+/* main process */
+
+int process (char *buffer, int nb, FILE *out) {
+ int i;
+
+ for (i = 0; (i < nb) && (buffer[i] != 0); i++) {
+
+ VERBOSE (DEBUG, fprintf (stderr, "%s: read '%c' (%u)\n", progname, buffer[i], buffer[i]));
+ switch (buffer[i]) {
+ case '>': /* increase pointer */
+ p++;
+ break;
+ case '<': /* decrease pointer */
+ p--;
+ break;
+ case '+': /* increase pointer value */
+ if ((p >= 0) && (p < MEMSIZE)) {
+ mem[p]++;
+ } else {
+ VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
+ return 1;
+ }
+ break;
+ case '-': /* decrease pointer value */
+ if ((p >= 0) && (p < MEMSIZE)) {
+ mem[p]--;
+ } else {
+ VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
+ return 1;
+ }
+ break;
+ case '.': /* output pointer value */
+ if ((p >= 0) && (p < MEMSIZE)) {
+ fprintf (out, "%c", mem[p]);
+ } else {
+ VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
+ return 1;
+ }
+ break;
+ case ',': /* read a byte and store it in memory */
+ if ((p >= 0) && (p < MEMSIZE)) {
+ mem[p] = buffer[++i];
+ } else {
+ VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
+ return 1;
+ }
+ break;
+ case '[': /* jump to right bracket if pointer is set to 0 */
+ if (mem[p] == 0) {
+ int bracket = 1;
+ while ((++i < nb) && (bracket > 0)) {
+ bracket += (buffer[i] == '[') ? +1 : (buffer[i] == ']') ? -1 :0;
+ }
+ if (bracket) {
+ VERBOSE (ERROR, fprintf (stderr, "%s: brace not closed\n", progname));
+ return 1;
+ }
+ } else {
+ return process (buffer + i + 1, nb - i - 1, out);
+ }
+ break;
+ case ']': /* jump to left bracket if pointer is different to 0 */
+ if (mem[p] != 0) {
+ i = -1;
+ }
+ break;
+ case '\n':
+ case '\r':
+ break;
+ default:
+ VERBOSE (WARNING, fprintf (stderr, "%s: can't understand '%c'\n", progname, buffer[i]));
+ }
+
+ //VERBOSE (DEBUG, int _i; fprintf (stderr, "%s: p: %d mem:", progname, p); for (_i = 0; _i < MEMSIZE; _i++) fprintf (stderr, " %d", mem[_i]); fprintf (stderr, "\n"));
+
+ }
+
+ return 0;
+}
+