ucx/string.h

Tue, 24 Mar 2015 12:02:47 +0100

author
Mike Becker <universe@uap-core.de>
date
Tue, 24 Mar 2015 12:02:47 +0100
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described DavQLStatement grammar + added more features + renamed PUT to SET (for now)

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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 2014 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 * Bounded string implementation.
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30 *
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31 * The UCX strings (<code>sstr_t</code>) provide an alternative to C strings.
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32 * The main difference to C strings is, that <code>sstr_t</code> does <b>not
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33 * need to be <code>NULL</code>-terminated</b>. Instead the length is stored
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34 * within the structure.
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35 *
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36 * When using <code>sstr_t</code>, developers must be full aware of what type
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37 * of string (<code>NULL</code>-terminated) or not) they are using, when
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38 * accessing the <code>char* ptr</code> directly.
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39 *
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40 * The UCX string module provides some common string functions, known from
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41 * standard libc, working with <code>sstr_t</code>.
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42 *
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43 * @file string.h
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44 * @author Mike Becker
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45 * @author Olaf Wintermann
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46 */
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47
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48 #ifndef UCX_STRING_H
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49 #define UCX_STRING_H
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50
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51 #include "ucx.h"
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52 #include "allocator.h"
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53 #include <stddef.h>
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54
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55 /** Shortcut for a <code>sstr_t struct</code> literal. */
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56 #define ST(s) { (char*)s, sizeof(s)-1 }
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57
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58 /** Shortcut for the conversion of a C string to a <code>sstr_t</code>. */
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59 #define S(s) sstrn((char*)s, sizeof(s)-1)
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60
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61 #ifdef __cplusplus
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62 extern "C" {
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63 #endif
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64
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65 /**
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66 * The UCX string structure.
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67 */
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68 typedef struct {
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69 /** A reference to the string (<b>not necessarily <code>NULL</code>
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70 * -terminated</b>) */
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71 char *ptr;
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72 /** The length of the string */
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73 size_t length;
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74 } sstr_t;
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75
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76 /**
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77 * Creates a new sstr_t based on a C string.
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78 *
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79 * The length is implicitly inferred by using a call to <code>strlen()</code>.
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80 *
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81 * <b>Note:</b> the sstr_t will hold a <i>reference</i> to the C string. If you
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82 * do want a copy, use sstrdup() on the return value of this function.
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83 *
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84 * @param cstring the C string to wrap
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85 * @return a new sstr_t containing the C string
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86 *
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87 * @see sstrn()
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88 */
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89 sstr_t sstr(char *cstring);
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90
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91 /**
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92 * Creates a new sstr_t of the specified length based on a C string.
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93 *
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94 * <b>Note:</b> the sstr_t will hold a <i>reference</i> to the C string. If you
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95 * do want a copy, use sstrdup() on the return value of this function.
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96 *
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97 * @param cstring the C string to wrap
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98 * @param length the length of the string
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99 * @return a new sstr_t containing the C string
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100 *
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101 * @see sstr()
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102 * @see S()
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103 */
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104 sstr_t sstrn(char *cstring, size_t length);
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105
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106
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107 /**
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108 * Returns the cumulated length of all specified strings.
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109 *
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110 * At least one string must be specified.
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111 *
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112 * <b>Attention:</b> if the count argument does not match the count of the
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113 * specified strings, the behavior is undefined.
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114 *
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115 * @param count the total number of specified strings (so at least 1)
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116 * @param string the first string
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117 * @param ... all other strings
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118 * @return the cumulated length of all strings
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119 */
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120 size_t sstrnlen(size_t count, sstr_t string, ...);
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121
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122 /**
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123 * Concatenates two or more strings.
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124 *
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125 * The resulting string will be allocated by standard <code>malloc()</code>.
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126 * So developers <b>MUST</b> pass the sstr_t.ptr to <code>free()</code>.
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127 *
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128 * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
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129 * terminated.
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130 *
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131 * @param count the total number of strings to concatenate
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132 * @param s1 first string
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133 * @param s2 second string
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134 * @param ... all remaining strings
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135 * @return the concatenated string
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136 */
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137 sstr_t sstrcat(size_t count, sstr_t s1, sstr_t s2, ...);
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138
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139 /**
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140 * Concatenates two or more strings using an UcxAllocator.
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141 *
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142 * See sstrcat() for details.
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143 *
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144 * @param a the allocator to use
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145 * @param count the total number of strings to concatenate
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146 * @param s1 first string
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147 * @param s2 second string
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148 * @param ... all remaining strings
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149 * @return the concatenated string
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150 */
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151 sstr_t sstrcat_a(UcxAllocator *a, size_t count, sstr_t s1, sstr_t s2, ...);
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152
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153
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154 /**
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155 * Returns a substring starting at the specified location.
