1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main(int argc, char **argv)
{
if (argc != 2) {
fprintf(stderr, "Usage: %s file.bf\n", argv[0]);
exit(EXIT_FAILURE);
}
FILE *fp = fopen(argv[1], "r");
fseek(fp, 0, SEEK_END);
size_t program_size = ftell(fp);
fseek(fp, 0, SEEK_SET);
char program[program_size + 1];
program[program_size] = 0;
fread(program, sizeof(uint8_t), program_size, fp);
fclose(fp);
size_t dp = 0;
size_t pc = 0;
uint8_t mem[3000] = { 0 };
while (pc < program_size) {
switch (program[pc]) {
case '>': {
dp++;
break;
}
case '<': {
dp--;
break;
}
case '+': {
mem[dp]++;
break;
}
case '-': {
mem[dp]--;
break;
}
case ',': {
mem[dp] = getchar();
break;
}
case '.': {
putchar(mem[dp]);
break;
}
case '[': {
if (mem[dp] == 0) {
size_t l = 1;
while (l) {
switch (program[++pc]) {
case '[': {
l++;
break;
}
case ']': {
l--;
break;
}
}
}
}
break;
}
case ']': {
if (mem[dp] != 0) {
size_t l = 1;
while (l) {
switch (program[--pc]) {
case ']': { l++;
break;
}
case '[': {
l--;
break;
}
}
}
}
break;
}
}
pc++;
}
return EXIT_SUCCESS;
}
|
