luxferre/nrj-oisc
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even more optimizations

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Luxferre
2022-08-22 19:55:24 +03:00
parent b7e539596d
commit 1022bb1cfb
1 changed files with 21 additions and 21 deletions
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nrj.c
+21 -21
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@@ -1,6 +1,6 @@
/* /*
* NRJ (NOR and Reference Jump) OISC ANSI C emulator by Luxferre * NRJ (NOR and Reference Jump) OISC ANSI C emulator
* Public domain * Created by Luxferre, 2022, public domain
* Build with: cc -Os -o nrj nrj.c * Build with: cc -Os -o nrj nrj.c
*/ */
#include <stdlib.h> #include <stdlib.h>
@@ -23,43 +23,43 @@ int kbhit() {
return select(1, &fds, NULL, NULL, &tv) > 0; return select(1, &fds, NULL, NULL, &tv) > 0;
} }
struct termios tty_opts_backup, tty_opts_raw; void nrj_in(NRJWORD *ctxid, NRJWORD *val) { /* context-dependent input handler */
void restore_term() {
tcsetattr(STDIN_FILENO, TCSANOW, &tty_opts_backup);
}
void nrj_in(NRJWORD *ctxid, NRJWORD *val) {
unsigned char c; unsigned char c;
if(*ctxid == (NRJWORD) 0) { /* for now, only emulate standard context id */ if(*ctxid == (NRJWORD) 0) { /* for now, only emulate standard context id */
*val = (NRJWORD) 0; *val = (NRJWORD) 0;
if(kbhit()) { if(kbhit() && read(0, &c, 1) > -1)
if(read(0, &c, 1) > -1) *val = (NRJWORD) c;
*val = (NRJWORD) c;
}
} }
} }
void nrj_out(NRJWORD *ctxid, NRJWORD *val) { void nrj_out(NRJWORD *ctxid, NRJWORD *val) { /* context-dependent output handler */
if(*ctxid == (NRJWORD) 0) /* for now, only emulate standard context id */ if(*ctxid == (NRJWORD) 0) /* for now, only emulate standard context id */
putchar((unsigned char) *val); putchar((unsigned char) *val);
} }
void nrj_run(NRJWORD *mem, NRJWORD pc) { /* 0 - input, 1 - output, 2 - I/O context, 3 - program start */ void nrj_run(NRJWORD *mem, NRJWORD pc) { /* Main NRJ engine - just 12 lines of C within this function */
while(pc != MAXADDR) { while(pc != MAXADDR) { /* halt if jumped to the last word */
if(mem[0]) nrj_in(&mem[2], &mem[mem[0]]); if(mem[0]) { /* handle input if the first word is set, and clear it */
mem[mem[pc]] = (~(mem[mem[pc]] | mem[mem[pc+1]])) & MAXADDR; nrj_in(&mem[2], &mem[mem[0]]);
pc = mem[mem[pc+2]]; mem[0] = (NRJWORD) 0;
mem[0] = (NRJWORD) 0; }
if(mem[1]) { mem[mem[pc]] = (~(mem[mem[pc]] | mem[mem[pc+1]])) & MAXADDR; /* then perform the NOR operation */
pc = mem[mem[pc+2]]; /* then perform the reference jump operation */
if(mem[1]) { /* then handle output if the second word is set, and clear it */
nrj_out(&mem[2], &mem[mem[1]]); nrj_out(&mem[2], &mem[mem[1]]);
mem[1] = (NRJWORD) 0; mem[1] = (NRJWORD) 0;
} }
} }
} }
struct termios tty_opts_backup, tty_opts_raw;
void restore_term() {
tcsetattr(STDIN_FILENO, TCSANOW, &tty_opts_backup);
}
int main(int argc, char* argv[]) { int main(int argc, char* argv[]) {
if(argc > 1) { if(argc > 1) {
NRJWORD mem[NRJSIZE]; NRJWORD mem[NRJSIZE]; /* NRJ memory: word 0 - input, 1 - output, 2 - I/O context, 3 - program start */
FILE *prog = fopen(argv[1], "rb"); FILE *prog = fopen(argv[1], "rb");
if(prog) { if(prog) {
/* load the program */ /* load the program */