Tue, 23 Aug 2016 15:07:29 +0200
cleans up formatfile function up to the parser call
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2015 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | /** |
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30 | * @file buffer.h |
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31 | * |
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32 | * Advanced buffer implementation. |
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33 | * |
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34 | * Instances of UcxBuffer can be used to read from or to write to like one |
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35 | * would do with a stream. This allows the use of ucx_stream_copy() to copy |
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36 | * contents from one buffer to another. |
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37 | * |
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38 | * Some features for convenient use of the buffer |
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39 | * can be enabled. See the documentation of the macro constants for more |
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40 | * information. |
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41 | * |
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42 | * @author Mike Becker |
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43 | * @author Olaf Wintermann |
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44 | */ |
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45 | |
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46 | #ifndef UCX_BUFFER_H |
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47 | #define UCX_BUFFER_H |
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48 | |
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49 | #include "ucx.h" |
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50 | #include <sys/types.h> |
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51 | #include <stdio.h> |
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52 | |
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53 | #ifdef __cplusplus |
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54 | extern "C" { |
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55 | #endif |
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56 | |
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57 | /** |
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58 | * No buffer features enabled (all flags cleared). |
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59 | */ |
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60 | #define UCX_BUFFER_DEFAULT 0x00 |
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61 | |
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62 | /** |
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63 | * If this flag is enabled, the buffer will automatically free its contents. |
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64 | */ |
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65 | #define UCX_BUFFER_AUTOFREE 0x01 |
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66 | |
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67 | /** |
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68 | * If this flag is enabled, the buffer will automatically extends its capacity. |
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69 | */ |
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70 | #define UCX_BUFFER_AUTOEXTEND 0x02 |
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71 | |
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72 | /** UCX Buffer. */ |
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73 | typedef struct { |
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74 | /** A pointer to the buffer contents. */ |
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75 | char *space; |
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76 | /** Current position of the buffer. */ |
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77 | size_t pos; |
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78 | /** Current capacity (i.e. maximum size) of the buffer. */ |
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79 | size_t capacity; |
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80 | /** Current size of the buffer content. */ |
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81 | size_t size; |
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82 | /** |
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83 | * Flag register for buffer features. |
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84 | * @see #UCX_BUFFER_DEFAULT |
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85 | * @see #UCX_BUFFER_AUTOFREE |
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86 | * @see #UCX_BUFFER_AUTOEXTEND |
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87 | */ |
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88 | int flags; |
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89 | } UcxBuffer; |
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90 | |
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91 | /** |
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92 | * Creates a new buffer. |
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93 | * |
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94 | * <b>Note:</b> you may provide <code>NULL</code> as argument for |
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95 | * <code>space</code>. Then this function will allocate the space and enforce |
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96 | * the #UCX_BUFFER_AUTOFREE flag. |
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97 | * |
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98 | * @param space pointer to the memory area, or <code>NULL</code> to allocate |
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99 | * new memory |
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100 | * @param capacity the capacity of the buffer |
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101 | * @param flags buffer features (see UcxBuffer.flags) |
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102 | * @return the new buffer |
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103 | */ |
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104 | UcxBuffer *ucx_buffer_new(void *space, size_t capacity, int flags); |
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105 | |
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106 | /** |
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107 | * Destroys a buffer. |
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108 | * |
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109 | * If the #UCX_BUFFER_AUTOFREE feature is enabled, the contents of the buffer |
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110 | * are also freed. |
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111 | * |
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112 | * @param buffer the buffer to destroy |
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113 | */ |
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114 | void ucx_buffer_free(UcxBuffer* buffer); |
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115 | |
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116 | /** |
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117 | * Creates a new buffer and fills it with extracted content from another buffer. |
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118 | * |
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119 | * <b>Note:</b> the #UCX_BUFFER_AUTOFREE feature is enforced for the new buffer. |
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120 | * |
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121 | * @param src the source buffer |
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122 | * @param start the start position of extraction |
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123 | * @param length the count of bytes to extract (must not be zero) |
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124 | * @param flags feature mask for the new buffer |
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125 | * @return a new buffer containing the extraction |
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126 | */ |
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127 | UcxBuffer* ucx_buffer_extract(UcxBuffer *src, |
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128 | size_t start, size_t length, int flags); |
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129 | |
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130 | /** |
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131 | * A shorthand macro for the full extraction of the buffer. |
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132 | * |
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133 | * @param src the source buffer |
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134 | * @param flags feature mask for the new buffer |
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135 | * @return a new buffer with the extracted content |
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136 | */ |
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137 | #define ucx_buffer_clone(src,flags) \ |
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138 | ucx_buffer_extract(src, 0, (src)->capacity, flags) |
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139 | |
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140 | /** |
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141 | * Moves the position of the buffer. |
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142 | * |
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143 | * The new position is relative to the <code>whence</code> argument. |
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144 | * |
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145 | * SEEK_SET marks the start of the buffer. |
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146 | * SEEK_CUR marks the current position. |
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147 | * SEEK_END marks the end of the buffer. |
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148 | * |
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149 | * With an offset of zero, this function sets the buffer position to zero |
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150 | * (SEEK_SET), the buffer size (SEEK_END) or leaves the buffer position |
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151 | * unchanged (SEEK_CUR). |
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152 | * |
