mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-12-06 19:41:15 +01:00
Nick Mathewson
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* Copyright (c) 2003-2004, Roger Dingledine
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2019, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file win32err.c
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* \brief Convert windows error codes to useful C strings.
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**/
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#ifdef _WIN32
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#include "orconfig.h"
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#include "lib/log/win32err.h"
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#include "lib/malloc/malloc.h"
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#include <tchar.h>
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#include <windows.h>
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/** Return a newly allocated string describing the windows system error code
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* <b>err</b>. Note that error codes are different from errno. Error codes
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* come from GetLastError() when a winapi call fails. errno is set only when
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* ANSI functions fail. Whee. */
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char *
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format_win32_error(DWORD err)
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{
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TCHAR *str = NULL;
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char *result;
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DWORD n;
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/* Somebody once decided that this interface was better than strerror(). */
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n = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL, err,
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MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
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(LPVOID)&str,
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0, NULL);
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if (str && n) {
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#ifdef UNICODE
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size_t len;
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if (n > 128*1024)
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len = (128 * 1024) * 2 + 1; /* This shouldn't be possible, but let's
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* make sure. */
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else
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len = n * 2 + 1;
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result = tor_malloc(len);
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wcstombs(result,str,len);
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result[len-1] = '\0';
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#else /* !(defined(UNICODE)) */
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result = tor_strdup(str);
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#endif /* defined(UNICODE) */
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} else {
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result = tor_strdup("<unformattable error>");
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}
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if (str) {
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LocalFree(str); /* LocalFree != free() */
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}
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return result;
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}
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#endif /* defined(_WIN32) */
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