Sun, 17 Dec 2023 15:33:50 +0100
fix faulty string to int conversion utilities
Probably it was expected that errno is set to EINVAL when illegal characters are encountered. But this is not standard and does not happen on every system, allowing illegal strings to be parsed as valid integers.
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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 2021 Mike Becker, 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 | #include "cx/buffer.h" |
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30 | #include "cx/utils.h" |
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31 | |
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32 | #include <stdio.h> |
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33 | #include <string.h> |
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34 | |
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35 | int cxBufferInit( |
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36 | CxBuffer *buffer, |
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37 | void *space, |
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38 | size_t capacity, |
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39 | CxAllocator const *allocator, |
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40 | int flags |
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41 | ) { |
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42 | if (allocator == NULL) allocator = cxDefaultAllocator; |
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43 | buffer->allocator = allocator; |
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44 | buffer->flags = flags; |
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45 | if (!space) { |
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46 | buffer->bytes = cxMalloc(allocator, capacity); |
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47 | if (buffer->bytes == NULL) { |
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48 | return 1; |
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49 | } |
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50 | buffer->flags |= CX_BUFFER_FREE_CONTENTS; |
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51 | } else { |
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52 | buffer->bytes = space; |
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53 | } |
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54 | buffer->capacity = capacity; |
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55 | buffer->size = 0; |
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56 | buffer->pos = 0; |
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57 | |
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58 | buffer->flush_func = NULL; |
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59 | buffer->flush_target = NULL; |
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60 | buffer->flush_blkmax = 0; |
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61 | buffer->flush_blksize = 4096; |
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62 | buffer->flush_threshold = SIZE_MAX; |
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63 | |
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64 | return 0; |
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65 | } |
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66 | |
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67 | void cxBufferDestroy(CxBuffer *buffer) { |
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68 | if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) { |
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69 | cxFree(buffer->allocator, buffer->bytes); |
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70 | } |
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71 | } |
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72 | |
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73 | CxBuffer *cxBufferCreate( |
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74 | void *space, |
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75 | size_t capacity, |
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76 | CxAllocator const *allocator, |
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77 | int flags |
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78 | ) { |
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79 | CxBuffer *buf = cxMalloc(allocator, sizeof(CxBuffer)); |
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80 | if (buf == NULL) return NULL; |
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81 | if (0 == cxBufferInit(buf, space, capacity, allocator, flags)) { |
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82 | return buf; |
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83 | } else { |
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84 | cxFree(allocator, buf); |
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85 | return NULL; |
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86 | } |
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87 | } |
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88 | |
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89 | void cxBufferFree(CxBuffer *buffer) { |
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90 | if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) { |
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91 | cxFree(buffer->allocator, buffer->bytes); |
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92 | } |
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93 | cxFree(buffer->allocator, buffer); |
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94 | } |
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95 | |
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96 | int cxBufferSeek( |
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97 | CxBuffer *buffer, |
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98 | off_t offset, |
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99 | int whence |
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100 | ) { |
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101 | size_t npos; |
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102 | switch (whence) { |
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103 | case SEEK_CUR: |
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104 | npos = buffer->pos; |
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105 | break; |
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106 | case SEEK_END: |
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107 | npos = buffer->size; |
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108 | break; |
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109 | case SEEK_SET: |
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110 | npos = 0; |
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111 | break; |
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112 | default: |
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113 | return -1; |
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114 | } |
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115 | |
70 | 116 | size_t opos = npos; |
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117 | npos += offset; |
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118 | |
70 | 119 | if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) { |
120 | return -1; | |
121 | } | |
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122 | |
70 | 123 | if (npos >= buffer->size) { |
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124 | return -1; |
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125 | } else { |
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126 | buffer->pos = npos; |
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127 | return 0; |
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128 | } |
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129 | |
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130 | } |
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131 | |
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132 | void cxBufferClear(CxBuffer *buffer) { |
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133 | memset(buffer->bytes, 0, buffer->size); |
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134 | buffer->size = 0; |
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135 | buffer->pos = 0; |
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136 | } |
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137 | |
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138 | int cxBufferEof(CxBuffer const *buffer) { |
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139 | return buffer->pos >= buffer->size; |
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140 | } |
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141 | |
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142 | int cxBufferMinimumCapacity( |
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143 | CxBuffer *buffer, |
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144 | size_t newcap |
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145 | ) { |
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146 | if (newcap <= buffer->capacity) { |
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147 | return 0; |
70 | 148 | } |
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149 | |
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150 | if (cxReallocate(buffer->allocator, |
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151 | (void **) &buffer->bytes, newcap) == 0) { |
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152 | buffer->capacity = newcap; |
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153 | return 0; |
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154 | } else { |
