utils/wverror.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
   4  *
   5  * A class for managing error numbers and strings.  See wverror.h.
   6  */
   7 #include "wverror.h"
   8 #include <assert.h>
   9
  10 #ifdef _WIN32
  11 #include "windows.h"
  12
  13 struct WvErrMap {
  14     int num;
  15     const char *str;
  16 };
  17
  18 static WvErrMap wverrmap[] = {
  19     { WSAEINTR, "Interrupted" },
  20     { WSAEBADF, "Bad file descriptor" },
  21     { WSAEACCES, "Access denied" },
  22     { WSAEFAULT, "Bad address" },
  23     { WSAEINVAL, "Invalid argument" },
  24     { WSAEMFILE, "Too many open files" },
  25     { WSAEWOULDBLOCK, "Operation would block" },
  26     { WSAEINPROGRESS, "Operation now in progress" },
  27     { WSAEALREADY, "Operation already in progress" },
  28     { WSAENOTSOCK, "Socket operation on non-socket" },
  29     { WSAEDESTADDRREQ, "Destination address required" },
  30     { WSAEMSGSIZE, "Message too long" },
  31     { WSAEPROTOTYPE, "Protocol wrong type for socket" },
  32     { WSAENOPROTOOPT, "Protocol not available" },
  33     { WSAEPROTONOSUPPORT, "Protocol not supported" },
  34     { WSAESOCKTNOSUPPORT, "Socket type not supported" },
  35     { WSAEOPNOTSUPP, "Operation not supported on transport endpoint" },
  36     { WSAEPFNOSUPPORT, "Protocol family not supported" },
  37     { WSAEAFNOSUPPORT, "Address family not supported by protocol" },
  38     { WSAEADDRINUSE, "Address already in use" },
  39     { WSAEADDRNOTAVAIL, "Cannot assign requested address" },
  40     { WSAENETDOWN, "Network is down" },
  41     { WSAENETUNREACH, "Network is unreachable" },
  42     { WSAENETRESET, "Network dropped connection because of reset" },
  43     { WSAECONNABORTED, "Software caused connection abort" },
  44     { WSAECONNRESET, "Connection reset by peer" },
  45     { WSAENOBUFS, "No buffer space available" },
  46     { WSAEISCONN, "Transport endpoint is already connected" },
  47     { WSAENOTCONN, "Transport endpoint is not connected" },
  48     { WSAESHUTDOWN, "Cannot send after transport endpoint shutdown" },
  49     { WSAETOOMANYREFS, "Too many references: cannot splice" },
  50     { WSAETIMEDOUT, "Connection timed out" },
  51     { WSAECONNREFUSED, "Connection refused" },
  52     { WSAELOOP, "Too many symbolic links encountered" },
  53     { WSAENAMETOOLONG, "File name too long" },
  54     { WSAEHOSTDOWN, "Host is down" },
  55     { WSAEHOSTUNREACH, "No route to host" },
  56     { WSAENOTEMPTY, "Directory not empty" },
  57     { WSAEPROCLIM, "Process limit reached" },
  58     { WSAEUSERS, "Too many users" },
  59     { WSAEDQUOT, "Disk quota exceeded" },
  60     { WSAESTALE, "Stale file handle" },
  61     { WSAEREMOTE, "Object is remote" },
  62     { WSAEDISCON, "Disconnected" },
  63     { WSAENOMORE, "No more data" },
  64     { WSAECANCELLED, "Operation cancelled" },
  65     { WSAEINVALIDPROCTABLE, "Invalid process table" },
  66     { WSAEINVALIDPROVIDER, "Invalid provider" },
  67     { WSAEPROVIDERFAILEDINIT, "Provider failed to initialize" },
  68     { WSAEREFUSED, "Operation refused" },
  69     { 0, NULL }
  70 };
  71
  72 static const char *wv_errmap(int errnum)
  73 {
  74
  75     for (WvErrMap *i = wverrmap; i->num; i++)
  76         if (i->num == errnum)
  77             return i->str;
  78     return NULL;
  79 }
  80
  81 #endif
  82
  83 WvErrorBase::~WvErrorBase()
  84 {
  85     // nothing special
  86 }
  87
  88
  89 // win32's strerror() function is incredibly weak, so we'll provide a better
  90 // one.
  91 WvString WvErrorBase::strerror(int errnum)
  92 {
  93     assert(errnum >= 0);
  94
  95 #ifndef _WIN32
  96     return ::strerror(errnum);
  97 #else
  98     const char *wverr = wv_errmap(errnum);
  99     if (wverr)
 100         return wverr;
 101     else if (errnum >= WSABASEERR && errnum < WSABASEERR+2000)
 102     {
 103         // otherwise, an unrecognized winsock error: try getting the error
 104         // message from win32.
 105         char msg[4096];
 106         const HMODULE module = GetModuleHandle("winsock.dll");
 107         DWORD result = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
 108                          module, errnum, 0, msg, sizeof(msg), 0);
 109         if (result)
 110             return msg;
 111
 112         DWORD e = GetLastError();
 113         return WvString("Unknown format %s for error %s", e, errnum);
 114     }
 115     else
 116     {
 117         const char *str = ::strerror(errnum);
 118         if (!strcmp(str, "Unknown error"))
 119             return WvString("Unknown win32 error #%s", errnum);
 120         else
 121             return str;
 122     }
 123 #endif
 124 }
 125
 126
 127 WvString WvErrorBase::errstr() const
 128 {
 129     int errnum = geterr();
 130
 131     if (errnum < 0)
 132     {
 133         assert(!!errstring);
 134         return errstring;
 135     }
 136     else
 137     {
 138         if (!!errstring) return errstring;
 139         return WvErrorBase::strerror(errnum);
 140     }
 141 }
 142
 143
 144 void WvErrorBase::seterr(int _errnum)
 145 {
 146     if (!errnum)
 147     {
 148         assert((_errnum != -1 || !!errstring)
 149             && "attempt to set errnum to -1 without also setting errstring");
 150 #ifdef _WIN32
 151         if (_errnum == WSAECONNABORTED)
 152             _errnum = WSAECONNREFUSED; // work around WINE bug
 153 #endif
 154         errnum = _errnum;
 155     }
 156 }
 157
 158
 159 void WvErrorBase::seterr(WvStringParm specialerr)
 160 {
 161     assert(!!specialerr);
 162     if (!errnum)
 163     {
 164         errstring = specialerr;
 165         seterr(-1);
 166     }
 167 }
 168
 169
 170 void WvErrorBase::seterr(const WvErrorBase &err)
 171 {
 172     if (err.geterr() > 0)
 173         seterr(err.geterr());
 174     else if (err.geterr() < 0)
 175         seterr(err.errstr());
 176 }
 177
 178
 179 void WvErrorBase::seterr_both(int _errnum, WvStringParm specialerr)
 180 {
 181     assert(!!specialerr);
 182     if (!errnum)
 183     {
 184         errstring = specialerr;
 185         seterr(_errnum);
 186     }
 187 }