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4349 | Serge | 1 | /* |
2 | * Copyright (c) 1990, 2007 The Regents of the University of California. |
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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 are permitted |
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6 | * provided that the above copyright notice and this paragraph are |
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7 | * duplicated in all such forms and that any documentation, |
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8 | * advertising materials, and other materials related to such |
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9 | * distribution and use acknowledge that the software was developed |
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10 | * by the University of California, Berkeley. The name of the |
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11 | * University may not be used to endorse or promote products derived |
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12 | * from this software without specific prior written permission. |
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13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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16 | */ |
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17 | |||
18 | /* |
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19 | FUNCTION |
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6099 | serge | 20 | < |
4349 | Serge | 21 | |
22 | INDEX |
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23 | fread |
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24 | INDEX |
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6099 | serge | 25 | fread_unlocked |
26 | INDEX |
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4349 | Serge | 27 | _fread_r |
6099 | serge | 28 | INDEX |
29 | _fread_unlocked_r |
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4349 | Serge | 30 | |
31 | ANSI_SYNOPSIS |
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32 | #include |
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4921 | Serge | 33 | size_t fread(void *restrict <[buf]>, size_t <[size]>, size_t <[count]>, |
34 | FILE *restrict <[fp]>); |
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4349 | Serge | 35 | |
6099 | serge | 36 | #define _BSD_SOURCE |
4349 | Serge | 37 | #include |
6099 | serge | 38 | size_t fread_unlocked(void *restrict <[buf]>, size_t <[size]>, size_t <[count]>, |
39 | FILE *restrict <[fp]>); |
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40 | |||
41 | #include |
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4921 | Serge | 42 | size_t _fread_r(struct _reent *<[ptr]>, void *restrict <[buf]>, |
43 | size_t <[size]>, size_t <[count]>, FILE *restrict <[fp]>); |
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4349 | Serge | 44 | |
6099 | serge | 45 | #include |
46 | size_t _fread_unlocked_r(struct _reent *<[ptr]>, void *restrict <[buf]>, |
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47 | size_t <[size]>, size_t <[count]>, FILE *restrict <[fp]>); |
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48 | |||
4349 | Serge | 49 | TRAD_SYNOPSIS |
50 | #include |
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51 | size_t fread(<[buf]>, <[size]>, <[count]>, <[fp]>) |
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52 | char *<[buf]>; |
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53 | size_t <[size]>; |
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54 | size_t <[count]>; |
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55 | FILE *<[fp]>; |
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56 | |||
6099 | serge | 57 | #define _BSD_SOURCE |
4349 | Serge | 58 | #include |
6099 | serge | 59 | size_t fread_unlocked(<[buf]>, <[size]>, <[count]>, <[fp]>) |
60 | char *<[buf]>; |
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61 | size_t <[size]>; |
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62 | size_t <[count]>; |
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63 | FILE *<[fp]>; |
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64 | |||
65 | #include |
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4349 | Serge | 66 | size_t _fread_r(<[ptr]>, <[buf]>, <[size]>, <[count]>, <[fp]>) |
67 | struct _reent *<[ptr]>; |
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68 | char *<[buf]>; |
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69 | size_t <[size]>; |
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70 | size_t <[count]>; |
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71 | FILE *<[fp]>; |
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72 | |||
6099 | serge | 73 | #include |
74 | size_t _fread_unlocked_r(<[ptr]>, <[buf]>, <[size]>, <[count]>, <[fp]>) |
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75 | struct _reent *<[ptr]>; |
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76 | char *<[buf]>; |
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77 | size_t <[size]>; |
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78 | size_t <[count]>; |
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79 | FILE *<[fp]>; |
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80 | |||
4349 | Serge | 81 | DESCRIPTION |
82 | < |
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83 | <[fp]>, <[count]> elements (each of size <[size]>) into memory, |
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84 | starting at <[buf]>. < |
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85 | <[count]> if an error, or end of file, intervenes. |
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86 | |||
87 | < |
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88 | <[fp]> by the number of @emph{characters} actually read. |
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89 | |||
6099 | serge | 90 | < |
91 | < |
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92 | protected by flockfile() (or ftrylockfile()) and funlockfile(). This |
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93 | function may safely be used in a multi-threaded program if and only |
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94 | if they are called while the invoking thread owns the (FILE *) |
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95 | object, as is the case after a successful call to the flockfile() or |
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96 | ftrylockfile() functions. If threads are disabled, then |
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97 | < |
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4349 | Serge | 98 | |
6099 | serge | 99 | <<_fread_r>> and <<_fread_unlocked_r>> are simply reentrant versions of the |
