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4349 | Serge | 1 | /* |
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 | |||
18 | /* |
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19 | FUNCTION |
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20 | < |
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21 | |||
22 | INDEX |
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23 | fprintf |
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24 | INDEX |
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25 | _fprintf_r |
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26 | INDEX |
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27 | printf |
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28 | INDEX |
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29 | _printf_r |
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30 | INDEX |
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31 | asprintf |
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32 | INDEX |
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33 | _asprintf_r |
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34 | INDEX |
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35 | sprintf |
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36 | INDEX |
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37 | _sprintf_r |
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38 | INDEX |
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39 | snprintf |
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40 | INDEX |
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41 | _snprintf_r |
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42 | INDEX |
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43 | asnprintf |
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44 | INDEX |
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45 | _asnprintf_r |
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46 | |||
47 | ANSI_SYNOPSIS |
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48 | #include |
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49 | |||
4921 | Serge | 50 | int printf(const char *restrict <[format]>, ...); |
51 | int fprintf(FILE *restrict <[fd]>, const char *restrict <[format]>, ...); |
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52 | int sprintf(char *restrict <[str]>, const char *restrict <[format]>, ...); |
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53 | int snprintf(char *restrict <[str]>, size_t <[size]>, const char *restrict <[format]>, |
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4349 | Serge | 54 | ...); |
4921 | Serge | 55 | int asprintf(char **restrict <[strp]>, const char *restrict <[format]>, ...); |
56 | char *asnprintf(char *restrict <[str]>, size_t *restrict <[size]>, const char *restrict <[format]>, |
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4349 | Serge | 57 | ...); |
58 | |||
4921 | Serge | 59 | int _printf_r(struct _reent *<[ptr]>, const char *restrict <[format]>, ...); |
60 | int _fprintf_r(struct _reent *<[ptr]>, FILE *restrict <[fd]>, |
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61 | const char *restrict <[format]>, ...); |
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62 | int _sprintf_r(struct _reent *<[ptr]>, char *restrict <[str]>, |
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63 | const char *restrict <[format]>, ...); |
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64 | int _snprintf_r(struct _reent *<[ptr]>, char *restrict <[str]>, size_t <[size]>, |
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65 | const char *restrict <[format]>, ...); |
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66 | int _asprintf_r(struct _reent *<[ptr]>, char **restrict <[strp]>, |
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67 | const char *restrict <[format]>, ...); |
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68 | char *_asnprintf_r(struct _reent *<[ptr]>, char *restrict <[str]>, |
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69 | size_t *restrict <[size]>, const char *restrict <[format]>, ...); |
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4349 | Serge | 70 | |
71 | DESCRIPTION |
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72 | < |
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73 | format specifier from <<*<[format]>>>, and writes the |
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74 | formatted data to < |
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75 | character. The behavior of < |
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76 | are not enough arguments for the format. < |
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77 | when it reaches the end of the format string. If there are |
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78 | more arguments than the format requires, excess arguments are |
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79 | ignored. |
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80 | |||
81 | < |
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82 | to the stream <[fd]> rather than < |
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83 | |||
84 | < |
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85 | to the buffer <[str]>, and a terminating NUL is output. |
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86 | Behavior is undefined if more output is generated than the |
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87 | buffer can hold. |
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88 | |||
89 | < |
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90 | limited to at most <[size]> bytes, including the terminating |
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91 | < |
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92 | NULL, and < |
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93 | be printed. |
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94 | |||
95 | < |
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96 | stored in a dynamically allocated buffer, <[pstr]>, which |
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97 | should be freed later with < |
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98 | |||
99 | < |
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100 | is either the original <[str]> if it was large enough, or a |
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101 | dynamically allocated string if the output exceeds *<[size]>; |
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102 | the length of the result is returned in *<[size]>. When |
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103 | dynamic allocation occurs, the contents of the original |
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104 | <[str]> may have been modified. |
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105 | |||
106 | For < |
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107 | is undefined if the output <<*<[str]>>> overlaps with one of |
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108 | the arguments. Behavior is also undefined if the argument for |
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109 | <<%n>> within <<*<[format]>>> overlaps another argument. |
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110 | |||
111 | <[format]> is a pointer to a character string containing two |
