1 | /* |
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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 | |
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18 | /* |
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19 | FUNCTION |
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20 | <<swprintf>>, <<fwprintf>>, <<wprintf>>---wide character format output |
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21 | |
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22 | INDEX |
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23 | fwprintf |
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24 | INDEX |
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25 | _fwprintf_r |
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26 | INDEX |
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27 | wprintf |
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28 | INDEX |
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29 | _wprintf_r |
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30 | INDEX |
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31 | swprintf |
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32 | INDEX |
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33 | _swprintf_r |
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34 | |
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35 | SYNOPSIS |
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36 | #include <wchar.h> |
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37 | |
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38 | int wprintf(const wchar_t *<[format]>, ...); |
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39 | int fwprintf(FILE *__restrict <[fd]>, |
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40 | const wchar_t *__restrict <[format]>, ...); |
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41 | int swprintf(wchar_t *__restrict <[str]>, size_t <[size]>, |
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42 | const wchar_t *__restrict <[format]>, ...); |
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43 | |
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44 | int _wprintf_r(struct _reent *<[ptr]>, const wchar_t *<[format]>, ...); |
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45 | int _fwprintf_r(struct _reent *<[ptr]>, FILE *<[fd]>, |
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46 | const wchar_t *<[format]>, ...); |
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47 | int _swprintf_r(struct _reent *<[ptr]>, wchar_t *<[str]>, |
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48 | size_t <[size]>, const wchar_t *<[format]>, ...); |
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49 | |
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50 | DESCRIPTION |
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51 | <<wprintf>> accepts a series of arguments, applies to each a |
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52 | format specifier from <<*<[format]>>>, and writes the |
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53 | formatted data to <<stdout>>, without a terminating NUL |
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54 | wide character. The behavior of <<wprintf>> is undefined if there |
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55 | are not enough arguments for the format or if any argument is not the |
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56 | right type for the corresponding conversion specifier. <<wprintf>> |
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57 | returns when it reaches the end of the format string. If there are |
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58 | more arguments than the format requires, excess arguments are |
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59 | ignored. |
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60 | |
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61 | <<fwprintf>> is like <<wprintf>>, except that output is directed |
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62 | to the stream <[fd]> rather than <<stdout>>. |
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63 | |
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64 | <<swprintf>> is like <<wprintf>>, except that output is directed |
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65 | to the buffer <[str]> with a terminating wide <<NUL>>, and the |
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66 | resulting string length is limited to at most <[size]> wide characters, |
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67 | including the terminating <<NUL>>. It is considered an error if the |
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68 | output (including the terminating wide-<<NULL>>) does not fit into |
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69 | <[size]> wide characters. (This error behavior is not the same as for |
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70 | <<snprintf>>, which <<swprintf>> is otherwise completely analogous to. |
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71 | While <<snprintf>> allows the needed size to be known simply by giving |
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72 | <[size]>=0, <<swprintf>> does not, giving an error instead.) |
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73 | |
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74 | For <<swprintf>> the behavior is undefined if the output |
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75 | <<*<[str]>>> overlaps with one of the arguments. Behavior is also |
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76 | undefined if the argument for <<%n>> within <<*<[format]>>> |
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77 | overlaps another argument. |
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78 | |
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79 | <[format]> is a pointer to a wide character string containing two |
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80 | types of objects: ordinary characters (other than <<%>>), |
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81 | which are copied unchanged to the output, and conversion |
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82 | specifications, each of which is introduced by <<%>>. (To |
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83 | include <<%>> in the output, use <<%%>> in the format string.) |
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84 | A conversion specification has the following form: |
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85 | |
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86 | . %[<[pos]>][<[flags]>][<[width]>][.<[prec]>][<[size]>]<[type]> |
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87 | |
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88 | The fields of the conversion specification have the following |
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89 | meanings: |
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90 | |
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91 | O+ |
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92 | o <[pos]> |
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93 | |
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94 | Conversions normally consume arguments in the order that they |
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95 | are presented. However, it is possible to consume arguments |
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96 | out of order, and reuse an argument for more than one |
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97 | conversion specification (although the behavior is undefined |
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98 | if the same argument is requested with different types), by |
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99 | specifying <[pos]>, which is a decimal integer followed by |
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100 | '$'. The integer must be between 1 and <NL_ARGMAX> from |
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101 | limits.h, and if argument <<%n$>> is requested, all earlier |
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102 | arguments must be requested somewhere within <[format]>. If |
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103 | positional parameters are used, then all conversion |
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104 | specifications except for <<%%>> must specify a position. |
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105 | This positional parameters method is a POSIX extension to the C |
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106 | standard definition for the functions. |
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107 | |
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108 | o <[flags]> |
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109 | |
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110 | <[flags]> is an optional sequence of characters which control |
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111 | output justification, numeric signs, decimal points, trailing |
