[439] | 1 | /* |
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[445] | 2 | * stdio.c - User level <stdio> library implementation. |
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[439] | 3 | * |
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[445] | 4 | * Author Alain Greiner (2016,2017,2018) |
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[439] | 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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[444] | 25 | #include <stdarg.h> |
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[445] | 26 | #include <almosmkh.h> |
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[444] | 27 | #include <unistd.h> |
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[445] | 28 | |
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[444] | 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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[439] | 36 | |
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[444] | 37 | #define TO_STREAM(x) do { string[ps] = (x); ps++; if(ps==length) return -1; } while(0); |
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[439] | 38 | |
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[444] | 39 | xprintf_text: |
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[439] | 40 | |
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[444] | 41 | while ( *format != 0 ) |
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| 42 | { |
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[439] | 43 | |
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[444] | 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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[439] | 55 | |
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[444] | 56 | return ps; |
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[439] | 57 | |
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[444] | 58 | xprintf_arguments: |
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[439] | 59 | |
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[444] | 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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[439] | 69 | |
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[444] | 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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[439] | 90 | |
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[444] | 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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[439] | 164 | |
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[444] | 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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[439] | 187 | |
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[444] | 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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[439] | 212 | |
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[444] | 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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[439] | 242 | |
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[444] | 243 | format++; |
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[439] | 244 | |
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[444] | 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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[439] | 254 | |
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| 255 | ////////////////////////////////////// |
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[444] | 256 | int printf( const char * format, ... ) |
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[439] | 257 | { |
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[444] | 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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[439] | 265 | |
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[444] | 266 | if ( count == -1 ) |
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| 267 | { |
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[457] | 268 | display_string( "printf : xprintf failure" ); |
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[444] | 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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[457] | 274 | return write( 1 , &string , count ); |
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[444] | 275 | } |
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[439] | 276 | } |
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| 277 | |
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[444] | 278 | ///////////// |
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| 279 | int getchar() |
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[439] | 280 | { |
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[444] | 281 | char byte; |
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[439] | 282 | |
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[444] | 283 | if ( read( 0 , &byte , 1 ) != 1 ) return 0; |
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| 284 | else return (int)byte; |
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[439] | 285 | } |
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| 286 | |
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[444] | 287 | //////////////////// |
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| 288 | int putchar( int c ) |
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[439] | 289 | { |
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[444] | 290 | char byte = (char)c; |
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[439] | 291 | |
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[444] | 292 | if( write( 1 , &byte , 1 ) != 1 ) return 0; |
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| 293 | else return c; |
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[439] | 294 | } |
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| 295 | |
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| 296 | /////////////////////////////////////// |
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[444] | 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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[439] | 300 | { |
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[444] | 301 | va_list args; |
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| 302 | int count; |
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[439] | 303 | |
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[444] | 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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[439] | 307 | |
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[444] | 308 | if( count < length ) string[count] = 0; |
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[439] | 309 | |
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[444] | 310 | return count; |
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[439] | 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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