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112 | types of objects: ordinary characters (other than <<%>>), |
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113 | which are copied unchanged to the output, and conversion |
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114 | specifications, each of which is introduced by <<%>>. (To |
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115 | include <<%>> in the output, use <<%%>> in the format string.) |
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116 | A conversion specification has the following form: |
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117 | |||
118 | . %[<[pos]>][<[flags]>][<[width]>][.<[prec]>][<[size]>]<[type]> |
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119 | |||
120 | The fields of the conversion specification have the following |
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121 | meanings: |
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122 | |||
123 | O+ |
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124 | o <[pos]> |
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125 | |||
126 | Conversions normally consume arguments in the order that they |
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127 | are presented. However, it is possible to consume arguments |
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128 | out of order, and reuse an argument for more than one |
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129 | conversion specification (although the behavior is undefined |
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130 | if the same argument is requested with different types), by |
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131 | specifying <[pos]>, which is a decimal integer followed by |
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132 | '$'. The integer must be between 1 and |
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133 | limits.h, and if argument <<%n$>> is requested, all earlier |
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134 | arguments must be requested somewhere within <[format]>. If |
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135 | positional parameters are used, then all conversion |
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136 | specifications except for <<%%>> must specify a position. |
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137 | This positional parameters method is a POSIX extension to the C |
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138 | standard definition for the functions. |
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139 | |||
140 | o <[flags]> |
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141 | |||
142 | <[flags]> is an optional sequence of characters which control |
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143 | output justification, numeric signs, decimal points, trailing |
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144 | zeros, and octal and hex prefixes. The flag characters are |
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145 | minus (<<->>), plus (<<+>>), space ( ), zero (<<0>>), sharp |
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146 | (<<#>>), and quote (<<'>>). They can appear in any |
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147 | combination, although not all flags can be used for all |
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148 | conversion specification types. |
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149 | |||
150 | o+ |
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151 | o ' |
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152 | A POSIX extension to the C standard. However, this |
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153 | implementation presently treats it as a no-op, which |
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154 | is the default behavior for the C locale, anyway. (If |
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155 | it did what it is supposed to, when <[type]> were <>, |
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156 | < |
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157 | integer portion of the conversion would be formatted |
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158 | with thousands' grouping wide characters.) |
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159 | |||
160 | o - |
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161 | The result of the conversion is left |
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162 | justified, and the right is padded with |
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163 | blanks. If you do not use this flag, the |
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164 | result is right justified, and padded on the |
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165 | left. |
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166 | |||
167 | o + |
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168 | The result of a signed conversion (as |
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169 | determined by <[type]> of < |
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170 | <>, < |
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171 | < |
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172 | sign. (If you do not use this flag, positive |
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173 | values do not begin with a plus sign.) |
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174 | |||
175 | o " " (space) |
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176 | If the first character of a signed conversion |
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177 | specification is not a sign, or if a signed |
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178 | conversion results in no characters, the |
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179 | result will begin with a space. If the space |
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180 | ( ) flag and the plus (<<+>>) flag both |
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181 | appear, the space flag is ignored. |
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182 | |||
183 | o 0 |
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184 | If the <[type]> character is < |
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185 | < |
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186 | < |
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187 | zeros are used to pad the field width |
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188 | (following any indication of sign or base); no |
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189 | spaces are used for padding. If the zero |
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190 | (<<0>>) and minus (<<->>) flags both appear, |
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191 | the zero (<<0>>) flag will be ignored. For |
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192 | < |
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193 | conversions, if a precision <[prec]> is |
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194 | specified, the zero (<<0>>) flag is ignored. |
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195 | |||
196 | Note that <<0>> is interpreted as a flag, not |
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197 | as the beginning of a field width. |
