docs/src/modules-ucx2.md

Sat, 30 Apr 2022 08:40:40 +0200

author
Mike Becker <universe@uap-core.de>
date
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fix doc error for cxBufferWrite

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1 ---
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2 title: UCX 2.1 Modules
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3 ---
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4
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5 UCX 2.1 provided several modules for data structures and algorithms.
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6 You may choose to use specific modules by inclueding the corresponding header
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7 file.
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8 Please note, that some modules make use of other UCX 2.1 modules.
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9 For instance, the [Allocator](#allocator) module is used by many other modules
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10 to allow flexible memory allocation.
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11 By default the header files are placed into an `ucx` directory within your
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12 systems include directory. In this case you can use a module by including it
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13 via `#include <ucx/MODULENAME.h>`.
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14 Required modules are included automatically.
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15
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16 <div id="modules" align="center">
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17
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18 ----------------------- ---------------------- -------------------------------- ---------------------------
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19 [String](#string) [Buffer](#buffer)
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20 [Allocator](#allocator) [Stack](#stack) [Memory&nbsp;Pool](#memory-pool)
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21 [Array](#array) [List](#list) [Map](#map) [AVL&nbsp;Tree](#avl-tree)
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22 [Logging](#logging) [Testing](#testing) [Utilities](#utilities) [Properties](#properties)
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23 ----------------------- ---------------------- -------------------------------- ---------------------------
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24
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25 </div>
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26
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27 ## Allocator
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28
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29 *Header file:* [allocator.h](api-2.1/allocator_8h.html)
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30 *Required modules:* None.
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31
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32 A UCX allocator consists of a pointer to the memory area / pool and four
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33 function pointers to memory management functions operating on this memory
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34 area / pool. These functions shall behave equivalent to the standard libc
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35 functions `malloc`, `calloc`, `realloc` and `free`.
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36
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37 The signature of the memory management functions is based on the signature
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38 of the respective libc function but each of them takes the pointer to the
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39 memory area / pool as first argument.
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40
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41 As the pointer to the memory area / pool can be arbitrarily chosen, any data
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42 can be provided to the memory management functions. One example is the
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43 [UCX Memory Pool](#memory-pool).
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44
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45 ## Array
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46
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47 *Header file:* [array.h](api-2.1/array_8h.html)
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48 *Required modules:* [Allocator](#allocator)
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49
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50 The UCX Array is an implementation of a dynamic array with automatic
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51 reallocation. The array structure contains a capacity, the current size,
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52 the size of each element, the raw pointer to the memory area and an allocator.
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53 Arrays are in most cases much faster than linked list.
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54 One can decide, whether to create a new array on the heap with `ucx_array_new()`
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55 or to save one indirection by initializing a `UcxArray` structure on the stack
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56 with `ucx_array_init()`.
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57
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58 ### Remove duplicates from an array of strings
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59
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60 The following example shows, how a `UcxArray` can be built with
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61 a standard dynamic C array (pointer+length) as basis.
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62
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63 ```C
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64 UcxArray* create_unique(sstr_t* array, size_t arrlen) {
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65 // worst case is no duplicates, hence the capacity is set to arrlen
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66 UcxArray* result = ucx_array_new(arrlen, sizeof(sstr_t));
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67 // only append elements, if they are not already present in the array
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68 for (size_t i = 0 ; i < arrlen ; ++i) {
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69 if (!ucx_array_contains(result, array+i, ucx_cmp_sstr, NULL)) {
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70 ucx_array_append_from(result, array+i, 1);
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71 }
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72 }
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73 // make the array as small as possible
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74 ucx_array_shrink(result);
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75 return result;
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76 }
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77
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78 /* ... */
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79
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80 sstr_t* array = /* some standard array of strings */
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81 size_t arrlen = /* the length of the array */
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82
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83 UcxArray* result = create_unique(array,arrlen);
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84
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85 /* Iterate over the array and print the elements */
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86 sstr_t* unique = result->data;
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87 for (size_t i = 0 ; i < result->size ; i++) {
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88 printf("%" PRIsstr "\n", SFMT(unique[i]));
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89 }
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90
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91 /* Free the array. */
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92 ucx_array_free(result);
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93 ```
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94 ### Preventing out of bounds writes
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95
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96 The functions `ucx_array_reserve()`, `ucx_array_resize()`, `ucx_array_grow()`,
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97 and `ucx_array_shrink()` allow easy management of the array capacity.
