Add string manipulation functions. Update Makefile accordingly. Add echo command to kernel32.

Makefile

@@ -2,7 +2,7 @@ CFLAGS = -m32 -mgeneral-regs-only -nostdlib -fno-builtin -fno-exceptions -fno-le
 LDFLAGS = 
 
 DISK_IMG_FILES = kernel.bin hello.bin print.bin boot32.bin kernel32.bin
-KERNEL32_OBJS = screenstuff.o io.o idt.o keyboard.o kernel32_strap.o kernel32.o
+KERNEL32_OBJS = screenstuff.o io.o idt.o keyboard.o strings.o kernel32_strap.o kernel32.o
 
 run: disk.img
 	qemu-system-x86_64 disk.img

kernel32.c

@@ -4,15 +4,7 @@
 #include "idt.h"
 #include "keyboard.h"
 
-bool strcmp(char* a, char* b, int max) {
-  int index = 0;
-  while (index < max) {
-    if (a[index] != b[index])
-      return false;
-    index++;
-  }
-  return true;
-}
+#include "strings.h"
 
 int main() {
   init_idt();
@@ -33,8 +25,11 @@ int main() {
       buffer[i] = 0;
     readline(128, buffer);
 
-    //printf("%s\n", buffer);
-    if (strcmp(buffer, "help", 4)) {
+    char* argv[32];
+    int argc = string_split(' ', buffer, argv);
+
+
+    if (strcmp(argv[0], "help", 4)) {
       printf(
         "XnoeOS 32 Bit Mode Help.\n"
         "------------------------\n"
@@ -43,9 +38,14 @@ int main() {
         "- clear\n"
         ": Clears the screen\n"
       );
-    } else if (strcmp(buffer, "clear", 5)) {
+    } else if (strcmp(argv[0], "clear", 5)) {
       clear_screen();
       set_curpos(0, 0);
+    } else if (strcmp(argv[0], "echo", 4)) {
+      int index = 0;
+      while (++index <= argc)
+        printf("%s ", argv[index]);
+      printf("\n");
     }
   }
 }

strings.c

@@ -0,0 +1,33 @@
+#include "strings.h"
+
+bool strcmp(char* a, char* b, int max) {
+  int index = 0;
+  while (index < max) {
+    if (a[index] != b[index])
+      return false;
+    index++;
+  }
+  return true;
+}
+
+int string_split(char delimeter, char* string, char** pointer_array) {
+  int index = 0;
+  int last_split_index = 0;
+  int split_count = 0;
+
+  char current;
+
+  while (current = string[index]) {
+    if (current == delimeter) {
+      string[index] = 0;
+      pointer_array[split_count++] = (string+last_split_index);
+      last_split_index = (index+1);
+    }
+    index++;
+  }
+
+  // Add remaining part of the string to the pointer_array
+  pointer_array[split_count] = (string+last_split_index);
+
+  return split_count;
+}

strings.h

@@ -0,0 +1,9 @@
+#ifndef STRINGS_H
+#define STRINGS_H
+
+#include <stdbool.h>
+
+bool strcmp(char* a, char* b, int max);
+int string_split(char delimeter, char* string, char** pointer_array);
+
+#endif