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974 | cejka | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * Copyright (C) 2006 Josef Cejka |
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4 | * All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * - Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * - Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * - The name of the author may not be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | #include <stdio.h> |
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31 | #include <unistd.h> |
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32 | #include <io/io.h> |
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33 | #include <stdarg.h> |
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34 | |||
35 | static char digits[] = "0123456789abcdef"; /**< Hexadecimal characters */ |
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36 | |||
37 | /** Print hexadecimal digits |
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38 | * |
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39 | * Print fixed count of hexadecimal digits from |
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40 | * the number num. The digits are printed in |
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41 | * natural left-to-right order starting with |
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42 | * the width-th digit. |
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43 | * |
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44 | * @param num Number containing digits. |
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45 | * @param width Count of digits to print. |
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46 | * |
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47 | */ |
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48 | static int print_fixed_hex(const uint64_t num, const int width) |
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49 | { |
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50 | int i; |
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51 | char buf[16]; |
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52 | char *bptr; |
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53 | |||
54 | bptr = buf; |
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55 | for (i = width*8 - 4; i >= 0; i -= 4) |
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56 | *bptr++ = digits[(num>>i) & 0xf]; |
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57 | *bptr = '\0'; |
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58 | |||
59 | return putstr(buf); |
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60 | } |
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61 | |||
62 | |||
63 | /** Print number in given base |
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64 | * |
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65 | * Print significant digits of a number in given |
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66 | * base. |
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67 | * |
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68 | * @param num Number to print. |
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69 | * @param base Base to print the number in (should |
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70 | * be in range 2 .. 16). |
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71 | * |
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72 | */ |
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73 | static int print_number(const unsigned int num, const unsigned int base) |
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74 | { |
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75 | int val = num; |
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76 | char d[sizeof(unsigned int)*8+1]; /* this is good enough even for base == 2 */ |
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77 | int i = sizeof(unsigned int)*8-1; |
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78 | |||
79 | do { |
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80 | d[i--] = digits[val % base]; |
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81 | } while (val /= base); |
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82 | |||
83 | d[sizeof(unsigned int)*8] = 0; |
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84 | |||
85 | return putstr(&d[i + 1]); |
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86 | } |
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87 | |||
88 | |||
89 | |||
90 | /** General formatted text print |
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91 | * |
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92 | * Print text formatted according the fmt parameter |
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93 | * and variant arguments. Each formatting directive |
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94 | * begins with \% (percentage) character and one of the |
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95 | * following character: |
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96 | * |
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97 | * \% Prints the percentage character. |
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98 | * |
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99 | * s The next variant argument is treated as char* |
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100 | * and printed as a NULL terminated string. |
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101 | * |
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102 | * c The next variant argument is treated as a single char. |
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103 | * |
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104 | * p The next variant argument is treated as a maximum |
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105 | * bit-width integer with respect to architecture |
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106 | * and printed in full hexadecimal width. |
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107 | * |
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108 | * P As with 'p', but '0x' is prefixed. |
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109 | * |
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110 | * q The next variant argument is treated as a 64b integer |
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111 | * and printed in full hexadecimal width. |
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112 | * |
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113 | * Q As with 'q', but '0x' is prefixed. |
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114 | * |
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115 | * l The next variant argument is treated as a 32b integer |
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116 | * and printed in full hexadecimal width. |
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117 | * |
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118 | * L As with 'l', but '0x' is prefixed. |
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119 | * |
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120 | * w The next variant argument is treated as a 16b integer |
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121 | * and printed in full hexadecimal width. |
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122 | * |
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123 | * W As with 'w', but '0x' is prefixed. |
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124 | * |
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125 | * b The next variant argument is treated as a 8b integer |
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126 | * and printed in full hexadecimal width. |
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127 | * |
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128 | * B As with 'b', but '0x' is prefixed. |
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129 | * |
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130 | * d The next variant argument is treated as integer |
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131 | * and printed in standard decimal format (only significant |
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132 | * digits). |
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133 | * |
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134 | * x The next variant argument is treated as integer |
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135 | * and printed in standard hexadecimal format (only significant |
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136 | * digits). |
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137 | * |
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138 | * X As with 'x', but '0x' is prefixed. |
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139 | * |
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140 | * All other characters from fmt except the formatting directives |
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141 | * are printed in verbatim. |
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142 | * |
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143 | * @param fmt Formatting NULL terminated string. |
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144 | */ |
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145 | int printf(const char *fmt, ...) |
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146 | { |
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147 | int i = 0, j = 0; |
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148 | int counter, retval; |
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149 | va_list ap; |
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150 | char c; |
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151 | |||
152 | counter = 0; |
