chdir

cd in shell
nits in mkdir, ls, etc.

1 files changed, 10 insertions, 4 deletions

diff --git a/sh.c b/sh.c
index e2b8959..9e0cb3f 100644
--- a/sh.c
+++ b/sh.c
@@ -15,15 +15,20 @@ main(void)
 
   while(1){
     puts("$ ");
+    memset (buf, '\0', sizeof(buf));
     gets(buf, sizeof(buf));
     if(buf[0] == '\0')
       continue;
     pid = fork();
     if(pid == 0){
       parse(buf);
-      exec(buf, args);
-      printf(1, "%s: not found\n", buf);
-      exit();
+      if (buf[0] == 'c' && buf[1] == 'd' && buf[2] == '\0') {  // cd
+	chdir(&buf[3]);
+      } else {
+	exec(buf, args);
+	printf(1, "%s: not found\n", buf);
+	exit();
+      }
     }
     if(pid > 0)
       wait();
@@ -39,11 +44,12 @@ parse(char buf[])
   for (i = 0; buf[i] != '\0'; i++) {
     if (buf[i] == ' ') {
       buf[i] = '\0';
-      args[j++] = buf + i+1;
+      args[j++] = buf + i + 1;
       if (j >= 100) {
 	printf(2, "too many args\n");
 	exit();
       }
     }
   }
+  args[j] = '\0';
 }