1 files changed, 136 insertions, 0 deletions
diff --git a/src/dirname.c b/src/dirname.c
new file mode 100644
index 0000000..4f0bd44
--- /dev/null
+++ b/src/dirname.c
@@ -0,0 +1,136 @@
+/* dirname -- strip suffix from file name
+
+   Copyright (C) 1990-2022 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by David MacKenzie and Jim Meyering. */
+
+#include <config.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include "system.h"
+#include "error.h"
+
+/* The official name of this program (e.g., no 'g' prefix).  */
+#define PROGRAM_NAME "dirname"
+
+#define AUTHORS \
+  proper_name ("David MacKenzie"), \
+  proper_name ("Jim Meyering")
+
+static struct option const longopts[] =
+{
+  {"zero", no_argument, NULL, 'z'},
+  {GETOPT_HELP_OPTION_DECL},
+  {GETOPT_VERSION_OPTION_DECL},
+  {NULL, 0, NULL, 0}
+};
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("\
+Usage: %s [OPTION] NAME...\n\
+"),
+              program_name);
+      fputs (_("\
+Output each NAME with its last non-slash component and trailing slashes\n\
+removed; if NAME contains no /'s, output '.' (meaning the current directory).\n\
+\n\
+"), stdout);
+      fputs (_("\
+  -z, --zero     end each output line with NUL, not newline\n\
+"), stdout);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      printf (_("\
+\n\
+Examples:\n\
+  %s /usr/bin/          -> \"/usr\"\n\
+  %s dir1/str dir2/str  -> \"dir1\" followed by \"dir2\"\n\
+  %s stdio.h            -> \".\"\n\
+"),
+              program_name, program_name, program_name);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+int
+main (int argc, char **argv)
+{
+  static char const dot = '.';
+  bool use_nuls = false;
+  char const *result;
+  size_t len;
+
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  atexit (close_stdout);
+
+  while (true)
+    {
+      int c = getopt_long (argc, argv, "z", longopts, NULL);
+
+      if (c == -1)
+        break;
+
+      switch (c)
+        {
+        case 'z':
+          use_nuls = true;
+          break;
+
+        case_GETOPT_HELP_CHAR;
+        case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+
+        default:
+          usage (EXIT_FAILURE);
+        }
+    }
+
+  if (argc < optind + 1)
+    {
+      error (0, 0, _("missing operand"));
+      usage (EXIT_FAILURE);
+    }
+
+  for (; optind < argc; optind++)
+    {
+      result = argv[optind];
+      len = dir_len (result);
+
+      if (! len)
+        {
+          result = &dot;
+          len = 1;
+        }
+
+      fwrite (result, 1, len, stdout);
+      putchar (use_nuls ? '\0' :'\n');
+    }
+
+  return EXIT_SUCCESS;
+}