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155 | return -1; |
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156 | } |
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157 | } |
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158 | |
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159 | /** |
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160 | * Helps flushing data to the flush target of a buffer. |
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161 | * |
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162 | * @param buffer the buffer containing the config |
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163 | * @param space the data to flush |
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164 | * @param size the element size |
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165 | * @param nitems the number of items |
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166 | * @return the number of items flushed |
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167 | */ |
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168 | static size_t cx_buffer_write_flush_helper( |
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169 | CxBuffer *buffer, |
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170 | unsigned char const *space, |
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171 | size_t size, |
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172 | size_t nitems |
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173 | ) { |
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174 | size_t pos = 0; |
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175 | size_t remaining = nitems; |
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176 | size_t max_items = buffer->flush_blksize / size; |
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177 | while (remaining > 0) { |
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178 | size_t items = remaining > max_items ? max_items : remaining; |
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179 | size_t flushed = buffer->flush_func( |
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180 | space + pos, |
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181 | size, items, |
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182 | buffer->flush_target); |
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183 | if (flushed > 0) { |
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184 | pos += (flushed * size); |
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185 | remaining -= flushed; |
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186 | } else { |
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187 | // if no bytes can be flushed out anymore, we give up |
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188 | break; |
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189 | } |
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190 | } |
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191 | return nitems - remaining; |
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192 | } |
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193 | |
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194 | size_t cxBufferWrite( |
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195 | void const *ptr, |
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196 | size_t size, |
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197 | size_t nitems, |
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198 | CxBuffer *buffer |
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199 | ) { |
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200 | // optimize for easy case |
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201 | if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) { |
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202 | memcpy(buffer->bytes + buffer->pos, ptr, nitems); |
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203 | buffer->pos += nitems; |
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204 | if (buffer->pos > buffer->size) { |
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205 | buffer->size = buffer->pos; |
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206 | } |
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207 | return nitems; |
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208 | } |
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209 | |
505 | 210 | size_t len; |
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211 | size_t nitems_out = nitems; |
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212 | if (cx_szmul(size, nitems, &len)) { |
505 | 213 | return 0; |
214 | } | |
70 | 215 | size_t required = buffer->pos + len; |
216 | if (buffer->pos > required) { | |
217 | return 0; | |
218 | } | |
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219 | |
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220 | bool perform_flush = false; |
70 | 221 | if (required > buffer->capacity) { |
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222 | if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND && required) { |
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223 | if (buffer->flush_blkmax > 0 && required > buffer->flush_threshold) { |
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224 | perform_flush = true; |
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225 | } else { |
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226 | if (cxBufferMinimumCapacity(buffer, required)) { |
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227 | return 0; |
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228 | } |
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229 | } |
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230 | } else { |
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231 | if (buffer->flush_blkmax > 0) { |
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232 | perform_flush = true; |
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233 | } else { |
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234 | // truncate data to be written, if we can neither extend nor flush |
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235 | len = buffer->capacity - buffer->pos; |
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236 | if (size > 1) { |
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237 | len -= len % size; |
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238 | } |
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239 | nitems_out = len / size; |
70 | 240 | } |
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241 | } |
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242 | } |
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243 | |
70 | 244 | if (len == 0) { |
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245 | return len; |
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246 | } |
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247 | |
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248 | if (perform_flush) { |
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249 | size_t flush_max; |
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250 | if (cx_szmul(buffer->flush_blkmax, buffer->flush_blksize, &flush_max)) { |
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251 | return 0; |
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252 | } |
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253 | size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL |
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254 | ? buffer->pos |
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255 | : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos); |
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256 | if (flush_pos == buffer->pos) { |
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257 | // entire buffer has been flushed, we can reset |
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258 | buffer->size = buffer->pos = 0; |
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259 | |
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260 | size_t items_flush; // how many items can also be directly flushed |
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261 | size_t items_keep; // how many items have to be written to the buffer |
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262 | |
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263 | items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size; |
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264 | if (items_flush > 0) { |
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265 | items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size); |
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266 | // in case we could not flush everything, keep the rest |
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267 | } |
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268 | items_keep = nitems - items_flush; |
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269 | if (items_keep > 0) { |
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270 | // try again with the remaining stuff |
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271 | unsigned char const *new_ptr = ptr; |
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272 | new_ptr += items_flush * size; |
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273 | // report the directly flushed items as written plus the remaining stuff |
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274 | return items_flush + cxBufferWrite(new_ptr, size, items_keep, buffer); |
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275 | } else { |
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276 | // all items have been flushed - report them as written |