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198 | |||
199 | o # |
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200 | The result is to be converted to an |
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201 | alternative form, according to the <[type]> |
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6099 | serge | 202 | character. |
203 | o- |
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4349 | Serge | 204 | |
6099 | serge | 205 | The alternative form output with the # flag depends on the <[type]> |
206 | character: |
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4349 | Serge | 207 | |
6099 | serge | 208 | o+ |
209 | o o |
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210 | Increases precision to force the first |
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211 | digit of the result to be a zero. |
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4349 | Serge | 212 | |
6099 | serge | 213 | o x |
214 | A non-zero result will have a <<0x>> |
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215 | prefix. |
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4349 | Serge | 216 | |
6099 | serge | 217 | o X |
218 | A non-zero result will have a <<0X>> |
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219 | prefix. |
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4349 | Serge | 220 | |
6099 | serge | 221 | o a, A, e, E, f, or F |
222 | The result will always contain a |
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223 | decimal point even if no digits follow |
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224 | the point. (Normally, a decimal point |
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225 | appears only if a digit follows it.) |
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226 | Trailing zeros are removed. |
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4349 | Serge | 227 | |
6099 | serge | 228 | o g or G |
229 | The result will always contain a |
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230 | decimal point even if no digits follow |
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231 | the point. Trailing zeros are not |
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232 | removed. |
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4349 | Serge | 233 | |
6099 | serge | 234 | o all others |
235 | Undefined. |
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236 | |||
4349 | Serge | 237 | o- |
238 | |||
239 | o <[width]> |
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240 | |||
241 | <[width]> is an optional minimum field width. You can |
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242 | either specify it directly as a decimal integer, or |
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243 | indirectly by using instead an asterisk (<<*>>), in |
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244 | which case an < |
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245 | width. If positional arguments are used, then the |
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246 | width must also be specified positionally as <<*m$>>, |
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247 | with m as a decimal integer. Negative field widths |
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248 | are treated as specifying the minus (<<->>) flag for |
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249 | left justfication, along with a positive field width. |
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250 | The resulting format may be wider than the specified |
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251 | width. |
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252 | |||
253 | o <[prec]> |
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254 | |||
255 | <[prec]> is an optional field; if present, it is |
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256 | introduced with `<<.>>' (a period). You can specify |
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257 | the precision either directly as a decimal integer or |
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258 | indirectly by using an asterisk (<<*>>), in which case |
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259 | an < |
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260 | positional arguments are used, then the precision must |
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261 | also be specified positionally as <<*m$>>, with m as a |
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262 | decimal integer. Supplying a negative precision is |
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263 | equivalent to omitting the precision. If only a |
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264 | period is specified the precision is zero. The effect |
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265 | depends on the conversion <[type]>. |
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266 | |||
267 | o+ |
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268 | o d, i, o, u, x, or X |
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269 | Minimum number of digits to appear. If no |
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270 | precision is given, defaults to 1. |
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271 | |||
272 | o a or A |
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273 | Number of digits to appear after the decimal |
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274 | point. If no precision is given, the |
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275 | precision defaults to the minimum needed for |
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276 | an exact representation. |
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277 | |||
278 | o e, E, f or F |
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279 | Number of digits to appear after the decimal |
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280 | point. If no precision is given, the |
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281 | precision defaults to 6. |
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282 | |||
283 | o g or G |
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284 | Maximum number of significant digits. A |
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285 | precision of 0 is treated the same as a |
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286 | precision of 1. If no precision is given, the |
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287 | precision defaults to 6. |
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288 | |||
289 | o s or S |
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290 | Maximum number of characters to print from the |
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291 | string. If no precision is given, the entire |
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292 | string is printed. |
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293 | |||
294 | o all others |
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295 | undefined. |
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296 | |||
297 | o- |
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298 | |||
299 | o <[size]> |
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300 | |||
301 | <[size]> is an optional modifier that changes the data |
