89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
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* NRJ (NOR and Reference Jump) OISC ANSI C emulator by Luxferre
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* Public domain
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* Build with: cc -Os -o nrj nrj.c
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <termios.h>
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#include <unistd.h>
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#include <sys/select.h>
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#ifndef NRJWORD
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#define NRJWORD unsigned short
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#endif
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#define NRJWSIZE (sizeof(NRJWORD))
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#define NRJSIZE (1 << NRJWSIZE)
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#define MAXADDR ((NRJWORD) (NRJSIZE - 1))
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int kbhit() {
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struct timeval tv = { 0L, 0L };
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(0, &fds);
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return select(1, &fds, NULL, NULL, &tv) > 0;
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}
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struct termios tty_opts_backup, tty_opts_raw;
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void restore_term() {
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tcsetattr(STDIN_FILENO, TCSANOW, &tty_opts_backup);
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}
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void nrj_in(NRJWORD *ctxid, NRJWORD *val) {
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unsigned char c;
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if(*ctxid == (NRJWORD) 0) { /* for now, only emulate standard context id */
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*val = (NRJWORD) 0;
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if(kbhit()) {
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if(read(0, &c, 1) > -1)
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*val = (NRJWORD) c;
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}
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}
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}
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void nrj_out(NRJWORD *ctxid, NRJWORD *val) {
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if(*ctxid == (NRJWORD) 0) /* for now, only emulate standard context id */
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putchar((unsigned char) *val);
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}
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void nrj_run(NRJWORD *mem, NRJWORD pc) { /* 0 - input, 1 - output, 2 - I/O context, 3 - program start */
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while(pc != MAXADDR) {
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if(mem[0]) nrj_in(&mem[2], &mem[mem[0]]);
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mem[mem[pc]] = (~(mem[mem[pc]] | mem[mem[pc+1]])) & MAXADDR;
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pc = mem[mem[pc+2]];
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mem[0] = (NRJWORD) 0;
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if(mem[1]) {
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nrj_out(&mem[2], &mem[mem[1]]);
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mem[1] = (NRJWORD) 0;
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}
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}
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}
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int main(int argc, char* argv[]) {
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if(argc > 1) {
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NRJWORD mem[NRJSIZE];
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FILE *prog = fopen(argv[1], "rb");
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if(prog) {
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/* load the program */
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fseek(prog, 0, SEEK_END);
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int flen = ftell(prog);
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fseek(prog, 0, SEEK_SET);
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fread(mem, NRJWSIZE, (flen/NRJWSIZE) & MAXADDR, prog);
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fclose(prog);
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/* prepare the terminal */
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tcgetattr(STDIN_FILENO, &tty_opts_backup);
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atexit(&restore_term);
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cfmakeraw(&tty_opts_raw);
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tcsetattr(STDIN_FILENO, TCSANOW, &tty_opts_raw);
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/* start the engine */
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nrj_run(mem, 3);
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}
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else {
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printf("NRJ16: could not open the input file %s\r\n", argv[1]);
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return 1;
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}
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} else {
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puts("NRJ16: no binary specified\r");
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return 1;
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}
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return 0;
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}
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