programs/hostname/hostname.c

   1 /*
   2  * Hostname display utility
   3  *
   4  * Copyright 2008 Andrew Riedi
   5  * Copyright 2010-2011 Andrew Nguyen
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <stdarg.h>
  23 #include <windef.h>
  24 #include <winbase.h>
  25 #include <wincon.h>
  26 #include <winnls.h>
  27 #include <winuser.h>
  28
  29 #include <wine/unicode.h>
  30
  31 #include "hostname.h"
  32
  33 static int hostname_vprintfW(const WCHAR *msg, va_list va_args)
  34 {
  35     int wlen;
  36     DWORD count, ret;
  37     WCHAR msg_buffer[8192];
  38
  39     wlen = vsprintfW(msg_buffer, msg, va_args);
  40
  41     ret = WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE), msg_buffer, wlen, &count, NULL);
  42     if (!ret)
  43     {
  44         DWORD len;
  45         char *msgA;
  46
  47         /* On Windows WriteConsoleW() fails if the output is redirected. So fall
  48          * back to WriteFile(), assuming the console encoding is still the right
  49          * one in that case.
  50          */
  51         len = WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen,
  52             NULL, 0, NULL, NULL);
  53         msgA = HeapAlloc(GetProcessHeap(), 0, len);
  54         if (!msgA)
  55             return 0;
  56
  57         WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen, msgA, len,
  58             NULL, NULL);
  59         WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), msgA, len, &count, FALSE);
  60         HeapFree(GetProcessHeap(), 0, msgA);
  61     }
  62
  63     return count;
  64 }
  65
  66 static int hostname_printfW(const WCHAR *msg, ...)
  67 {
  68     va_list va_args;
  69     int len;
  70
  71     va_start(va_args, msg);
  72     len = hostname_vprintfW(msg, va_args);
  73     va_end(va_args);
  74
  75     return len;
  76 }
  77
  78 static int hostname_message_printfW(int msg, ...)
  79 {
  80     va_list va_args;
  81     WCHAR msg_buffer[8192];
  82     int len;
  83
  84     LoadStringW(GetModuleHandleW(NULL), msg, msg_buffer, ARRAY_SIZE(msg_buffer));
  85
  86     va_start(va_args, msg);
  87     len = hostname_vprintfW(msg_buffer, va_args);
  88     va_end(va_args);
  89
  90     return len;
  91 }
  92
  93 static int hostname_message(int msg)
  94 {
  95     static const WCHAR formatW[] = {'%','s',0};
  96     WCHAR msg_buffer[8192];
  97
  98     LoadStringW(GetModuleHandleW(NULL), msg, msg_buffer, ARRAY_SIZE(msg_buffer));
  99
 100     return hostname_printfW(formatW, msg_buffer);
 101 }
 102
 103 static int display_computer_name(void)
 104 {
 105     static const WCHAR fmtW[] = {'%','s','\r','\n',0};
 106
 107     WCHAR name[MAX_COMPUTERNAME_LENGTH + 1];
 108     DWORD size = ARRAY_SIZE(name);
 109     BOOL ret;
 110
 111     ret = GetComputerNameW(name, &size);
 112     if (!ret)
 113     {
 114         hostname_message_printfW(STRING_CANNOT_GET_HOSTNAME, GetLastError());
 115         return 1;
 116     }
 117
 118     hostname_printfW(fmtW, name);
 119     return 0;
 120 }
 121
 122 int wmain(int argc, WCHAR *argv[])
 123 {
 124     if (argc > 1)
 125     {
 126         static const WCHAR slashHelpW[] = {'/','?',0};
 127
 128         unsigned int i;
 129
 130         if (!strncmpW(argv[1], slashHelpW, ARRAY_SIZE(slashHelpW) - 1))
 131         {
 132             hostname_message(STRING_USAGE);
 133             return 1;
 134         }
 135
 136         for (i = 1; i < argc; i++)
 137         {
 138             if (argv[i][0] == '-')
 139             {
 140                 switch (argv[i][1])
 141                 {
 142                     case 's':
 143                         /* Ignore the option and continue processing. */
 144                         break;
 145                     case '?':
 146                         hostname_message(STRING_USAGE);
 147                         return 1;
 148                     default:
 149                         hostname_message_printfW(STRING_INVALID_OPTION, argv[i][1]);
 150                         hostname_message(STRING_USAGE);
 151                         return 1;
 152                 }
 153             }
 154             else
 155             {
 156                 hostname_message(STRING_CANNOT_SET_HOSTNAME);
 157                 hostname_message(STRING_USAGE);
 158                 return 1;
 159             }
 160         }
 161     }
 162
 163     return display_computer_name();
 164 }