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 | #include <_ansi.h> |
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19 | #include <reent.h> |
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20 | #include <newlib.h> |
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21 | #include <ctype.h> |
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22 | #include <wctype.h> |
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23 | #include <stdio.h> |
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24 | #include <stdlib.h> |
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25 | #include <stdint.h> |
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26 | #include <limits.h> |
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27 | #include <wchar.h> |
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28 | #include <string.h> |
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29 | #include <stdarg.h> |
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30 | #include <errno.h> |
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31 | #include "local.h" |
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32 | #include "../stdlib/local.h" |
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33 | #include "nano-vfscanf_local.h" |
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34 | |
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35 | #ifdef FLOATING_POINT |
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36 | int |
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37 | _scanf_float (struct _reent *rptr, |
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38 | struct _scan_data_t *pdata, |
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39 | FILE *fp, va_list *ap) |
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40 | { |
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41 | int c; |
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42 | char *p; |
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43 | float *flp; |
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44 | _LONG_DOUBLE *ldp; |
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45 | |
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46 | /* Scan a floating point number as if by strtod. */ |
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47 | /* This code used to assume that the number of digits is reasonable. |
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48 | However, ANSI / ISO C makes no such stipulation; we have to get |
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49 | exact results even when there is an unreasonable amount of leading |
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50 | zeroes. */ |
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51 | long leading_zeroes = 0; |
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52 | long zeroes, exp_adjust; |
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53 | char *exp_start = NULL; |
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54 | unsigned width_left = 0; |
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55 | char nancount = 0; |
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56 | char infcount = 0; |
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57 | #ifdef hardway |
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58 | if (pdata->width == 0 || pdata->width > BUF - 1) |
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59 | #else |
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60 | /* size_t is unsigned, hence this optimisation. */ |
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61 | if (pdata->width - 1 > BUF - 2) |
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62 | #endif |
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63 | { |
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64 | width_left = pdata->width - (BUF - 1); |
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65 | pdata->width = BUF - 1; |
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66 | } |
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67 | pdata->flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; |
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68 | zeroes = 0; |
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69 | exp_adjust = 0; |
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70 | for (p = pdata->buf; pdata->width; ) |
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71 | { |
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72 | c = *fp->_p; |
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73 | /* This code mimicks the integer conversion code, |
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74 | but is much simpler. */ |
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75 | switch (c) |
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76 | { |
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77 | case '0': |
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78 | if (pdata->flags & NDIGITS) |
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79 | { |
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80 | pdata->flags &= ~SIGNOK; |
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81 | zeroes++; |
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82 | if (width_left) |
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83 | { |
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84 | width_left--; |
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85 | pdata->width++; |
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86 | } |
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87 | goto fskip; |
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88 | } |
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89 | /* Fall through. */ |
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90 | case '1': |
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91 | case '2': |
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92 | case '3': |
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93 | case '4': |
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94 | case '5': |
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95 | case '6': |
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96 | case '7': |
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97 | case '8': |
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98 | case '9': |
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99 | if (nancount + infcount == 0) |
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100 | { |
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101 | pdata->flags &= ~(SIGNOK | NDIGITS); |
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102 | goto fok; |
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103 | } |
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104 | break; |
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105 | |
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106 | case '+': |
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107 | case '-': |
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108 | if (pdata->flags & SIGNOK) |
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109 | { |
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110 | pdata->flags &= ~SIGNOK; |
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111 | goto fok; |
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112 | } |
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113 | break; |
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114 | case 'n': |
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115 | case 'N': |
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116 | if (nancount == 0 && zeroes == 0 |
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117 | && (pdata->flags & (NDIGITS | DPTOK | EXPOK)) == |
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118 | (NDIGITS | DPTOK | EXPOK)) |
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119 | { |
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120 | pdata->flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS); |
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121 | nancount = 1; |
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122 | goto fok; |
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123 | } |
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124 | if (nancount == 2) |
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125 | { |
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126 | nancount = 3; |
