Mercurial > retraceit
annotate src/strhelp.h @ 25:64a51a42c01f
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author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Tue, 05 May 2015 17:53:36 +0200 |
parents | 147b08bc7d64 |
children | 9daf778feaf1 |
rev | line source |
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25
64a51a42c01f
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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 |