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302 | type that the corresponding argument has. Behavior is |
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303 | unspecified if a size is given that does not match the |
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304 | <[type]>. |
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305 | |||
306 | o+ |
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307 | o hh |
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308 | With < |
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309 | < |
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310 | converted to a < |
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311 | char>> before printing. |
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312 | |||
313 | With < |
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314 | pointer to a < |
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315 | |||
316 | o h |
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317 | With < |
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318 | < |
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319 | converted to a < |
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320 | before printing. |
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321 | |||
322 | With < |
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323 | pointer to a < |
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324 | |||
325 | o l |
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326 | With < |
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327 | < |
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328 | < |
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329 | |||
330 | With < |
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331 | type < |
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332 | |||
333 | With < |
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334 | pointer to < |
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335 | |||
336 | With < |
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337 | pointer to a < |
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338 | |||
339 | With <>, <>, < |
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340 | < |
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341 | vararg promotion rules, there is no need to |
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342 | distinguish between < |
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343 | |||
344 | o ll |
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345 | With < |
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346 | < |
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347 | < |
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348 | |||
349 | With < |
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350 | pointer to a < |
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351 | |||
352 | o j |
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353 | With < |
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354 | < |
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355 | < |
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356 | |||
357 | With < |
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358 | pointer to an < |
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359 | |||
360 | o z |
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361 | With < |
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362 | < |
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363 | |||
364 | With < |
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365 | pointer to a < |
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366 | |||
367 | o t |
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368 | With < |
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369 | < |
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370 | < |
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371 | |||
372 | With < |
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373 | pointer to a < |
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374 | |||
375 | o L |
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376 | With <>, <>, < |
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377 | < |
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378 | is a < |
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379 | |||
380 | o- |
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381 | |||
382 | o <[type]> |
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383 | |||
384 | <[type]> specifies what kind of conversion < |
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385 | performs. Here is a table of these: |
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386 | |||
387 | o+ |
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388 | o % |
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389 | Prints the percent character (<<%>>). |
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390 | |||
391 | o c |
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392 | Prints <[arg]> as single character. If the |
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393 | < |
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394 | character is printed. |
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395 | |||
396 | o C |
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397 | Short for <<%lc>>. A POSIX extension to the C standard. |
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398 | |||
399 | o s |
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400 | Prints the elements of a pointer to < |
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401 | until the precision or a null character is |
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402 | reached. If the < |
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403 | effect, the pointer is to an array of |
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404 | < |
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405 | multibyte characters before printing. |
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406 | |||
407 | o S |
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408 | Short for <<%ls>>. A POSIX extension to the C standard. |
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409 | |||
410 | o d or i |
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411 | Prints a signed decimal integer; takes an |
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412 | < |
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413 | necessary to reach the precision. A value of 0 with |
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414 | a precision of 0 produces an empty string. |
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415 | |||
416 | o D |
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417 | Newlib extension, short for <<%ld>>. |
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418 | |||
419 | o o |
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420 | Prints an unsigned octal integer; takes an |
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421 | < |
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422 | necessary to reach the precision. A value of 0 with |
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423 | a precision of 0 produces an empty string. |
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424 | |||
425 | o O |