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127 | goto fok; |
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128 | } |
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129 | if (infcount == 1 || infcount == 4) |
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130 | { |
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131 | infcount++; |
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132 | goto fok; |
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133 | } |
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134 | break; |
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135 | case 'a': |
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136 | case 'A': |
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137 | if (nancount == 1) |
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138 | { |
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139 | nancount = 2; |
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140 | goto fok; |
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141 | } |
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142 | break; |
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143 | case 'i': |
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144 | case 'I': |
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145 | if (infcount == 0 && zeroes == 0 |
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146 | && (pdata->flags & (NDIGITS | DPTOK | EXPOK)) == |
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147 | (NDIGITS | DPTOK | EXPOK)) |
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148 | { |
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149 | pdata->flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS); |
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150 | infcount = 1; |
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151 | goto fok; |
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152 | } |
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153 | if (infcount == 3 || infcount == 5) |
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154 | { |
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155 | infcount++; |
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156 | goto fok; |
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157 | } |
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158 | break; |
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159 | case 'f': |
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160 | case 'F': |
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161 | if (infcount == 2) |
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162 | { |
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163 | infcount = 3; |
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164 | goto fok; |
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165 | } |
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166 | break; |
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167 | case 't': |
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168 | case 'T': |
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169 | if (infcount == 6) |
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170 | { |
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171 | infcount = 7; |
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172 | goto fok; |
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173 | } |
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174 | break; |
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175 | case 'y': |
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176 | case 'Y': |
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177 | if (infcount == 7) |
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178 | { |
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179 | infcount = 8; |
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180 | goto fok; |
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181 | } |
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182 | break; |
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183 | case '.': |
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184 | if (pdata->flags & DPTOK) |
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185 | { |
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186 | pdata->flags &= ~(SIGNOK | DPTOK); |
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187 | leading_zeroes = zeroes; |
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188 | goto fok; |
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189 | } |
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190 | break; |
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191 | case 'e': |
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192 | case 'E': |
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193 | /* No exponent without some digits. */ |
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194 | if ((pdata->flags & (NDIGITS | EXPOK)) == EXPOK |
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195 | || ((pdata->flags & EXPOK) && zeroes)) |
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196 | { |
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197 | if (! (pdata->flags & DPTOK)) |
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198 | { |
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199 | exp_adjust = zeroes - leading_zeroes; |
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200 | exp_start = p; |
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201 | } |
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202 | pdata->flags = |
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203 | (pdata->flags & ~(EXPOK | DPTOK)) | SIGNOK | NDIGITS; |
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204 | zeroes = 0; |
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205 | goto fok; |
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206 | } |
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207 | break; |
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208 | } |
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209 | break; |
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210 | fok: |
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211 | *p++ = c; |
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212 | fskip: |
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213 | pdata->width--; |
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214 | ++pdata->nread; |
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215 | if (--fp->_r > 0) |
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216 | fp->_p++; |
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217 | else if (pdata->pfn_refill (rptr, fp)) |
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218 | /* "EOF". */ |
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219 | break; |
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220 | } |
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221 | if (zeroes) |
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222 | pdata->flags &= ~NDIGITS; |
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223 | /* We may have a 'N' or possibly even [sign] 'N' 'a' as the |
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224 | start of 'NaN', only to run out of chars before it was |
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225 | complete (or having encountered a non-matching char). So |
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226 | check here if we have an outstanding nancount, and if so |
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227 | put back the chars we did swallow and treat as a failed |
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228 | match. |
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229 | |
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230 | FIXME - we still don't handle NAN([0xdigits]). */ |
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231 | if (nancount - 1U < 2U) |
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232 | { |
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233 | /* "nancount && nancount < 3". */ |
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234 | /* Newlib's ungetc works even if we called __srefill in |
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235 | the middle of a partial parse, but POSIX does not |
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236 | guarantee that in all implementations of ungetc. */ |
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237 | while (p > pdata->buf) |
