[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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[610] | 25 | #include <hal_shared_types.h> |
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| 26 | #include <hal_user.h> |
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| 27 | #include <syscalls_numbers.h> |
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[444] | 28 | #include <stdarg.h> |
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[445] | 29 | #include <almosmkh.h> |
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[444] | 30 | #include <unistd.h> |
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[459] | 31 | #include <fcntl.h> |
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[445] | 32 | |
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[459] | 33 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 34 | // stdio library global variables |
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| 35 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 36 | |
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[677] | 37 | // This user space array registers all FILE descriptors that can be simultaneously |
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| 38 | // open by a given process. The structure FILE is defined in the <stdio.h> file. |
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[459] | 39 | |
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[677] | 40 | FILE open_file_array[MAX_OPEN_FILE_PER_PROCESS]; |
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| 41 | |
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[459] | 42 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 43 | // stdio library functions |
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| 44 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 45 | |
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[610] | 46 | ///////////////////////////// |
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| 47 | int rename( const char * old, |
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| 48 | const char * new ) |
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| 49 | { |
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| 50 | return hal_user_syscall( SYS_RENAME, |
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| 51 | (reg_t)old, |
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| 52 | (reg_t)new, 0, 0 ); |
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| 53 | } |
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| 54 | |
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[628] | 55 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 56 | // This static function analyses the <format> and the <args> to build a formated |
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| 57 | // string in the buffer defined by <string> and <length>. |
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| 58 | // It does NOT add a terminating NUL character in the <string buffer>. |
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| 59 | // If success, it returns the number of bytes actually copied in the string buffer. |
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| 60 | // It returns -1 in case of illegal format, or if the formated string exceeds the |
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| 61 | // the length argument. |
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| 62 | //////////////////////////////////////////////////////////////////////////////////////// |
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[624] | 63 | static int xprintf( char * string, |
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| 64 | int length, |
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| 65 | const char * format, |
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| 66 | va_list * args ) |
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[444] | 67 | { |
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[628] | 68 | int ps = 0; // index in the string buffer |
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[439] | 69 | |
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[624] | 70 | #define TO_STREAM(x) do { string[ps] = (x); ps++; if(ps==length) return -1; } while(0); |
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[439] | 71 | |
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[444] | 72 | xprintf_text: |
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[439] | 73 | |
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[444] | 74 | while ( *format != 0 ) |
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| 75 | { |
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[439] | 76 | |
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[444] | 77 | if (*format == '%') // copy argument to string |
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| 78 | { |
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| 79 | format++; |
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| 80 | goto xprintf_arguments; |
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| 81 | } |
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| 82 | else // copy one char to string |
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| 83 | { |
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| 84 | TO_STREAM( *format ); |
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| 85 | format++; |
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| 86 | } |
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| 87 | } |
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[439] | 88 | |
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[444] | 89 | return ps; |
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[439] | 90 | |
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[444] | 91 | xprintf_arguments: |
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[439] | 92 | |
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[444] | 93 | { |
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[628] | 94 | char buf[30]; // buffer to store the string for one number |
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[444] | 95 | char * pbuf; // pointer on first char to display |
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| 96 | unsigned int len = 0; // number of char to display |
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| 97 | static const char HexaTab[] = "0123456789ABCDEF"; |
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| 98 | unsigned int i; |
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| 99 | |
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| 100 | // Ignore fields width and precision |
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| 101 | for ( ; (*format >= '0' && *format <= '9') || (*format == '.') ; format++ ); |
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[439] | 102 | |
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[444] | 103 | switch (*format) |
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| 104 | { |
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| 105 | case ('c'): // char conversion |
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| 106 | { |
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| 107 | int val = va_arg( *args, int ); |
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| 108 | buf[0] = val; |
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| 109 | pbuf = buf; |
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| 110 | len = 1; |
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| 111 | break; |
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| 112 | } |
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| 113 | case ('d'): // decimal signed integer |
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| 114 | { |
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| 115 | int val = va_arg( *args, int ); |
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| 116 | if (val < 0) |
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| 117 | { |
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| 118 | TO_STREAM( '-' ); |
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| 119 | val = -val; |
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| 120 | } |
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| 121 | for(i = 0; i < 10; i++) |
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| 122 | { |
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[439] | 123 | |
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[444] | 124 | buf[9 - i] = HexaTab[val % 10]; |
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| 125 | if (!(val /= 10)) break; |
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| 126 | } |
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| 127 | len = i + 1; |
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| 128 | pbuf = &buf[9 - i]; |
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| 129 | break; |