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112 | zeros, and octal and hex prefixes. The flag characters are |
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113 | minus (<<->>), plus (<<+>>), space ( ), zero (<<0>>), sharp |
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114 | (<<#>>), and quote (<<'>>). They can appear in any |
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115 | combination, although not all flags can be used for all |
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116 | conversion specification types. |
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117 | |
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118 | o+ |
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119 | o ' |
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120 | A POSIX extension to the C standard. However, this |
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121 | implementation presently treats it as a no-op, which |
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122 | is the default behavior for the C locale, anyway. (If |
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123 | it did what it is supposed to, when <[type]> were <<i>>, |
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124 | <<d>>, <<u>>, <<f>>, <<F>>, <<g>>, or <<G>>, the |
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125 | integer portion of the conversion would be formatted |
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126 | with thousands' grouping wide characters.) |
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127 | |
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128 | o - |
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129 | The result of the conversion is left |
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130 | justified, and the right is padded with |
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131 | blanks. If you do not use this flag, the |
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132 | result is right justified, and padded on the |
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133 | left. |
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134 | |
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135 | o + |
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136 | The result of a signed conversion (as |
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137 | determined by <[type]> of <<d>>, <<i>>, <<a>>, |
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138 | <<A>>, <<e>>, <<E>>, <<f>>, <<F>>, <<g>>, or |
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139 | <<G>>) will always begin with a plus or minus |
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140 | sign. (If you do not use this flag, positive |
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141 | values do not begin with a plus sign.) |
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142 | |
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143 | o " " (space) |
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144 | If the first character of a signed conversion |
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145 | specification is not a sign, or if a signed |
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146 | conversion results in no characters, the |
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147 | result will begin with a space. If the space |
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148 | ( ) flag and the plus (<<+>>) flag both |
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149 | appear, the space flag is ignored. |
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150 | |
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151 | o 0 |
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152 | If the <[type]> character is <<d>>, <<i>>, |
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153 | <<o>>, <<u>>, <<x>>, <<X>>, <<a>>, <<A>>, |
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154 | <<e>>, <<E>>, <<f>>, <<F>>, <<g>>, or <<G>>: leading |
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155 | zeros are used to pad the field width |
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156 | (following any indication of sign or base); no |
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157 | spaces are used for padding. If the zero |
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158 | (<<0>>) and minus (<<->>) flags both appear, |
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159 | the zero (<<0>>) flag will be ignored. For |
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160 | <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, and <<X>> |
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161 | conversions, if a precision <[prec]> is |
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162 | specified, the zero (<<0>>) flag is ignored. |
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163 | |
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164 | Note that <<0>> is interpreted as a flag, not |
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165 | as the beginning of a field width. |
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166 | |
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167 | o # |
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168 | The result is to be converted to an |
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169 | alternative form, according to the <[type]> |
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170 | character. |
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171 | o- |
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172 | |
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173 | The alternative form output with the # flag depends on the <[type]> |
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174 | character: |
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175 | |
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176 | o+ |
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177 | o o |
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178 | Increases precision to force the first |
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179 | digit of the result to be a zero. |
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180 | |
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181 | o x |
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182 | A non-zero result will have a <<0x>> |
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183 | prefix. |
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184 | |
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185 | o X |
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186 | A non-zero result will have a <<0X>> |
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187 | prefix. |
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188 | |
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189 | o a, A, e, E, f, or F |
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190 | The result will always contain a |
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191 | decimal point even if no digits follow |
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192 | the point. (Normally, a decimal point |
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193 | appears only if a digit follows it.) |
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194 | Trailing zeros are removed. |
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195 | |
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196 | o g or G |
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197 | The result will always contain a |
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198 | decimal point even if no digits follow |
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199 | the point. Trailing zeros are not |
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200 | removed. |
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201 | |
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202 | o all others |
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203 | Undefined. |
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204 | |
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205 | o- |
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206 | |
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207 | |
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208 | o <[width]> |
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209 | |
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210 | <[width]> is an optional minimum field width. You can |
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211 | either specify it directly as a decimal integer, or |
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212 | indirectly by using instead an asterisk (<<*>>), in |
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213 | which case an <<int>> argument is used as the field |
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214 | width. If positional arguments are used, then the |
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215 | width must also be specified positionally as <<*m$>>, |
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216 | with m as a decimal integer. Negative field widths |
