Mercurial > projects > ldc
annotate lphobos/std/cstream.d @ 1134:152bd2c804d0
Update comments now that LLVM PR3861 has been fixed. However, since
conditionally removing the workaround makes the ABI dependent on LLVM version,
I reconsidered that.
(The same revision of LDC compiling for the same target should probably produce
code that follows the same ABI, right?)
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Tue, 24 Mar 2009 02:46:57 +0100 |
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rev | line source |
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473
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1 /** |
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2 * The std.cstream module bridges std.c.stdio (or std.stdio) and std.stream. |
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3 * Both std.c.stdio and std.stream are publicly imported by std.cstream. |
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4 * Authors: Ben Hinkle |
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5 * License: Public Domain |
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6 * Macros: |
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7 * WIKI=Phobos/StdCstream |
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8 */ |
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9 |
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10 module std.cstream; |
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11 |
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12 import std.stream; |
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13 import std.c.stdio; |
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14 |
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15 /** |
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16 * A Stream wrapper for a C file of type FILE*. |
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17 */ |
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18 class CFile : Stream { |
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19 FILE* cfile; |
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20 |
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21 /** |
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22 * Create the stream wrapper for the given C file. |
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23 * Params: |
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24 * mode = a bitwise combination of $(B FileMode.In) for a readable file |
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25 * and $(B FileMode.Out) for a writeable file. |
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26 * seekable = indicates if the stream should be _seekable. |
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27 */ |
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28 this(FILE* cfile, FileMode mode, bool seekable = false) { |
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29 super(); |
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30 this.file = cfile; |
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31 readable = cast(bool)(mode & FileMode.In); |
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32 writeable = cast(bool)(mode & FileMode.Out); |
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33 this.seekable = seekable; |
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34 } |
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35 |
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36 /** |
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37 * Closes the stream. |
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38 */ |
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39 ~this() { close(); } |
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40 |
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41 /** |
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42 * Property to get or set the underlying file for this stream. |
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43 * Setting the file marks the stream as open. |
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44 */ |
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45 FILE* file() { return cfile; } |
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46 |
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47 /** |
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48 * Ditto |
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49 */ |
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50 void file(FILE* cfile) { |
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51 this.cfile = cfile; |
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52 isopen = true; |
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53 } |
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54 |
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55 /** |
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56 * Overrides of the $(B Stream) methods to call the underlying $(B FILE*) |
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57 * C functions. |
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58 */ |
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59 override void flush() { fflush(cfile); } |
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60 |
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61 /** |
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62 * Ditto |
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63 */ |
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64 override void close() { |
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65 if (isopen) |
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66 fclose(cfile); |
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67 isopen = readable = writeable = seekable = false; |
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68 } |
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69 |
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70 /** |
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71 * Ditto |
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72 */ |
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73 override bool eof() { |
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74 return cast(bool)(readEOF || feof(cfile)); |
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75 } |
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76 |
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77 /** |
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78 * Ditto |
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79 */ |
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80 override char getc() { |
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81 return cast(char)fgetc(cfile); |
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82 } |
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83 |
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84 /** |
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85 * Ditto |
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86 */ |
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87 override char ungetc(char c) { |
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88 return cast(char)std.c.stdio.ungetc(c,cfile); |
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89 } |
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90 |
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91 /** |
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92 * Ditto |
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93 */ |
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94 override size_t readBlock(void* buffer, size_t size) { |
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95 size_t n = fread(buffer,1,size,cfile); |
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96 readEOF = cast(bool)(n == 0); |
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97 return n; |
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98 } |
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99 |
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100 /** |
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101 * Ditto |
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102 */ |
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103 override size_t writeBlock(void* buffer, size_t size) { |
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104 return fwrite(buffer,1,size,cfile); |
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105 } |
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106 |
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107 /** |
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108 * Ditto |
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109 */ |
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110 override ulong seek(long offset, SeekPos rel) { |
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111 readEOF = false; |
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112 if (fseek(cfile,cast(int)offset,rel) != 0) |
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113 throw new SeekException("unable to move file pointer"); |
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114 return ftell(cfile); |
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115 } |
