74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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uint16_t compile(const char *prog, uint8_t *tape, uint16_t tape_len, uint8_t **idx, uint8_t eval) {
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uint16_t elapsed = 1;
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while(*prog) {
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uint16_t traveled = 1;
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if(eval && *prog == '>') {
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if(*idx == tape + tape_len) {
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*idx = tape;
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} else {
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*idx += 1;
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}
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} else if(eval && *prog == '<') {
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if(*idx == tape) {
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*idx = tape + tape_len;
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} else {
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*idx -= 1;
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}
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} else if(eval && *prog == '+') {
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if(**idx == (2 << 7) - 1) {
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**idx = 0;
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} else {
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**idx += 1;
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}
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} else if(eval && *prog == '-') {
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if(**idx == 0) {
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**idx = (2 << 7) - 1;
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} else {
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**idx -= 1;
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}
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} else if(eval && *prog == '.') {
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putchar(**idx);
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} else if(eval && *prog == ',') {
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**idx = getchar();
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} else if(*prog == '[') {
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uint8_t should_eval = **idx > 0;
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if(!eval) {
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should_eval = 0;
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}
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traveled = compile(prog + 1, tape, tape_len, idx, should_eval);
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} else if(*prog == ']') {
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if(eval && **idx > 0) {
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return 0;
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} else {
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return elapsed + 1;
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}
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}
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elapsed += traveled;
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prog += traveled;
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}
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return 0;
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}
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int main(int argc, char **argv) {
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if(argc != 2) {
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return 1;
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}
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const char *prog = argv[1];
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uint8_t tape[30000] = { 0 };
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uint16_t tape_len = sizeof(tape);
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uint8_t *idx = tape;
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uint8_t eval = 1;
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compile(prog, tape, tape_len, &idx, eval);
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}
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