1 | /* |
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2 | * Copyright (c) 2003-2004, Artem B. Bityuckiy |
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3 | * Copyright (c) 1999,2000, Konstantin Chuguev. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | |
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27 | /* |
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28 | FUNCTION |
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29 | <<iconv>>, <<iconv_open>>, <<iconv_close>>---charset conversion routines |
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30 | |
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31 | INDEX |
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32 | iconv |
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33 | INDEX |
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34 | iconv_open |
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35 | INDEX |
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36 | iconv_close |
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37 | INDEX |
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38 | _iconv_r |
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39 | INDEX |
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40 | _iconv_open_r |
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41 | INDEX |
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42 | _iconv_close_r |
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43 | |
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44 | SYNOPSIS |
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45 | #include <iconv.h> |
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46 | iconv_t iconv_open (const char *<[to]>, const char *<[from]>); |
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47 | int iconv_close (iconv_t <[cd]>); |
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48 | size_t iconv (iconv_t <[cd]>, char **restrict <[inbuf]>, |
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49 | size_t *restrict <[inbytesleft]>, |
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50 | char **restrict <[outbuf]>, |
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51 | size_t *restrict <[outbytesleft]>); |
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52 | |
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53 | iconv_t _iconv_open_r (struct _reent *<[rptr]>, |
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54 | const char *<[to]>, const char *<[from]>); |
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55 | int _iconv_close_r (struct _reent *<[rptr]>, iconv_t <[cd]>); |
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56 | size_t _iconv_r (struct _reent *<[rptr]>, |
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57 | iconv_t <[cd]>, const char **<[inbuf]>, |
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58 | size_t *<[inbytesleft]>, |
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59 | char **<[outbuf]>, size_t *<[outbytesleft]>); |
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60 | |
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61 | DESCRIPTION |
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62 | The function <<iconv>> converts characters from <[in]> which are in one |
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63 | encoding to characters of another encoding, outputting them to <[out]>. |
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64 | The value <[inleft]> specifies the number of input bytes to convert whereas |
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65 | the value <[outleft]> specifies the size remaining in the <[out]> buffer. |
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66 | The conversion descriptor <[cd]> specifies the conversion being performed |
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67 | and is created via <<iconv_open>>. |
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68 | |
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69 | An <<iconv>> conversion stops if: the input bytes are exhausted, the output |
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70 | buffer is full, an invalid input character sequence occurs, or the |
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71 | conversion specifier is invalid. |
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72 | |
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73 | The function <<iconv_open>> is used to specify a conversion from one |
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74 | encoding: <[from]> to another: <[to]>. The result of the call is |
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75 | to create a conversion specifier that can be used with <<iconv>>. |
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76 | |
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77 | The function <<iconv_close>> is used to close a conversion specifier after |
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78 | it is no longer needed. |
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79 | |
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80 | The <<_iconv_r>>, <<_iconv_open_r>>, and <<_iconv_close_r>> functions are |
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81 | reentrant versions of <<iconv>>, <<iconv_open>>, and <<iconv_close>>, |
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82 | respectively. An additional reentrancy struct pointer: <[rptr]> is passed |
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83 | to properly set <<errno>>. |
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84 | |
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85 | RETURNS |
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86 | The <<iconv>> function returns the number of non-identical conversions |
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87 | performed. If an error occurs, (size_t)-1 is returned and <<errno>> |
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88 | is set appropriately. The values of <[inleft]>, <[in]>, <[out]>, |
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89 | and <[outleft]> are modified to indicate how much input was processed |
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90 | and how much output was created. |
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91 | |
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92 | The <<iconv_open>> function returns either a valid conversion specifier |
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93 | or (iconv_t)-1 to indicate failure. If failure occurs, <<errno>> is set |
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94 | appropriately. |
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95 | |
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96 | The <<iconv_close>> function returns 0 on success or -1 on failure. |
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97 | If failure occurs <<errno>> is set appropriately. |
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98 | |
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99 | PORTABILITY |
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100 | <<iconv>>, <<iconv_open>>, and <<iconv_close>> are non-ANSI and are specified |
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101 | by the Single Unix specification. |
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102 | |
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103 | No supporting OS subroutine calls are required. |
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104 | */ |
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105 | #include <_ansi.h> |
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106 | #include <reent.h> |
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107 | #include <sys/types.h> |
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108 | #include <errno.h> |
