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/* Copyright (c) 2003-2004, Roger Dingledine
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2021, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file win32err.c
* \brief Convert windows error codes to useful C strings.
**/
#ifdef _WIN32
#include "orconfig.h"
#include "lib/log/win32err.h"
#include "lib/malloc/malloc.h"
#include <tchar.h>
#include <windows.h>
/** Return a newly allocated string describing the windows system error code
* <b>err</b>. Note that error codes are different from errno. Error codes
* come from GetLastError() when a winapi call fails. errno is set only when
* ANSI functions fail. Whee. */
char *
format_win32_error(DWORD err)
{
TCHAR *str = NULL;
char *result;
DWORD n;
/* Somebody once decided that this interface was better than strerror(). */
n = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, err,
MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
(LPVOID)&str,
0, NULL);
if (str && n) {
#ifdef UNICODE
size_t len;
if (n > 128*1024)
len = (128 * 1024) * 2 + 1; /* This shouldn't be possible, but let's
* make sure. */
else
len = n * 2 + 1;
result = tor_malloc(len);
wcstombs(result,str,len);
result[len-1] = '\0';
#else /* !defined(UNICODE) */
result = tor_strdup(str);
#endif /* defined(UNICODE) */
} else {
result = tor_strdup("<unformattable error>");
}
if (str) {
LocalFree(str); /* LocalFree != free() */
}
return result;
}
#endif /* defined(_WIN32) */
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