Clean code

src/libs/utils.c

@@ -12,6 +12,7 @@ void memset(u8 *start, u8 value, u32 size){
   }
 }
 
+// The following implementation is incomplete
 int modulo(int dividend, int divisor){
   while((dividend-divisor)>0){dividend-=divisor;}
   return dividend;
@@ -21,14 +22,7 @@ int strlen(char * cp)
 {
   int len=0;
   while( cp[len++]) ;
-  return len - 1 ; //because it counted the zero which we don't want.
-}
-
-int wordlen(char *s)
-{
-  int len=0;
-  while( *s!='\n' && *s!='\0' && *s!=' '){ s++; }
-  return len - 1 ; //because it counted the zero which we don't want.
+  return len - 1 ;
 }
 
 u8 strcmp(char *str1, char*str2){
@@ -43,11 +37,11 @@ u8 strcmp(char *str1, char*str2){
 
 u8 strncmp(char *str1, char *str2, int n){
   for(int i=0;i<n;i++){
-	if(str1[i] == '\0' || str2[i] == '\0')
-	  break;
+	if(str1[i] == '\0' || str2[i] == '\0'){
+	  return str1[i] != str2[i];
+	}
 	if(str1[i] != str2[i])
 	  return 1;
   }
-
-  return *str1 != *str2;
+  return 0;
 }

src/libs/utils.h

@@ -23,7 +23,6 @@ int modulo(int dividend, int divisor); // Assumes that both argument are positve
 
 // Strings (not these functions do not follow libc standards and are buggy)
 int strlen(char * cp);
-int wordlen(char *s);
 u8 strcmp(char *str1, char*str2);
 u8 strncmp(char *str1, char*str2, int n);
 

src/main.c

@@ -12,10 +12,13 @@ char cmd[64];
 char *cmdptr=cmd;
 
 // Execute command from cmd buffer
+// This is a test function which is buggy
 void exec(){
-  if(!strncmp(cmd, "blink", strlen("exit")))
+  if(cmd == cmdptr)
+	return;
+  else if(!strncmp(cmd, "blink", 5))
 	gpio_blink_led(1);
-  else if(!strncmp(cmd, "help", strlen("help")))
+  else if(!strncmp(cmd, "help", 4))
 	tty_putstr(HELP);
   else if(cmdptr != cmd)
 	tty_putstr("Unknown command (see help)\n\r");
@@ -30,6 +33,8 @@ void main(){
 
 
   // REPL
+  // TODO: Handling arrows etc.
+  // Pressing arrow freezes the shell
   char c=tty_getchar();
   tty_putstr(MOTD);
   tty_putstr(PROMPT);
@@ -47,14 +52,12 @@ void main(){
 		cmdptr--;
 	  }
 	}
-	else{
+	else if(c>=32 && c <= 127){ // Printable char
 	  *cmdptr=c;
 	  cmdptr++;
 	  tty_putchar(c);
 	}
   }
 
-
-
   return;
 }