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217 | are treated as specifying the minus (<<->>) flag for |
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218 | left justfication, along with a positive field width. |
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219 | The resulting format may be wider than the specified |
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220 | width. |
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221 | |
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222 | o <[prec]> |
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223 | |
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224 | <[prec]> is an optional field; if present, it is |
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225 | introduced with `<<.>>' (a period). You can specify |
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226 | the precision either directly as a decimal integer or |
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227 | indirectly by using an asterisk (<<*>>), in which case |
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228 | an <<int>> argument is used as the precision. If |
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229 | positional arguments are used, then the precision must |
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230 | also be specified positionally as <<*m$>>, with m as a |
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231 | decimal integer. Supplying a negative precision is |
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232 | equivalent to omitting the precision. If only a |
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233 | period is specified the precision is zero. The effect |
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234 | depends on the conversion <[type]>. |
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235 | |
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236 | o+ |
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237 | o d, i, o, u, x, or X |
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238 | Minimum number of digits to appear. If no |
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239 | precision is given, defaults to 1. |
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240 | |
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241 | o a or A |
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242 | Number of digits to appear after the decimal |
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243 | point. If no precision is given, the |
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244 | precision defaults to the minimum needed for |
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245 | an exact representation. |
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246 | |
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247 | o e, E, f or F |
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248 | Number of digits to appear after the decimal |
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249 | point. If no precision is given, the |
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250 | precision defaults to 6. |
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251 | |
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252 | o g or G |
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253 | Maximum number of significant digits. A |
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254 | precision of 0 is treated the same as a |
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255 | precision of 1. If no precision is given, the |
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256 | precision defaults to 6. |
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257 | |
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258 | o s or S |
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259 | Maximum number of characters to print from the |
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260 | string. If no precision is given, the entire |
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261 | string is printed. |
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262 | |
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263 | o all others |
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264 | undefined. |
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265 | |
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266 | o- |
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267 | |
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268 | o <[size]> |
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269 | |
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270 | <[size]> is an optional modifier that changes the data |
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271 | type that the corresponding argument has. Behavior is |
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272 | unspecified if a size is given that does not match the |
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273 | <[type]>. |
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274 | |
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275 | o+ |
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276 | o hh |
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277 | With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or |
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278 | <<X>>, specifies that the argument should be |
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279 | converted to a <<signed char>> or <<unsigned |
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280 | char>> before printing. |
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281 | |
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282 | With <<n>>, specifies that the argument is a |
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283 | pointer to a <<signed char>>. |
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284 | |
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285 | o h |
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286 | With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or |
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287 | <<X>>, specifies that the argument should be |
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288 | converted to a <<short>> or <<unsigned short>> |
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289 | before printing. |
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290 | |
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291 | With <<n>>, specifies that the argument is a |
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292 | pointer to a <<short>>. |
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293 | |
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294 | o l |
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295 | With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or |
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296 | <<X>>, specifies that the argument is a |
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297 | <<long>> or <<unsigned long>>. |
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298 | |
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299 | With <<c>>, specifies that the argument has |
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300 | type <<wint_t>>. |
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301 | |
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302 | With <<s>>, specifies that the argument is a |
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303 | pointer to <<wchar_t>>. |
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304 | |
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305 | With <<n>>, specifies that the argument is a |
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306 | pointer to a <<long>>. |
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307 | |
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308 | With <<a>>, <<A>>, <<e>>, <<E>>, <<f>>, <<F>>, |
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309 | <<g>>, or <<G>>, has no effect (because of |
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310 | vararg promotion rules, there is no need to |
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311 | distinguish between <<float>> and <<double>>). |
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312 | |
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313 | o ll |
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314 | With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or |
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315 | <<X>>, specifies that the argument is a |
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316 | <<long long>> or <<unsigned long long>>. |
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317 | |
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318 | With <<n>>, specifies that the argument is a |
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319 | pointer to a <<long long>>. |
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320 | |
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321 | o j |
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322 | With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or |