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98 Imagine you want to add `n` elements to an array. If your `n` elements are
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99 already somewhere else consecutively in memory, you can use
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100 `ucx_array_append_from()` and benefit from the autogrow facility in this family
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101 of functions. Otherwise, you can ask the array to have enough capacity for
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102 holding additional `n` elements.
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103
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104 ```C
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105 size_t n = // ... elements to add
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106 if (ucx_array_grow(array, n)) {
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107 fprintf(stderr, "Cannot add %zu elements to the array.\n", n);
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108 return 1;
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109 }
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110 for (size_t i = 0 ; i < n ; i++) {
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111 ((int*)array->data)[array->size++] = 80;
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112 }
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113 ```
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114
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115 ## AVL Tree
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116
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117 *Header file:* [avl.h](api-2.1/avl_8h.html)
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118 *Required modules:* [Allocator](#allocator)
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119
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120 This binary search tree implementation allows average O(1) insertion and
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121 removal of elements (excluding binary search time).
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122 All common binary tree operations are implemented. Furthermore, this module
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123 provides search functions via lower and upper bounds.
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124
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125 ### Filtering items with a time window
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126
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127 Suppose you have a list of items which contain a `time_t` value and your task
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128 is to find all items within a time window `[t_start, t_end]`.
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129 With AVL Trees this is easy:
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130 ```C
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131 /* ---------------------
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132 * Somewhere in a header
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133 */
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134 typedef struct {
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135 time_t ts;
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136 /* other important data */
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137 } MyObject;
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138
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139 /* -----------
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140 * Source code
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141 */
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142
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143 UcxAVLTree* tree = ucx_avl_new(ucx_cmp_longint);
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144 /* ... populate tree with objects, use '& MyObject.ts' as key ... */
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145
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146
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147 /* Now find every item, with 30 <= ts <= 70 */
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148 time_t ts_start = 30;
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149 time_t ts_end = 70;
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150
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151 printf("Values in range:\n");
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152 for (
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153 UcxAVLNode* node = ucx_avl_find_node(
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154 tree, (intptr_t) &ts_start,
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155 ucx_dist_longint, UCX_AVL_FIND_LOWER_BOUNDED);
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156 node && (*(time_t*)node->key) <= ts_end;
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157 node = ucx_avl_succ(node)
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158 ) {
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159 printf(" ts: %ld\n", ((MyObject*)node->value)->ts);
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160 }
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161
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162 ucx_avl_free_content(tree, free);
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163 ucx_avl_free(tree);
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164 ```
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165
259
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166 ## Buffer
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167
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168 *Header file:* [buffer.h](api-2.1/buffer_8h.html)
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169 *Required modules:* None.
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170
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171 Instances of this buffer implementation can be used to read from or to write to
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172 memory like you would do with a stream. This allows the use of
282
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173 `ucx_stream_copy()` from the [Utilities](#utilities) module to copy contents
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174 from one buffer to another or from file or network streams to the buffer and
259
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175 vice-versa.
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176
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177 More features for convenient use of the buffer can be enabled, like automatic
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178 memory management and automatic resizing of the buffer space.
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179 See the documentation of the macro constants in the header file for more
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180 information.
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181
290
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182 ### Add line numbers to a file
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183
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184 When reading a file line by line, you have three options: first, you could limit
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185 the maximum supported line length.
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186 Second, you allocate a god buffer large
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187 enough for the most lines a text file could have.
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188 And third, undoubtedly the best option, you start with a small buffer, which
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189 adjusts on demand.
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190 An `UcxBuffer` can be created to do just that for you.
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191 Just pass the `UCX_BUFFER_AUTOEXTEND` option to the initialization function.
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192 Here is a full working program, which adds line numbers to a file.
