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annotate lphobos/std/outbuffer.d @ 650:aa6a0b7968f7

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Added test case for bug #100 Removed dubious check for not emitting static private global in other modules without access. This should be handled properly somewhere else, it's causing unresolved global errors for stuff that should work (in MiniD)
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Sun, 05 Oct 2008 17:28:15 +0200
parents 373489eeaf90
children 88e23f8c2354
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1 // outbuffer.d
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2
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3 /**
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4 * Boilerplate:
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5 * $(std_boilerplate.html)
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6 * Macros:
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7 * WIKI = Phobos/StdOutbuffer
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8 * Copyright:
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9 * Copyright (c) 2001-2005 by Digital Mars
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10 * All Rights Reserved
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11 * www.digitalmars.com
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12 */
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13
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14
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15 // Written by Walter Bright
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16
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17 /* NOTE: This file has been patched from the original DMD distribution to
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18 work with the GDC compiler.
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19
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20 Modified by David Friedman, September 2004
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21 */
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22
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23 module std.outbuffer;
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24
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25 private
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26 {
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27 import std.string;
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28 import std.gc;
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29 import std.c.stdio;
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30 import std.c.stdlib;
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31 import std.c.stdarg;
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32 }
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33
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34 /*********************************************
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35 * OutBuffer provides a way to build up an array of bytes out
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36 * of raw data. It is useful for things like preparing an
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37 * array of bytes to write out to a file.
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38 * OutBuffer's byte order is the format native to the computer.
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39 * To control the byte order (endianness), use a class derived
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40 * from OutBuffer.
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41 */
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42
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43 class OutBuffer
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44 {
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45 ubyte data[];
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46 size_t offset;
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47
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48 invariant
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49 {
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50 //printf("this = %p, offset = %x, data.length = %u\n", this, offset, data.length);
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51 assert(offset <= data.length);
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52 assert(data.length <= std.gc.capacity(data.ptr));
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53 }
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54
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55 this()
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56 {
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57 //printf("in OutBuffer constructor\n");
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58 }
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59
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60 /*********************************
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61 * Convert to array of bytes.
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62 */
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63
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64 ubyte[] toBytes() { return data[0 .. offset]; }
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65
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66 /***********************************
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67 * Preallocate nbytes more to the size of the internal buffer.
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68 *
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69 * This is a
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70 * speed optimization, a good guess at the maximum size of the resulting
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71 * buffer will improve performance by eliminating reallocations and copying.
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72 */
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73
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74
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75 void reserve(size_t nbytes)
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76 in
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77 {
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78 assert(offset + nbytes >= offset);
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79 }
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80 out
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81 {
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82 assert(offset + nbytes <= data.length);
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83 assert(data.length <= std.gc.capacity(data.ptr));
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84 }
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85 body
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86 {
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87 if (data.length < offset + nbytes)
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88 {
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89 //std.c.stdio.printf("OutBuffer.reserve: ptr = %p, length = %d, offset = %d, nbytes = %d, capacity = %d\n", data.ptr, data.length, offset, nbytes, std.gc.capacity(data.ptr));
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90 data.length = (offset + nbytes) * 2;
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91 //std.c.stdio.printf("OutBuffer.reserve: ptr = %p, length = %d, capacity = %d\n", data.ptr, data.length, std.gc.capacity(data.ptr));
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92 std.gc.hasPointers(data.ptr);
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93 }
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94 }
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95
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96 /*************************************
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97 * Append data to the internal buffer.
