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annotate lphobos/std/cstream.d @ 883:b52d5de7783f

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GC defines and linkage changes.
author Christian Kamm <kamm incasoftware de>
date Thu, 08 Jan 2009 18:20:02 +0100
parents 373489eeaf90
children
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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