[newlib-cygwin] newlib: [w]scanf: Fix behaviour on matching failure

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=1bbdb3c9533684282695e147d0480b771fd13687

commit 1bbdb3c9533684282695e147d0480b771fd13687
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Wed Nov 29 15:01:30 2017 +0100

    newlib: [w]scanf: Fix behaviour on matching failure
    
    The special handling of %\0 in [w]scanf is flawed.  It's just a
    matching failure and should be handled as such.  scanf also
    fakes an int input value on %X with X being an invalid conversion
    char.  This is also just a matching failure and should be handled
    the same way as %\0.
    
    There's no indication of the reason for this "disgusting
    backwards compatibility hacks" in the logs, given this
    code made it into newlib before setting up the CVS repo.
    
    Just handle these cases identically as matching failures.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/libc/stdio/vfscanf.c  | 16 ++--------------
 newlib/libc/stdio/vfwscanf.c |  9 +--------
 2 files changed, 3 insertions(+), 22 deletions(-)

diff --git a/newlib/libc/stdio/vfscanf.c b/newlib/libc/stdio/vfscanf.c
index 544d8db..c5fcae5 100644
--- a/newlib/libc/stdio/vfscanf.c
+++ b/newlib/libc/stdio/vfscanf.c
@@ -787,20 +787,8 @@ _DEFUN(__SVFSCANF_R, (rptr, fp, fmt0, ap),
 	    }
 	  continue;
 
-	  /*
-	   * Disgusting backwards compatibility hacks.	XXX
-	   */
-	case '\0':		/* compat */
-	  _newlib_flockfile_exit (fp);
-	  return EOF;
-
-	default:		/* compat */
-	  if (isupper (c))
-	    flags |= LONG;
-	  c = CT_INT;
-	  ccfn = (u_long (*)CCFN_PARAMS)_strtol_r;
-	  base = 10;
-	  break;
+	default:
+	  goto match_failure;
 	}
 
       /*
diff --git a/newlib/libc/stdio/vfwscanf.c b/newlib/libc/stdio/vfwscanf.c
index 5b35601..fd4f1f9 100644
--- a/newlib/libc/stdio/vfwscanf.c
+++ b/newlib/libc/stdio/vfwscanf.c
@@ -740,14 +740,7 @@ _DEFUN(__SVFWSCANF_R, (rptr, fp, fmt0, ap),
 	    }
 	  continue;
 
-	  /*
-	   * Disgusting backwards compatibility hacks.	XXX
-	   */
-	case L'\0':		/* compat */
-	  _newlib_flockfile_exit (fp);
-	  return EOF;
-
-	default:		/* compat */
+	default:
 	  goto match_failure;
 	}