137 lines
2.8 KiB
C
137 lines
2.8 KiB
C
/* Copyright (C) 2016 Jeremiah Orians
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* This file is part of M2-Planet.
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*
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* M2-Planet is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* M2-Planet is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
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*/
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// CONSTANT stdin 0
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// CONSTANT stdout 1
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// CONSTANT stderr 2
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// CONSTANT EOF 0xFFFFFFFF
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int fgetc(FILE* f)
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{
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asm("LOAD_EFFECTIVE_ADDRESS_rdi %8"
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"LOAD_INTEGER_rdi"
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"LOAD_IMMEDIATE_rax %0"
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"PUSH_RAX"
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"LOAD_EFFECTIVE_ADDRESS_rsi %0"
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"LOAD_IMMEDIATE_rdx %1"
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"SYSCALL"
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"LOAD_IMMEDIATE_rbx %0"
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"CMP"
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"POP_RAX"
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"JUMP_NE %FUNCTION_fgetc_Done"
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"LOAD_IMMEDIATE_rax %-1"
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":FUNCTION_fgetc_Done");
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}
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void fputc(char s, FILE* f)
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{
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asm("LOAD_IMMEDIATE_rax %1"
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"LOAD_EFFECTIVE_ADDRESS_rdi %8"
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"LOAD_INTEGER_rdi"
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"LOAD_EFFECTIVE_ADDRESS_rsi %16"
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"LOAD_IMMEDIATE_rdx %1"
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"SYSCALL");
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}
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/* Important values needed for open */
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// CONSTANT O_RDONLY 0
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// CONSTANT O_WRONLY 1
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// CONSTANT O_RDWR 2
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// CONSTANT O_CREAT 64
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// CONSTANT O_TRUNC 512
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/* 00700 in octal is 448*/
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// CONSTANT S_IRWXU 448
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/* 00100 in octal is 64 */
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// CONSTANT S_IXUSR 64
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/* 00200 in octal is 128 */
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// CONSTANT S_IWUSR 128
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/* 00400 in octal is 256 */
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// CONSTANT S_IRUSR 256
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FILE* open(char* name, int flag, int mode)
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{
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asm("LOAD_EFFECTIVE_ADDRESS_rdi %24"
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"LOAD_INTEGER_rdi"
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"LOAD_EFFECTIVE_ADDRESS_rsi %16"
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"LOAD_INTEGER_rsi"
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"LOAD_EFFECTIVE_ADDRESS_rdx %8"
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"LOAD_INTEGER_rdx"
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"LOAD_IMMEDIATE_rax %2"
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"SYSCALL");
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}
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FILE* fopen(char* filename, char* mode)
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{
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FILE* f;
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if('w' == mode[0])
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{ /* 577 is O_WRONLY|O_CREAT|O_TRUNC, 384 is 600 in octal */
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f = open(filename, 577 , 384);
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}
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else
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{ /* Everything else is a read */
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f = open(filename, 0, 0);
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}
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/* Negative numbers are error codes */
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if(0 > f)
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{
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return 0;
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}
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return f;
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}
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int close(int fd)
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{
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asm("LOAD_EFFECTIVE_ADDRESS_rdi %8"
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"LOAD_INTEGER_rdi"
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"LOAD_IMMEDIATE_rax %3"
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"SYSCALL");
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}
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int fclose(FILE* stream)
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{
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int error = close(stream);
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return error;
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}
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int fflush(FILE *stream){
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/* We don't buffer, nothing to flush */
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return 0;
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}
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// CONSTANT SEEK_SET 0
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// CONSTANT SEEK_CUR 1
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// CONSTANT SEEK_END 2
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int fseek(FILE* f, long offset, int whence)
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{
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/* Uses lseek directly */
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asm("LOAD_EFFECTIVE_ADDRESS_rdi %24"
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"LOAD_INTEGER_rdi"
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"LOAD_EFFECTIVE_ADDRESS_rsi %16"
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"LOAD_INTEGER_rsi"
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"LOAD_EFFECTIVE_ADDRESS_rdx %8"
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"LOAD_INTEGER_rdx"
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"LOAD_IMMEDIATE_rax %8"
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"SYSCALL");
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}
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void rewind(FILE* f)
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{
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fseek(f, 0, SEEK_SET);
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}
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