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| 130 | } |
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| 131 | case ('u'): // decimal unsigned integer |
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| 132 | { |
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| 133 | unsigned int val = va_arg( *args, unsigned int ); |
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| 134 | for(i = 0; i < 10; i++) |
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| 135 | { |
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| 136 | buf[9 - i] = HexaTab[val % 10]; |
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| 137 | if (!(val /= 10)) break; |
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| 138 | } |
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| 139 | len = i + 1; |
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| 140 | pbuf = &buf[9 - i]; |
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| 141 | break; |
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| 142 | } |
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[677] | 143 | case ('x'): // up to 8 digits hexa after "0x" |
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| 144 | case ('X'): // exactly 8 digits hexa after "0x" |
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[444] | 145 | { |
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[677] | 146 | unsigned int val = va_arg( *args , unsigned int ); |
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| 147 | TO_STREAM( '0' ); |
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| 148 | TO_STREAM( 'x' ); |
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| 149 | for(i = 0 ; i < 8 ; i++) |
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[444] | 150 | { |
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[677] | 151 | buf[7 - i] = HexaTab[val & 0xF]; |
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| 152 | if( (*format == 'x') && ((val >> 4) == 0) ) break; |
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| 153 | val = val >> 4; |
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[444] | 154 | } |
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[677] | 155 | len = i + 1; |
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| 156 | pbuf = &buf[7 - i]; |
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| 157 | break; |
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| 158 | } |
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| 159 | case ('l'): // up to 16 digits hexa after "0x" |
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| 160 | case ('L'): // exactly 16 digits hexa after "0x" |
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| 161 | { |
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| 162 | unsigned long long val = ((unsigned long long)va_arg( *args, unsigned int)) | |
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| 163 | ((unsigned long long)va_arg( *args, unsigned int) << 32); |
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[444] | 164 | TO_STREAM( '0' ); |
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| 165 | TO_STREAM( 'x' ); |
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[677] | 166 | for(i = 0 ; i < 16 ; i++) |
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[444] | 167 | { |
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[677] | 168 | buf[15 - i] = HexaTab[val & 0xF]; |
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| 169 | if( (*format == 'l') && ((val >> 4) == 0) ) break; |
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| 170 | val = val >> 4; |
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[444] | 171 | } |
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| 172 | len = i + 1; |
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[677] | 173 | pbuf = &buf[15 - i]; |
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[444] | 174 | break; |
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| 175 | } |
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| 176 | case ('s'): /* string */ |
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| 177 | { |
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[677] | 178 | char * str = va_arg( *args , char* ); |
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[444] | 179 | while (str[len]) { len++; } |
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| 180 | pbuf = str; |
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| 181 | break; |
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| 182 | } |
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| 183 | case ('f'): // IEEE754 64 bits |
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| 184 | // integer part : up to 10 decimal digits |
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| 185 | // decimal part : 9 decimal digits |
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| 186 | { |
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| 187 | union |
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| 188 | { |
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| 189 | double d; |
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| 190 | unsigned long long ull; |
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| 191 | } val; |
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| 192 | |
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| 193 | val.d = va_arg( *args, double ); |
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| 194 | |
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| 195 | unsigned long long mantisse; |
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| 196 | mantisse = val.ull & 0xFFFFFFFFFFFFFULL; // mantisse |
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| 197 | |
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| 198 | unsigned int exp; |
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| 199 | exp = (unsigned int)((val.ull & 0x7FF0000000000000ULL) >> 52); // exp |
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[439] | 200 | |
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[444] | 201 | if (exp == 0x7FF) // special values |
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| 202 | { |
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| 203 | if (mantisse & 0xFFFFFFFFFFFFFULL) // Not a Number |
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| 204 | { |
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| 205 | buf[0] = 'N'; |
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| 206 | buf[1] = 'a'; |
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| 207 | buf[2] = 'N'; |
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| 208 | len = 3; |
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| 209 | pbuf = buf; |
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| 210 | } |
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| 211 | else // infinite |
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| 212 | { |
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| 213 | // inf |
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| 214 | buf[0] = (val.ull & 0x8000000000000000ULL) ? '-' : '+'; |
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| 215 | buf[1] = 'i'; |
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| 216 | buf[2] = 'n'; |
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| 217 | buf[3] = 'f'; |
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| 218 | len = 4; |
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| 219 | pbuf = buf; |
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| 220 | } |
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| 221 | break; |
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| 222 | } |
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[439] | 223 | |
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[444] | 224 | // display sign & analyse overflow |
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| 225 | unsigned int overflow = 0; |
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| 226 | if (val.ull & 0x8000000000000000ULL) // negative |
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| 227 | { |
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| 228 | TO_STREAM( '-' ); |
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| 229 | val.d = val.d * -1; |
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| 230 | if( val.d < -9999999999.0) overflow = 1; |
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| 231 | } |
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| 232 | else // positive |
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| 233 | { |
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| 234 | TO_STREAM( '+' ); |
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| 235 | if( val.d > 9999999999.0) overflow = 1; |
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| 236 | } |
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| 237 | |
