1 | /* |
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2 | * stdio.c - User level <stdio> library implementation. |
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3 | * |
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4 | * Author Alain Greiner (2016,2017,2018) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <stdio.h> |
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25 | #include <stdarg.h> |
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26 | #include <almosmkh.h> |
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27 | #include <unistd.h> |
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28 | |
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29 | ////////////////////////////////////////// |
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30 | static int xprintf( char * string, |
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31 | unsigned int length, |
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32 | const char * format, |
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33 | va_list * args ) |
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34 | { |
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35 | unsigned int ps = 0; // write index to the string buffer |
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36 | |
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37 | #define TO_STREAM(x) do { string[ps] = (x); ps++; if(ps==length) return -1; } while(0); |
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38 | |
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39 | xprintf_text: |
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40 | |
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41 | while ( *format != 0 ) |
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42 | { |
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43 | |
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44 | if (*format == '%') // copy argument to string |
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45 | { |
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46 | format++; |
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47 | goto xprintf_arguments; |
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48 | } |
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49 | else // copy one char to string |
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50 | { |
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51 | TO_STREAM( *format ); |
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52 | format++; |
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53 | } |
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54 | } |
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55 | |
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56 | return ps; |
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57 | |
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58 | xprintf_arguments: |
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59 | |
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60 | { |
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61 | char buf[30]; // buffer to display one number |
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62 | char * pbuf; // pointer on first char to display |
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63 | unsigned int len = 0; // number of char to display |
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64 | static const char HexaTab[] = "0123456789ABCDEF"; |
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65 | unsigned int i; |
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66 | |
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67 | // Ignore fields width and precision |
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68 | for ( ; (*format >= '0' && *format <= '9') || (*format == '.') ; format++ ); |
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69 | |
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70 | switch (*format) |
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71 | { |
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72 | case ('c'): // char conversion |
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73 | { |
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74 | int val = va_arg( *args, int ); |
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75 | buf[0] = val; |
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76 | pbuf = buf; |
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77 | len = 1; |
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78 | break; |
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79 | } |
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80 | case ('d'): // decimal signed integer |
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81 | { |
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82 | int val = va_arg( *args, int ); |
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83 | if (val < 0) |
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84 | { |
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85 | TO_STREAM( '-' ); |
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86 | val = -val; |
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87 | } |
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88 | for(i = 0; i < 10; i++) |
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89 | { |
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90 | |
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91 | buf[9 - i] = HexaTab[val % 10]; |
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92 | if (!(val /= 10)) break; |
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93 | } |
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94 | len = i + 1; |
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95 | pbuf = &buf[9 - i]; |
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96 | break; |
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97 | } |
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98 | case ('u'): // decimal unsigned integer |
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99 | { |
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100 | unsigned int val = va_arg( *args, unsigned int ); |
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101 | for(i = 0; i < 10; i++) |
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102 | { |
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103 | buf[9 - i] = HexaTab[val % 10]; |
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104 | if (!(val /= 10)) break; |
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105 | } |
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106 | len = i + 1; |
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107 | pbuf = &buf[9 - i]; |
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108 | break; |
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109 | } |
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110 | case ('x'): // 32 bits hexadecimal |
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111 | case ('l'): // 64 bits hexadecimal |
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112 | { |
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113 | unsigned int imax; |
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114 | unsigned long long val; |
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115 | |
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116 | if ( *format == 'l' ) // 64 bits |
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117 | { |
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118 | val = va_arg( *args, unsigned long long); |
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119 | imax = 16; |
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120 | } |
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121 | else // 32 bits |
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122 | { |
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123 | val = va_arg( *args, unsigned int); |
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124 | imax = 8; |
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125 | } |
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126 | |
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127 | TO_STREAM( '0' ); |
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128 | TO_STREAM( 'x' ); |
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129 | |
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130 | for(i = 0; i < imax; i++) |
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131 | { |
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132 | buf[(imax-1) - i] = HexaTab[val % 16]; |
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133 | if (!(val /= 16)) break; |
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134 | } |
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135 | len = i + 1; |
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136 | pbuf = &buf[(imax-1) - i]; |
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137 | break; |
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138 | } |
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139 | case ('s'): /* string */ |
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140 | { |
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141 | char* str = va_arg( *args, char* ); |
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142 | while (str[len]) { len++; } |
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143 | pbuf = str; |
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144 | break; |
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145 | } |
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146 | /* |
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147 | case ('f'): // IEEE754 64 bits |
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148 | // integer part : up to 10 decimal digits |
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149 | // decimal part : 9 decimal digits |
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150 | { |
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151 | union |
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152 | { |
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153 | double d; |
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154 | unsigned long long ull; |
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155 | } val; |
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156 | |
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157 | val.d = va_arg( *args, double ); |
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158 | |
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159 | unsigned long long mantisse; |
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160 | mantisse = val.ull & 0xFFFFFFFFFFFFFULL; // mantisse |
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161 | |
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162 | unsigned int exp; |
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163 | exp = (unsigned int)((val.ull & 0x7FF0000000000000ULL) >> 52); // exp |
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164 | |
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165 | if (exp == 0x7FF) // special values |
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166 | { |
