+ /* Try to do what strerror (errnum) does, but without clobbering the
+ buffer used by strerror(). */
+
+# if defined __NetBSD__ || defined __hpux || ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) /* NetBSD, HP-UX, native Win32 */
+
+ /* NetBSD: sys_nerr, sys_errlist are declared through _NETBSD_SOURCE
+ and <errno.h> above.
+ HP-UX: sys_nerr, sys_errlist are declared explicitly above.
+ native Win32: sys_nerr, sys_errlist are declared in <stdlib.h>. */
+ if (errnum >= 0 && errnum < sys_nerr)
+ {
+# if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
+ int saved_errno = errno;
+# if defined __NetBSD__
+ nl_catd catd = catopen ("libc", NL_CAT_LOCALE);
+ const char *errmsg =
+ (catd != (nl_catd)-1
+ ? catgets (catd, 1, errnum, sys_errlist[errnum])
+ : sys_errlist[errnum]);
+# endif
+# if defined __hpux
+ nl_catd catd = catopen ("perror", NL_CAT_LOCALE);
+ const char *errmsg =
+ (catd != (nl_catd)-1
+ ? catgets (catd, 1, 1 + errnum, sys_errlist[errnum])
+ : sys_errlist[errnum]);
+# endif
+# else
+ const char *errmsg = sys_errlist[errnum];
+# endif
+ if (errmsg == NULL || *errmsg == '\0')
+ ret = EINVAL;
+ else
+ {
+ size_t len = strlen (errmsg);
+
+ if (len < buflen)
+ {
+ memcpy (buf, errmsg, len + 1);
+ ret = 0;
+ }
+ else
+ ret = ERANGE;
+ }
+# if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
+ if (catd != (nl_catd)-1)
+ catclose (catd);
+ errno = saved_errno;
+# endif
+ }
+ else
+ ret = EINVAL;
+
+# elif defined __sgi || (defined __sun && !defined _LP64) /* IRIX, Solaris <= 9 32-bit */
+
+ /* For a valid error number, the system's strerror() function returns
+ a pointer to a not copied string, not to a buffer. */
+ if (errnum >= 0 && errnum < sys_nerr)
+ {
+ char *errmsg = strerror (errnum);
+
+ if (errmsg == NULL || *errmsg == '\0')
+ ret = EINVAL;
+ else
+ {
+ size_t len = strlen (errmsg);
+
+ if (len < buflen)
+ {
+ memcpy (buf, errmsg, len + 1);
+ ret = 0;
+ }
+ else
+ ret = ERANGE;
+ }
+ }
+ else
+ ret = EINVAL;
+
+# else
+