Execute Brain****/C: Difference between revisions

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@@ Line 225: / Line 225: @@
 #include <stdlib.h>
 #include <string.h>
+char *nested_loop (char *s, char *tape, int d) {
+	char *p = ++s;
+	while(*p != ']') {
+		int c = *p;
+		switch(c) {
+			case '+': tape[d]++; break;
+			case '-': tape[d]--; break;
+			case '>': d++; break;
+			case '<': d--; break;
+			case '.': putchar(tape[d]); break;
+			case ',': tape[d] = getchar(); break;
+			case '[': p = nested_loop(p, tape, d); break;
+			default: break;
+		}
+		p++;
+		if(*p == ']' && tape[d] != 0) p = s;
+	}
+	return p;
+}
 void bf_run(char *s) {
 	int len = strlen(s), d = 0;
 	char *tape = calloc(len, sizeof(char));
+	int brack = 0;
 	for (; d >= 0 && *s; s++) {
-		if (*s == '[') { //if there is a loop
+		if (*s == '[') {
 			char *p = ++s;
-			while(*p != ']') { //take care of the loop part
+			while(*p != ']') {
 				int c = *p;
 				switch(c) {
@@ Line 243: / Line 266: @@
 					case '.': putchar(tape[d]); break;
 					case ',': tape[d] = getchar(); break;
+					case '[': p = nested_loop(p, tape, d); break;
 					default: break;
 				}
 				p++;
-				if(*p == ']' && tape[d] != 0) p = s; //the loop stops when the cell has value equal to 0
+				if(*p == ']' && tape[d] != 0) p = s;
 			}
 			s = p + 1;
 		}