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193 ```C
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194 #include <stdio.h>
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195 #include <ucx/buffer.h>
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196 #include <ucx/utils.h>
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197
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198 int main(int argc, char** argv) {
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199
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200 if (argc != 2) {
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201 fprintf(stderr, "Usage: %s <file>\n", argv[0]);
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202 return 1;
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203 }
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204
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205 FILE* input = fopen(argv[1], "r");
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206 if (!input) {
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207 perror("Canno read input");
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208 return 1;
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209 }
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210
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211 const size_t chunksize = 256;
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212
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213 UcxBuffer* linebuf =
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214 ucx_buffer_new(
294
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215 NULL, /* the buffer should manage the memory area for us */
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216 2*chunksize, /* initial size should be twice the chunk size */
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217 UCX_BUFFER_AUTOEXTEND); /* the buffer will grow when necessary */
290
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218
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219 size_t lineno = 1;
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220 do {
294
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221 /* read line chunk */
290
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222 size_t read = ucx_stream_ncopy(
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223 input, linebuf, fread, ucx_buffer_write, chunksize);
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224 if (read == 0) break;
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225
294
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226 /* handle line endings */
290
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227 do {
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228 sstr_t bufstr = ucx_buffer_to_sstr(linebuf);
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229 sstr_t nl = sstrchr(bufstr, '\n');
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230 if (nl.length == 0) break;
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231
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232 size_t linelen = bufstr.length - nl.length;
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233 sstr_t linestr = sstrsubsl(bufstr, 0, linelen);
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234
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235 printf("%zu: %" PRIsstr "\n", lineno++, SFMT(linestr));
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236
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237 /* shift the buffer to the next line */
290
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238 ucx_buffer_shift_left(linebuf, linelen+1);
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239 } while(1);
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240
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241 } while(1);
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242
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243 /* print the 'noeol' line, if any */
290
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244 sstr_t lastline = ucx_buffer_to_sstr(linebuf);
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245 if (lastline.length > 0) {
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246 printf("%zu: %" PRIsstr, lineno, SFMT(lastline));
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247 }
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248
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249 fclose(input);
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250 ucx_buffer_free(linebuf);
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251
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252 return 0;
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253 }
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254 ```
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255
259
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256 ## List
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257
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258 *Header file:* [list.h](api-2.1/list_8h.html)
259
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259 *Required modules:* [Allocator](#allocator)
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260
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261 This module provides the data structure and several functions for a doubly
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262 linked list. Among the common operations like insert, remove, search and sort,
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263 we allow convenient iteration via a special `UCX_FOREACH` macro.
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264
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265 ### Remove duplicates from an array of strings
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266
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267 Assume you are given an array of `sstr_t` and want to create a list of these
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268 strings without duplicates.
340
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269 This is a similar example to the one [above](#array), but here we are
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270 using a `UcxList`.
294
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271 ```C
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272 #include <stdio.h>
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273 #include <ucx/list.h>
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274 #include <ucx/string.h>
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275 #include <ucx/utils.h>
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276
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277 UcxList* remove_duplicates(sstr_t* array, size_t arrlen) {
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278 UcxList* list = NULL;
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279 for (size_t i = 0 ; i < arrlen ; ++i) {
310
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280 if (ucx_list_find(list, array+i, ucx_cmp_sstr, NULL) == -1) {
294
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281 sstr_t* s = malloc(sizeof(sstr_t));
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282 *s = sstrdup(array[i]);
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283 list = ucx_list_append(list, s);
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284 }
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285 }
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286 return list;
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287 }
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288
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289 /* we will need this function to clean up the list contents later */
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290 void free_sstr(void* ptr) {
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291 sstr_t* s = ptr;
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292 free(s->ptr);
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293 free(s);
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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 sstr_t* array = /* some array of strings */
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299 size_t arrlen = /* the length of the array */
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300
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301 UcxList* list = remove_duplicates(array,arrlen);
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302
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303 /* Iterate over the list and print the elements */
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304 UCX_FOREACH(elem, list) {
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305 sstr_t s = *((sstr_t*)elem->data);
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306 printf("%" PRIsstr "\n", SFMT(s));
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307 }
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308
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309 /* Use our free function to free the duplicated strings. */
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310 ucx_list_free_content(list, free_sstr);
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311 ucx_list_free(list);
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312 ```
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313
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314 ## Logging
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315
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316 *Header file:* [logging.h](api-2.1/logging_8h.html)
259
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317 *Required modules:* [Map](#map), [String](#string)
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318
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319 The logging module comes with some predefined log levels and allows some more
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320 customization. You may choose if you want to get timestamps or source file and
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321 line number logged automatically when outputting a message.
295
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322 The following function call initializes a debug logger with all of the above
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323 information:
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324 ```C
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325 log = ucx_logger_new(stdout, UCX_LOGGER_DEBUG,
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326 UCX_LOGGER_LEVEL | UCX_LOGGER_TIMESTAMP | UCX_LOGGER_SOURCE);
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327 ```
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328 Afterwards you can use this logger with the predefined macros
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329 ```C
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330 ucx_logger_trace(log, "Verbose output");
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331 ucx_logger_debug(log, "Debug message");
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332 ucx_logger_info(log, "Information");
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333 ucx_logger_warn(log, "Warning");
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334 ucx_logger_error(log, "Error message");
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335 ```
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336 or you use
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337 ```C
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338 ucx_logger_log(log, CUSTOM_LEVEL, "Some message")
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339 ```
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340 When you use your custom log level, don't forget to register it with
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341 ```C
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342 ucx_logger_register_level(log, CUSTOM_LEVEL, "CUSTOM")
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343 ```
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344 where the last argument must be a string literal.
