tor-browser

The Tor Browser
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XPCException.cpp (2042B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 /* An implementaion of nsIException. */
      8 
      9 #include "xpcprivate.h"
     10 #include "nsError.h"
     11 
     12 /***************************************************************************/
     13 /* Quick and dirty mapping of well known result codes to strings. We only
     14 *  call this when building an exception object, so iterating the short array
     15 *  is not too bad.
     16 *
     17 *  It sure would be nice to have exceptions declared in idl and available
     18 *  in some more global way at runtime.
     19 */
     20 
     21 static const struct ResultMap {
     22  nsresult rv;
     23  const char* name;
     24  const char* format;
     25 } map[] = {
     26 #define XPC_MSG_DEF(val, format) {(val), #val, format},
     27 #include "xpc.msg"
     28 #undef XPC_MSG_DEF
     29    {NS_OK, 0, 0}  // sentinel to mark end of array
     30 };
     31 
     32 #define RESULT_COUNT (std::size(map) - 1)
     33 
     34 // static
     35 bool nsXPCException::NameAndFormatForNSResult(nsresult rv, const char** name,
     36                                              const char** format) {
     37  for (const ResultMap* p = map; p->name; p++) {
     38    if (rv == p->rv) {
     39      if (name) *name = p->name;
     40      if (format) *format = p->format;
     41      return true;
     42    }
     43  }
     44  return false;
     45 }
     46 
     47 // static
     48 const void* nsXPCException::IterateNSResults(nsresult* rv, const char** name,
     49                                             const char** format,
     50                                             const void** iterp) {
     51  const ResultMap* p = (const ResultMap*)*iterp;
     52  if (!p) {
     53    p = map;
     54  } else {
     55    p++;
     56  }
     57  if (!p->name) {
     58    p = nullptr;
     59  } else {
     60    if (rv) {
     61      *rv = p->rv;
     62    }
     63    if (name) {
     64      *name = p->name;
     65    }
     66    if (format) {
     67      *format = p->format;
     68    }
     69  }
     70  *iterp = p;
     71  return p;
     72 }
     73 
     74 // static
     75 uint32_t nsXPCException::GetNSResultCount() { return RESULT_COUNT; }