100 | above that take an additional reentrant structure pointer argument: <[ptr]>. |
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101 | |||
4349 | Serge | 102 | RETURNS |
103 | The result of < |
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104 | reading. |
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105 | |||
106 | PORTABILITY |
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107 | ANSI C requires < |
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108 | |||
6099 | serge | 109 | < |
110 | |||
4349 | Serge | 111 | Supporting OS subroutines required: < |
112 | < |
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113 | */ |
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114 | |||
115 | #include <_ansi.h> |
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116 | #include |
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117 | #include |
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118 | #include |
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119 | #include "local.h" |
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120 | |||
6099 | serge | 121 | #ifdef __IMPL_UNLOCKED__ |
122 | #define _fread_r _fread_unlocked_r |
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123 | #define fread fread_unlocked |
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124 | #endif |
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125 | |||
4349 | Serge | 126 | #ifdef __SCLE |
127 | static size_t |
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128 | _DEFUN(crlf_r, (ptr, fp, buf, count, eof), |
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129 | struct _reent * ptr _AND |
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130 | FILE * fp _AND |
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131 | char * buf _AND |
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132 | size_t count _AND |
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133 | int eof) |
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134 | { |
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135 | int r; |
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136 | char *s, *d, *e; |
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137 | |||
138 | if (count == 0) |
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139 | return 0; |
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140 | |||
141 | e = buf + count; |
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142 | for (s=d=buf; s |
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143 | { |
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144 | if (*s == '\r' && s[1] == '\n') |
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145 | s++; |
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146 | *d++ = *s; |
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147 | } |
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148 | if (s < e) |
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149 | { |
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150 | if (*s == '\r') |
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151 | { |
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152 | int c = __sgetc_raw_r (ptr, fp); |
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153 | if (c == '\n') |
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154 | *s = '\n'; |
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155 | else |
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156 | ungetc (c, fp); |
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157 | } |
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158 | *d++ = *s++; |
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159 | } |
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160 | |||
161 | |||
162 | while (d < e) |
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163 | { |
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164 | r = _getc_r (ptr, fp); |
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165 | if (r == EOF) |
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166 | return count - (e-d); |
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167 | *d++ = r; |
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168 | } |
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169 | |||
170 | return count; |
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171 | |||
172 | } |
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173 | |||
174 | #endif |
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175 | |||
176 | size_t |
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177 | _DEFUN(_fread_r, (ptr, buf, size, count, fp), |
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178 | struct _reent * ptr _AND |
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4921 | Serge | 179 | _PTR __restrict buf _AND |
4349 | Serge | 180 | size_t size _AND |
181 | size_t count _AND |
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4921 | Serge | 182 | FILE * __restrict fp) |
4349 | Serge | 183 | { |
184 | register size_t resid; |
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185 | register char *p; |
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186 | register int r; |
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187 | size_t total; |
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188 | |||
189 | if ((resid = count * size) == 0) |
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190 | return 0; |
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191 | |||
192 | CHECK_INIT(ptr, fp); |
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193 | |||
4921 | Serge | 194 | _newlib_flockfile_start (fp); |
4349 | Serge | 195 | ORIENT (fp, -1); |
196 | if (fp->_r < 0) |
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197 | fp->_r = 0; |
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198 | total = resid; |
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199 | p = buf; |
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200 | |||
201 | #if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__) |
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202 | |||
203 | /* Optimize unbuffered I/O. */ |
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204 | if (fp->_flags & __SNBF) |
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205 | { |
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206 | /* First copy any available characters from ungetc buffer. */ |
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207 | int copy_size = resid > fp->_r ? fp->_r : resid; |
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208 | _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, (size_t) copy_size); |
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209 | fp->_p += copy_size; |
