1 | /*- |
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2 | * Copyright (c) 1990 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 | |
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18 | /* |
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19 | * Copyright (c) 2012-2014 ARM Ltd |
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20 | * All rights reserved. |
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21 | * |
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22 | * Redistribution and use in source and binary forms, with or without |
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23 | * modification, are permitted provided that the following conditions |
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24 | * are met: |
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25 | * 1. Redistributions of source code must retain the above copyright |
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26 | * notice, this list of conditions and the following disclaimer. |
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27 | * 2. Redistributions in binary form must reproduce the above copyright |
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28 | * notice, this list of conditions and the following disclaimer in the |
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29 | * documentation and/or other materials provided with the distribution. |
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30 | * 3. The name of the company may not be used to endorse or promote |
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31 | * products derived from this software without specific prior written |
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32 | * permission. |
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33 | * |
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34 | * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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35 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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36 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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37 | * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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38 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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39 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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40 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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41 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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42 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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43 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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44 | */ |
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45 | |
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46 | /* |
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47 | FUNCTION |
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48 | <<vfscanf>>, <<vscanf>>, <<vsscanf>>---format argument list |
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49 | |
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50 | INDEX |
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51 | vfscanf |
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52 | INDEX |
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53 | _vfscanf_r |
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54 | INDEX |
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55 | vscanf |
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56 | INDEX |
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57 | _vscanf_r |
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58 | INDEX |
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59 | vsscanf |
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60 | INDEX |
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61 | _vsscanf_r |
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62 | |
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63 | SYNOPSIS |
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64 | #include <stdio.h> |
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65 | #include <stdarg.h> |
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66 | int vscanf(const char *<[fmt]>, va_list <[list]>); |
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67 | int vfscanf(FILE *<[fp]>, const char *<[fmt]>, va_list <[list]>); |
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68 | int vsscanf(const char *<[str]>, const char *<[fmt]>, va_list <[list]>); |
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69 | |
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70 | int _vscanf_r(struct _reent *<[reent]>, const char *<[fmt]>, |
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71 | va_list <[list]>); |
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72 | int _vfscanf_r(struct _reent *<[reent]>, FILE *<[fp]>, const char *<[fmt]>, |
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73 | va_list <[list]>); |
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74 | int _vsscanf_r(struct _reent *<[reent]>, const char *<[str]>, |
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75 | const char *<[fmt]>, va_list <[list]>); |
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76 | |
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77 | DESCRIPTION |
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78 | <<vscanf>>, <<vfscanf>>, and <<vsscanf>> are (respectively) variants |
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79 | of <<scanf>>, <<fscanf>>, and <<sscanf>>. They differ only in |
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80 | allowing their caller to pass the variable argument list as a |
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81 | <<va_list>> object (initialized by <<va_start>>) rather than |
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82 | directly accepting a variable number of arguments. |
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83 | |
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84 | RETURNS |
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85 | The return values are consistent with the corresponding functions: |
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86 | <<vscanf>> returns the number of input fields successfully scanned, |
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87 | converted, and stored; the return value does not include scanned |
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88 | fields which were not stored. |
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89 | |
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90 | If <<vscanf>> attempts to read at end-of-file, the return value |
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91 | is <<EOF>>. |
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92 | |
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93 | If no fields were stored, the return value is <<0>>. |
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94 | |
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95 | The routines <<_vscanf_r>>, <<_vfscanf_f>>, and <<_vsscanf_r>> are |
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96 | reentrant versions which take an additional first parameter which points to the |
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97 | reentrancy structure. |
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98 | |
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99 | PORTABILITY |
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100 | These are GNU extensions. |
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101 | |
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102 | Supporting OS subroutines required: |
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103 | */ |
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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 <newlib.h> |
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108 | #include <ctype.h> |
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109 | #include <wctype.h> |
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110 | #include <stdio.h> |
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111 | #include <stdlib.h> |
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112 | #include <stdint.h> |
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113 | #include <limits.h> |
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114 | #include <wchar.h> |
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115 | #include <string.h> |
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116 | #include <stdarg.h> |
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117 | #include <errno.h> |
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118 | #include "local.h" |
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119 | #include "../stdlib/local.h" |
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120 | #include "nano-vfscanf_local.h" |
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121 | |
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122 | /* GCC PR 14577 at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14557 */ |