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98 */
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99
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100 void write(ubyte[] bytes)
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101 {
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102 reserve(bytes.length);
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103 data[offset .. offset + bytes.length] = bytes;
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104 offset += bytes.length;
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105 }
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106
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107 void write(ubyte b) /// ditto
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108 {
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109 reserve(ubyte.sizeof);
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110 this.data[offset] = b;
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111 offset += ubyte.sizeof;
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112 }
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113
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114 void write(byte b) { write(cast(ubyte)b); } /// ditto
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115 void write(char c) { write(cast(ubyte)c); } /// ditto
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116
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117 void write(ushort w) /// ditto
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118 {
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119 reserve(ushort.sizeof);
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120 *cast(ushort *)&data[offset] = w;
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121 offset += ushort.sizeof;
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122 }
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123
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124 void write(short s) { write(cast(ushort)s); } /// ditto
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125
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126 void write(wchar c) /// ditto
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127 {
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128 reserve(wchar.sizeof);
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129 *cast(wchar *)&data[offset] = c;
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130 offset += wchar.sizeof;
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131 }
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132
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133 void write(uint w) /// ditto
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134 {
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135 reserve(uint.sizeof);
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136 *cast(uint *)&data[offset] = w;
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137 offset += uint.sizeof;
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138 }
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139
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140 void write(int i) { write(cast(uint)i); } /// ditto
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141
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142 void write(ulong l) /// ditto
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143 {
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144 reserve(ulong.sizeof);
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145 *cast(ulong *)&data[offset] = l;
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146 offset += ulong.sizeof;
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147 }
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148
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149 void write(long l) { write(cast(ulong)l); } /// ditto
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150
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151 void write(float f) /// ditto
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152 {
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153 reserve(float.sizeof);
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154 *cast(float *)&data[offset] = f;
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155 offset += float.sizeof;
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156 }
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157
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158 void write(double f) /// ditto
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159 {
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160 reserve(double.sizeof);
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161 *cast(double *)&data[offset] = f;
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162 offset += double.sizeof;
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163 }
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164
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165 void write(real f) /// ditto
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166 {
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167 reserve(real.sizeof);
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168 *cast(real *)&data[offset] = f;
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169 offset += real.sizeof;
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170 }
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171
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172 void write(char[] s) /// ditto
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173 {
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174 write(cast(ubyte[])s);
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175 }
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176
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177 void write(OutBuffer buf) /// ditto
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178 {
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179 write(buf.toBytes());
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180 }
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181
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182 /****************************************
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183 * Append nbytes of 0 to the internal buffer.
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184 */
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185
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186 void fill0(uint nbytes)
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187 {
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188 reserve(nbytes);
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189 data[offset .. offset + nbytes] = 0;
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190 offset += nbytes;
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191 }
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192
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193 /**********************************
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194 * 0-fill to align on power of 2 boundary.
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195 */
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196
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197 void alignSize(size_t alignsize)
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198 in
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199 {
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200 assert(alignsize && (alignsize & (alignsize - 1)) == 0);
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201 }
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202 out
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203 {
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204 assert((offset & (alignsize - 1)) == 0);
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205 }
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diff changeset
206 body
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207 { size_t nbytes;
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208
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209 nbytes = offset & (alignsize - 1);
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diff changeset
210 if (nbytes)
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211 fill0(alignsize - nbytes);
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parents:
diff changeset
212 }
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diff changeset
213
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214 /****************************************
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215 * Optimize common special case alignSize(2)
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diff changeset
216 */
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217
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diff changeset
218 void align2()
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diff changeset
219 {
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diff changeset
220 if (offset & 1)
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diff changeset
221 write(cast(byte)0);
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parents:
diff changeset
222 }
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diff changeset
223
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diff changeset
224 /****************************************
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diff changeset
225 * Optimize common special case alignSize(4)
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diff changeset
226 */
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diff changeset
227
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diff changeset
228 void align4()
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diff changeset
229 {
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diff changeset
230 if (offset & 3)
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diff changeset
231 { size_t nbytes = (4 - offset) & 3;
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diff changeset
232 fill0(nbytes);
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diff changeset
233 }
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parents:
diff changeset
234 }
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diff changeset
235
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diff changeset
236 /**************************************
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diff changeset
237 * Convert internal buffer to array of chars.
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diff changeset
238 */
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diff changeset
239
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diff changeset
240 char[] toString()
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parents:
diff changeset
241 {
373489eeaf90 Applied downs' lphobos update
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diff changeset
242 //printf("OutBuffer.toString()\n");
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diff changeset
243 return cast(char[])data[0 .. offset];
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parents:
diff changeset
244 }
373489eeaf90 Applied downs' lphobos update
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diff changeset
245
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diff changeset
246 /*****************************************
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diff changeset
247 * Append output of C's vprintf() to internal buffer.