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| 238 | // check overflow caused by the 10.9 format |
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| 239 | if ( overflow ) |
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| 240 | { |
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| 241 | buf[0] = 'o'; |
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| 242 | buf[1] = 'v'; |
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| 243 | buf[2] = 'r'; |
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| 244 | len = 3; |
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| 245 | pbuf = buf; |
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| 246 | break; |
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| 247 | } |
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[439] | 248 | |
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[444] | 249 | // compute integer & decimal parts |
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| 250 | unsigned int intp; // integer part |
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| 251 | unsigned int decp; // decimal part |
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| 252 | intp = (unsigned int)val.d; |
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| 253 | val.d -= (double)intp; |
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| 254 | decp = (unsigned int)(val.d * 1000000000); |
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| 255 | |
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| 256 | // display decimal value in 10.9 format |
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| 257 | for(i = 0; i < 10; i++) |
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| 258 | { |
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| 259 | buf[9 - i] = HexaTab[intp % 10]; |
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| 260 | if (!(intp /= 10)) break; |
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| 261 | } |
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| 262 | pbuf = &buf[9 - i]; |
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| 263 | len = i+11; |
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| 264 | buf[10] = '.'; |
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| 265 | for(i = 0; i < 9; i++) |
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| 266 | { |
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| 267 | buf[19 - i] = HexaTab[decp % 10]; |
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| 268 | decp /= 10; |
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| 269 | } |
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| 270 | break; |
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| 271 | } |
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| 272 | default: // unsupported argument type |
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| 273 | { |
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[624] | 274 | return -1; |
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[444] | 275 | } |
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| 276 | } // end switch on argument type |
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[439] | 277 | |
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[444] | 278 | format++; |
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[439] | 279 | |
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[677] | 280 | // copy argument sub-string to the string buffer |
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[444] | 281 | for( i = 0 ; i < len ; i++ ) |
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| 282 | { |
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| 283 | TO_STREAM( pbuf[i] ); |
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| 284 | } |
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| 285 | |
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| 286 | goto xprintf_text; |
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| 287 | } |
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| 288 | } // end xprintf() |
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[439] | 289 | |
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| 290 | ////////////////////////////////////// |
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[444] | 291 | int printf( const char * format, ... ) |
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[439] | 292 | { |
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[677] | 293 | char string[4096]; |
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| 294 | va_list args; |
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| 295 | int count; |
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[444] | 296 | |
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| 297 | va_start( args, format ); |
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| 298 | count = xprintf( string , 4095 , format , &args ); |
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| 299 | va_end( args ); |
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[439] | 300 | |
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[677] | 301 | if ( count < 0 ) |
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[444] | 302 | { |
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[457] | 303 | display_string( "printf : xprintf failure" ); |
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[444] | 304 | return -1; |
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| 305 | } |
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| 306 | else |
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| 307 | { |
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| 308 | string[count] = 0; |
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[459] | 309 | |
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[457] | 310 | return write( 1 , &string , count ); |
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[444] | 311 | } |
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[459] | 312 | } // end printf() |
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[439] | 313 | |
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[580] | 314 | /////////////////// |
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[476] | 315 | int getchar( void ) |
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[439] | 316 | { |
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[444] | 317 | char byte; |
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[439] | 318 | |
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[444] | 319 | if ( read( 0 , &byte , 1 ) != 1 ) return 0; |
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| 320 | else return (int)byte; |
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[439] | 321 | } |
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| 322 | |
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[444] | 323 | //////////////////// |
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| 324 | int putchar( int c ) |
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[439] | 325 | { |
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[444] | 326 | char byte = (char)c; |
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[439] | 327 | |
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[444] | 328 | if( write( 1 , &byte , 1 ) != 1 ) return 0; |
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| 329 | else return c; |
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[439] | 330 | } |
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| 331 | |
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| 332 | /////////////////////////////////////// |
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[444] | 333 | int snprintf( char * string, |
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| 334 | unsigned int length, |
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| 335 | const char * format, ... ) |
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[439] | 336 | { |
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[677] | 337 | va_list args; |
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| 338 | int count; |
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[439] | 339 | |
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[444] | 340 | va_start( args, format ); |
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[624] | 341 | count = xprintf( string , (int)length , format , &args ); |
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[444] | 342 | va_end( args ); |
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[439] | 343 | |
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[677] | 344 | if( (count < 0) || (count == (int)length) ) // failure |
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| 345 | { |
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| 346 | return -1; |
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| 347 | } |
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| 348 | else // success |