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123 | #if __STDC_VERSION__ >= 201112L |
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124 | #define va_ptr(ap) _Generic(&(ap), va_list *: &(ap), default: (va_list *)(ap)) |
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125 | #elif __GNUC__ >= 4 |
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126 | #define va_ptr(ap) __builtin_choose_expr(__builtin_types_compatible_p(__typeof__(&(ap)), va_list *), &(ap), (va_list *)(ap)) |
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127 | #else |
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128 | #define va_ptr(ap) (sizeof(ap) == sizeof(va_list) ? (va_list *)&(ap) : (va_list *)(ap)) |
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129 | #endif |
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130 | |
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131 | #define VFSCANF vfscanf |
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132 | #define _VFSCANF_R _vfscanf_r |
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133 | #define __SVFSCANF __svfscanf |
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134 | #ifdef STRING_ONLY |
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135 | # define __SVFSCANF_R __ssvfscanf_r |
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136 | #else |
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137 | # define __SVFSCANF_R __svfscanf_r |
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138 | #endif |
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139 | |
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140 | /* vfscanf. */ |
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141 | |
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142 | #ifndef STRING_ONLY |
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143 | |
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144 | #ifndef _REENT_ONLY |
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145 | |
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146 | int |
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147 | VFSCANF (register FILE *fp, |
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148 | const char *fmt, |
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149 | va_list ap) |
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150 | { |
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151 | CHECK_INIT(_REENT, fp); |
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152 | return __SVFSCANF_R (_REENT, fp, fmt, ap); |
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153 | } |
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154 | |
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155 | int |
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156 | vfiscanf (FILE *, const char *, __VALIST) |
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157 | _ATTRIBUTE ((__alias__("vfscanf"))); |
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158 | |
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159 | int |
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160 | __SVFSCANF (register FILE *fp, |
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161 | char const *fmt0, |
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162 | va_list ap) |
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163 | { |
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164 | return __SVFSCANF_R (_REENT, fp, fmt0, ap); |
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165 | } |
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166 | |
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167 | #endif |
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168 | |
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169 | int |
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170 | _VFSCANF_R (struct _reent *data, |
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171 | register FILE *fp, |
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172 | const char *fmt, |
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173 | va_list ap) |
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174 | { |
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175 | CHECK_INIT(data, fp); |
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176 | return __SVFSCANF_R (data, fp, fmt, ap); |
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177 | } |
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178 | |
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179 | int |
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180 | _vfiscanf_r (struct _reent *, FILE *, const char *, __VALIST) |
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181 | _ATTRIBUTE ((__alias__("_vfscanf_r"))); |
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182 | #endif /* !STRING_ONLY. */ |
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183 | |
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184 | #if defined (STRING_ONLY) |
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185 | /* When dealing with the sscanf family, we don't want to use the |
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186 | regular ungetc which will drag in file I/O items we don't need. |
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187 | So, we create our own trimmed-down version. */ |
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188 | int |
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189 | _sungetc_r (struct _reent *data, |
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190 | int c, |
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191 | register FILE *fp) |
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192 | { |
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193 | if (c == EOF) |
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194 | return (EOF); |
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195 | |
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196 | /* After ungetc, we won't be at eof anymore. */ |
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197 | fp->_flags &= ~__SEOF; |
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198 | c = (unsigned char) c; |
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199 | |
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200 | /* If we are in the middle of ungetc'ing, just continue. |
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201 | This may require expanding the current ungetc buffer. */ |
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202 | |
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203 | if (HASUB (fp)) |
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204 | { |
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205 | if (fp->_r >= fp->_ub._size && __submore (data, fp)) |
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206 | return EOF; |
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207 | |
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208 | *--fp->_p = c; |
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209 | fp->_r++; |
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210 | return c; |
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211 | } |
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212 | |
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213 | /* If we can handle this by simply backing up, do so, |
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214 | but never replace the original character. |
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215 | (This makes sscanf() work when scanning `const' data). */ |
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216 | if (fp->_bf._base != NULL && fp->_p > fp->_bf._base && fp->_p[-1] == c) |
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217 | { |
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218 | fp->_p--; |
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219 | fp->_r++; |
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220 | return c; |
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221 | } |
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222 | |
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223 | /* Create an ungetc buffer. |
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224 | Initially, we will use the `reserve' buffer. */ |
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225 | fp->_ur = fp->_r; |
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226 | fp->_up = fp->_p; |
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227 | fp->_ub._base = fp->_ubuf; |
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228 | fp->_ub._size = sizeof (fp->_ubuf); |
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229 | fp->_ubuf[sizeof (fp->_ubuf) - 1] = c; |
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230 | fp->_p = &fp->_ubuf[sizeof (fp->_ubuf) - 1]; |
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231 | fp->_r = 1; |
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232 | return c; |
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233 | } |
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234 | |
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235 | /* String only version of __srefill_r for sscanf family. */ |
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236 | int |
