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diff --git a/gdb/posix-hdep.c b/gdb/posix-hdep.c
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+/* Host support routines for MinGW, for GDB, the GNU debugger.
+
+ Copyright (C) 2006
+ Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+#include "defs.h"
+
+#include "gdb_string.h"
+
+/* The strerror() function can return NULL for errno values that are
+ out of range. Provide a "safe" version that always returns a
+ printable string. */
+
+char *
+safe_strerror (int errnum)
+{
+ char *msg;
+
+ msg = strerror (errnum);
+ if (msg == NULL)
+ {
+ static char buf[32];
+ xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum);
+ msg = buf;
+ }
+ return (msg);
+}
+