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323 | <<X>>, specifies that the argument is an |
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324 | <<intmax_t>> or <<uintmax_t>>. |
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325 | |
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326 | With <<n>>, specifies that the argument is a |
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327 | pointer to an <<intmax_t>>. |
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328 | |
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329 | o z |
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330 | With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or |
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331 | <<X>>, specifies that the argument is a <<size_t>>. |
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332 | |
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333 | With <<n>>, specifies that the argument is a |
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334 | pointer to a <<size_t>>. |
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335 | |
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336 | o t |
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337 | With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or |
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338 | <<X>>, specifies that the argument is a |
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339 | <<ptrdiff_t>>. |
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340 | |
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341 | With <<n>>, specifies that the argument is a |
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342 | pointer to a <<ptrdiff_t>>. |
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343 | |
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344 | o L |
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345 | With <<a>>, <<A>>, <<e>>, <<E>>, <<f>>, <<F>>, |
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346 | <<g>>, or <<G>>, specifies that the argument |
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347 | is a <<long double>>. |
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348 | |
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349 | o- |
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350 | |
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351 | o <[type]> |
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352 | |
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353 | <[type]> specifies what kind of conversion <<wprintf>> |
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354 | performs. Here is a table of these: |
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355 | |
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356 | o+ |
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357 | o % |
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358 | Prints the percent character (<<%>>). |
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359 | |
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360 | o c |
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361 | If no <<l>> qualifier is present, the int argument shall |
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362 | be converted to a wide character as if by calling |
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363 | the btowc() function and the resulting wide character |
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364 | shall be written. Otherwise, the wint_t argument |
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365 | shall be converted to wchar_t, and written. |
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366 | |
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367 | o C |
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368 | Short for <<%lc>>. A POSIX extension to the C standard. |
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369 | |
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370 | o s |
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371 | If no <<l>> qualifier is present, the application |
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372 | shall ensure that the argument is a pointer to a |
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373 | character array containing a character sequence |
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374 | beginning in the initial shift state. Characters |
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375 | from the array shall be converted as if by repeated |
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376 | calls to the mbrtowc() function, with the conversion |
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377 | state described by an mbstate_t object initialized to |
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378 | zero before the first character is converted, and |
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379 | written up to (but not including) the terminating |
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380 | null wide character. If the precision is specified, |
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381 | no more than that many wide characters shall be |
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382 | written. If the precision is not specified, or is |
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383 | greater than the size of the array, the application |
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384 | shall ensure that the array contains a null wide |
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385 | character. |
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386 | |
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387 | If an <<l>> qualifier is present, the application |
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388 | shall ensure that the argument is a pointer to an |
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389 | array of type wchar_t. Wide characters from the array |
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390 | shall be written up to (but not including) a |
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391 | terminating null wide character. If no precision is |
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392 | specified, or is greater than the size of the array, |
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393 | the application shall ensure that the array contains |
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394 | a null wide character. If a precision is specified, |
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395 | no more than that many wide characters shall be |
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396 | written. |
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397 | |
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398 | o S |
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399 | Short for <<%ls>>. A POSIX extension to the C standard. |
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400 | |
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401 | o d or i |
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402 | Prints a signed decimal integer; takes an |
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403 | <<int>>. Leading zeros are inserted as |
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404 | necessary to reach the precision. A value of 0 with |
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405 | a precision of 0 produces an empty string. |
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406 | |
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407 | o o |
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408 | Prints an unsigned octal integer; takes an |
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409 | <<unsigned>>. Leading zeros are inserted as |
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410 | necessary to reach the precision. A value of 0 with |
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411 | a precision of 0 produces an empty string. |
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412 | |
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413 | o u |
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414 | Prints an unsigned decimal integer; takes an |
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415 | <<unsigned>>. Leading zeros are inserted as |
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416 | necessary to reach the precision. A value of 0 with |
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417 | a precision of 0 produces an empty string. |
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418 | |
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419 | o x |
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420 | Prints an unsigned hexadecimal integer (using |
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421 | <<abcdef>> as digits beyond <<9>>); takes an |
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422 | <<unsigned>>. Leading zeros are inserted as |
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423 | necessary to reach the precision. A value of 0 with |
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424 | a precision of 0 produces an empty string. |