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426 | Newlib extension, short for <<%lo>>. |
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427 | |||
428 | o u |
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429 | Prints an unsigned decimal integer; takes an |
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430 | < |
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431 | necessary to reach the precision. A value of 0 with |
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432 | a precision of 0 produces an empty string. |
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433 | |||
434 | o U |
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435 | Newlib extension, short for <<%lu>>. |
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436 | |||
437 | o x |
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438 | Prints an unsigned hexadecimal integer (using |
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439 | < |
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440 | < |
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441 | necessary to reach the precision. A value of 0 with |
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442 | a precision of 0 produces an empty string. |
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443 | |||
444 | o X |
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445 | Like < |
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446 | beyond <<9>>. |
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447 | |||
448 | o f |
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449 | Prints a signed value of the form |
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450 | <<[-]9999.9999>>, with the precision |
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451 | determining how many digits follow the decimal |
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452 | point; takes a < |
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453 | < |
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454 | The low order digit is rounded to even. If |
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455 | the precision results in at most DECIMAL_DIG |
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456 | digits, the result is rounded correctly; if |
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457 | more than DECIMAL_DIG digits are printed, the |
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458 | result is only guaranteed to round back to the |
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459 | original value. |
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460 | |||
461 | If the value is infinite, the result is |
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462 | < |
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463 | the value is not a number, the result is |
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464 | < |
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465 | |||
466 | o F |
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467 | Like < |
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468 | non-finite numbers. |
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469 | |||
470 | o e |
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471 | Prints a signed value of the form |
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472 | <<[-]9.9999e[+|-]999>>; takes a < |
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473 | The digit before the decimal point is non-zero |
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474 | if the value is non-zero. The precision |
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475 | determines how many digits appear between |
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476 | <<.>> and < |
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477 | contains at least two digits. The value zero |
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478 | has an exponent of zero. If the value is not |
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479 | finite, it is printed like < |
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480 | |||
481 | o E |
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482 | Like < |
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483 | exponent, and like < |
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484 | values. |
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485 | |||
486 | o g |
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487 | Prints a signed value in either < |
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488 | form, based on the given value and |
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489 | precision---an exponent less than -4 or |
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490 | greater than the precision selects the < |
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491 | form. Trailing zeros and the decimal point |
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492 | are printed only if necessary; takes a |
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493 | < |
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494 | |||
495 | o G |
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496 | Like < |
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497 | |||
498 | o a |
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499 | Prints a signed value of the form |
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500 | <<[-]0x1.ffffp[+|-]9>>; takes a < |
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501 | The letters < |
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502 | beyond <<9>>. The precision determines how |
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503 | many digits appear after the decimal point. |
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504 | The exponent contains at least one digit, and |
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505 | is a decimal value representing the power of |
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506 | 2; a value of 0 has an exponent of 0. |
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507 | Non-finite values are printed like < |
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508 | |||
509 | o A |
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510 | Like <>, except uses < |
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511 | < |
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512 | |||
513 | o n |
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514 | Takes a pointer to < |
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515 | of the number of bytes written so far. No |
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516 | output is created. |
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517 | |||
518 | o p |
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519 | Takes a pointer to < |
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520 | an implementation-defined format. This |
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521 | implementation is similar to <<%#tx>>), except |
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522 | that <<0x>> appears even for the NULL pointer. |
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523 | |||
4921 | Serge | 524 | o m |
525 | Prints the output of < |
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526 | argument is required. A GNU extension. |
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527 | |||
