user-level programs: mkdir and rm

shell parses arguments (very simplistic)
readme version of README (sh doesn't deal with capital characters)
printf recognizes %c
nicer output format for ls

1 files changed, 22 insertions, 3 deletions

diff --git a/sh.c b/sh.c
index 9d4a308..e2b8959 100644
--- a/sh.c
+++ b/sh.c
@@ -1,9 +1,11 @@
-#include "user.h"
 #include "types.h"
+#include "stat.h"
+#include "user.h"
 #include "fs.h"
 #include "fcntl.h"
 
 char *args[100];
+void parse(char buf[]);
 
 int
 main(void)
@@ -18,8 +20,7 @@ main(void)
       continue;
     pid = fork();
     if(pid == 0){
-      args[0] = buf;
-      args[1] = 0;
+      parse(buf);
       exec(buf, args);
       printf(1, "%s: not found\n", buf);
       exit();
@@ -28,3 +29,21 @@ main(void)
       wait();
   }
 }
+
+void
+parse(char buf[])
+{
+  int j = 1;
+  int i;
+  args[0] = buf;
+  for (i = 0; buf[i] != '\0'; i++) {
+    if (buf[i] == ' ') {
+      buf[i] = '\0';
+      args[j++] = buf + i+1;
+      if (j >= 100) {
+	printf(2, "too many args\n");
+	exit();
+      }
+    }
+  }
+}