259
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345
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346 ## Map
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347
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348 *Header file:* [map.h](api-2.1/map_8h.html)
259
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349 *Required modules:* [Allocator](#allocator), [String](#string)
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350
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351 This module provides a hash map implementation using murmur hash 2 and separate
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352 chaining with linked lists. Similarly to the list module, we provide a
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353 `UCX_MAP_FOREACH` macro to conveniently iterate through the key/value pairs.
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354
298
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355 ### Parsing command line options
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356
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357 Assume you want to parse command line options and record them within a map.
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358 One way to do this is shown by the following code sample:
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359 ```C
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360 UcxMap* options = ucx_map_new(16);
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361 const char *NOARG = "";
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362
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363 char *option = NULL;
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364 char optchar = 0;
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365 for(int i=1;i<argc;i++) {
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366 char *arg = argv[i];
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367 size_t len = strlen(arg);
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368 if(len > 1 && arg[0] == '-') {
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369 for(int c=1;c<len;c++) {
299
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370 if(option) {
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371 fprintf(stderr,
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372 "Missing argument for option -%c\n", optchar);
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373 return 1;
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374 }
298
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375 switch(arg[c]) {
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376 default: {
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377 fprintf(stderr, "Unknown option -%c\n\n", arg[c]);
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378 return 1;
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379 }
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380 case 'v': {
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381 ucx_map_cstr_put(options, "verbose", NOARG);
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382 break;
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383 }
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384 case 'o': {
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385 option = "output";
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386 optchar = 'o';
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387 break;
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388 }
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389 }
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390 }
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391 } else if(option) {
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392 ucx_map_cstr_put(options, option, arg);
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393 option = NULL;
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394 } else {
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395 /* ... handle argument that is not an option ... */
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396 }
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397 }
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398 if(option) {
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399 fprintf(stderr,
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400 "Missing argument for option -%c\n", optchar);
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401 return 1;
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402 }
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403 ```
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404 With the following loop, you can access the previously recorded options:
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405 ```C
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406 UcxMapIterator iter = ucx_map_iterator(options);
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407 char *arg;
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408 UCX_MAP_FOREACH(optkey, arg, iter) {
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409 char* opt = optkey.data;
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410 if (*arg) {
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411 printf("%s = %s\n", opt, arg);
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412 } else {
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413 printf("%s active\n", opt);
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414 }
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415 }
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416 ```
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417 Don't forget to call `ucx_map_free()`, when you are done with the map.
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418
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419 ## Memory Pool
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420
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421 *Header file:* [mempool.h](api-2.1/mempool_8h.html)
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422 *Required modules:* [Allocator](#allocator)
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423
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424 Here we have a concrete allocator implementation in the sense of a memory pool.
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425 This pool allows you to register destructor functions for the allocated memory,
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426 which are automatically called on the destruction of the pool.
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427 But you may also register *independent* destructor functions within a pool in
302
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428 case some external library allocated memory for you, which should be
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429 destroyed together with this pool.
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430
302
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431 Many UCX modules support the use of an allocator.
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432 The [String Module](#string), for instance, provides the `sstrdup_a()` function,
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433 which uses the specified allocator to allocate the memory for the duplicated
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434 string.
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435 This way, you can use a `UcxMempool` to keep track of the memory occupied by
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436 duplicated strings and cleanup everything with just a single call to
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437 `ucx_mempool_destroy()`.
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438
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439 ### Read CSV data into a structure
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440
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441 The following code example shows some of the basic memory pool functions and
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442 how they can be used with other UCX modules.
