Redirrect support for >, >>, <, &>, 2>

- cd does less work now

main.c

@@ -7,6 +7,7 @@
 #include <signal.h>
 #include <setjmp.h>
 #include <ctype.h>
+#include <fcntl.h>
 
 constexpr size_t max_length = 1024;
 constexpr size_t max_env_var_length = 256;
@@ -86,7 +87,7 @@ struct command
    * IO redirections; redirect[i] should be used as fd i in the child.
    * A value of -1 indicates no redirect.
    */
-  int redirect[2];
+  int redirect[3];
   /** The arguments; must be NULL-terminated. */
   char* argv[];
 };
@@ -358,6 +359,13 @@ char* parse_token(char** input)
   return buf;
 }
 
+int open_fout(const char* file, bool append)
+{
+  return open(file,
+    O_WRONLY | O_CREAT | (append ? O_APPEND : O_TRUNC),
+    0644);
+}
+
 /**
  * Parses str into a freshly allocated command struct and returns a pointer to it.
  * The redirects in the returned command will be set to -1, ie no redirect.
@@ -378,6 +386,8 @@ struct command* parse_command(char* str)
   struct command* ret = ccalloc(sizeof(struct command) + strlen(copy) * sizeof(char*), 1);
   parser_allocated(ret);
 
+  ret->redirect[0] = ret->redirect[1] = ret->redirect[2] = -1;
+
   char* p = copy;
 
   while (*p)
@@ -387,9 +397,47 @@ struct command* parse_command(char* str)
     if (!token)
       break;
 
+    if (strcmp(token, ">") == 0)
+    {
+      char* file = parse_token(&p);
+      int fd = open_fout(file, false);
+      ret->redirect[STDOUT_FILENO] = fd;
+      continue;
+    }
+    if (strcmp(token, ">>") == 0)
+    {
+      char* file = parse_token(&p);
+      int fd = open_fout(file, true);
+      ret->redirect[STDOUT_FILENO] = fd;
+      continue;
+    }
+    if (strcmp(token, "<") == 0)
+    {
+      char* file = parse_token(&p);
+      int fd = open(file, O_RDONLY);
+      ret->redirect[STDIN_FILENO] = fd;
+      continue;
+    }
+
+    if (strcmp(token, "2>") == 0)
+    {
+      char* file = parse_token(&p);
+      int fd = open_fout(file, false);
+      ret->redirect[STDERR_FILENO] = fd;
+      continue;
+    }
+
+    if (strcmp(token, "&>") == 0)
+    {
+      char* file = parse_token(&p);
+      int fd = open_fout(file, false);
+      ret->redirect[STDOUT_FILENO] = fd;
+      ret->redirect[STDERR_FILENO] = fd;
+      continue;
+    }
+
     ret->argv[i++] = token;
   }
-  ret->redirect[0] = ret->redirect[1] = -1;
   return ret;
 }
 
@@ -495,15 +543,17 @@ void close_ALL_the_pipes(int n_pipes, int (*pipes)[2])
 
 int exec_with_redir(struct command* command, int n_pipes, int (*pipes)[2])
 {
-  int fd = -1;
-  if ((fd = command->redirect[0]) != -1)
+  void apply_redir(int fd, int target)
   {
-    dup2(fd, STDIN_FILENO);
-  }
-  if ((fd = command->redirect[1]) != -1)
+    if (fd != -1)
     {
-    dup2(fd, STDOUT_FILENO);
+      dup2(fd, target);
+      if (fd > 2) close(fd); //if file
     }
+  }
+  apply_redir(command->redirect[0], STDIN_FILENO);
+  apply_redir(command->redirect[1], STDOUT_FILENO);
+  apply_redir(command->redirect[2], STDERR_FILENO);
   close_ALL_the_pipes(n_pipes, pipes);
   return execvp(command_name(command), command->argv);
 }
@@ -536,6 +586,10 @@ pid_t run_with_redir(struct command* command, int n_pipes, int (*pipes)[2])
 int cd(char* path)
 {
   int result = chdir(path);
+  if(result < 0)
+  {
+    return result;
+  }
   char cwd[max_length];
   if (getcwd(cwd, sizeof(cwd)) != NULL)
   {