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425 | |
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426 | o X |
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427 | Like <<x>>, but uses <<ABCDEF>> as digits |
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428 | beyond <<9>>. |
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429 | |
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430 | o f |
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431 | Prints a signed value of the form |
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432 | <<[-]9999.9999>>, with the precision |
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433 | determining how many digits follow the decimal |
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434 | point; takes a <<double>> (remember that |
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435 | <<float>> promotes to <<double>> as a vararg). |
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436 | The low order digit is rounded to even. If |
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437 | the precision results in at most DECIMAL_DIG |
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438 | digits, the result is rounded correctly; if |
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439 | more than DECIMAL_DIG digits are printed, the |
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440 | result is only guaranteed to round back to the |
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441 | original value. |
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442 | |
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443 | If the value is infinite, the result is |
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444 | <<inf>>, and no zero padding is performed. If |
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445 | the value is not a number, the result is |
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446 | <<nan>>, and no zero padding is performed. |
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447 | |
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448 | o F |
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449 | Like <<f>>, but uses <<INF>> and <<NAN>> for |
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450 | non-finite numbers. |
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451 | |
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452 | o e |
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453 | Prints a signed value of the form |
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454 | <<[-]9.9999e[+|-]999>>; takes a <<double>>. |
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455 | The digit before the decimal point is non-zero |
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456 | if the value is non-zero. The precision |
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457 | determines how many digits appear between |
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458 | <<.>> and <<e>>, and the exponent always |
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459 | contains at least two digits. The value zero |
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460 | has an exponent of zero. If the value is not |
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461 | finite, it is printed like <<f>>. |
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462 | |
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463 | o E |
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464 | Like <<e>>, but using <<E>> to introduce the |
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465 | exponent, and like <<F>> for non-finite |
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466 | values. |
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467 | |
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468 | o g |
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469 | Prints a signed value in either <<f>> or <<e>> |
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470 | form, based on the given value and |
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471 | precision---an exponent less than -4 or |
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472 | greater than the precision selects the <<e>> |
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473 | form. Trailing zeros and the decimal point |
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474 | are printed only if necessary; takes a |
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475 | <<double>>. |
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476 | |
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477 | o G |
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478 | Like <<g>>, except use <<F>> or <<E>> form. |
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479 | |
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480 | o a |
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481 | Prints a signed value of the form |
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482 | <<[-]0x1.ffffp[+|-]9>>; takes a <<double>>. |
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483 | The letters <<abcdef>> are used for digits |
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484 | beyond <<9>>. The precision determines how |
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485 | many digits appear after the decimal point. |
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486 | The exponent contains at least one digit, and |
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487 | is a decimal value representing the power of |
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488 | 2; a value of 0 has an exponent of 0. |
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489 | Non-finite values are printed like <<f>>. |
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490 | |
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491 | o A |
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492 | Like <<a>>, except uses <<X>>, <<P>>, and |
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493 | <<ABCDEF>> instead of lower case. |
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494 | |
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495 | o n |
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496 | Takes a pointer to <<int>>, and stores a count |
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497 | of the number of bytes written so far. No |
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498 | output is created. |
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499 | |
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500 | o p |
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501 | Takes a pointer to <<void>>, and prints it in |
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502 | an implementation-defined format. This |
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503 | implementation is similar to <<%#tx>>), except |
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504 | that <<0x>> appears even for the NULL pointer. |
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505 | |
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506 | o m |
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507 | Prints the output of <<strerror(errno)>>; no |
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508 | argument is required. A GNU extension. |
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509 | |
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510 | o- |
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511 | O- |
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512 | |
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513 | <<_wprintf_r>>, <<_fwprintf_r>>, <<_swprintf_r>>, are simply |
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514 | reentrant versions of the functions above. |
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515 | |
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516 | RETURNS |
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517 | On success, <<swprintf>> return the number of wide characters in |
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518 | the output string, except the concluding <<NUL>> is not counted. |
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519 | <<wprintf>> and <<fwprintf>> return the number of characters transmitted. |
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520 | |
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521 | If an error occurs, the result of <<wprintf>>, <<fwprintf>>, and |
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522 | <<swprintf>> is a negative value. For <<wprintf>> and <<fwprintf>>, |
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523 | <<errno>> may be set according to <<fputwc>>. For <<swprintf>>, <<errno>> |
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524 | may be set to EOVERFLOW if <[size]> is greater than INT_MAX / sizeof (wchar_t), |
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525 | or when the output does not fit into <[size]> wide characters (including the |
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526 | terminating wide <<NULL>>). |