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167 | if (mantisse & 0xFFFFFFFFFFFFFULL) // Not a Number |
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168 | { |
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169 | buf[0] = 'N'; |
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170 | buf[1] = 'a'; |
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171 | buf[2] = 'N'; |
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172 | len = 3; |
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173 | pbuf = buf; |
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174 | } |
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175 | else // infinite |
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176 | { |
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177 | // inf |
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178 | buf[0] = (val.ull & 0x8000000000000000ULL) ? '-' : '+'; |
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179 | buf[1] = 'i'; |
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180 | buf[2] = 'n'; |
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181 | buf[3] = 'f'; |
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182 | len = 4; |
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183 | pbuf = buf; |
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184 | } |
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185 | break; |
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186 | } |
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187 | |
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188 | // display sign & analyse overflow |
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189 | unsigned int overflow = 0; |
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190 | if (val.ull & 0x8000000000000000ULL) // negative |
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191 | { |
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192 | TO_STREAM( '-' ); |
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193 | val.d = val.d * -1; |
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194 | if( val.d < -9999999999.0) overflow = 1; |
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195 | } |
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196 | else // positive |
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197 | { |
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198 | TO_STREAM( '+' ); |
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199 | if( val.d > 9999999999.0) overflow = 1; |
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200 | } |
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201 | |
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202 | // check overflow caused by the 10.9 format |
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203 | if ( overflow ) |
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204 | { |
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205 | buf[0] = 'o'; |
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206 | buf[1] = 'v'; |
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207 | buf[2] = 'r'; |
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208 | len = 3; |
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209 | pbuf = buf; |
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210 | break; |
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211 | } |
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212 | |
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213 | // compute integer & decimal parts |
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214 | unsigned int intp; // integer part |
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215 | unsigned int decp; // decimal part |
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216 | intp = (unsigned int)val.d; |
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217 | val.d -= (double)intp; |
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218 | decp = (unsigned int)(val.d * 1000000000); |
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219 | |
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220 | // display decimal value in 10.9 format |
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221 | for(i = 0; i < 10; i++) |
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222 | { |
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223 | buf[9 - i] = HexaTab[intp % 10]; |
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224 | if (!(intp /= 10)) break; |
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225 | } |
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226 | pbuf = &buf[9 - i]; |
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227 | len = i+11; |
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228 | buf[10] = '.'; |
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229 | for(i = 0; i < 9; i++) |
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230 | { |
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231 | buf[19 - i] = HexaTab[decp % 10]; |
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232 | decp /= 10; |
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233 | } |
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234 | break; |
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235 | } |
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236 | */ |
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237 | default: // unsupported argument type |
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238 | { |
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239 | return -1; |
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240 | } |
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241 | } // end switch on argument type |
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242 | |
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243 | format++; |
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244 | |
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245 | // copy argument to string |
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246 | for( i = 0 ; i < len ; i++ ) |
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247 | { |
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248 | TO_STREAM( pbuf[i] ); |
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249 | } |
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250 | |
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251 | goto xprintf_text; |
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252 | } |
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253 | } // end xprintf() |
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254 | |
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255 | ////////////////////////////////////// |
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256 | int printf( const char * format, ... ) |
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257 | { |
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258 | char string[4096]; |
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259 | va_list args; |
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260 | int count; |
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261 | |
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262 | va_start( args, format ); |
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263 | count = xprintf( string , 4095 , format , &args ); |
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264 | va_end( args ); |
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265 | |
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266 | if ( count == -1 ) |
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267 | { |
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268 | display_string( "printf : xprintf failure" ); |
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269 | return -1; |
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270 | } |
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271 | else |
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272 | { |
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273 | string[count] = 0; |
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274 | return write( 1 , &string , count ); |
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275 | } |
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276 | } |
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277 | |
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278 | ///////////// |
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279 | int getchar() |
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280 | { |
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281 | char byte; |
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282 | |
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283 | if ( read( 0 , &byte , 1 ) != 1 ) return 0; |
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284 | else return (int)byte; |
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285 | } |
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286 | |
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287 | //////////////////// |
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288 | int putchar( int c ) |
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289 | { |
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290 | char byte = (char)c; |
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291 | |
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292 | if( write( 1 , &byte , 1 ) != 1 ) return 0; |
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293 | else return c; |
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294 | } |
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295 | |
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296 | /////////////////////////////////////// |
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297 | int snprintf( char * string, |
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298 | unsigned int length, |
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299 | const char * format, ... ) |
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300 | { |
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301 | va_list args; |
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302 | int count; |
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303 | |
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304 | va_start( args, format ); |
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305 | count = xprintf( string , length , format , &args ); |
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306 | va_end( args ); |
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307 | |
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308 | if( count < length ) string[count] = 0; |
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309 | |
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310 | return count; |
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311 | } |
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312 | |
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313 | |
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314 | |
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315 | |
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316 | |
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