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237 | __ssrefill_r (struct _reent * ptr, |
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238 | register FILE * fp) |
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239 | { |
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240 | /* Our only hope of further input is the ungetc buffer. |
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241 | If there is anything in that buffer to read, return. */ |
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242 | if (HASUB (fp)) |
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243 | { |
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244 | FREEUB (ptr, fp); |
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245 | if ((fp->_r = fp->_ur) != 0) |
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246 | { |
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247 | fp->_p = fp->_up; |
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248 | return 0; |
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249 | } |
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250 | } |
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251 | |
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252 | /* Otherwise we are out of character input. */ |
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253 | fp->_p = fp->_bf._base; |
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254 | fp->_r = 0; |
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255 | fp->_flags |= __SEOF; |
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256 | return EOF; |
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257 | } |
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258 | |
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259 | #else |
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260 | int _sungetc_r (struct _reent *, int, register FILE *); |
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261 | int __ssrefill_r (struct _reent *, register FILE *); |
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262 | size_t _sfread_r (struct _reent *, void *buf, size_t, size_t, FILE *); |
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263 | #endif /* !STRING_ONLY. */ |
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264 | |
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265 | int |
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266 | __SVFSCANF_R (struct _reent *rptr, |
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267 | register FILE *fp, |
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268 | char const *fmt0, |
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269 | va_list ap) |
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270 | { |
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271 | register u_char *fmt = (u_char *) fmt0; |
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272 | register int c; /* Character from format, or conversion. */ |
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273 | register char *p; /* Points into all kinds of strings. */ |
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274 | char ccltab[256]; /* Character class table for %[...]. */ |
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275 | |
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276 | int ret; |
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277 | char *cp; |
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278 | |
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279 | struct _scan_data_t scan_data; |
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280 | int (*scan_func)(struct _reent*, struct _scan_data_t*, FILE *, va_list *); |
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281 | |
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282 | _newlib_flockfile_start (fp); |
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283 | |
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284 | scan_data.nassigned = 0; |
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285 | scan_data.nread = 0; |
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286 | scan_data.ccltab = ccltab; |
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287 | scan_data.pfn_ungetc = _ungetc_r; |
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288 | scan_data.pfn_refill = __srefill_r; |
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289 | |
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290 | for (;;) |
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291 | { |
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292 | if (*fmt == 0) |
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293 | goto all_done; |
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294 | |
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295 | if (isspace (*fmt)) |
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296 | { |
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297 | while ((fp->_r > 0 || !scan_data.pfn_refill(rptr, fp)) |
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298 | && isspace (*fp->_p)) |
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299 | { |
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300 | scan_data.nread++; |
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301 | fp->_r--; |
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302 | fp->_p++; |
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303 | } |
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304 | fmt++; |
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305 | continue; |
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306 | } |
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307 | if ((c = *fmt++) != '%') |
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308 | goto literal; |
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309 | |
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310 | scan_data.width = 0; |
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311 | scan_data.flags = 0; |
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312 | |
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313 | if (*fmt == '*') |
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314 | { |
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315 | scan_data.flags |= SUPPRESS; |
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316 | fmt++; |
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317 | } |
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318 | |
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319 | for (; is_digit (*fmt); fmt++) |
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320 | scan_data.width = 10 * scan_data.width + to_digit (*fmt); |
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321 | |
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322 | /* The length modifiers. */ |
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323 | p = "hlL"; |
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324 | if ((cp = memchr (p, *fmt, 3)) != NULL) { |
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325 | scan_data.flags |= (SHORT << (cp - p)); |
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326 | fmt++; |
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327 | } |
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328 | |
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329 | /* Switch on the format. continue if done; break once format |
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330 | type is derived. */ |
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331 | c = *fmt++; |
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332 | switch (c) |
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333 | { |
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334 | case '%': |
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335 | literal: |
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336 | if ((fp->_r <= 0 && scan_data.pfn_refill(rptr, fp))) |
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337 | goto input_failure; |
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338 | if (*fp->_p != c) |
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339 | goto match_failure; |
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340 | fp->_r--, fp->_p++; |
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341 | scan_data.nread++; |
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342 | continue; |
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343 | |
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344 | case 'p': |
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345 | scan_data.flags |= POINTER; |
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346 | case 'x': |
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347 | case 'X': |
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348 | scan_data.flags |= PFXOK; |
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349 | scan_data.base = 16; |
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350 | goto number; |
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351 | case 'd': |
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352 | case 'u': |
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353 | scan_data.base = 10; |
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354 | goto number; |
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355 | case 'i': |
