Add: better dynamic command management

src/kernel/shell.c

@@ -4,59 +4,68 @@
 #include "../programs/programs.h"
 
 #define BUFFER_SIZE 256
+#define MAX_COMMANDS 16
+
+typedef void (*command_func_t)();
+
+typedef struct
+{
+	const char* name;
+	command_func_t function;
+} shell_command_t;
+
+shell_command_t shell_commands[MAX_COMMANDS];
+int command_count = 0;
+
+void register_command(const char* name, command_func_t function)
+{
+	if (command_count < MAX_COMMANDS)
+	{
+		shell_commands[command_count].name = name;
+		shell_commands[command_count].function = function;
+		command_count++;
+	}
+}
+
+command_func_t find_command(const char* name)
+{
+	for (int i=0; i < command_count; i++)
+	{
+		if (strcmp(name, shell_commands[i].name) == 0) 
+			return shell_commands[i].function;
+	}
+	return 0;
+}
 
 void shell_install()
 {
-  while (1) // Bad!!
+  register_command("help", program_help);
+  register_command("panic", program_panic);
+  register_command("words", program_words);
+  register_command("primes", program_primes);
+  register_command("rainbow", program_rainbow);
+  register_command("clear", program_clear);
+  register_command("math", program_math);
+  register_command("bf", program_bf);
+  register_command("uptime", program_uptime);
+  
+  for (;;)
   {
     char input_buffer[BUFFER_SIZE];
     colorputs("blankos> ", 9);
     get_input(input_buffer, BUFFER_SIZE);
     puts("\n");
-    
-    // Childish shell
-    if (strcmp(input_buffer, "") == 0)
-    {
-	continue;
+
+    if (strcmp(input_buffer, "") == 0) {
+    	continue;
     }
-    else if (strcmp(input_buffer, "help") == 0)
+
+    command_func_t command = find_command(input_buffer);
+    if (command)
     {
-        printf("help\tpanic\twords\tprimes\trainbow\tclear\nmath\tbf\tuptime\n");
-    }
-    else if (strcmp(input_buffer, "panic") == 0)
-    {
-	printf("%d", 4/0);
-    }
-    else if (strcmp(input_buffer, "words") == 0)
-    {
-	    program_words();
-    }
-    else if (strcmp(input_buffer, "primes") == 0)
-    {
-	    program_primes();
-    }
-    else if (strcmp(input_buffer, "rainbow") == 0)
-    {
-	program_rainbow();
-    }
-    else if (strcmp(input_buffer, "clear") == 0)
-    {
-	program_clear();
-    }
-    else if (strcmp(input_buffer, "math") == 0)
-    {
-	    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);
+	    command();
+    } else {
+	    printf("Unknown command %s\n", input_buffer);
     }
   }
 }