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238 | { |
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239 | pdata->pfn_ungetc (rptr, *--p, fp); /* "[-+nNaA]". */ |
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240 | --pdata->nread; |
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241 | } |
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242 | return MATCH_FAILURE; |
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243 | } |
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244 | /* Likewise for 'inf' and 'infinity'. But be careful that |
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245 | 'infinite' consumes only 3 characters, leaving the stream |
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246 | at the second 'i'. */ |
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247 | if (infcount - 1U < 7U) |
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248 | { |
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249 | /* "infcount && infcount < 8". */ |
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250 | if (infcount >= 3) /* valid 'inf', but short of 'infinity'. */ |
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251 | while (infcount-- > 3) |
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252 | { |
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253 | pdata->pfn_ungetc (rptr, *--p, fp); /* "[iInNtT]". */ |
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254 | --pdata->nread; |
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255 | } |
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256 | else |
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257 | { |
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258 | while (p > pdata->buf) |
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259 | { |
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260 | pdata->pfn_ungetc (rptr, *--p, fp); /* "[-+iInN]". */ |
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261 | --pdata->nread; |
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262 | } |
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263 | return MATCH_FAILURE; |
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264 | } |
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265 | } |
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266 | /* If no digits, might be missing exponent digits |
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267 | (just give back the exponent) or might be missing |
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268 | regular digits, but had sign and/or decimal point. */ |
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269 | if (pdata->flags & NDIGITS) |
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270 | { |
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271 | if (pdata->flags & EXPOK) |
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272 | { |
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273 | /* No digits at all. */ |
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274 | while (p > pdata->buf) |
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275 | { |
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276 | pdata->pfn_ungetc (rptr, *--p, fp); /* "[-+.]". */ |
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277 | --pdata->nread; |
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278 | } |
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279 | return MATCH_FAILURE; |
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280 | } |
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281 | /* Just a bad exponent (e and maybe sign). */ |
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282 | c = *--p; |
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283 | --pdata->nread; |
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284 | if (c != 'e' && c != 'E') |
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285 | { |
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286 | pdata->pfn_ungetc (rptr, c, fp); /* "[-+]". */ |
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287 | c = *--p; |
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288 | --pdata->nread; |
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289 | } |
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290 | pdata->pfn_ungetc (rptr, c, fp); /* "[eE]". */ |
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291 | } |
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292 | if ((pdata->flags & SUPPRESS) == 0) |
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293 | { |
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294 | double fp; |
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295 | long new_exp = 0; |
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296 | |
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297 | *p = 0; |
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298 | if ((pdata->flags & (DPTOK | EXPOK)) == EXPOK) |
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299 | { |
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300 | exp_adjust = zeroes - leading_zeroes; |
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301 | new_exp = -exp_adjust; |
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302 | exp_start = p; |
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303 | } |
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304 | else if (exp_adjust) |
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305 | new_exp = _strtol_r (rptr, (exp_start + 1), NULL, 10) - exp_adjust; |
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306 | |
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307 | if (exp_adjust) |
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308 | { |
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309 | /* If there might not be enough space for the new exponent, |
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310 | truncate some trailing digits to make room. */ |
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311 | if (exp_start >= pdata->buf + BUF - MAX_LONG_LEN) |
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312 | exp_start = pdata->buf + BUF - MAX_LONG_LEN - 1; |
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313 | sprintf (exp_start, "e%ld", new_exp); |
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314 | } |
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315 | |
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316 | /* Current _strtold routine is markedly slower than |
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317 | _strtod_r. Only use it if we have a long double |
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318 | result. */ |
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319 | fp = _strtod_r (rptr, pdata->buf, NULL); |
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320 | |
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321 | /* Do not support long double. */ |
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322 | if (pdata->flags & LONG) |
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323 | *GET_ARG (N, *ap, double *) = fp; |
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324 | else if (pdata->flags & LONGDBL) |
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325 | { |
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326 | ldp = GET_ARG (N, *ap, _LONG_DOUBLE *); |
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327 | *ldp = fp; |
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328 | } |
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329 | else |
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330 | { |
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331 | flp = GET_ARG (N, *ap, float *); |
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332 | if (isnan (fp)) |
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333 | *flp = nanf (NULL); |
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334 | else |
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335 | *flp = fp; |
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336 | } |
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337 | pdata->nassigned++; |
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338 | } |
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339 | return 0; |
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340 | } |
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341 | #endif |
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342 | |
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