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210 | fp->_r -= copy_size; |
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211 | p += copy_size; |
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212 | resid -= copy_size; |
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213 | |||
214 | /* If still more data needed, free any allocated ungetc buffer. */ |
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215 | if (HASUB (fp) && resid > 0) |
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216 | FREEUB (ptr, fp); |
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217 | |||
218 | /* Finally read directly into user's buffer if needed. */ |
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219 | while (resid > 0) |
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220 | { |
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221 | int rc = 0; |
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222 | /* save fp buffering state */ |
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223 | void *old_base = fp->_bf._base; |
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224 | void * old_p = fp->_p; |
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225 | int old_size = fp->_bf._size; |
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226 | /* allow __refill to use user's buffer */ |
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227 | fp->_bf._base = (unsigned char *) p; |
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228 | fp->_bf._size = resid; |
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229 | fp->_p = (unsigned char *) p; |
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230 | rc = __srefill_r (ptr, fp); |
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231 | /* restore fp buffering back to original state */ |
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232 | fp->_bf._base = old_base; |
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233 | fp->_bf._size = old_size; |
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234 | fp->_p = old_p; |
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235 | resid -= fp->_r; |
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236 | p += fp->_r; |
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237 | fp->_r = 0; |
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238 | if (rc) |
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239 | { |
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240 | #ifdef __SCLE |
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241 | if (fp->_flags & __SCLE) |
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242 | { |
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4921 | Serge | 243 | _newlib_flockfile_exit (fp); |
4349 | Serge | 244 | return crlf_r (ptr, fp, buf, total-resid, 1) / size; |
245 | } |
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246 | #endif |
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4921 | Serge | 247 | _newlib_flockfile_exit (fp); |
4349 | Serge | 248 | return (total - resid) / size; |
249 | } |
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250 | } |
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251 | } |
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252 | else |
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253 | #endif /* !PREFER_SIZE_OVER_SPEED && !__OPTIMIZE_SIZE__ */ |
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254 | { |
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255 | while (resid > (r = fp->_r)) |
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256 | { |
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257 | _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, (size_t) r); |
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258 | fp->_p += r; |
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259 | /* fp->_r = 0 ... done in __srefill */ |
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260 | p += r; |
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261 | resid -= r; |
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262 | if (__srefill_r (ptr, fp)) |
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263 | { |
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264 | /* no more input: return partial result */ |
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265 | #ifdef __SCLE |
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266 | if (fp->_flags & __SCLE) |
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267 | { |
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4921 | Serge | 268 | _newlib_flockfile_exit (fp); |
4349 | Serge | 269 | return crlf_r (ptr, fp, buf, total-resid, 1) / size; |
270 | } |
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271 | #endif |
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4921 | Serge | 272 | _newlib_flockfile_exit (fp); |
4349 | Serge | 273 | return (total - resid) / size; |
274 | } |
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275 | } |
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276 | _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, resid); |
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277 | fp->_r -= resid; |
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278 | fp->_p += resid; |
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279 | } |
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280 | |||
281 | /* Perform any CR/LF clean-up if necessary. */ |
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282 | #ifdef __SCLE |
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283 | if (fp->_flags & __SCLE) |
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284 | { |
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4921 | Serge | 285 | _newlib_flockfile_exit (fp); |
4349 | Serge | 286 | return crlf_r(ptr, fp, buf, total, 0) / size; |
287 | } |
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288 | #endif |
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4921 | Serge | 289 | _newlib_flockfile_end (fp); |
4349 | Serge | 290 | return count; |
291 | } |
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292 | |||
293 | #ifndef _REENT_ONLY |
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294 | size_t |
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295 | _DEFUN(fread, (buf, size, count, fp), |
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4921 | Serge | 296 | _PTR __restrict buf _AND |
4349 | Serge | 297 | size_t size _AND |
298 | size_t count _AND |
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4921 | Serge | 299 | FILE *__restrict fp) |
4349 | Serge | 300 | { |
301 | return _fread_r (_REENT, buf, size, count, fp); |
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302 | } |
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303 | #endif>>> |