1 | /*- |
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2 | * Copyright (c) 2002-2004 Tim J. Robbins. |
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3 | * 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 | <<fgetwc>>, <<getwc>>, <<fgetwc_unlocked>>, <<getwc_unlocked>>---get a wide character from a file or stream |
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30 | |
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31 | INDEX |
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32 | fgetwc |
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33 | INDEX |
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34 | fgetwc_unlocked |
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35 | INDEX |
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36 | _fgetwc_r |
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37 | INDEX |
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38 | _fgetwc_unlocked_r |
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39 | INDEX |
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40 | getwc |
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41 | INDEX |
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42 | getwc_unlocked |
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43 | INDEX |
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44 | _getwc_r |
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45 | INDEX |
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46 | _getwc_unlocked_r |
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47 | |
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48 | SYNOPSIS |
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49 | #include <stdio.h> |
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50 | #include <wchar.h> |
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51 | wint_t fgetwc(FILE *<[fp]>); |
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52 | |
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53 | #define _GNU_SOURCE |
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54 | #include <stdio.h> |
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55 | #include <wchar.h> |
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56 | wint_t fgetwc_unlocked(FILE *<[fp]>); |
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57 | |
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58 | #include <stdio.h> |
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59 | #include <wchar.h> |
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60 | wint_t _fgetwc_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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61 | |
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62 | #include <stdio.h> |
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63 | #include <wchar.h> |
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64 | wint_t _fgetwc_unlocked_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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65 | |
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66 | #include <stdio.h> |
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67 | #include <wchar.h> |
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68 | wint_t getwc(FILE *<[fp]>); |
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69 | |
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70 | #define _GNU_SOURCE |
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71 | #include <stdio.h> |
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72 | #include <wchar.h> |
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73 | wint_t getwc_unlocked(FILE *<[fp]>); |
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74 | |
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75 | #include <stdio.h> |
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76 | #include <wchar.h> |
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77 | wint_t _getwc_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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78 | |
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79 | #include <stdio.h> |
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80 | #include <wchar.h> |
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81 | wint_t _getwc_unlocked_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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82 | |
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83 | DESCRIPTION |
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84 | Use <<fgetwc>> to get the next wide character from the file or stream |
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85 | identified by <[fp]>. As a side effect, <<fgetwc>> advances the file's |
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86 | current position indicator. |
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87 | |
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88 | <<fgetwc_unlocked>> is a non-thread-safe version of <<fgetwc>>. |
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89 | <<fgetwc_unlocked>> may only safely be used within a scope |
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90 | protected by flockfile() (or ftrylockfile()) and funlockfile(). This |
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91 | function may safely be used in a multi-threaded program if and only |
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92 | if they are called while the invoking thread owns the (FILE *) |
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93 | object, as is the case after a successful call to the flockfile() or |
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94 | ftrylockfile() functions. If threads are disabled, then |
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95 | <<fgetwc_unlocked>> is equivalent to <<fgetwc>>. |
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96 | |
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97 | The <<getwc>> and <<getwc_unlocked>> functions or macros functions identically |
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98 | to <<fgetwc>> and <<fgetwc_unlocked>>. It may be implemented as a macro, and |
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99 | may evaluate its argument more than once. There is no reason ever to use it. |
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100 | |
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101 | <<_fgetwc_r>>, <<_getwc_r>>, <<_fgetwc_unlocked_r>>, and <<_getwc_unlocked_r>> |
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102 | are simply reentrant versions of the above functions that are passed the |
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103 | additional reentrant structure pointer argument: <[ptr]>. |
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104 | |
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105 | RETURNS |
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106 | The next wide character cast to <<wint_t>>, unless there is no more data, |
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107 | or the host system reports a read error; in either of these situations, |
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108 | <<fgetwc>> and <<getwc>> return <<WEOF>>. |
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109 | |
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110 | You can distinguish the two situations that cause an <<EOF>> result by |
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111 | using the <<ferror>> and <<feof>> functions. |
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112 | |
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113 | PORTABILITY |
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114 | <<fgetwc>> and <<getwc>> are required by C99 and POSIX.1-2001. |
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115 | |
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116 | <<fgetwc_unlocked>> and <<getwc_unlocked>> are GNU extensions. |
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117 | */ |
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118 | |
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119 | #include <_ansi.h> |
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120 | #include <reent.h> |
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121 | #include <errno.h> |
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122 | #include <stdio.h> |
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123 | #include <stdlib.h> |
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124 | #include <wchar.h> |
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125 | #include "local.h" |
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126 | |
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127 | wint_t |
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128 | __fgetwc (struct _reent *ptr, |
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129 | register FILE *fp) |
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130 | { |
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131 | wchar_t wc; |
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132 | size_t nconv; |
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133 | |
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134 | if (fp->_r <= 0 && __srefill_r (ptr, fp)) |
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135 | return (WEOF); |
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136 | if (MB_CUR_MAX == 1) |
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137 | { |
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138 | /* Fast path for single-byte encodings. */ |
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139 | wc = *fp->_p++; |
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140 | fp->_r--; |
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141 | return (wc); |
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142 | } |
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143 | do |
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144 | { |
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145 | nconv = _mbrtowc_r (ptr, &wc, (char *) fp->_p, fp->_r, &fp->_mbstate); |
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146 | if (nconv == (size_t)-1) |
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147 | break; |
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148 | else if (nconv == (size_t)-2) |
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149 | continue; |
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150 | else if (nconv == 0) |
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151 | { |
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152 | /* |
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153 | * Assume that the only valid representation of |
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154 | * the null wide character is a single null byte. |
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155 | */ |
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156 | fp->_p++; |
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157 | fp->_r--; |
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158 | return (L'\0'); |
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159 | } |
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160 | else |
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161 | { |
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162 | fp->_p += nconv; |
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163 | fp->_r -= nconv; |
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164 | return (wc); |
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165 | } |
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166 | } |
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167 | while (__srefill_r(ptr, fp) == 0); |
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168 | fp->_flags |= __SERR; |
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169 | errno = EILSEQ; |
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170 | return (WEOF); |
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171 | } |
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172 | |
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173 | wint_t |
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174 | _fgetwc_r (struct _reent *ptr, |
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175 | register FILE *fp) |
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176 | { |
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177 | wint_t r; |
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178 | |
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179 | _newlib_flockfile_start (fp); |
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180 | ORIENT(fp, 1); |
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181 | r = __fgetwc (ptr, fp); |
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182 | _newlib_flockfile_end (fp); |
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183 | return r; |
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184 | } |
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185 | |
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186 | wint_t |
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187 | fgetwc (FILE *fp) |
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188 | { |
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189 | struct _reent *reent = _REENT; |
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190 | |
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191 | CHECK_INIT(reent, fp); |
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192 | return _fgetwc_r (reent, fp); |
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193 | } |
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