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| 349 | { |
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| 350 | // add NUL character |
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| 351 | string[count] = 0; |
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[439] | 352 | |
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[677] | 353 | return count; |
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| 354 | } |
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[459] | 355 | } // end snprintf() |
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[439] | 356 | |
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[677] | 357 | |
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| 358 | |
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| 359 | |
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| 360 | |
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[459] | 361 | //////////////////////////////////// |
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| 362 | FILE * fopen( const char * pathname, |
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| 363 | const char * mode ) |
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| 364 | { |
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| 365 | //TODO handle the "mode" argument |
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| 366 | if( mode != NULL ) |
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| 367 | { |
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[623] | 368 | printf("\n[%s] error : the mode argument must be NULL\n", __FUNCTION__ ); |
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[459] | 369 | return NULL; |
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| 370 | } |
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[439] | 371 | |
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[459] | 372 | // get a file descriptor from kernel |
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| 373 | int fd = open( pathname, |
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| 374 | O_CREAT | O_RDWR, |
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| 375 | 0 ); |
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[439] | 376 | |
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[459] | 377 | if( fd < 0 ) |
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| 378 | { |
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[623] | 379 | printf("\n[%s] error : file <%s> not found\n", __FUNCTION__ , pathname ); |
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[459] | 380 | return NULL; |
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| 381 | } |
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| 382 | if( fd > MAX_OPEN_FILE_PER_PROCESS ) |
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| 383 | { |
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[623] | 384 | printf("\n[%s] error : not enough space for file <%s>\n", __FUNCTION__ , pathname ); |
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[459] | 385 | return NULL; |
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| 386 | } |
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[439] | 387 | |
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[459] | 388 | // register stream in open_file_array[] |
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| 389 | open_file_array[fd].fd = fd; |
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| 390 | open_file_array[fd].key = VALID_OPEN_FILE; |
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[439] | 391 | |
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[459] | 392 | return &open_file_array[fd]; |
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[623] | 393 | |
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[459] | 394 | } // end fopen() |
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| 395 | |
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| 396 | /////////////////////////// |
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| 397 | int fclose( FILE * stream ) |
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| 398 | { |
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| 399 | // check stream valid |
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| 400 | if( stream->key != VALID_OPEN_FILE ) return EOF; |
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| 401 | |
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| 402 | // get file descriptor from stream pointer |
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| 403 | int fd = stream->fd; |
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| 404 | |
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[623] | 405 | // remove stream from user open_file_array[] |
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[459] | 406 | open_file_array[fd].key = 0; |
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| 407 | |
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[623] | 408 | // close the kernel file descriptor |
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| 409 | if( close( fd ) ) |
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| 410 | { |
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| 411 | printf("\n[%s] error : cannot close file %d\n", __FUNCTION__ , fd ); |
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| 412 | return -1; |
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| 413 | } |
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| 414 | |
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| 415 | return 0; |
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| 416 | |
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[459] | 417 | } // end fclose() |
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| 418 | |
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[677] | 419 | ////////////////////////// |
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| 420 | int fgetc( FILE * stream ) |
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| 421 | { |
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| 422 | // check stream valid |
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| 423 | if( stream->key != VALID_OPEN_FILE ) return EOF; |
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| 424 | |
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| 425 | // get file descriptor from stream pointer |
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| 426 | int fd = stream->fd; |
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| 427 | |
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| 428 | char byte; |
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| 429 | |
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| 430 | if ( read( fd , &byte , 1 ) != 1 ) return 0; |
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| 431 | else return (int)byte; |
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| 432 | |
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| 433 | } |
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| 434 | |
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| 435 | ///////////////// |
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| 436 | int fputc( int c, |
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| 437 | FILE * stream) |
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| 438 | { |
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| 439 | // check stream valid |
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| 440 | if( stream->key != VALID_OPEN_FILE ) return EOF; |
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| 441 | |
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| 442 | // get file descriptor from stream pointer |
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| 443 | int fd = stream->fd; |
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| 444 | |
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| 445 | char byte = (char)c; |
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| 446 | |
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| 447 | if( write( fd , &byte , 1 ) != 1 ) return 0; |
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| 448 | else return c; |
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| 449 | |
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| 450 | } |
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| 451 | |
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[643] | 452 | ////////////////////////////////////////// |
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| 453 | unsigned int fread( void * buffer, |
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| 454 | unsigned int size, |
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| 455 | unsigned int nitems, |
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| 456 | FILE * stream ) |
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| 457 | { |
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| 458 | // check stream valid |