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356 | scan_data.base = 0; |
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357 | goto number; |
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358 | case 'o': |
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359 | scan_data.base = 8; |
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360 | number: |
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361 | scan_data.code = (c < 'o') ? CT_INT : CT_UINT; |
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362 | break; |
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363 | |
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364 | case '[': |
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365 | fmt = (u_char *) __sccl (ccltab, (unsigned char *) fmt); |
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366 | scan_data.flags |= NOSKIP; |
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367 | scan_data.code = CT_CCL; |
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368 | break; |
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369 | case 'c': |
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370 | scan_data.flags |= NOSKIP; |
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371 | scan_data.code = CT_CHAR; |
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372 | break; |
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373 | case 's': |
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374 | scan_data.code = CT_STRING; |
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375 | break; |
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376 | |
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377 | case 'n': |
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378 | if (scan_data.flags & SUPPRESS) /* ??? */ |
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379 | continue; |
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380 | |
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381 | if (scan_data.flags & SHORT) |
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382 | *GET_ARG (N, ap, short *) = scan_data.nread; |
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383 | else if (scan_data.flags & LONG) |
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384 | *GET_ARG (N, ap, long *) = scan_data.nread; |
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385 | else |
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386 | *GET_ARG (N, ap, int *) = scan_data.nread; |
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387 | |
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388 | continue; |
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389 | |
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390 | /* Disgusting backwards compatibility hacks. XXX. */ |
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391 | case '\0': /* compat. */ |
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392 | _newlib_flockfile_exit (fp); |
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393 | return EOF; |
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394 | |
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395 | #ifdef FLOATING_POINT |
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396 | case 'e': case 'E': |
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397 | case 'f': case 'F': |
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398 | case 'g': case 'G': |
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399 | scan_data.code = CT_FLOAT; |
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400 | break; |
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401 | #endif |
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402 | default: /* compat. */ |
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403 | scan_data.code = CT_INT; |
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404 | scan_data.base = 10; |
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405 | break; |
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406 | } |
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407 | |
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408 | /* We have a conversion that requires input. */ |
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409 | if ((fp->_r <= 0 && scan_data.pfn_refill (rptr, fp))) |
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410 | goto input_failure; |
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411 | |
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412 | /* Consume leading white space, except for formats that |
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413 | suppress this. */ |
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414 | if ((scan_data.flags & NOSKIP) == 0) |
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415 | { |
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416 | while (isspace (*fp->_p)) |
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417 | { |
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418 | scan_data.nread++; |
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419 | if (--fp->_r > 0) |
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420 | fp->_p++; |
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421 | else if (scan_data.pfn_refill (rptr, fp)) |
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422 | goto input_failure; |
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423 | } |
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424 | /* Note that there is at least one character in the |
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425 | buffer, so conversions that do not set NOSKIP ca |
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426 | no longer result in an input failure. */ |
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427 | } |
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428 | ret = 0; |
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429 | if (scan_data.code < CT_INT) |
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430 | ret = _scanf_chars (rptr, &scan_data, fp, va_ptr(ap)); |
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431 | else if (scan_data.code < CT_FLOAT) |
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432 | ret = _scanf_i (rptr, &scan_data, fp, va_ptr(ap)); |
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433 | #ifdef FLOATING_POINT |
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434 | else if (_scanf_float) |
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435 | ret = _scanf_float (rptr, &scan_data, fp, va_ptr(ap)); |
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436 | #endif |
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437 | |
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438 | if (ret == MATCH_FAILURE) |
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439 | goto match_failure; |
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440 | else if (ret == INPUT_FAILURE) |
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441 | goto input_failure; |
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442 | } |
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443 | input_failure: |
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444 | /* On read failure, return EOF failure regardless of matches; errno |
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445 | should have been set prior to here. On EOF failure (including |
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446 | invalid format string), return EOF if no matches yet, else number |
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447 | of matches made prior to failure. */ |
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448 | _newlib_flockfile_exit (fp); |
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449 | return scan_data.nassigned && !(fp->_flags & __SERR) ? scan_data.nassigned |
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450 | : EOF; |
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451 | match_failure: |
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452 | all_done: |
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453 | /* Return number of matches, which can be 0 on match failure. */ |
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454 | _newlib_flockfile_end (fp); |
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455 | return scan_data.nassigned; |
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456 | } |
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457 | |
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458 | #ifdef STRING_ONLY |
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459 | int |
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460 | __ssvfiscanf_r (struct _reent *, FILE *, const char *, __VALIST) |
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461 | _ATTRIBUTE ((__alias__("__ssvfscanf_r"))); |
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462 | #else |
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463 | int |
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464 | __svfiscanf_r (struct _reent *, FILE *, const char *, __VALIST) |
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465 | _ATTRIBUTE ((__alias__("__svfscanf_r"))); |
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466 | #endif |
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467 | |
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