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443 ```C
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444 #include <stdio.h>
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445 #include <ucx/mempool.h>
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446 #include <ucx/list.h>
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447 #include <ucx/string.h>
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448 #include <ucx/buffer.h>
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449 #include <ucx/utils.h>
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450
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451 typedef struct {
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452 sstr_t column_a;
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453 sstr_t column_b;
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454 sstr_t column_c;
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455 } CSVData;
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456
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457 int main(int argc, char** argv) {
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458
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459 UcxMempool* pool = ucx_mempool_new(128);
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460
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461 FILE *f = fopen("test.csv", "r");
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462 if (!f) {
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463 perror("Cannot open file");
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464 return 1;
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465 }
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466 /* close the file automatically at pool destruction*/
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467 ucx_mempool_reg_destr(pool, f, (ucx_destructor) fclose);
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468
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469 /* create a buffer and register it at the memory pool for destruction */
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470 UcxBuffer* content = ucx_buffer_new(NULL, 256, UCX_BUFFER_AUTOEXTEND);
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471 ucx_mempool_reg_destr(pool, content, (ucx_destructor) ucx_buffer_free);
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472
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473 /* read the file and split it by lines first */
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474 ucx_stream_copy(f, content, fread, ucx_buffer_write);
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475 sstr_t contentstr = ucx_buffer_to_sstr(content);
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476 ssize_t lc = 0;
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477 sstr_t* lines = sstrsplit_a(pool->allocator, contentstr, S("\n"), &lc);
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478
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479 /* skip the header and parse the remaining data */
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480 UcxList* datalist = NULL;
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481 for (size_t i = 1 ; i < lc ; i++) {
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482 if (lines[i].length == 0) continue;
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483 ssize_t fc = 3;
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484 sstr_t* fields = sstrsplit_a(pool->allocator, lines[i], S(";"), &fc);
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485 if (fc != 3) {
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486 fprintf(stderr, "Syntax error in line %zu.\n", i);
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487 ucx_mempool_destroy(pool);
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488 return 1;
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489 }
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490 CSVData* data = ucx_mempool_malloc(pool, sizeof(CSVData));
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491 data->column_a = fields[0];
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492 data->column_b = fields[1];
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493 data->column_c = fields[2];
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494 datalist = ucx_list_append_a(pool->allocator, datalist, data);
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495 }
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496
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497 /* control output */
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498 UCX_FOREACH(elem, datalist) {
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499 CSVData* data = elem->data;
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500 printf("Column A: %" PRIsstr " | "
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501 "Column B: %" PRIsstr " | "
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502 "Column C: %" PRIsstr "\n",
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503 SFMT(data->column_a), SFMT(data->column_b), SFMT(data->column_c)
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504 );
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505 }
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506
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507 /* cleanup everything, no manual free() needed */
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508 ucx_mempool_destroy(pool);
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509
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510 return 0;
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511 }
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512 ```
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513
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514 ### Overriding the default destructor
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515
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516 Sometimes you need to allocate memory with `ucx_mempool_malloc()`, but the
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517 memory is not supposed to be freed with a simple call to `free()`.
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518 In this case, you can overwrite the default destructor as follows:
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519 ```C
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520 MyObject* obj = ucx_mempool_malloc(pool, sizeof(MyObject));
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521
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522 /* some special initialization with own resource management */
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523 my_object_init(obj);
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524
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525 /* register destructor function */
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526 ucx_mempool_set_destr(obj, (ucx_destructor) my_object_destroy);
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527 ```
304
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528 Be aware, that your destructor function should not free any memory, that is
302
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529 also managed by the pool.
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530 Otherwise you might be risking a double-free.
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531 More precisely, a destructor function set with `ucx_mempool_set_destr()` MUST
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532 NOT call `free()` on the specified pointer whereas a desructor function
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533 registered with `ucx_mempool_reg_destr()` MAY (and in most cases will) call
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534 `free()`.
302
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535
259
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536 ## Properties
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537
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538 *Header file:* [properties.h](api-2.1/properties_8h.html)
259
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539 *Required modules:* [Map](#map)
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540
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541 This module provides load and store function for `*.properties` files.
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542 The key/value pairs are stored within an UCX Map.
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543
277
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544 ### Example: Loading properties from a file
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545
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546 ```C
294
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547 /* Open the file as usual */
277
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548 FILE* file = fopen("myprops.properties", "r");
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549 if (!file) {
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550 // error handling
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551 return 1;
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552 }
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553
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554 /* Load the properties from the file */
277
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555 UcxMap* myprops = ucx_map_new(16);
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556 if (ucx_properties_load(myprops, file)) {
294
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557 /* ... error handling ... */
277
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558 fclose(file);
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559 ucx_map_free(myprops);
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560 return 1;
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561 }
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562
294
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563 /* Print out the key/value pairs */
277
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564 char* propval;
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565 UcxMapIterator propiter = ucx_map_iterator(myprops);
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566 UCX_MAP_FOREACH(key, propval, propiter) {
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567 printf("%s = %s\n", (char*)key.data, propval);
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568 }
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569
294
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570 /* Don't forget to free the values before freeing the map */
277
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571 ucx_map_free_content(myprops, NULL);
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572 ucx_map_free(myprops);
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573 fclose(file);
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574 ```
295
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575
259
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576 ## Stack
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577
390
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578 *Header file:* [stack.h](api-2.1/stack_8h.html)
259
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579 *Required modules:* [Allocator](#allocator)
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580
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581 This concrete implementation of an UCX Allocator allows you to grab some amount
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582 of memory which is then handled as a stack.