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156 *
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157 * <b>Attention:</b> the new string references the same memory area as the
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158 * input string and will <b>NOT</b> be <code>NULL</code>-terminated.
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159 * Use sstrdup() to get a copy.
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160 *
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161 * @param string input string
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162 * @param start start location of the substring
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163 * @return a substring of <code>string</code> starting at <code>start</code>
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164 *
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165 * @see sstrsubsl()
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166 * @see sstrchr()
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167 */
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168 sstr_t sstrsubs(sstr_t string, size_t start);
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169
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170 /**
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171 * Returns a substring with a maximum length starting at the specified location.
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172 *
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173 * <b>Attention:</b> the new string references the same memory area as the
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174 * input string and will <b>NOT</b> be <code>NULL</code>-terminated.
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175 * Use sstrdup() to get a copy.
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176 *
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177 * @param string input string
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178 * @param start start location of the substring
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179 * @param length the maximum length of the substring
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180 * @return a substring of <code>string</code> starting at <code>start</code>
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181 * with a maximum length of <code>length</code>
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182 *
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183 * @see sstrsubs()
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184 * @see sstrchr()
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185 */
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186 sstr_t sstrsubsl(sstr_t string, size_t start, size_t length);
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187
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188 /**
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189 * Returns a substring starting at the location of the first occurrence of the
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190 * specified character.
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191 *
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192 * If the string does not contain the character, an empty string is returned.
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193 *
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194 * @param string the string where to locate the character
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195 * @param chr the character to locate
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196 * @return a substring starting at the first location of <code>chr</code>
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197 *
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198 * @see sstrsubs()
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199 */
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200 sstr_t sstrchr(sstr_t string, int chr);
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201
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202 /**
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203 * Returns a substring starting at the location of the last occurrence of the
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204 * specified character.
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205 *
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206 * If the string does not contain the character, an empty string is returned.
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207 *
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208 * @param string the string where to locate the character
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209 * @param chr the character to locate
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210 * @return a substring starting at the last location of <code>chr</code>
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211 *
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212 * @see sstrsubs()
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213 */
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214 sstr_t sstrrchr(sstr_t string, int chr);
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215
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216 /**
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217 * Splits a string into parts by using a delimiter string.
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218 *
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219 * This function will return <code>NULL</code>, if one of the following happens:
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220 * <ul>
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221 * <li>the string length is zero</li>
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222 * <li>the delimeter length is zero</li>
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223 * <li>the string equals the delimeter</li>
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224 * <li>memory allocation fails</li>
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225 * </ul>
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226 *
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227 * The integer referenced by <code>count</code> is used as input and determines
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228 * the maximum size of the resulting array, i.e. the maximum count of splits to
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229 * perform + 1.
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230 *
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231 * The integer referenced by <code>count</code> is also used as output and is
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232 * set to
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233 * <ul>
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234 * <li>-2, on memory allocation errors</li>
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235 * <li>-1, if either the string or the delimiter is an empty string</li>
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236 * <li>0, if the string equals the delimiter</li>
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237 * <li>1, if the string does not contain the delimiter</li>
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238 * <li>the count of array items, otherwise</li>
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239 * </ul>
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240 *
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241 * If the string starts with the delimiter, the first item of the resulting
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242 * array will be an empty string.
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243 *
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244 * If the string ends with the delimiter and the maximum list size is not
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245 * exceeded, the last array item will be an empty string.
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246 *
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247 * <b>Attention:</b> The array pointer <b>AND</b> all sstr_t.ptr of the array
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248 * items must be manually passed to <code>free()</code>. Use sstrsplit_a() with
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249 * an allocator to managed memory, to avoid this.
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250 *
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251 * @param string the string to split
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252 * @param delim the delimiter string
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253 * @param count IN: the maximum size of the resulting array (0 = no limit),
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254 * OUT: the actual size of the array
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255 * @return a sstr_t array containing the split strings or
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256 * <code>NULL</code> on error
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257 *
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258 * @see sstrsplit_a()
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259 */
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260 sstr_t* sstrsplit(sstr_t string, sstr_t delim, ssize_t *count);
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261
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262 /**
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263 * Performing sstrsplit() using an UcxAllocator.
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264 *
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265 * <i>Read the description of sstrsplit() for details.</i>
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266 *
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267 * The memory for the sstr_t.ptr pointers of the array items and the memory for
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268 * the sstr_t array itself are allocated by using the UcxAllocator.malloc()
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269 * function.
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270 *
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271 * <b>Note:</b> the allocator is not used for memory that is freed within the
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272 * same call of this function (locally scoped variables).
