1 files changed, 213 insertions, 0 deletions

diff --git a/gnu/usr.bin/diff/dir.c b/gnu/usr.bin/diff/dir.c
new file mode 100644
index 000000000000..a5e3e2cbe9fc
--- /dev/null
+++ b/gnu/usr.bin/diff/dir.c
@@ -0,0 +1,213 @@
+/* Read, sort and compare two directories.  Used for GNU DIFF.
+   Copyright (C) 1988, 1989, 1992 Free Software Foundation, Inc.
+
+This file is part of GNU DIFF.
+
+GNU DIFF 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 2, or (at your option)
+any later version.
+
+GNU DIFF 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 GNU DIFF; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "diff.h"
+
+static int compare_names ();
+
+/* Read the directory named by DIR and store into DIRDATA a sorted vector
+   of filenames for its contents.  DIR->desc == -1 means this directory is
+   known to be nonexistent, so set DIRDATA to an empty vector.
+   Return -1 (setting errno) if error, 0 otherwise.  */
+
+struct dirdata
+{
+  char **files;	/* Sorted names of files in dir, terminated by (char *) 0. */
+  char *data;	/* Allocated storage for file names.  */
+};
+
+static int
+dir_sort (dir, dirdata)
+     struct file_data *dir;
+     struct dirdata *dirdata;
+{
+  register struct direct *next;
+  register int i;
+
+  /* Address of block containing the files that are described.  */
+  char **files;
+
+  /* Number of files in directory.  */
+  int nfiles;
+
+  /* Allocated and used storage for file name data.  */
+  char *data;
+  size_t data_alloc, data_used;
+
+  dirdata->files = 0;
+  dirdata->data = 0;
+  nfiles = 0;
+
+  if (dir->desc != -1)
+    {
+      /* Open the directory and check for errors.  */
+      register DIR *reading = opendir (dir->name);
+      if (!reading)
+	return -1;
+
+      /* Initialize the table of filenames.  */
+
+      data_alloc = max (1, (size_t) dir->stat.st_size);
+      data_used = 0;
+      dirdata->data = data = (char *) xmalloc (data_alloc);
+
+      /* Read the directory entries, and insert the subfiles
+	 into the `data' table.  */
+
+      while ((errno = 0, (next = readdir (reading)) != 0))
+	{
+	  char *d_name = next->d_name;
+	  size_t d_size;
+
+	  /* Ignore the files `.' and `..' */
+	  if (d_name[0] == '.'
+	      && (d_name[1] == 0 || (d_name[1] == '.' && d_name[2] == 0)))
+	    continue;
+
+	  if (excluded_filename (d_name))
+	    continue;
+
+	  d_size = strlen (d_name) + 1;
+	  while (data_alloc < data_used + d_size)
+	    dirdata->data = data = (char *) xrealloc (data, data_alloc *= 2);
+	  bcopy (d_name, data + data_used, d_size);
+	  data_used += d_size;
+	  nfiles++;
+	}
+      if (errno)
+	{
+	  int e = errno;
+	  closedir (reading);
+	  errno = e;
+	  return -1;
+	}
+#ifdef VOID_CLOSEDIR
+      closedir (reading);
+#else
+      if (closedir (reading) != 0)
+	return -1;
+#endif
+    }
+
+  /* Create the `files' table from the `data' table.  */
+  dirdata->files = files = (char **) xmalloc (sizeof (char *) * (nfiles + 1));
+  for (i = 0;  i < nfiles;  i++)
+    {
+      files[i] = data;
+      data += strlen (data) + 1;
+    }
+  files[nfiles] = 0;
+
+  /* Sort the table.  */
+  qsort (files, nfiles, sizeof (char *), compare_names);
+
+  return 0;
+}
+
+/* Sort the files now in the table.  */
+
+static int
+compare_names (file1, file2)
+     char **file1, **file2;
+{
+  return strcmp (*file1, *file2);
+}
+
+/* Compare the contents of two directories named in FILEVEC[0] and FILEVEC[1].
+   This is a top-level routine; it does everything necessary for diff
+   on two directories.
+
+   FILEVEC[0].desc == -1 says directory FILEVEC[0] doesn't exist,
+   but pretend it is empty.  Likewise for FILEVEC[1].
+
+   HANDLE_FILE is a caller-provided subroutine called to handle each file.
+   It gets five operands: dir and name (rel to original working dir) of file
+   in dir 0, dir and name pathname of file in dir 1, and the recursion depth.
+
+   For a file that appears in only one of the dirs, one of the name-args
+   to HANDLE_FILE is zero.
+
+   DEPTH is the current depth in recursion, used for skipping top-level
+   files by the -S option.
+
+   Returns the maximum of all the values returned by HANDLE_FILE,
+   or 2 if trouble is encountered in opening files.  */
+
+int
+diff_dirs (filevec, handle_file, depth)
+     struct file_data filevec[];
+     int (*handle_file) ();
+     int depth;
+{
+  struct dirdata dirdata[2];
+  int val = 0;			/* Return value.  */
+  int i;
+
+  /* Get sorted contents of both dirs.  */
+  for (i = 0; i < 2; i++)
+    if (dir_sort (&filevec[i], &dirdata[i]) != 0)
+      {
+	perror_with_name (filevec[i].name);
+	val = 2;
+      }
+
+  if (val == 0)
+    {
+      register char **files0 = dirdata[0].files;
+      register char **files1 = dirdata[1].files;
+      char *name0 = filevec[0].name;
+      char *name1 = filevec[1].name;
+
+      /* If `-S name' was given, and this is the topmost level of comparison,
+	 ignore all file names less than the specified starting name.  */
+
+      if (dir_start_file && depth == 0)
+	{
+	  while (*files0 && strcmp (*files0, dir_start_file) < 0)
+	    files0++;
+	  while (*files1 && strcmp (*files1, dir_start_file) < 0)
+	    files1++;
+	}
+
+      /* Loop while files remain in one or both dirs.  */
+      while (*files0 || *files1)
+	{
+	  /* Compare next name in dir 0 with next name in dir 1.
+	     At the end of a dir,
+	     pretend the "next name" in that dir is very large.  */
+	  int nameorder = (!*files0 ? 1 : !*files1 ? -1
+			   : strcmp (*files0, *files1));
+	  int v1 = (*handle_file) (name0, 0 < nameorder ? 0 : *files0++,
+				   name1, nameorder < 0 ? 0 : *files1++,
+				   depth + 1);
+	  if (v1 > val)
+	    val = v1;
+	}
+    }
+  
+  for (i = 0; i < 2; i++)
+    {
+      if (dirdata[i].files)
+	free (dirdata[i].files);
+      if (dirdata[i].data)
+	free (dirdata[i].data);
+    }
+
+  return val;
+}