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583 Please note, that the term *stack* only refers to the behavior of this
301
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584 allocator. You may still choose to use either stack or heap memory
259
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585 for the underlying space.
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586 A typical use case is an algorithm where you need to allocate and free large
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587 amounts of memory very frequently.
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588
301
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589 The following code sample shows how to initialize a stack and push and pop
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590 simple data.
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591 ```C
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592 const size_t len = 1024;
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593 char space[len];
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594 UcxStack stack;
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595 ucx_stack_init(&stack, space, len);
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596
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597 int i = 42;
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598 float f = 3.14f;
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599 const char* str = "Hello!";
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600 size_t strn = 7;
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601
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602 /* push the integer */
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603 ucx_stack_push(&stack, sizeof(int), &i);
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604
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605 /* push the float and rember the address */
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606 float* remember = ucx_stack_push(&stack, sizeof(float), &f);
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607
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608 /* push the string with zero terminator */
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609 ucx_stack_push(&stack, strn, str);
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610
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611 /* if we forget, how big an element was, we can ask the stack */
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612 printf("Length of string: %zu\n", ucx_stack_topsize(&stack)-1);
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613
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614 /* retrieve the string as sstr_t, without zero terminator! */
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615 sstr_t s;
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616 s.length = ucx_stack_topsize(&stack)-1;
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617 s.ptr = malloc(s.length);
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618 ucx_stack_popn(&stack, s.ptr, s.length);
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619 printf("%" PRIsstr "\n", SFMT(s));
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620
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621 /* print the float directly from the stack and free it */
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622 printf("Float: %f\n", *remember);
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623 ucx_stack_free(&stack, remember);
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624
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625 /* the last element is the integer */
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626 int j;
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627 ucx_stack_pop(&stack, &j);
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628 printf("Integer: %d\n", j);
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629 ```
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630
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631
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632
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633 ## String
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634
390
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635 *Header file:* [string.h](api-2.1/string_8h.html)
259
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636 *Required modules:* [Allocator](#allocator)
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637
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638 This module provides a safe implementation of bounded string.
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639 Usually C strings do not carry a length. While for zero-terminated strings you
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640 can easily get the length with `strlen`, this is not generally possible for
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641 arbitrary strings.
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642 The `sstr_t` type of this module always carries the string and its length to
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643 reduce the risk of buffer overflows dramatically.
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644
267
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645 ### Initialization
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646
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647 There are several ways to create an `sstr_t`:
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648
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649 ```C
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650 /* (1) sstr() uses strlen() internally, hence cstr MUST be zero-terminated */
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651 sstr_t a = sstr(cstr);
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652
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653 /* (2) cstr does not need to be zero-terminated, if length is specified */
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654 sstr_t b = sstrn(cstr, len);
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655
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656 /* (3) S() macro creates sstr_t from a string using sizeof() and using sstrn().
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657 This version is especially useful for function arguments */
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658 sstr_t c = S("hello");
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659
325
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660 /* (4) SC() macro works like S(), but makes the string immutable using scstr_t.
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661 (available since UCX 2.0) */
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662 scstr_t d = SC("hello");
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663
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664 /* (5) ST() macro creates sstr_t struct literal using sizeof() */
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665 sstr_t e = ST("hello");
267
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666 ```
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667
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668 You should not use the `S()`, `SC()`, or `ST()` macro with string of unknown
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669 origin, since the `sizeof()` call might not coincide with the string length in
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670 those cases. If you know what you are doing, it can save you some performance,
267
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671 because you do not need the `strlen()` call.
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672
321
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673 ### Handling immutable strings
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674
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675 *(Since: UCX 2.0)*
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676
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677 For immutable strings (i.e. `const char*` strings), UCX provides the `scstr_t`
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678 type, which works exactly as the `sstr_t` type but with a pointer
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679 to `const char`. All UCX string functions come in two flavors: one that enforces
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680 the `scstr_t` type, and another that usually accepts both types and performs
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681 a conversion automatically, if necessary.
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682
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683 There are some exceptions to this rule, as the return type may depend on the
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684 argument type.
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685 E.g. the `sstrchr()` function returns a substring starting at
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686 the first occurrence of the specified character.
