tor  0.4.1.0-alpha-dev
win32err.c
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1 /* Copyright (c) 2003-2004, Roger Dingledine
2  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
3  * Copyright (c) 2007-2019, The Tor Project, Inc. */
4 /* See LICENSE for licensing information */
5 
11 #ifdef _WIN32
12 #include "orconfig.h"
13 #include "lib/log/win32err.h"
14 #include "lib/malloc/malloc.h"
15 
16 #include <tchar.h>
17 #include <windows.h>
18 
23 char *
24 format_win32_error(DWORD err)
25 {
26  TCHAR *str = NULL;
27  char *result;
28  DWORD n;
29 
30  /* Somebody once decided that this interface was better than strerror(). */
31  n = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
32  FORMAT_MESSAGE_FROM_SYSTEM |
33  FORMAT_MESSAGE_IGNORE_INSERTS,
34  NULL, err,
35  MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
36  (LPVOID)&str,
37  0, NULL);
38 
39  if (str && n) {
40 #ifdef UNICODE
41  size_t len;
42  if (n > 128*1024)
43  len = (128 * 1024) * 2 + 1; /* This shouldn't be possible, but let's
44  * make sure. */
45  else
46  len = n * 2 + 1;
47  result = tor_malloc(len);
48  wcstombs(result,str,len);
49  result[len-1] = '\0';
50 #else /* !(defined(UNICODE)) */
51  result = tor_strdup(str);
52 #endif /* defined(UNICODE) */
53  } else {
54  result = tor_strdup("<unformattable error>");
55  }
56  if (str) {
57  LocalFree(str); /* LocalFree != free() */
58  }
59  return result;
60 }
61 #endif /* defined(_WIN32) */
Header for win32err.c.
Headers for util_malloc.c.