Fix [perl #37533] open pragma ignored for all 3-arg opens

Also, correct the documentation in open.pm that stated
that open() did not override open.pm-given default encodings.

p4raw-id: //depot/perl@25925

2 files changed, 6 insertions, 6 deletions

diff --git a/lib/open.pm b/lib/open.pm
index 35657623fa..24488e6716 100644
--- a/lib/open.pm
+++ b/lib/open.pm
@@ -2,7 +2,7 @@ package open;
 use warnings;
 $open::hint_bits = 0x20000; # HINT_LOCALIZE_HH
 
-our $VERSION = '1.04_01';
+our $VERSION = '1.05';
 
 require 5.008001; # for PerlIO::get_layers()
 
@@ -216,8 +216,8 @@ details and the list of supported locales.
 Note that C<:utf8> PerlIO layer must always be specified exactly like
 that, it is not subject to the loose matching of encoding names.
 
-When open() is given an explicit list of layers they are appended to
-the list declared using this pragma.
+When open() is given an explicit list of layers (with the three-arg
+syntax), they override the list declared using this pragma.
 
 The C<:std> subpragma on its own has no effect, but if combined with
 the C<:utf8> or C<:encoding> subpragmas, it converts the standard
@@ -229,7 +229,7 @@ chosen to be in C<< :encoding(koi8r) >>, a C<:std> will cause only the
 STDOUT and STDERR to be in C<koi8r>.  The C<:locale> subpragma
 implicitly turns on C<:std>.
 
-The logic of C<:locale> is described in full in L</encoding>,
+The logic of C<:locale> is described in full in L<encoding>,
 but in short it is first trying nl_langinfo(CODESET) and then
 guessing from the LC_ALL and LANG locale environment variables.
 
diff --git a/perlio.c b/perlio.c
index e9ea0c3a19..23df5e8374 100644
--- a/perlio.c
+++ b/perlio.c
@@ -1461,7 +1461,7 @@ PerlIO_resolve_layers(pTHX_ const char *layers,
 	     */
 	}
     }
-    if (!layers)
+    if (!layers || !*layers)
 	layers = PerlIO_context_layers(aTHX_ mode);
     if (layers && *layers) {
 	PerlIO_list_t *av;
@@ -1497,7 +1497,7 @@ PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
 {
     if (!f && narg == 1 && *args == &PL_sv_undef) {
 	if ((f = PerlIO_tmpfile())) {
-	    if (!layers)
+	    if (!layers || !*layers)
 		layers = PerlIO_context_layers(aTHX_ mode);
 	    if (layers && *layers)
 		PerlIO_apply_layers(aTHX_ f, mode, layers);