Changeset 8013637 in mainline for uspace/app/bdsh/cmds/builtins/cd/cd.c

Timestamp:

2012-07-20T13:51:28Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8fccd42

Parents:

c5bff3c (diff), 7030bc9 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

More mainline changes.

File:

• uspace/app/bdsh/cmds/builtins/cd/cd.c (modified) (5 diffs)

uspace/app/bdsh/cmds/builtins/cd/cd.c

@@ -41 +41 @@
 static const char *cmdname = "cd";
 
+/* Previous directory variables.
+ *
+ * Declaring them static to avoid many "== NULL" checks.
+ * PATH_MAX is not that big to cause any problems with memory overhead.
+ */
+static char previous_directory[PATH_MAX] = "";
+static char previous_directory_tmp[PATH_MAX];
+static bool previous_directory_valid = true;
+static bool previous_directory_set = false;
+
+static int chdir_and_remember(const char *new_dir) {
+
+        char *ok = getcwd(previous_directory_tmp, PATH_MAX);
+        previous_directory_valid = ok != NULL;
+        previous_directory_set = true;
+
+        int rc = chdir(new_dir);
+        if (rc != EOK) {
+                return rc;
+        }
+
+        str_cpy(previous_directory, PATH_MAX, previous_directory_tmp);
+        return EOK;
+}
+
 void help_cmd_cd(unsigned int level)
 {
@@ -55 +80 @@
 }
 
+
 /* This is a very rudamentary 'cd' command. It is not 'link smart' (yet) */
 
@@ -62 +88 @@
 
         argc = cli_count_args(argv);
+
+        /* Handle cd -- -. Override to switch to a directory named '-' */
+        bool hyphen_override = false;
+        char *target_directory = argv[1];
+        if (argc == 3) {
+                if (!str_cmp(argv[1], "--")) {
+                        hyphen_override = true;
+                        argc--;
+                        target_directory = argv[2];
+                }
+        }
 
         /* We don't yet play nice with whitespace, a getopt implementation should
@@ -79 +116 @@
         }
 
-        /* We have the correct # of arguments
-     * TODO: handle tidle (~) expansion? */
+        /* We have the correct # of arguments */
+        // TODO: handle tidle (~) expansion? */
 
-        rc = chdir(argv[1]);
+        /* Handle 'cd -' first. */
+        if (!str_cmp(target_directory, "-") && !hyphen_override) {
+                if (!previous_directory_valid) {
+                        cli_error(CL_EFAIL, "Cannot switch to previous directory");
+                        return CMD_FAILURE;
+                }
+                if (!previous_directory_set) {
+                        cli_error(CL_EFAIL, "No previous directory to switch to");
+                        return CMD_FAILURE;
+                }
+                char *prev_dup = str_dup(previous_directory);
+                if (prev_dup == NULL) {
+                        cli_error(CL_ENOMEM, "Cannot switch to previous directory");
+                        return CMD_FAILURE;
+                }
+                rc = chdir_and_remember(prev_dup);
+                free(prev_dup);
+        } else {
+                rc = chdir_and_remember(target_directory);
+        }
 
         if (rc == 0) {
@@ -93 +149 @@
                         break;
                 case ENOENT:
-                        cli_error(CL_ENOENT, "Invalid directory `%s'", argv[1]);
+                        cli_error(CL_ENOENT, "Invalid directory `%s'", target_directory);
                         break;
                 default:
-                        cli_error(CL_EFAIL, "Unable to change to `%s'", argv[1]);
+                        cli_error(CL_EFAIL, "Unable to change to `%s'", target_directory);
                         break;
                 }