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687 Since this substring points to the memory of the argument string, it does not
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688 accept `scstr_t` as input argument, because the return type would break the
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689 constness.
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690
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691
267
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692 ### Finding the position of a substring
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693
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694 The `sstrstr()` function gives you a new `sstr_t` object starting with the
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695 requested substring. Thus determining the position comes down to a simple
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696 subtraction.
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697
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698 ```C
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699 sstr_t haystack = ST("Here we go!");
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700 sstr_t needle = ST("we");
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701 sstr_t result = sstrstr(haystack, needle);
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702 if (result.ptr)
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703 printf("Found at position %zd.\n", haystack.length-result.length);
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704 else
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705 printf("Not found.\n");
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706 ```
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707
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708 ### Spliting a string by a delimiter
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709
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710 The `sstrsplit()` function (and its allocator based version `sstrsplit_a()`) is
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711 very powerful and might look a bit nasty at a first glance. But it is indeed
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712 very simple to use. It is even more convenient in combination with a memory
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713 pool.
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714
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715 ```C
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716 sstr_t test = ST("here::are::some::strings");
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717 sstr_t delim = ST("::");
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718
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719 ssize_t count = 0; /* no limit */
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720 UcxMempool* pool = ucx_mempool_new_default();
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721
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722 sstr_t* result = sstrsplit_a(pool->allocator, test, delim, &count);
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723 for (ssize_t i = 0 ; i < count ; i++) {
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724 /* don't forget to specify the length via the %*s format specifier */
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725 printf("%*s\n", result[i].length, result[i].ptr);
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726 }
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diff changeset
727
f4789572c9d6 restructures documentation + adds some examples for sstr_t
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diff changeset
728 ucx_mempool_destroy(pool);
f4789572c9d6 restructures documentation + adds some examples for sstr_t
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diff changeset
729 ```
f4789572c9d6 restructures documentation + adds some examples for sstr_t
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diff changeset
730 The output is:
f4789572c9d6 restructures documentation + adds some examples for sstr_t
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diff changeset
731
f4789572c9d6 restructures documentation + adds some examples for sstr_t
Mike Becker <universe@uap-core.de>
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diff changeset
732 here
f4789572c9d6 restructures documentation + adds some examples for sstr_t
Mike Becker <universe@uap-core.de>
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diff changeset
733 are
f4789572c9d6 restructures documentation + adds some examples for sstr_t
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diff changeset
734 some
f4789572c9d6 restructures documentation + adds some examples for sstr_t
Mike Becker <universe@uap-core.de>
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diff changeset
735 strings
f4789572c9d6 restructures documentation + adds some examples for sstr_t
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diff changeset
736
f4789572c9d6 restructures documentation + adds some examples for sstr_t
Mike Becker <universe@uap-core.de>
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diff changeset
737 The memory pool ensures, that all strings are freed.
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738
325
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739 ### Disabling convenience macros
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740
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741 If you are experiencing any troubles with the short convenience macros `S()`,
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742 `SC()`, or `ST()`, you can disable them by setting the macro
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743 `UCX_NO_SSTR_SHORTCUTS` before including the header (or via a compiler option).
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744 For the formatting macros `SFMT()` and `PRIsstr` you can use the macro
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745 `UCX_NO_SSTR_FORMAT_MACROS` to disable them.
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746
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diff changeset
747 Please keep in mind, that after disabling the macros, you cannot use them in
a3e63cb21e20 changes sstr shortcut macros s.t. they distinguish sstr_t and scstr_t + add macros which can completely disable the shortcuts
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748 your code *and* foreign code that you might have included.
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749 You should only disable the macros, if you are experiencing a nasty name clash
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750 which cannot be otherwise resolved.
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751
259
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752 ## Testing
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753
390
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754 *Header file:* [test.h](api-2.1/test_8h.html)
259
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755 *Required modules:* None.
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756
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757 This module provides a testing framework which allows you to execute test cases
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758 within test suites.
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759 To avoid code duplication within tests, we also provide the possibility to
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760 define test subroutines.
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761
297
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762 You should declare test cases and subroutines in a header file per test unit
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763 and implement them as you would implement normal functions.
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764 ```C
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765 /* myunit.h */
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766 UCX_TEST(function_name);
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767 UCX_TEST_SUBROUTINE(subroutine_name, paramlist); /* optional */
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768
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diff changeset
769
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770 /* myunit.c */
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771 UCX_TEST_SUBROUTINE(subroutine_name, paramlist) {
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772 /* ... reusable tests with UCX_TEST_ASSERT() ... */
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773 }
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774
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775 UCX_TEST(function_name) {
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diff changeset
776 /* ... resource allocation and other test preparation ... */
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777
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778 /* mandatory marker for the start of the tests */
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779 UCX_TEST_BEGIN
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diff changeset
780
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diff changeset
781 /* ... verifications with UCX_TEST_ASSERT() ...