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116 |
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117 /** |
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118 * Ditto |
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119 */ |
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120 override void writeLine(char[] s) { |
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121 writeString(s); |
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122 writeString("\n"); |
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123 } |
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124 |
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125 /** |
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126 * Ditto |
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127 */ |
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128 override void writeLineW(wchar[] s) { |
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129 writeStringW(s); |
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130 writeStringW("\n"); |
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131 } |
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132 |
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133 // run a few tests |
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134 unittest { |
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135 FILE* f = fopen("stream.txt","w"); |
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136 assert(f !is null); |
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137 CFile file = new CFile(f,FileMode.Out); |
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138 int i = 666; |
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139 // should be ok to write |
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140 assert(file.writeable); |
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141 file.writeLine("Testing stream.d:"); |
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142 file.writeString("Hello, world!"); |
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143 file.write(i); |
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144 // string#1 + string#2 + int should give exacly that |
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145 version (Win32) |
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146 assert(file.position() == 19 + 13 + 4); |
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147 version (linux) |
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148 assert(file.position() == 18 + 13 + 4); |
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149 file.close(); |
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150 // no operations are allowed when file is closed |
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151 assert(!file.readable && !file.writeable && !file.seekable); |
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152 f = fopen("stream.txt","r"); |
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153 file = new CFile(f,FileMode.In,true); |
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154 // should be ok to read |
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155 assert(file.readable); |
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156 char[] line = file.readLine(); |
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157 char[] exp = "Testing stream.d:"; |
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158 assert(line[0] == 'T'); |
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159 assert(line.length == exp.length); |
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160 assert(!std.string.cmp(line, "Testing stream.d:")); |
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161 // jump over "Hello, " |
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162 file.seek(7, SeekPos.Current); |
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163 version (Win32) |
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164 assert(file.position() == 19 + 7); |
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165 version (linux) |
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166 assert(file.position() == 18 + 7); |
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167 assert(!std.string.cmp(file.readString(6), "world!")); |
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168 i = 0; file.read(i); |
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169 assert(i == 666); |
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170 // string#1 + string#2 + int should give exacly that |
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171 version (Win32) |
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172 assert(file.position() == 19 + 13 + 4); |
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173 version (linux) |
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174 assert(file.position() == 18 + 13 + 4); |
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175 // we must be at the end of file |
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176 file.close(); |
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177 f = fopen("stream.txt","w+"); |
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178 file = new CFile(f,FileMode.In|FileMode.Out,true); |
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179 file.writeLine("Testing stream.d:"); |
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180 file.writeLine("Another line"); |
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181 file.writeLine(""); |
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182 file.writeLine("That was blank"); |
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183 file.position = 0; |
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184 char[][] lines; |
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185 foreach(char[] line; file) { |
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186 lines ~= line.dup; |
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187 } |
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188 assert( lines.length == 5 ); |
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189 assert( lines[0] == "Testing stream.d:"); |
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190 assert( lines[1] == "Another line"); |
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191 assert( lines[2] == ""); |
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192 assert( lines[3] == "That was blank"); |
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193 file.position = 0; |
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194 lines = new char[][5]; |
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195 foreach(ulong n, char[] line; file) { |
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196 lines[cast(size_t)(n-1)] = line.dup; |
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197 } |
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198 assert( lines[0] == "Testing stream.d:"); |
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199 assert( lines[1] == "Another line"); |
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200 assert( lines[2] == ""); |
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201 assert( lines[3] == "That was blank"); |
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202 file.close(); |
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203 remove("stream.txt"); |
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204 } |
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205 } |
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206 |
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207 /** |
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208 * CFile wrapper of std.c.stdio.stdin (not seekable). |
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209 */ |
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210 CFile din; |
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211 |
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212 /** |
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213 * CFile wrapper of std.c.stdio.stdout (not seekable). |
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214 */ |
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215 CFile dout; |
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216 |
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217 /** |
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218 * CFile wrapper of std.c.stdio.stderr (not seekable). |
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219 */ |
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220 CFile derr; |
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221 |
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222 static this() { |
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223 // open standard I/O devices |
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224 din = new CFile(std.c.stdio.stdin,FileMode.In); |
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225 dout = new CFile(std.c.stdio.stdout,FileMode.Out); |
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226 derr = new CFile(std.c.stdio.stderr,FileMode.Out); |
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227 } |
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228 |