Use a better buffer size in emacs_perror

* src/sysdep.c (emacs_perror): Since the buffer is for avoiding
interleaving, size it via PIPE_BUF not BUFSIZ.
* src/sysstdio.h (PIPE_BUF): Provide a default.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/sysdep.c b/src/sysdep.c
index 4c3d546962c..9301405943b 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -2711,10 +2711,10 @@ emacs_perror (char const *message)
                          ? initial_argv[0] : "emacs");
   /* Write it out all at once, if it's short; this is less likely to
      be interleaved with other output.  */
-  char buf[BUFSIZ];
+  char buf[min (PIPE_BUF, MAX_ALLOCA)];
   int nbytes = snprintf (buf, sizeof buf, "%s: %s: %s\n",
                          command, message, error_string);
-  if (0 <= nbytes && nbytes < BUFSIZ)
+  if (0 <= nbytes && nbytes < sizeof buf)
     emacs_write (STDERR_FILENO, buf, nbytes);
   else
     {