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153 | va_start(ap, fmt); |
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154 | |||
155 | while ((c = fmt[i])) { |
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156 | /* control character */ |
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157 | if (c == '%' ) { |
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158 | /* print common characters if any processed */ |
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159 | if (i > j) { |
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160 | if ((retval = putnchars(&fmt[j], i - j)) == EOF) { /* error */ |
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161 | return -counter; |
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162 | } |
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163 | counter += retval; |
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164 | } |
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165 | |||
166 | j = ++i; |
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167 | |||
168 | switch (c = fmt[i]) { |
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169 | |||
170 | /* percentile itself */ |
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171 | case '%': |
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172 | --j; /* soon will be incremented back */ |
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173 | break; |
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174 | |||
175 | /* |
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176 | * String and character conversions. |
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177 | */ |
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178 | case 's': |
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179 | if ((retval = putstr(va_arg(ap, char*))) == EOF) { |
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180 | return -counter; |
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181 | }; |
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182 | |||
183 | counter += retval; |
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184 | break; |
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185 | case 'c': |
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186 | if ((retval = putnchars((char *)&va_arg(ap, int), sizeof(char))) == EOF) { |
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187 | return -counter; |
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188 | }; |
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189 | |||
190 | counter += retval; |
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191 | break; |
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192 | |||
193 | /* |
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194 | * Hexadecimal conversions with fixed width. |
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195 | */ |
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196 | case 'P': |
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197 | if ((retval = putnchars("0x", 2)) == EOF) { |
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198 | return -counter; |
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199 | }; |
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200 | |||
201 | counter += retval; |
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202 | case 'p': |
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203 | if ((retval = print_fixed_hex(va_arg(ap, int), sizeof(int))) == EOF ) { |
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204 | return -counter; |
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205 | }; |
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206 | |||
207 | counter += retval; |
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208 | break; |
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209 | case 'Q': |
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210 | if ((retval = putnchars("0x", 2)) == EOF) { |
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211 | return -counter; |
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212 | }; |
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213 | |||
214 | counter += retval; |
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215 | case 'q': |
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216 | if ((retval = print_fixed_hex(va_arg(ap, uint64_t), sizeof(uint64_t))) == EOF ) { |
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217 | return -counter; |
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218 | }; |
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219 | |||
220 | counter += retval; |
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221 | break; |
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222 | case 'L': |
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223 | if ((retval = putnchars("0x", 2)) == EOF) { |
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224 | return -counter; |
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225 | }; |
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226 | |||
227 | counter += retval; |
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228 | case 'l': |
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229 | if ((retval = print_fixed_hex(va_arg(ap, int), sizeof(uint32_t))) == EOF ) { |
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230 | return -counter; |
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231 | }; |
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232 | |||
233 | counter += retval; |
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234 | break; |
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235 | case 'W': |
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236 | if ((retval = putnchars("0x", 2)) == EOF) { |
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237 | return -counter; |
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238 | }; |
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239 | |||
240 | counter += retval; |
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241 | case 'w': |
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242 | if ((retval = print_fixed_hex(va_arg(ap, int), sizeof(uint16_t))) == EOF ) { |
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243 | return -counter; |
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244 | }; |
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245 | |||
246 | counter += retval; |
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247 | break; |
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248 | case 'B': |
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249 | if ((retval = putnchars("0x", 2)) == EOF) { |
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250 | return -counter; |
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251 | }; |
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252 | |||
253 | counter += retval; |
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254 | case 'b': |
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255 | if ((retval = print_fixed_hex(va_arg(ap, int), sizeof(uint8_t))) == EOF ) { |
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256 | return -counter; |
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257 | }; |
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258 | |||
259 | counter += retval; |
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260 | break; |
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261 | /* |
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262 | * Decimal and hexadecimal conversions. |
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263 | */ |
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264 | case 'd': |
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265 | if ((retval = print_number(va_arg(ap, int), 10)) == EOF ) { |
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266 | return -counter; |
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267 | }; |
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268 | |||
269 | counter += retval; |
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270 | break; |
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271 | case 'X': |
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272 | if ((retval = putnchars("0x", 2)) == EOF) { |
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273 | return -counter; |
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274 | }; |
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275 | |||
276 | counter += retval; |
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277 | case 'x': |
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278 | if ((retval = print_number(va_arg(ap, int), 16)) == EOF ) { |
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279 | return -counter; |
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280 | }; |
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281 | |||
282 | counter += retval; |
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283 | break; |
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284 | /* |
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285 | * Bad formatting. |
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286 | */ |
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287 | default: |
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288 | return -counter; |
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289 | } |
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290 | ++j; |
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291 | } |
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292 | ++i; |
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293 | } |
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294 | |||
295 | va_end(ap); |
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296 | return counter; |
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297 | } |
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298 |