README.org

@@ -4,9 +4,7 @@ Simple shell for Unix-like systems written in C, that has a funny name (for germ
 * Features
 - Can run commands
 - You can pipe stdout of one command to stdin of another (ex. ~cat main.c | wc --lines~)
-- Your can redirrect output/input with ~>~, ~>>~, ~<~, ~2>~, ~&>~
 - Variables expansion with ~$PATH~ and ~${HOME}~ syntax
-- Shows custom prompt, if ~PS1~ env variable is set
 - Run subcomands with ~$(hostname)~ or ~`pwd`~ (works with pipes)
 - ~cd~ builtin command (~cd~ without arguments moves you to ~$HOME~)
 - ~exit~ builtin command

main.c

@@ -7,7 +7,6 @@
 #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;
@@ -87,7 +86,7 @@ struct command
    * IO redirections; redirect[i] should be used as fd i in the child.
    * A value of -1 indicates no redirect.
    */
-  int redirect[3];
+  int redirect[2];
   /** The arguments; must be NULL-terminated. */
   char* argv[];
 };
@@ -359,13 +358,6 @@ 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.
@@ -386,8 +378,6 @@ 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)
@@ -397,47 +387,9 @@ 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;
 }
 
@@ -543,17 +495,15 @@ void close_ALL_the_pipes(int n_pipes, int (*pipes)[2])
 
 int exec_with_redir(struct command* command, int n_pipes, int (*pipes)[2])
 {
-  void apply_redir(int fd, int target)
+  int fd = -1;
+  if ((fd = command->redirect[0]) != -1)
   {
-    if (fd != -1)
+    dup2(fd, STDIN_FILENO);
+  }
+  if ((fd = command->redirect[1]) != -1)
   {
-      dup2(fd, target);
-      if (fd > 2) close(fd); //if file
+    dup2(fd, STDOUT_FILENO);
   }
-  }
-  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);
 }
@@ -586,10 +536,6 @@ 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)
   {