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277 | return nitems; |
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278 | } |
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279 | } else if (flush_pos == 0) { |
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280 | // nothing could be flushed at all, we immediately give up without writing any data |
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281 | return 0; |
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282 | } else { |
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283 | // we were partially successful, we shift left and try again |
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284 | cxBufferShiftLeft(buffer, flush_pos); |
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285 | return cxBufferWrite(ptr, size, nitems, buffer); |
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286 | } |
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287 | } else { |
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288 | memcpy(buffer->bytes + buffer->pos, ptr, len); |
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289 | buffer->pos += len; |
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290 | if (buffer->pos > buffer->size) { |
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291 | buffer->size = buffer->pos; |
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292 | } |
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293 | return nitems_out; |
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294 | } |
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295 | |
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296 | } |
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297 | |
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298 | int cxBufferPut( |
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299 | CxBuffer *buffer, |
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300 | int c |
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301 | ) { |
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302 | c &= 0xFF; |
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303 | unsigned char const ch = c; |
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304 | if (cxBufferWrite(&ch, 1, 1, buffer) == 1) { |
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305 | return c; |
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306 | } else { |
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307 | return EOF; |
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308 | } |
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309 | } |
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310 | |
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311 | size_t cxBufferPutString( |
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312 | CxBuffer *buffer, |
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313 | const char *str |
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314 | ) { |
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315 | return cxBufferWrite(str, 1, strlen(str), buffer); |
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316 | } |
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317 | |
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318 | size_t cxBufferRead( |
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319 | void *ptr, |
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320 | size_t size, |
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321 | size_t nitems, |
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322 | CxBuffer *buffer |
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323 | ) { |
505 | 324 | size_t len; |
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325 | if (cx_szmul(size, nitems, &len)) { |
505 | 326 | return 0; |
327 | } | |
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328 | if (buffer->pos + len > buffer->size) { |
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329 | len = buffer->size - buffer->pos; |
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330 | if (size > 1) len -= len % size; |
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331 | } |
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332 | |
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333 | if (len <= 0) { |
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334 | return len; |
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335 | } |
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336 | |
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337 | memcpy(ptr, buffer->bytes + buffer->pos, len); |
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338 | buffer->pos += len; |
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339 | |
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340 | return len / size; |
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341 | } |
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342 | |
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343 | int cxBufferGet(CxBuffer *buffer) { |
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344 | if (cxBufferEof(buffer)) { |
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345 | return EOF; |
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346 | } else { |
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347 | int c = buffer->bytes[buffer->pos]; |
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348 | buffer->pos++; |
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349 | return c; |
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350 | } |
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351 | } |
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352 | |
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353 | int cxBufferShiftLeft( |
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354 | CxBuffer *buffer, |
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355 | size_t shift |
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356 | ) { |
505 | 357 | if (shift >= buffer->size) { |
358 | buffer->pos = buffer->size = 0; | |
359 | } else { | |
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360 | memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift); |
505 | 361 | buffer->size -= shift; |
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362 | |
505 | 363 | if (buffer->pos >= shift) { |
364 | buffer->pos -= shift; | |
365 | } else { | |
366 | buffer->pos = 0; | |
367 | } | |
368 | } | |
369 | return 0; | |
370 | } | |
371 | ||
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372 | int cxBufferShiftRight( |
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373 | CxBuffer *buffer, |
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374 | size_t shift |
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375 | ) { |
505 | 376 | size_t req_capacity = buffer->size + shift; |
377 | size_t movebytes; | |
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378 | |
505 | 379 | // auto extend buffer, if required and enabled |
380 | if (buffer->capacity < req_capacity) { | |
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381 | if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) { |
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382 | if (cxBufferMinimumCapacity(buffer, req_capacity)) { |
505 | 383 | return 1; |
384 | } | |
385 | movebytes = buffer->size; | |
386 | } else { | |
387 | movebytes = buffer->capacity - shift; | |
388 | } | |
389 | } else { | |
390 | movebytes = buffer->size; | |
391 | } | |
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392 | |
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parents:
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393 | memmove(buffer->bytes + shift, buffer->bytes, movebytes); |
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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394 | buffer->size = shift + movebytes; |
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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395 | |
505 | 396 | buffer->pos += shift; |
397 | if (buffer->pos > buffer->size) { | |
398 | buffer->pos = buffer->size; | |
399 | } | |
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400 | |
505 | 401 | return 0; |
402 | } | |
403 | ||
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ucx 3 update, basic dav commands work, most stuff is still broken
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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404 | int cxBufferShift( |
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ucx 3 update, basic dav commands work, most stuff is still broken
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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405 | CxBuffer *buffer, |
efbd59642577
ucx 3 update, basic dav commands work, most stuff is still broken
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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406 | off_t shift |
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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407 | ) { |
505 | 408 | if (shift < 0) { |
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ucx 3 update, basic dav commands work, most stuff is still broken
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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409 | return cxBufferShiftLeft(buffer, (size_t) (-shift)); |
505 | 410 | } else if (shift > 0) { |
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ucx 3 update, basic dav commands work, most stuff is still broken
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
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411 | return cxBufferShiftRight(buffer, (size_t) shift); |
505 | 412 | } else { |
413 | return 0; | |
414 | } | |
415 | } |