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153 | * @param buffer |
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154 | * @param offset position offset relative to <code>whence</code> |
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155 | * @param whence one of SEEK_SET, SEEK_CUR or SEEK_END |
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156 | * @return 0 on success, non-zero if the position is invalid |
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157 | * |
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158 | */ |
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159 | int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence); |
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160 | |
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161 | /** |
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162 | * Clears the buffer by resetting the position and deleting the data. |
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163 | * |
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164 | * The data is deleted by a zeroing it with call to <code>memset()</code>. |
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165 | * |
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166 | * @param buffer the buffer to be cleared |
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167 | */ |
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168 | #define ucx_buffer_clear(buffer) memset(buffer->space, 0, buffer->size); \ |
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169 | buffer->size = 0; buffer->pos = 0; |
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170 | |
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171 | /** |
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172 | * Tests, if the buffer position has exceeded the buffer capacity. |
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173 | * |
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174 | * @param buffer the buffer to test |
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175 | * @return non-zero, if the current buffer position has exceeded the last |
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176 | * available byte of the buffer. |
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177 | */ |
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178 | int ucx_buffer_eof(UcxBuffer *buffer); |
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179 | |
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180 | |
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181 | /** |
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182 | * Extends the capacity of the buffer. |
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183 | * |
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184 | * <b>Note:</b> The buffer capacity increased by a power of two. I.e. |
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185 | * the buffer capacity is doubled, as long as it would not hold the current |
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186 | * content plus the additional required bytes. |
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187 | * |
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188 | * <b>Attention:</b> the argument provided is the number of <i>additional</i> |
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189 | * bytes the buffer shall hold. It is <b>NOT</b> the total number of bytes the |
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190 | * buffer shall hold. |
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191 | * |
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192 | * @param buffer the buffer to extend |
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193 | * @param additional_bytes the number of additional bytes the buffer shall |
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194 | * <i>at least</i> hold |
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195 | * @return 0 on success or a non-zero value on failure |
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196 | */ |
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197 | int ucx_buffer_extend(UcxBuffer *buffer, size_t additional_bytes); |
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198 | |
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199 | /** |
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200 | * Writes data to an UcxBuffer. |
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201 | * |
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202 | * The position of the buffer is increased by the number of bytes written. |
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203 | * |
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204 | * @param ptr a pointer to the memory area containing the bytes to be written |
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205 | * @param size the length of one element |
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206 | * @param nitems the element count |
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207 | * @param buffer the UcxBuffer to write to |
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208 | * @return the total count of bytes written |
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209 | */ |
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210 | size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems, |
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211 | UcxBuffer *buffer); |
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212 | |
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213 | /** |
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214 | * Reads data from an UcxBuffer. |
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215 | * |
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216 | * The position of the buffer is increased by the number of bytes read. |
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217 | * |
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218 | * @param ptr a pointer to the memory area where to store the read data |
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219 | * @param size the length of one element |
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220 | * @param nitems the element count |
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221 | * @param buffer the UcxBuffer to read from |
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222 | * @return the total number of elements read |
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223 | */ |
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224 | size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems, |
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225 | UcxBuffer *buffer); |
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226 | |
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227 | /** |
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228 | * Writes a character to a buffer. |
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229 | * |
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230 | * The least significant byte of the argument is written to the buffer. If the |
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231 | * end of the buffer is reached and #UCX_BUFFER_AUTOEXTEND feature is enabled, |
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232 | * the buffer capacity is extended by ucx_buffer_extend(). If the feature is |
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233 | * disabled or buffer extension fails, <code>EOF</code> is returned. |
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234 | * |
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235 | * On successful write the position of the buffer is increased. |
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236 | * |
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237 | * @param buffer the buffer to write to |
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238 | * @param c the character to write as <code>int</code> value |
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239 | * @return the byte that has bean written as <code>int</code> value or |
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240 | * <code>EOF</code> when the end of the stream is reached and automatic |
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241 | * extension is not enabled or not possible |
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242 | */ |
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243 | int ucx_buffer_putc(UcxBuffer *buffer, int c); |
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244 | |
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245 | /** |
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246 | * Gets a character from a buffer. |
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247 | * |
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248 | * The current position of the buffer is increased after a successful read. |
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249 | * |
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250 | * @param buffer the buffer to read from |
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251 | * @return the character as <code>int</code> value or <code>EOF</code>, if the |
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252 | * end of the buffer is reached |
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253 | */ |
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254 | int ucx_buffer_getc(UcxBuffer *buffer); |
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255 | |
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256 | /** |
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257 | * Writes a string to a buffer. |
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258 | * |
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259 | * @param buffer the buffer |
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260 | * @param str the string |
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261 | * @return the number of bytes written |
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262 | */ |
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263 | size_t ucx_buffer_puts(UcxBuffer *buffer, char *str); |
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264 | |
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265 | #ifdef __cplusplus |
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266 | } |
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267 | #endif |
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268 | |
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269 | #endif /* UCX_BUFFER_H */ |
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270 |