1 /* Native functions for input/output. 2 3 Copyright (C) 2016, 2017 Paul Boddie <paul@boddie.org.uk> 4 5 This program is free software; you can redistribute it and/or modify it under 6 the terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3 of the License, or (at your option) any later 8 version. 9 10 This program is distributed in the hope that it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 13 details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include <unistd.h> /* read, write */ 20 #include <string.h> /* strcmp, memcpy */ 21 #include <stdio.h> /* fdopen, snprintf */ 22 #include <errno.h> /* errno */ 23 #include "native/common.h" 24 #include "types.h" 25 #include "exceptions.h" 26 #include "ops.h" 27 #include "progconsts.h" 28 #include "progops.h" 29 #include "progtypes.h" 30 #include "main.h" 31 32 /* Input/output. */ 33 34 __attr __fn_native_io_fclose(__attr __args[]) 35 { 36 __attr * const fp = &__args[1]; 37 /* fp interpreted as FILE reference */ 38 FILE *f = (FILE *) fp->datavalue; 39 40 errno = 0; 41 if (fclose(f)) 42 __raise_io_error(__new_int(errno)); 43 44 return __builtins___none_None; 45 } 46 47 __attr __fn_native_io_fflush(__attr __args[]) 48 { 49 __attr * const fp = &__args[1]; 50 /* fp interpreted as FILE reference */ 51 FILE *f = (FILE *) fp->datavalue; 52 53 errno = 0; 54 if (fflush(f)) 55 __raise_io_error(__new_int(errno)); 56 57 return __builtins___none_None; 58 } 59 60 __attr __fn_native_io_fopen(__attr __args[]) 61 { 62 __attr * const filename = &__args[1]; 63 __attr * const mode = &__args[2]; 64 /* filename.__data__ interpreted as string */ 65 char *fn = __load_via_object(filename->value, __data__).strvalue; 66 /* mode.__data__ interpreted as string */ 67 char *s = __load_via_object(mode->value, __data__).strvalue; 68 FILE *f; 69 __attr attr; 70 71 errno = 0; 72 f = fopen(fn, s); 73 74 /* Produce an exception if the operation failed. */ 75 76 if (f == NULL) 77 __raise_io_error(__new_int(errno)); 78 79 /* Return the __data__ attribute. */ 80 81 else 82 { 83 attr.datavalue = (void *) f; 84 return attr; 85 } 86 87 /* Should never be reached: included to satisfy the compiler. */ 88 89 return __builtins___none_None; 90 } 91 92 __attr __fn_native_io_fdopen(__attr __args[]) 93 { 94 __attr * const fd = &__args[1]; 95 __attr * const mode = &__args[2]; 96 /* fd.__data__ interpreted as int */ 97 int i = __load_via_object(fd->value, __data__).intvalue; 98 /* mode.__data__ interpreted as string */ 99 char *s = __load_via_object(mode->value, __data__).strvalue; 100 FILE *f; 101 __attr attr; 102 103 errno = 0; 104 f = fdopen(i, s); 105 106 /* Produce an exception if the operation failed. */ 107 108 if (f == NULL) 109 __raise_io_error(__new_int(errno)); 110 111 /* Return the __data__ attribute. */ 112 113 else 114 { 115 attr.datavalue = (void *) f; 116 return attr; 117 } 118 119 /* Should never be reached: included to satisfy the compiler. */ 120 121 return __builtins___none_None; 122 } 123 124 __attr __fn_native_io_fread(__attr __args[]) 125 { 126 __attr * const fp = &__args[1]; 127 __attr * const size = &__args[2]; 128 /* fp interpreted as FILE reference */ 129 FILE *f = (FILE *) fp->datavalue; 130 /* size.__data__ interpreted as int */ 131 int to_read = __load_via_object(size->value, __data__).intvalue; 132 char buf[to_read]; 133 size_t have_read; 134 int error; 135 char *s; 136 137 have_read = fread(buf, sizeof(char), to_read, f); 138 139 if (have_read != to_read) 140 { 141 if (feof(f) && (have_read == 0)) 142 __raise_eof_error(); 143 else if ((error = ferror(f))) 144 __raise_io_error(__new_int(error)); 145 } 146 147 /* Reserve space for a new string. */ 148 149 s = __ALLOCATE(have_read + 1, sizeof(char)); 150 memcpy(s, (char *) buf, have_read); /* does not null terminate but final byte should be zero */ 151 return __new_str(s, have_read); 152 } 153 154 __attr __fn_native_io_fwrite(__attr __args[]) 155 { 156 __attr * const fp = &__args[1]; 157 __attr * const str = &__args[2]; 158 /* fp interpreted as FILE reference */ 159 FILE *f = (FILE *) fp->datavalue; 160 /* str.__data__ interpreted as string */ 161 char *s = __load_via_object(str->value, __data__).strvalue; 162 /* str.__size__ interpreted as int */ 163 int to_write = __load_via_object(str->value, __size__).intvalue; 164 size_t have_written = fwrite(s, sizeof(char), to_write, f); 165 int error; 166 167 if (have_written != to_write) 168 { 169 if (feof(f)) 170 __raise_eof_error(); 171 else if ((error = ferror(f))) 172 __raise_io_error(__new_int(error)); 173 } 174 175 return __builtins___none_None; 176 } 177 178 __attr __fn_native_io_close(__attr __args[]) 179 { 180 __attr * const fd = &__args[1]; 181 /* fd.__data__ interpreted as int */ 182 int i = __load_via_object(fd->value, __data__).intvalue; 183 184 errno = 0; 185 if (close(i) == -1) 186 __raise_io_error(__new_int(errno)); 187 188 return __builtins___none_None; 189 } 190 191 __attr __fn_native_io_read(__attr __args[]) 192 { 193 __attr * const fd = &__args[1]; 194 __attr * const n = &__args[2]; 195 /* fd.__data__ interpreted as int */ 196 int i = __load_via_object(fd->value, __data__).intvalue; 197 /* n.__data__ interpreted as int */ 198 int to_read = __load_via_object(n->value, __data__).intvalue; 199 char buf[to_read]; 200 ssize_t have_read; 201 char *s; 202 203 errno = 0; 204 have_read = read(i, buf, to_read * sizeof(char)); 205 206 if (have_read == -1) 207 __raise_io_error(__new_int(errno)); 208 209 /* Reserve space for a new string. */ 210 211 s = __ALLOCATE(have_read + 1, 1); 212 memcpy(s, (char *) buf, have_read); /* does not null terminate but final byte should be zero */ 213 return __new_str(s, have_read); 214 } 215 216 __attr __fn_native_io_write(__attr __args[]) 217 { 218 __attr * const fd = &__args[1]; 219 __attr * const str = &__args[2]; 220 /* fd.__data__ interpreted as int */ 221 int i = __load_via_object(fd->value, __data__).intvalue; 222 /* str.__data__ interpreted as string */ 223 char *s = __load_via_object(str->value, __data__).strvalue; 224 /* str.__size__ interpreted as int */ 225 int size = __load_via_object(str->value, __size__).intvalue; 226 ssize_t have_written; 227 228 errno = 0; 229 have_written = write(i, s, sizeof(char) * size); 230 231 if (have_written == -1) 232 __raise_io_error(__new_int(errno)); 233 234 return __new_int(have_written); 235 } 236 237 /* Module initialisation. */ 238 239 void __main_native_io() 240 { 241 }