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782 * (and/or calls with UCX_TEST_CALL_SUBROUTINE())
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783 */
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diff changeset
784
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785 /* mandatory marker for the end of the tests */
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diff changeset
786 UCX_TEST_END
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diff changeset
787
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diff changeset
788 /* ... resource cleanup ...
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789 * (all code after UCX_TEST_END is always executed)
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790 */
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791 }
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792 ```
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793 If you want to use the `UCX_TEST_ASSERT()` macro in a function, you are
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diff changeset
794 *required* to use a `UCX_TEST_SUBROUTINE`.
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diff changeset
795 Otherwise the testing framework does not know where to jump, when the assertion
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diff changeset
796 fails.
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diff changeset
797
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diff changeset
798 After implementing the tests, you can easily build a test suite and execute it:
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799 ```C
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800 UcxTestSuite* suite = ucx_test_suite_new();
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801 ucx_test_register(suite, testMyTestCase01);
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802 ucx_test_register(suite, testMyTestCase02);
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803 /* ... */
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804 ucx_test_run(suite, stdout); /* stdout, or any other FILE stream */
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805 ```
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806
259
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807 ## Utilities
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808
390
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809 *Header file:* [utils.h](api-2.1/utils_8h.html)
259
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810 *Required modules:* [Allocator](#allocator), [String](#string)
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811
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diff changeset
812 In this module we provide very general utility function for copy and compare
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813 operations.
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814 We also provide several `printf` variants to conveniently print formatted data
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815 to streams or strings.
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816
279
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817 ### A simple copy program
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818
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819 The utilities package provides several stream copy functions.
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820 One of them has a very simple interface and can, for instance, be used to copy
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821 whole files in a single call.
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diff changeset
822 This is a minimal working example:
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823 ```C
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824 #include <stdio.h>
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825 #include <ucx/utils.h>
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826
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diff changeset
827 int main(int argc, char** argv) {
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828
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829 if (argc != 3) {
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830 fprintf(stderr, "Use %s <src> <dest>", argv[0]);
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831 return 1;
ee37b179e597 doc: MWE for ucx_stream_copy()
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832 }
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833
294
bfa935ab7f85 example code for the usage of a UcxList
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834 FILE *srcf = fopen(argv[1], "r"); /* insert error handling on your own */
279
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diff changeset
835 FILE *destf = fopen(argv[2], "w");
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836
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diff changeset
837 size_t n = ucx_stream_copy(srcf, destf, fread, fwrite);
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838 printf("%zu bytes copied.\n", n);
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839
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diff changeset
840 fclose(srcf);
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diff changeset
841 fclose(destf);
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842
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843
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diff changeset
844 return 0;
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845 }
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846 ```
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847
281
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848 ### Automatic allocation for formatted strings
279
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diff changeset
849
281
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850 The UCX utility function `ucx_asprintf()` and it's convenient shortcut
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851 `ucx_sprintf` allow easy formatting of strings, without ever having to worry
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852 about the required space.
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853 ```C
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854 sstr_t mystring = ucx_sprintf("The answer is: %d!", 42);
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855 ```
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856 Still, you have to pass `mystring.ptr` to `free()` (or the free function of
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857 your allocator, if you use `ucx_asprintf`).
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858 If you don't have all the information ready to build your string, you can even
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diff changeset
859 use a [UcxBuffer](#buffer) as a target with the utility function
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diff changeset
860 `ucx_bprintf()`.
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861 ```C
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862 UcxBuffer* strbuffer = ucx_buffer_new(NULL, 512, UCX_BUFFER_AUTOEXTEND);
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863
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864 for (unsigned int i = 2 ; i < 100 ; i++) {
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parents: 280
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865 ucx_bprintf(strbuffer, "Integer %d is %s\n",
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parents: 280
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866 i, prime(i) ? "prime" : "not prime");
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parents: 280
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867 }
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parents: 280
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868
294
bfa935ab7f85 example code for the usage of a UcxList
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parents: 290
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869 /* print the result to stdout */
281
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parents: 280
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870 printf("%s", (char*)strbuffer->space);
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Mike Becker <universe@uap-core.de>
parents: 280
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871
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parents: 280
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872 ucx_buffer_free(strbuffer);
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parents: 280
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873 ```

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