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diff changeset
248 */
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diff changeset
249
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diff changeset
250 void vprintf(char[] format, va_list args)
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diff changeset
251 {
373489eeaf90 Applied downs' lphobos update
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diff changeset
252 char[128] buffer;
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diff changeset
253 char* p;
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diff changeset
254 char* f;
373489eeaf90 Applied downs' lphobos update
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diff changeset
255 uint psize;
373489eeaf90 Applied downs' lphobos update
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diff changeset
256 int count;
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diff changeset
257 va_list args_copy;
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diff changeset
258
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diff changeset
259 f = toStringz(format);
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diff changeset
260 p = buffer.ptr;
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diff changeset
261 psize = buffer.length;
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parents:
diff changeset
262 for (;;)
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parents:
diff changeset
263 {
373489eeaf90 Applied downs' lphobos update
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diff changeset
264 va_copy(args_copy, args);
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
265 version(Win32)
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parents:
diff changeset
266 {
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diff changeset
267 count = _vsnprintf(p,psize,f,args_copy);
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parents:
diff changeset
268 if (count != -1)
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diff changeset
269 break;
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diff changeset
270 psize *= 2;
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diff changeset
271 p = cast(char *) alloca(psize); // buffer too small, try again with larger size
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parents:
diff changeset
272 }
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diff changeset
273 else version(GNU) {
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diff changeset
274 count = vsnprintf(p,psize,f,args_copy);
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parents:
diff changeset
275 if (count == -1)
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diff changeset
276 psize *= 2;
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diff changeset
277 else if (count >= psize)
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diff changeset
278 psize = count + 1;
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parents:
diff changeset
279 else
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parents:
diff changeset
280 break;
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diff changeset
281 p = cast(char *) alloca(psize); // buffer too small, try again with larger size
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parents:
diff changeset
282 }
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parents:
diff changeset
283 else version(linux)
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parents:
diff changeset
284 {
373489eeaf90 Applied downs' lphobos update
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diff changeset
285 count = vsnprintf(p,psize,f,args_copy);
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parents:
diff changeset
286 if (count == -1)
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diff changeset
287 psize *= 2;
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parents:
diff changeset
288 else if (count >= psize)
373489eeaf90 Applied downs' lphobos update
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diff changeset
289 psize = count + 1;
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parents:
diff changeset
290 else
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
291 break;
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
292 /+
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
293 if (p != buffer)
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
294 c.stdlib.free(p);
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
295 p = (char *) c.stdlib.malloc(psize); // buffer too small, try again with larger size
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296 +/
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297 p = cast(char *) alloca(psize); // buffer too small, try again with larger size
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298 }
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299 }
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300 write(p[0 .. count]);
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301 /+
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302 version (linux)
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303 {
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304 if (p != buffer)
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305 c.stdlib.free(p);
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306 }
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307 +/
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308 }
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309
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310 /*****************************************
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311 * Append output of C's printf() to internal buffer.
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312 */
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313
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314 void printf(char[] format, ...)
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315 {
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316 version (GNU)
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317 {
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318 vprintf(format, _argptr);
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319 }
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320 else
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321 {
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322 va_list ap;
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323 ap = cast(va_list)&format;
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324 ap += format.sizeof;
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325 vprintf(format, ap);
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326 }
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327 }
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328
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329 /*****************************************
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330 * At offset index into buffer, create nbytes of space by shifting upwards
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331 * all data past index.
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332 */
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333
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334 void spread(size_t index, size_t nbytes)
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335 in
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336 {
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337 assert(index <= offset);
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338 }
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339 body
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340 {
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341 reserve(nbytes);
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342
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343 // This is an overlapping copy - should use memmove()
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344 for (size_t i = offset; i > index; )
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345 {
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346 --i;
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347 data[i + nbytes] = data[i];
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348 }
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349 offset += nbytes;
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350 }
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351 }
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352
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353 unittest
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354 {
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355 //printf("Starting OutBuffer test\n");
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356
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357 OutBuffer buf = new OutBuffer();
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358
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359 //printf("buf = %p\n", buf);
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360 //printf("buf.offset = %x\n", buf.offset);
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361 assert(buf.offset == 0);
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362 buf.write("hello");
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363 buf.write(cast(byte)0x20);
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364 buf.write("world");
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365 buf.printf(" %d", 6);
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366 //printf("buf = '%.*s'\n", buf.toString());
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367 assert(cmp(buf.toString(), "hello world 6") == 0);
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368 }