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109 | #include <string.h> |
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110 | #include <stdlib.h> |
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111 | #include <iconv.h> |
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112 | #include <wchar.h> |
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113 | #include <sys/iconvnls.h> |
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114 | #include "local.h" |
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115 | #include "conv.h" |
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116 | #include "ucsconv.h" |
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117 | |
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118 | /* |
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119 | * iconv interface functions as specified by Single Unix specification. |
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120 | */ |
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121 | |
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122 | iconv_t |
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123 | iconv_open (const char *to, |
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124 | const char *from) |
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125 | { |
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126 | return _iconv_open_r (_REENT, to, from); |
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127 | } |
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128 | |
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129 | |
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130 | size_t |
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131 | iconv (iconv_t cd, |
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132 | char **__restrict inbuf, |
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133 | size_t *__restrict inbytesleft, |
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134 | char **__restrict outbuf, |
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135 | size_t *__restrict outbytesleft) |
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136 | { |
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137 | return _iconv_r (_REENT, cd, (const char **) inbuf, inbytesleft, |
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138 | outbuf, outbytesleft); |
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139 | } |
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140 | |
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141 | |
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142 | int |
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143 | iconv_close (iconv_t cd) |
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144 | { |
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145 | return _iconv_close_r (_REENT, cd); |
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146 | } |
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147 | |
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148 | |
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149 | #ifndef _REENT_ONLY |
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150 | iconv_t |
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151 | _iconv_open_r (struct _reent *rptr, |
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152 | const char *to, |
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153 | const char *from) |
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154 | { |
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155 | iconv_conversion_t *ic; |
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156 | |
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157 | if (to == NULL || from == NULL || *to == '\0' || *from == '\0') |
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158 | return (iconv_t)-1; |
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159 | |
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160 | if ((to = (const char *)_iconv_resolve_encoding_name (rptr, to)) == NULL) |
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161 | return (iconv_t)-1; |
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162 | |
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163 | if ((from = (const char *)_iconv_resolve_encoding_name (rptr, from)) == NULL) |
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164 | { |
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165 | _free_r (rptr, (void *)to); |
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166 | return (iconv_t)-1; |
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167 | } |
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168 | |
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169 | ic = (iconv_conversion_t *)_malloc_r (rptr, sizeof (iconv_conversion_t)); |
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170 | if (ic == NULL) |
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171 | return (iconv_t)-1; |
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172 | |
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173 | /* Select which conversion type to use */ |
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174 | if (strcmp (from, to) == 0) |
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175 | { |
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176 | /* Use null conversion */ |
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177 | ic->handlers = &_iconv_null_conversion_handlers; |
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178 | ic->data = ic->handlers->open (rptr, to, from); |
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179 | } |
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180 | else |
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181 | { |
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182 | /* Use UCS-based conversion */ |
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183 | ic->handlers = &_iconv_ucs_conversion_handlers; |
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184 | ic->data = ic->handlers->open (rptr, to, from); |
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185 | } |
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186 | |
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187 | _free_r (rptr, (void *)to); |
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188 | _free_r (rptr, (void *)from); |
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189 | |
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190 | if (ic->data == NULL) |
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191 | { |
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192 | _free_r (rptr, (void *)ic); |
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193 | return (iconv_t)-1; |
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194 | } |
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195 | |
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196 | return (void *)ic; |
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197 | } |
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198 | |
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199 | |
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200 | size_t |
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201 | _iconv_r (struct _reent *rptr, |
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202 | iconv_t cd, |
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203 | const char **inbuf, |
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204 | size_t *inbytesleft, |
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205 | char **outbuf, |
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206 | size_t *outbytesleft) |
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207 | { |
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208 | iconv_conversion_t *ic = (iconv_conversion_t *)cd; |
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209 | |
