalid nsswitch.conf content: %s", line);
+		      --idx;
+		    }
 		  c += strcspn (c, " \t");
 		  c += strspn (c, " \t");
 		  ++idx;