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1 /*******************************************************************************
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2
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3 copyright: Copyright (c) 2004 Kris Bell. All rights reserved
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4
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5 license: BSD style: $(LICENSE)
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6
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7 version: Initial release: November 2005
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8
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9 author: Kris
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10
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11 *******************************************************************************/
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12
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13 module tango.sys.Common;
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14
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15 version (Win32)
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16 {
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17 public import tango.sys.win32.UserGdi;
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18 }
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19
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20 version (linux)
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21 {
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22 public import tango.sys.linux.linux;
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23 alias tango.sys.linux.linux posix;
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24 }
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25
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26 version (darwin)
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27 {
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28 public import tango.sys.darwin.darwin;
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29 alias tango.sys.darwin.darwin posix;
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30 }
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31
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32
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33 /*******************************************************************************
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34
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35 Stuff for sysErrorMsg(), kindly provided by Regan Heath.
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36
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37 *******************************************************************************/
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38
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39 version (Win32)
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40 {
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41 private const FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100;
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42 private const FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200;
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43 private const FORMAT_MESSAGE_FROM_STRING = 0x00000400;
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44 private const FORMAT_MESSAGE_FROM_HMODULE = 0x00000800;
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45 private const FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000;
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46 private const FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x00002000;
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47 private const FORMAT_MESSAGE_MAX_WIDTH_MASK = 0x000000FF;
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48
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49 private DWORD MAKELANGID(WORD p, WORD s) { return (((cast(WORD)s) << 10) | cast(WORD)p); }
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50
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51 private alias HGLOBAL HLOCAL;
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52
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53 private const LANG_NEUTRAL = 0x00;
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54 private const SUBLANG_DEFAULT = 0x01;
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55
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56 private extern (Windows)
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57 {
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58 DWORD FormatMessageA (DWORD dwFlags,
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59 LPCVOID lpSource,
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60 DWORD dwMessageId,
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61 DWORD dwLanguageId,
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62 LPTSTR lpBuffer,
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63 DWORD nSize,
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64 LPCVOID args
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65 );
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66
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67 HLOCAL LocalFree(HLOCAL hMem);
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68 }
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69 }
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70 else
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71 version (Posix)
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72 {
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73 private import tango.stdc.errno;
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74 private import tango.stdc.string;
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75 }
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76 else
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77 {
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78 pragma (msg, "Unsupported environment; neither Win32 or Posix is declared");
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79 static assert(0);
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80 }
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81
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82
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83 /*******************************************************************************
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84
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85 *******************************************************************************/
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86
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87 struct SysError
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88 {
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89 /***********************************************************************
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90
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91 ***********************************************************************/
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92
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93 static uint lastCode ()
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94 {
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95 version (Win32)
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96 return GetLastError;
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97 else
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98 return errno;
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99 }
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100
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101 /***********************************************************************
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102
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103 ***********************************************************************/
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104
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105 static char[] lastMsg ()
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106 {
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107 return lookup (lastCode);
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108 }
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109
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110 /***********************************************************************
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111
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112 ***********************************************************************/
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113
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114 static char[] lookup (uint errcode)
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115 {
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116 char[] text;
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117
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118 version (Win32)
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119 {
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120 DWORD r;
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121 LPVOID lpMsgBuf;
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122
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123 r = FormatMessageA (
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124 FORMAT_MESSAGE_ALLOCATE_BUFFER |
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125 FORMAT_MESSAGE_FROM_SYSTEM |
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126 FORMAT_MESSAGE_IGNORE_INSERTS,
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127 null,
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128 errcode,
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129 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
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130 cast(LPTSTR)&lpMsgBuf,
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131 0,
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132 null);
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133
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134 /* Remove \r\n from error string */
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135 if (r >= 2) r-= 2;
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136 text = (cast(char *)lpMsgBuf)[0..r].dup;
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137 LocalFree(cast(HLOCAL)lpMsgBuf);
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138 }
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139 else
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140 {
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141 uint r;
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142 char* pemsg;
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143
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144 pemsg = strerror(errcode);
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145 r = strlen(pemsg);
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146
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147 /* Remove \r\n from error string */
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148 if (pemsg[r-1] == '\n') r--;
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149 if (pemsg[r-1] == '\r') r--;
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150 text = pemsg[0..r].dup;
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151 }
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152
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153 return text;
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154 }
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155 }
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