85 lines
1.7 KiB
C
85 lines
1.7 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 0x1100
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// CONSTANT stdout 0x1101
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// CONSTANT stderr 0
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// CONSTANT EOF 0xFFFFFFFF
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int match(char* a, char* b);
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int fgetc(FILE* f)
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{
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asm("LOAD R1 R14 0"
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"FGETC");
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}
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void fputc(char s, FILE* f)
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{
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asm("LOAD R0 R14 0"
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"LOAD R1 R14 4"
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"FPUTC");
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}
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FILE* open_read(int filename)
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{
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asm("LOAD R0 R14 0"
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"FOPEN_READ");
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}
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FILE* open_write(int filename)
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{
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asm("LOAD R0 R14 0"
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"FOPEN_WRITE");
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}
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int fclose(FILE* stream)
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{
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asm("LOAD R0 R14 0"
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"FCLOSE");
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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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int fd = 0;
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if(match(filename, "STDIN") || match(filename, "tape_01"))
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{
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fd = 0x1100;
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}
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else if(match(filename, "STDOUT") || match(filename, "tape_02"))
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{
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fd = 0x1101;
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}
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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_write(fd);
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}
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else
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{ /* Everything else is a read */
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f = open_read(fd);
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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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