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273 *
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274 * @param allocator the UcxAllocator used for allocating memory
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275 * @param string the string to split
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276 * @param delim the delimiter string
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277 * @param count IN: the maximum size of the resulting array (0 = no limit),
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278 * OUT: the actual size of the array
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279 * @return a sstr_t array containing the split strings or
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280 * <code>NULL</code> on error
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281 *
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282 * @see sstrsplit()
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283 */
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284 sstr_t* sstrsplit_a(UcxAllocator *allocator, sstr_t string, sstr_t delim,
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285 ssize_t *count);
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286
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287 /**
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288 * Compares two UCX strings with standard <code>memcmp()</code>.
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289 *
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290 * At first it compares the sstr_t.length attribute of the two strings. The
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291 * <code>memcmp()</code> function is called, if and only if the lengths match.
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292 *
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293 * @param s1 the first string
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294 * @param s2 the second string
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295 * @return -1, if the length of s1 is less than the length of s2 or 1, if the
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296 * length of s1 is greater than the length of s2 or the result of
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297 * <code>memcmp()</code> otherwise (i.e. 0 if the strings match)
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298 */
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299 int sstrcmp(sstr_t s1, sstr_t s2);
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300
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301 /**
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302 * Compares two UCX strings ignoring the case.
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303 *
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304 * At first it compares the sstr_t.length attribute of the two strings. If and
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305 * only if the lengths match, both strings are compared char by char ignoring
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306 * the case.
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307 *
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308 * @param s1 the first string
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309 * @param s2 the second string
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310 * @return -1, if the length of s1 is less than the length of s2 or 1, if the
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311 * length of s1 is greater than the length of s2 or the difference between the
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312 * first two differing characters otherwise (i.e. 0 if the strings match and
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313 * no characters differ)
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314 */
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315 int sstrcasecmp(sstr_t s1, sstr_t s2);
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316
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317 /**
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318 * Creates a duplicate of the specified string.
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319 *
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320 * The new sstr_t will contain a copy allocated by standard
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321 * <code>malloc()</code>. So developers <b>MUST</b> pass the sstr_t.ptr to
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322 * <code>free()</code>.
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323 *
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324 * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
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325 * terminated.
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326 *
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327 * @param string the string to duplicate
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328 * @return a duplicate of the string
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329 * @see sstrdup_a()
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330 */
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331 sstr_t sstrdup(sstr_t string);
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332
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333 /**
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334 * Creates a duplicate of the specified string using an UcxAllocator.
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335 *
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336 * The new sstr_t will contain a copy allocated by the allocators
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337 * ucx_allocator_malloc function. So it is implementation depended, whether the
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338 * returned sstr_t.ptr pointer must be passed to the allocators
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339 * ucx_allocator_free function manually.
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340 *
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341 * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
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342 * terminated.
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343 *
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344 * @param allocator a valid instance of an UcxAllocator
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345 * @param string the string to duplicate
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346 * @return a duplicate of the string
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347 * @see sstrdup()
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348 */
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349 sstr_t sstrdup_a(UcxAllocator *allocator, sstr_t string);
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350
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351 /**
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352 * Omits leading and trailing spaces.
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353 *
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354 * This function returns a new sstr_t containing a trimmed version of the
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355 * specified string.
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356 *
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357 * <b>Note:</b> the new sstr_t references the same memory, thus you
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358 * <b>MUST NOT</b> pass the sstr_t.ptr of the return value to
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359 * <code>free()</code>. It is also highly recommended to avoid assignments like
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360 * <code>mystr = sstrtrim(mystr);</code> as you lose the reference to the
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361 * source string. Assignments of this type are only permitted, if the
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362 * sstr_t.ptr of the source string does not need to be freed or if another
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363 * reference to the source string exists.
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364 *
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365 * @param string the string that shall be trimmed
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366 * @return a new sstr_t containing the trimmed string
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367 */
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368 sstr_t sstrtrim(sstr_t string);
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369
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370 /**
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371 * Checks, if a string has a specific prefix.
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372 * @param string the string to check
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373 * @param prefix the prefix the string should have
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374 * @return 1, if and only if the string has the specified prefix, 0 otherwise
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375 */
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376 int sstrprefix(sstr_t string, sstr_t prefix);
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377
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378 /**
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379 * Checks, if a string has a specific suffix.
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380 * @param string the string to check
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381 * @param suffix the suffix the string should have
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382 * @return 1, if and only if the string has the specified suffix, 0 otherwise
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383 */
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384 int sstrsuffix(sstr_t string, sstr_t suffix);
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385
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386 #ifdef __cplusplus
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387 }
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388 #endif
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389
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390 #endif /* UCX_STRING_H */

mercurial