Created
August 1, 2014 20:01
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This is an interpreter for the Braille esolang: http://esolangs.org/wiki/Braille
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#include <stdio.h> | |
#include <stdlib.h> | |
unsigned char convert(unsigned char c) | |
{ | |
return (c & 0x40) << 1 | |
| (c & 0x07) << 4 | |
| (c & 0x80) >> 4 | |
| (c & 0x38) >> 3; | |
} | |
void execute(unsigned char *tape, size_t dp) | |
{ | |
unsigned char insn, arg; | |
size_t ip = 0; | |
while (++ip) { | |
insn = tape[ip] & 0xf0; | |
arg = tape[ip] & 0x0f; | |
switch (insn) { | |
case 0x00: exit(arg); break; | |
case 0x10: *tape += tape[dp + arg]; break; | |
case 0x20: *tape -= tape[dp + arg]; break; | |
case 0x30: tape[dp + arg] = *tape; break; | |
case 0x40: *tape = tape[dp] + arg; break; | |
case 0x50: dp += 1 << arg; break; | |
case 0x60: dp -= 1 << arg; break; | |
case 0x70: ip += arg + 1; break; | |
case 0x80: ip -= arg + 2; break; | |
case 0x90: if (!*tape) ip += arg + 1; break; | |
case 0xa0: if (!*tape) ip -= arg + 2; break; | |
case 0xb0: if (*tape) ip += arg + 1; break; | |
case 0xc0: if (*tape) ip -= arg + 2; break; | |
case 0xd0: tape[dp + arg] = getchar(); break; | |
case 0xe0: putchar(tape[dp + arg]); break; | |
case 0xf0: tape[dp + arg] = rand() % 0xff; break; | |
} | |
} | |
} | |
int main(int argc, char **argv) | |
{ | |
int c; | |
FILE *src; | |
size_t cap = 1, len = 1; | |
unsigned char *tape = calloc(1, 1); | |
if (argc != 2) | |
return fprintf(stderr, "Usage: %s FILE\n", *argv); | |
if (!(src = fopen(argv[1], "r"))) | |
return fprintf(stderr, "Unable to open file '%s'\n", argv[1]); | |
while ((c = fgetc(src)) != EOF) { | |
if (c == 0xe2) { /* found Braille character */ | |
c = convert((fgetc(src) - 0xa0) * 0x40 + (fgetc(src) - 0x80)); | |
if (cap == len) | |
tape = realloc(tape, cap <<= 1); | |
tape[len++] = c; | |
} | |
} | |
srand((unsigned int) &c); | |
execute(tape, len); | |
fclose(src); | |
free(tape); | |
return 0; | |
} |
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