/* $Id$ */ /* * Copyright (c) 2009 Dimitri Sokolyuk * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include typedef struct cell Cell; struct cell { char value; Cell *next; Cell *prev; }; Cell * alloccell(void) { Cell *c; c = malloc(sizeof(Cell)); assert(c); c->value = 0; c->next = NULL; c->prev = NULL; return c; } int main(int argc, char **argv) { FILE *fd; Cell *data, *prog, **progp, *p; int ch; if (argc != 2) return -1; fd = fopen(argv[1], "r"); assert(fd); prog = NULL; progp = &prog; p = NULL; while ((ch = fgetc(fd)) != EOF) { *progp = alloccell(); (*progp)->value = ch; (*progp)->prev = p; p = *progp; progp = &(*progp)->next; } fclose(fd); data = alloccell(); for (p = prog; p; p = p->next) { #if debug fprintf(stderr, "\t%c: %ud\n", p->value, data->value); #endif switch (p->value) { case '>': if (!data->next) { data->next = alloccell(); data->next->prev = data; } data = data->next; break; case '<': if (!data->prev) { data->prev = alloccell(); data->prev->next = data; } data = data->prev; break; case '+': ++data->value; break; case '-': --data->value; break; case '.': fputc(data->value, stdout); fflush(stdout); break; case ',': data->value = fgetc(stdin); break; case '[': if (data->value == 0) while (p && p->value != ']') p = p->next; if (!p) goto quit; break; case ']': if (data->value != 0) while (p && p->value != '[') p = p->prev; if (!p) goto quit; break; default: break; } } quit: return 0; }