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annotate src/strhelp.h @ 20:df7936065450

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Add default title
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 30 Mar 2016 16:56:18 +0200
parents 8b4c49c92451
children 53090844eddd
rev   line source
3
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1 /* Copyright (C) 2015 by ETH Zürich
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8 #ifndef STRHELP_H
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9 #define STRHELP_H
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10
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11 #ifdef __cplusplus
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12 extern "C" {
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13 #endif
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14
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15 #include <stdbool.h>
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16 #include <stddef.h>
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17
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18 /**
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19 * @file strhelp.h
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20 * @brief Helper functions for c strings and memory management
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21 * @details strhelp contains terminating memory allocation functions and
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22 * some conveniance functions to work with c strings or arrays of c
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23 * strings.
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24 */
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25
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26 /** @def To avoid that a compiler optimizes certain memset calls away */
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27 #define wipememory2(_ptr,_set,_len) do { \
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28 volatile char *_vptr=(volatile char *)(_ptr); \
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29 size_t _vlen=(_len); \
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30 while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \
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31 } while(0)
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32 /** @def To avoid that a compiler optimizes certain memset calls away */
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33 #define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
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34
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35
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36 void *xmalloc( size_t n );
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37 /** @brief like malloc but initalizes the values with 0 */
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38 void *xmalloc0( size_t n );
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39 void *xrealloc( void *a, size_t n );
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40 void *xcalloc( size_t n, size_t m );
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41 char *xstrndup( const char *string, const size_t len );
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42 void xfree ( void *p );
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43
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44 /**
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45 * @brief Terminating variant of asprintf
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46 *
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47 * This function behaves exactly like asprintf(3) but will terminate
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48 * when an error occures (usally that means that memoy allocation
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49 * failed).
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50 */
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51 int xasprintf (char **strp, const char *fmt, ...);
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52
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53 /**
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54 * @brief Returns the length of the given %NULL-terminated
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55 * string array str_array.
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56 * @param[in] str_array a %NULL-terminated array of strings
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57 * @returns length of str_array.
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58 */
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59 unsigned int strv_length (char **str_array);
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60
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61 /**
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62 * @brief append a string to a NULL terminated array of strings.
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63 *
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64 * @param[in,out] pArray pointer to the NULL terminated list of string pointers.
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65 * @param[in] string pointer to the string to append to the list.
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66 * @param[in] len length of the string to append to the list
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67 */
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68 void strv_append (char ***pArray, const char *string, const size_t len);
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69
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70 /**
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71 * @brief append a string to another string.
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72 *
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73 * @param[in,out] pDst pointer to the string to be extended.
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74 * @param[in,out] dst_len length of the dst string. Will be modified.
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75 * @param[in] appendage pointer to the string to append.
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76 * @param[in] len length of the string to append.
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77 */
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78 void str_append_str (char **pDst, size_t *dst_len, const char *appendage,
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79 const size_t len);
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80
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81 /**
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82 * @brief Frees the given %NULL-terminated string array.
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83 * @param[in,out] str_array a %NULL-terminated array of strings
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84 */
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85 void strv_free (char **str_array);
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86
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87 /**
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88 * @brief Checks whether two strings exactly match
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89 * @param[in] s1 the first string
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90 * @param[in] s2 the second string
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91 * @returns true if s1 and s2 are equal
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92 */
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93 bool str_equal (char *s1, char *s2);
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94
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95 /**
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96 * @brief Checks whether s2 exactly matches the beginning of s1.
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97 * @param[in] s1 the string who's beginning is searched
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98 * @param[in] s2 the string which is searched for
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99 * @returns true if s1 starts with s2, false otherwise
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100 */
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101 bool str_starts_with (char *s1, char *s2);
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102
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103 /**
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104 * @brief Trims all white space from the start and end of string.
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105 * @details the start of the string is trimmed by setting *s to the
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106 * first non white space character. The end is trimmed by setting the
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107 * first character after the last non white space character to \0.
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108 * @param[in,out] s ponter to the string to strip
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109 */
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110 bool str_trim (char **s);
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111
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112 /** @brief decode base64 encoded data
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113 *
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114 * The memory allocated for dest needs to be free'd by the
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115 * caller.
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116 *
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117 * _Input warning:_
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118 * If the input contains invalid base64 characters an error
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119 * is returned.
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120 *
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121 * If the input is invalid base64 but consists of valid
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122 * base64 characters _no error_ is returned and dst contains
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123 * the valid input up to the error.
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124 *
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125 * @param [out] dst Pointer to the destination. Needs to be NULL
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126 * @param [out] dst_size Size allocated for the destination.
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127 * @param [in] src Pointer to the base64 encoded data.
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128 * @param [in] src_size Size of the encoded data.
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129 *
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130 * @returns 0 on success a polarssl error or -1 otherwise
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131 */
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132 int str_base64_decode(char **dst, size_t *dst_size, char *src,
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133 size_t src_size);
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134
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135 #ifdef WIN32
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136
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137 /** @brief convert a utf8 string to utf16 wchar
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138 *
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139 * @param[in] string utf8 string. Must be at least len characters long.
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140 * @param[in] len number of characters to be converted.
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141 *
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142 * @returns pointer to a newly allocated wchar array. NULL on error.
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143 *
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144 **/
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145 wchar_t *utf8_to_wchar (const char *string, size_t len);
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146
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147 /** @brief convert a local 8 bit (acp) string to utf16 wchar
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148 *
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149 * @param[in] string acp string. Must be at least len characters long.
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150 * @param[in] len number of characters to be converted.
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151 *
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152 * @returns pointer to a newly allocated wchar array. NULL on error.
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153 *
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154 **/
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155 wchar_t *acp_to_wchar (const char *string, size_t len);
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156
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157 /** @brief convert a utf16 string to utf8
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158 *
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159 * @param[in] string utf16 string. Must be at least len characters long.
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160 * @param[in] len number of characters to be converted.
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161 *
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162 * @returns pointer to a newly allocated char array. NULL on error.
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163 *
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164 **/
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165 char *wchar_to_utf8 (const wchar_t *string, size_t len);
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166 #endif
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167
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168 #ifdef __cplusplus
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169 }
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170 #endif
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171
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172 #endif
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173
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