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| 459 | if( stream->key != VALID_OPEN_FILE ) return EOF; |
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| 460 | |
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| 461 | // get file descriptor from stream pointer |
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| 462 | int fd = stream->fd; |
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| 463 | |
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| 464 | // compute nbytes |
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[647] | 465 | int nbytes = size * nitems; |
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[643] | 466 | |
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| 467 | if( hal_user_syscall( SYS_READ, |
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| 468 | (reg_t)fd, |
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| 469 | (reg_t)buffer, |
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| 470 | (reg_t)nbytes, 0 ) == nbytes ) return nitems; |
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| 471 | else return 0; |
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| 472 | |
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| 473 | } // end fread() |
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| 474 | |
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| 475 | ////////////////////////////////////////// |
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| 476 | unsigned int fwrite( void * buffer, |
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| 477 | unsigned int size, |
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| 478 | unsigned int nitems, |
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| 479 | FILE * stream ) |
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| 480 | { |
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| 481 | // check stream valid |
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| 482 | if( stream->key != VALID_OPEN_FILE ) return EOF; |
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| 483 | |
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| 484 | // get file descriptor from stream pointer |
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| 485 | int fd = stream->fd; |
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| 486 | |
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| 487 | // compute nbytes |
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[647] | 488 | int nbytes = size * nitems; |
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[643] | 489 | |
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| 490 | if( hal_user_syscall( SYS_WRITE, |
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| 491 | (reg_t)fd, |
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| 492 | (reg_t)buffer, |
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| 493 | (reg_t)nbytes, 0 ) == nbytes ) return nitems; |
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| 494 | else return 0; |
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| 495 | |
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| 496 | } // end fwrite() |
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| 497 | |
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[647] | 498 | ////////////////////////////////////////// |
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| 499 | unsigned int fseek( FILE * stream, |
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| 500 | unsigned int offset, |
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| 501 | int whence ) |
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| 502 | { |
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| 503 | // check stream valid |
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| 504 | if( stream->key != VALID_OPEN_FILE ) return -1; |
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| 505 | |
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| 506 | // get file descriptor from stream pointer |
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| 507 | int fd = stream->fd; |
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| 508 | |
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| 509 | return( hal_user_syscall( SYS_LSEEK, |
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| 510 | (reg_t)fd, |
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| 511 | (reg_t)offset, |
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| 512 | (reg_t)whence, 0 ) ); |
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| 513 | } // end fseek() |
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| 514 | |
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[459] | 515 | ///////////////////////////////// |
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| 516 | int fprintf( FILE * stream, |
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| 517 | const char * format, ... ) |
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| 518 | { |
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[473] | 519 | char string[4096]; |
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| 520 | va_list args; |
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[624] | 521 | int count; |
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| 522 | int writen; |
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[473] | 523 | int fd; |
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[459] | 524 | |
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| 525 | // check stream valid |
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[625] | 526 | if( stream->key != VALID_OPEN_FILE ) |
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| 527 | { |
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| 528 | printf("\n[error in %s] stream %x non registered\n", __FUNCTION__, stream ); |
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| 529 | return -1; |
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| 530 | } |
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[459] | 531 | |
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| 532 | va_start( args, format ); |
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| 533 | count = xprintf( string , 4095 , format , &args ); |
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| 534 | va_end( args ); |
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| 535 | |
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[625] | 536 | // check format |
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[624] | 537 | if ( count < 0 ) |
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[459] | 538 | { |
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[625] | 539 | printf("\n[error in %s] unsupported format %s\n", __FUNCTION__, format ); |
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[459] | 540 | return -1; |
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| 541 | } |
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[623] | 542 | |
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[625] | 543 | // get file descriptor from file pointer |
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| 544 | fd = stream->fd; |
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[459] | 545 | |
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[625] | 546 | // set terminating NUL |
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| 547 | string[count] = 0; |
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[623] | 548 | |
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[625] | 549 | // copy string to file |
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| 550 | writen = write( fd , &string , count ); |
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[624] | 551 | |
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[625] | 552 | // check write |
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| 553 | if(writen != count ) |
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| 554 | { |
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| 555 | printf("\n[error in %s] cannot write to stream %s\n", __FUNCTION__, stream ); |
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| 556 | return -1; |
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| 557 | } |
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[624] | 558 | |
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[625] | 559 | return writen; |
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[624] | 560 | |
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[459] | 561 | } // end fprintf() |
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| 562 | |
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| 563 | |
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| 564 | |
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| 565 | |
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| 566 | |
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