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210 | if ((void *)cd == NULL || cd == (iconv_t)-1 || ic->data == NULL |
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211 | || (ic->handlers != &_iconv_null_conversion_handlers |
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212 | && ic->handlers != &_iconv_ucs_conversion_handlers)) |
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213 | { |
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214 | __errno_r (rptr) = EBADF; |
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215 | return (size_t)-1; |
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216 | } |
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217 | |
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218 | if (inbuf == NULL || *inbuf == NULL) |
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219 | { |
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220 | mbstate_t state_null = ICONV_ZERO_MB_STATE_T; |
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221 | |
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222 | if (!ic->handlers->is_stateful(ic->data, 1)) |
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223 | return (size_t)0; |
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224 | |
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225 | if (outbuf == NULL || *outbuf == NULL) |
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226 | { |
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227 | /* Reset shift state */ |
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228 | ic->handlers->set_state (ic->data, &state_null, 1); |
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229 | |
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230 | return (size_t)0; |
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231 | } |
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232 | |
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233 | if (outbytesleft != NULL) |
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234 | { |
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235 | mbstate_t state_save = ICONV_ZERO_MB_STATE_T; |
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236 | |
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237 | /* Save current shift state */ |
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238 | ic->handlers->get_state (ic->data, &state_save, 1); |
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239 | |
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240 | /* Reset shift state */ |
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241 | ic->handlers->set_state (ic->data, &state_null, 1); |
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242 | |
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243 | /* Get initial shift state sequence and it's length */ |
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244 | ic->handlers->get_state (ic->data, &state_null, 1); |
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245 | |
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246 | if (*outbytesleft >= state_null.__count) |
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247 | { |
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248 | memcpy ((void *)(*outbuf), (void *)&state_null, state_null.__count); |
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249 | |
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250 | *outbuf += state_null.__count; |
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251 | *outbytesleft -= state_null.__count; |
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252 | |
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253 | return (size_t)0; |
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254 | } |
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255 | |
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256 | /* Restore shift state if output buffer is too small */ |
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257 | ic->handlers->set_state (ic->data, &state_save, 1); |
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258 | } |
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259 | |
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260 | __errno_r (rptr) = E2BIG; |
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261 | return (size_t)-1; |
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262 | } |
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263 | |
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264 | if (*inbytesleft == 0) |
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265 | { |
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266 | __errno_r (rptr) = EINVAL; |
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267 | return (size_t)-1; |
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268 | } |
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269 | |
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270 | if (*outbytesleft == 0 || *outbuf == NULL) |
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271 | { |
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272 | __errno_r (rptr) = E2BIG; |
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273 | return (size_t)-1; |
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274 | } |
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275 | |
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276 | return ic->handlers->convert (rptr, |
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277 | ic->data, |
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278 | (const unsigned char**)inbuf, |
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279 | inbytesleft, |
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280 | (unsigned char**)outbuf, |
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281 | outbytesleft, |
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282 | 0); |
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283 | } |
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284 | |
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285 | |
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286 | int |
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287 | _iconv_close_r (struct _reent *rptr, |
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288 | iconv_t cd) |
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289 | { |
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290 | int res; |
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291 | iconv_conversion_t *ic = (iconv_conversion_t *)cd; |
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292 | |
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293 | if ((void *)cd == NULL || cd == (iconv_t)-1 || ic->data == NULL |
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294 | || (ic->handlers != &_iconv_null_conversion_handlers |
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295 | && ic->handlers != &_iconv_ucs_conversion_handlers)) |
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296 | { |
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297 | __errno_r (rptr) = EBADF; |
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298 | return -1; |
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299 | } |
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300 | |
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301 | res = (int)ic->handlers->close (rptr, ic->data); |
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302 | |
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303 | _free_r (rptr, (void *)cd); |
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304 | |
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305 | return res; |
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306 | } |
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307 | #endif /* !_REENT_ONLY */ |
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