Add: brainfuck interpreter; documentation; uptime

src/drivers/kb.h

@@ -0,0 +1,6 @@
+#ifndef KB_H
+#define KB_H
+
+char keyboard_getchar();
+
+#endif

src/drivers/timer.c

@@ -19,3 +19,8 @@ void delay(int ticks)
 	eticks = global_ticks + ticks;
 	while (global_ticks < eticks);
 }
+
+int uptime()
+{
+	return global_ticks;
+}

src/kernel/shell.c

@@ -21,7 +21,7 @@ void shell_install()
     }
     else if (strcmp(input_buffer, "help") == 0)
     {
-        printf("help\tpanic\twords\tprimes\trainbow\tclear\nmath\n");
+        printf("help\tpanic\twords\tprimes\trainbow\tclear\nmath\tbf\tuptime\n");
     }
     else if (strcmp(input_buffer, "panic") == 0)
     {
@@ -47,6 +47,14 @@ void shell_install()
     {
 	    program_math();
     }
+    else if (strcmp(input_buffer, "bf") == 0)
+    {
+	    program_bf();
+    }
+    else if (strcmp(input_buffer, "uptime") == 0)
+    {
+	    program_uptime();
+    }
     else {
 	printf("Unknown command %s\n", input_buffer);
     }

src/kernel/system.h

@@ -22,6 +22,7 @@ void delay(int ticks);
 void keyboard_install();
 char keyboard_getchar();
 void shell_install();
+int uptime();
 
 extern volatile unsigned long global_ticks;
 

src/programs/bf.c

@@ -0,0 +1,55 @@
+
+#include "../kernel/system.h"
+#include "../libc/stdio.h"
+
+#define BUF_SIZE 256
+
+void brainfuck(char* input)
+{
+	unsigned char tape[30000] = {0};
+	unsigned char* ptr = tape;
+	char current_char;
+	size_t i;
+	size_t loop;
+
+	for (i=0; input[i] != 0; i++)
+	{
+		current_char = input[i];
+		if (current_char == '>') {
+			++ptr;
+		} else if (current_char == '<') {
+			--ptr;
+		} else if (current_char == '+') {
+			++*ptr;
+		} else if (current_char == '-') {
+			--*ptr;
+		} else if (current_char == '.') {
+			putc(*ptr);
+		} else if (current_char == ',') {
+			*ptr = keyboard_getchar();
+		} else if (current_char == '[') {
+			continue;
+		} else if (current_char == ']' && *ptr) {
+			loop = 1;
+			while (loop > 0)
+			{
+				current_char = input[--i];
+				if (current_char == '[') {
+					loop--;
+				} else if (current_char == ']') {
+					loop++;
+				}
+			}
+		}
+	}
+}
+
+void program_bf()
+{
+	char input_buffer[BUF_SIZE];
+	puts("Brainfuck code? ");
+	get_input(input_buffer, BUF_SIZE);
+	brainfuck(input_buffer);
+	//brainfuck(",[.[-],]");
+	puts("\n");
+}

src/programs/misc.c

@@ -1,6 +1,7 @@
 // Miscellaneous small programs
 
 #include "../libc/stdio.h"
+#include "../kernel/system.h"
 
 // Print a rainbow colorful text for testing
 
@@ -29,3 +30,10 @@ void program_clear()
 {	
 	for (int i=0; i<ROWS; i++) scroll(1);
 }
+
+// Get uptime in ticks
+
+void program_uptime()
+{
+	printf("%d ticks\n", uptime());
+}

src/programs/programs.h

@@ -4,8 +4,11 @@
 void program_words();
 void program_primes();
 void program_math();
+void program_bf();
 
 // Misc
 void program_rainbow();
 void program_clear();
+void program_uptime();
+
 #endif