4349 | Serge | 528 | o- |
529 | O- |
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530 | |||
531 | <<_printf_r>>, <<_fprintf_r>>, <<_asprintf_r>>, |
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532 | <<_sprintf_r>>, <<_snprintf_r>>, <<_asnprintf_r>> are simply |
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533 | reentrant versions of the functions above. |
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534 | |||
535 | RETURNS |
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536 | On success, < |
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537 | the output string, except the concluding < |
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538 | < |
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539 | string, except the concluding < |
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540 | < |
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541 | < |
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542 | otherwise it returns an allocated string. |
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543 | |||
544 | If an error occurs, the result of < |
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545 | < |
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546 | < |
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547 | < |
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548 | < |
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549 | to ENOMEM if allocation fails, and for < |
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550 | set to EOVERFLOW if <[size]> or the output length exceeds INT_MAX. |
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551 | |||
552 | BUGS |
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553 | The ``''' (quote) flag does not work when locale's thousands_sep is not empty. |
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554 | |||
555 | PORTABILITY |
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556 | ANSI C requires < |
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557 | < |
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558 | |||
559 | The ANSI C standard specifies that implementations must support at |
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560 | least formatted output of up to 509 characters. This implementation |
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561 | has no inherent limit. |
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562 | |||
563 | Depending on how newlib was configured, not all format specifiers are |
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564 | supported. |
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565 | |||
566 | Supporting OS subroutines required: < |
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567 | < |
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568 | */ |
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569 | |||
570 | #include <_ansi.h> |
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571 | #include |
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572 | #include |
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573 | #ifdef _HAVE_STDC |
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574 | #include |
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575 | #else |
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576 | #include |
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577 | #endif |
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578 | #include |
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579 | #include "local.h" |
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580 | |||
581 | int |
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582 | #ifdef _HAVE_STDC |
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583 | _DEFUN(_sprintf_r, (ptr, str, fmt), |
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584 | struct _reent *ptr _AND |
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4921 | Serge | 585 | char *__restrict str _AND |
586 | _CONST char *__restrict fmt _DOTS) |
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4349 | Serge | 587 | #else |
588 | _sprintf_r(ptr, str, fmt, va_alist) |
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589 | struct _reent *ptr; |
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4921 | Serge | 590 | char *__restrict str; |
591 | _CONST char *__restrict fmt; |
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4349 | Serge | 592 | va_dcl |
593 | #endif |
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594 | { |
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595 | int ret; |
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596 | va_list ap; |
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597 | FILE f; |
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598 | |||
599 | f._flags = __SWR | __SSTR; |
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600 | f._bf._base = f._p = (unsigned char *) str; |
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601 | f._bf._size = f._w = INT_MAX; |
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602 | f._file = -1; /* No file. */ |
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603 | #ifdef _HAVE_STDC |
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604 | va_start (ap, fmt); |
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605 | #else |
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606 | va_start (ap); |
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607 | #endif |
||
608 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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609 | va_end (ap); |
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610 | *f._p = '\0'; /* terminate the string */ |
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611 | return (ret); |
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612 | } |
||
613 | |||
6099 | serge | 614 | #ifdef _NANO_FORMATTED_IO |
615 | int |
||
616 | _EXFUN(_siprintf_r, (struct _reent *, char *, const char *, ...) |
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617 | _ATTRIBUTE ((__alias__("_sprintf_r")))); |
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618 | #endif |
||
619 | |||
4349 | Serge | 620 | #ifndef _REENT_ONLY |
621 | |||
622 | int |
||
623 | #ifdef _HAVE_STDC |
||
624 | _DEFUN(sprintf, (str, fmt), |
||
4921 | Serge | 625 | char *__restrict str _AND |
626 | _CONST char *__restrict fmt _DOTS) |
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4349 | Serge | 627 | #else |
628 | sprintf(str, fmt, va_alist) |
||
629 | char *str; |
||
630 | _CONST char *fmt; |
||
631 | va_dcl |
||
632 | #endif |
||
633 | { |
||
634 | int ret; |
||
635 | va_list ap; |
||
636 | FILE f; |
||
637 | |||
638 | f._flags = __SWR | __SSTR; |
||
639 | f._bf._base = f._p = (unsigned char *) str; |
||
640 | f._bf._size = f._w = INT_MAX; |
||
641 | f._file = -1; /* No file. */ |
||
642 | #ifdef _HAVE_STDC |
||
643 | va_start (ap, fmt); |
||
644 | #else |
||
645 | va_start (ap); |
||
646 | #endif |
||
647 | ret = _svfprintf_r (_REENT, &f, fmt, ap); |
||
648 | va_end (ap); |
||
649 | *f._p = '\0'; /* terminate the string */ |
||
650 | return (ret); |
||
651 | } |
||
652 | |||
6099 | serge | 653 | #ifdef _NANO_FORMATTED_IO |
654 | int |
||
655 | _EXFUN(siprintf, (char *, const char *, ...) |
||
656 | _ATTRIBUTE ((__alias__("sprintf")))); |
||
4349 | Serge | 657 | #endif |
6099 | serge | 658 | #endif |