Avoid grave accent quoting in stderr diagnostics

A few Emacs diagnostics go directly to stderr, and so can't easily
contain curved quotes (as non-UTF-8 locales might mishandle them).
Instead of bothering to add support for this rarity, reword the
diagnostics so that they don't use grave accent to quote.
* src/alloc.c (mark_memory): Fix comment.
* src/buffer.c (init_buffer):
* src/dispnew.c (init_display):
* src/emacs.c (main, sort_args):
* src/lread.c (dir_warning):
* src/term.c (init_tty):
* src/unexmacosx.c (unexec):
* src/xfns.c (select_visual):
* src/xterm.c (cvt_string_to_pixel, x_io_error_quitter):
Reword stderr diagnostics to avoid quoting `like this'.
* src/unexmacosx.c: Include errno.h.
* src/xfns.c (select_visual): Encode value for locale.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/unexmacosx.c b/src/unexmacosx.c
index fe6637e2ef5..319ec7956e5 100644
--- a/src/unexmacosx.c
+++ b/src/unexmacosx.c
@@ -99,6 +99,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "unexec.h"
 #include "lisp.h"
 
+#include <errno.h>
 #include <stdio.h>
 #include <fcntl.h>
 #include <stdarg.h>
@@ -1264,14 +1265,14 @@ unexec (const char *outfile, const char *infile)
   infd = emacs_open (infile, O_RDONLY, 0);
   if (infd < 0)
     {
-      unexec_error ("cannot open input file `%s'", infile);
+      unexec_error ("%s: %s", infile, strerror (errno));
     }
 
   outfd = emacs_open (outfile, O_WRONLY | O_TRUNC | O_CREAT, 0777);
   if (outfd < 0)
     {
       emacs_close (infd);
-      unexec_error ("cannot open output file `%s'", outfile);
+      unexec_error ("%s: %s", outfile, strerror (errno));
     }
 
   build_region_list ();