-/* strerror.c --- ANSI C compatible system error routine
+/* strerror.c --- POSIX compatible system error routine
- Copyright (C) 1986, 1988, 1989, 1991, 2002, 2003, 2006, 2007 Free
- Software Foundation, Inc.
+ Copyright (C) 2007 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <config.h>
+#include <string.h>
+
#if REPLACE_STRERROR
-# include <string.h>
# include <stdio.h>
+# include "intprops.h"
+
# undef strerror
+# if ! HAVE_DECL_STRERROR
+# define strerror(n) NULL
+# endif
-char *rpl_strerror (int n)
+char *
+rpl_strerror (int n)
{
- static char const fmt[] = "Unknown error (%d)";
- static char mesg[sizeof fmt + sizeof n * CHAR_BIT / 3];
-
char *result = strerror (n);
- if (! result)
+ if (result == NULL || result[0] == '\0')
{
+ static char const fmt[] = "Unknown error (%d)";
+ static char mesg[sizeof fmt + INT_STRLEN_BOUND (n)];
sprintf (mesg, fmt, n);
return mesg;
}
- return result;
-}
-
-#elif !HAVE_STRERROR
-
-#include <limits.h>
-/* Don't include <stdio.h>, since it may or may not declare
- sys_errlist and its declarations may collide with ours. Just
- declare the stuff that we need directly. Standard hosted C89
- implementations define strerror and they don't need this strerror
- function, so take some liberties with the standard to cater to
- ancient or limited freestanding implementations. */
-int sprintf (char *, char const *, ...);
-extern int sys_nerr;
-extern char *sys_errlist[];
-
-char *
-strerror (int n)
-{
- static char const fmt[] = "Unknown error (%d)";
- static char mesg[sizeof fmt + sizeof n * CHAR_BIT / 3];
-
- if (n < 0 || n >= sys_nerr)
- {
- sprintf (mesg, fmt, n);
- return mesg;
- }
- else
- return sys_errlist[n];
+ return result;
}
-#else
-
-/* This declaration is solely to ensure that after preprocessing
- this file is never empty. */
-typedef int dummy;
-
#endif