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527 | |
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528 | BUGS |
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529 | The ``''' (quote) flag does not work when locale's thousands_sep is not empty. |
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530 | |
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531 | PORTABILITY |
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532 | POSIX-1.2008 with extensions; C99 (compliant except for POSIX extensions). |
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533 | |
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534 | Depending on how newlib was configured, not all format specifiers are |
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535 | supported. |
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536 | |
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537 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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538 | <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
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539 | */ |
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540 | |
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541 | |
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542 | #include <_ansi.h> |
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543 | #include <reent.h> |
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544 | #include <stdio.h> |
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545 | #include <wchar.h> |
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546 | #include <stdarg.h> |
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547 | #include <limits.h> |
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548 | #include <errno.h> |
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549 | #include "local.h" |
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550 | |
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551 | /* NOTE: _swprintf_r() should be identical to swprintf() except for the |
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552 | * former having ptr as a parameter and the latter needing to declare it as |
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553 | * a variable set to _REENT. */ |
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554 | |
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555 | int |
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556 | _swprintf_r (struct _reent *ptr, |
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557 | wchar_t *str, |
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558 | size_t size, |
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559 | const wchar_t *fmt, ...) |
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560 | { |
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561 | int ret; |
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562 | va_list ap; |
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563 | FILE f; |
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564 | |
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565 | if (size > INT_MAX / sizeof (wchar_t)) |
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566 | { |
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567 | ptr->_errno = EOVERFLOW; /* POSIX extension */ |
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568 | return EOF; |
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569 | } |
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570 | f._flags = __SWR | __SSTR; |
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571 | f._bf._base = f._p = (unsigned char *) str; |
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572 | f._bf._size = f._w = (size > 0 ? (size - 1) * sizeof (wchar_t) : 0); |
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573 | f._file = -1; /* No file. */ |
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574 | va_start (ap, fmt); |
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575 | ret = _svfwprintf_r (ptr, &f, fmt, ap); |
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576 | va_end (ap); |
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577 | /* _svfwprintf_r() does not put in a terminating NUL, so add one if |
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578 | * appropriate, which is whenever size is > 0. _svfwprintf_r() stops |
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579 | * after n-1, so always just put at the end. */ |
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580 | if (size > 0) { |
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581 | *(wchar_t *)f._p = L'\0'; /* terminate the string */ |
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582 | } |
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583 | if(ret >= size) { |
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584 | /* _svfwprintf_r() returns how many wide characters it would have printed |
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585 | * if there were enough space. Return an error if too big to fit in str, |
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586 | * unlike snprintf, which returns the size needed. */ |
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587 | ptr->_errno = EOVERFLOW; /* POSIX extension */ |
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588 | ret = -1; |
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589 | } |
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590 | return (ret); |
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591 | } |
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592 | |
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593 | #ifndef _REENT_ONLY |
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594 | |
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595 | int |
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596 | swprintf (wchar_t *__restrict str, |
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597 | size_t size, |
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598 | const wchar_t *__restrict fmt, ...) |
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599 | { |
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600 | int ret; |
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601 | va_list ap; |
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602 | FILE f; |
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603 | struct _reent *ptr = _REENT; |
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604 | |
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605 | if (size > INT_MAX / sizeof (wchar_t)) |
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606 | { |
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607 | ptr->_errno = EOVERFLOW; /* POSIX extension */ |
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608 | return EOF; |
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609 | } |
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610 | f._flags = __SWR | __SSTR; |
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611 | f._bf._base = f._p = (unsigned char *) str; |
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612 | f._bf._size = f._w = (size > 0 ? (size - 1) * sizeof (wchar_t) : 0); |
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613 | f._file = -1; /* No file. */ |
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614 | va_start (ap, fmt); |
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615 | ret = _svfwprintf_r (ptr, &f, fmt, ap); |
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616 | va_end (ap); |
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617 | /* _svfwprintf_r() does not put in a terminating NUL, so add one if |
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618 | * appropriate, which is whenever size is > 0. _svfwprintf_r() stops |
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619 | * after n-1, so always just put at the end. */ |
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620 | if (size > 0) { |
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621 | *(wchar_t *)f._p = L'\0'; /* terminate the string */ |
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622 | } |
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623 | if(ret >= size) { |
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624 | /* _svfwprintf_r() returns how many wide characters it would have printed |
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625 | * if there were enough space. Return an error if too big to fit in str, |
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626 | * unlike snprintf, which returns the size needed. */ |
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627 | ptr->_errno = EOVERFLOW; /* POSIX extension */ |
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628 | ret = -1; |
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629 | } |
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630 | return (ret); |
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631 | } |
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632 | |
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633 | #endif |
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