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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <assert.h>
static char* readfile(const char *fname, size_t *length){
int fd = open(fname, O_RDONLY);
if (fd < 0) {
perror("open");
exit(1);
}
struct stat statbuf;
if (fstat(fd, &statbuf) < 0) {
perror("stat");
exit(1);
}
*length = statbuf.st_size;
FILE *f = fdopen(fd, "r");
if (!f) {
fprintf(stderr, "Cannot open file '%s'\n", fname);
exit(1);
}
char *mem = malloc(*length + 1);
assert(fread(mem, 1, *length, f) == *length);
fclose(f);
return mem;
}
static void dump(const uint8_t *mem, size_t memsize, size_t mp) {
size_t low = 0, high = memsize - 1;
while (low < mp && mem[low] == 0) low++;
while (high > mp && mem[high] == 0) high--;
for (size_t i = low; i <= high; i++) {
if (i == mp) fprintf(stderr, "\x1B[4m");
fprintf(stderr, "%3u ", mem[i]);
if (i == mp) fprintf(stderr, "\x1B[0m");
}
fprintf(stderr, "\n");
}
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: %s <file.bf>\n", argv[0]);
return 1;
}
size_t srclen;
char *source = readfile(argv[1], &srclen);
size_t *jm = malloc(srclen * sizeof(size_t));
size_t *stk = malloc(srclen * sizeof(size_t));
size_t stklen = 0;
for (size_t i = 0; i < srclen; i++) {
if (source[i] == '[') {
stk[stklen++] = i;
} else if (source[i] == ']') {
if (stklen == 0) {
fprintf(stderr, "Too many ']'\n");
return 1;
}
jm[stk[stklen-1]] = i;
jm[i] = stk[stklen-1];
stklen--;
}
}
if (stklen > 0) {
fprintf(stderr, "Too many '['\n");
return 1;
}
free(stk);
const size_t memsize = 60000;
uint8_t *mem = calloc(memsize, 1);
size_t mp = memsize / 2;
bool stop = false;
for (size_t i = 0; i < srclen && !stop; i++) {
switch (source[i]) {
case '+': mem[mp]++; break;
case '-': mem[mp]--; break;
case '>': mp++; break;
case '<': mp--; break;
case ',': mem[mp] = getchar(); break;
case '.': putchar(mem[mp]); break;
case '[': if (!mem[mp]) i = jm[i]; break;
case ']': if (mem[mp]) i = jm[i]; break;
case '`': stop = true; break;
case '$': fprintf(stderr, "CRASH\n"); stop = true; break;
// case '*': usleep(5000000); break;
case '*': fprintf(stderr, "CHANGE\n"); source[i] = '`'; break;
default: continue;
}
// dump(mem, memsize, mp);
}
dump(mem, memsize, mp);
free(mem);
free(source);
free(jm);
}
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