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source/dirent.c

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+/*
+ * dirent.c
+ *
+ * Derived from DIRLIB.C by Matt J. Weinstein 
+ * This note appears in the DIRLIB.H
+ * DIRLIB.H by M. J. Weinstein   Released to public domain 1-Jan-89
+ *
+ * Updated by Jeremy Bettis <jeremy@hksys.com>
+ * Significantly revised and rewinddir, seekdir and telldir added by Colin
+ * Peters <colin@fu.is.saga-u.ac.jp>
+ *
+ * $Revision$
+ * $Author$
+ * $Date$
+ *
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <io.h>
+#include <direct.h>
+#include <sys/stat.h>
+
+#include <dirent.h>
+
+#define SUFFIX	"*"
+#define	SLASH	"\\"
+
+#define S_ISDIR(m)	((m & S_IFMT) == S_IFDIR)	/* is a directory */
+
+/*
+ * opendir
+ *
+ * Returns a pointer to a DIR structure appropriately filled in to begin
+ * searching a directory.
+ */
+DIR *
+opendir (const char *szPath)
+{
+  DIR *nd;
+  struct _stat statDir;
+
+  errno = 0;
+
+  if (!szPath)
+    {
+      errno = EFAULT;
+      return (DIR *) 0;
+    }
+
+  if (szPath[0] == '\0')
+    {
+      errno = ENOTDIR;
+      return (DIR *) 0;
+    }
+
+  /* Attempt to determine if the given path really is a directory. */
+  if (_stat (szPath, &statDir))
+    {
+      /* Error, stat should have set an error value. */
+      return (DIR *) 0;
+    }
+
+  if (!S_ISDIR (statDir.st_mode))
+    {
+      /* Error, stat reports not a directory. */
+      errno = ENOTDIR;
+      return (DIR *) 0;
+    }
+
+  /* Allocate enough space to store DIR structure and the complete
+   * directory path given. */
+  nd = (DIR *) malloc (sizeof (DIR) + strlen (szPath) + strlen (SLASH) +
+		       strlen (SUFFIX));
+
+  if (!nd)
+    {
+      /* Error, out of memory. */
+      errno = ENOMEM;
+      return (DIR *) 0;
+    }
+
+  /* Create the search expression. */
+  strcpy (nd->dd_name, szPath);
+
+  /* Add on a slash if the path does not end with one. */
+  if (nd->dd_name[0] != '\0' &&
+      nd->dd_name[strlen (nd->dd_name) - 1] != '/' &&
+      nd->dd_name[strlen (nd->dd_name) - 1] != '\\')
+    {
+      strcat (nd->dd_name, SLASH);
+    }
+
+  /* Add on the search pattern */
+  strcat (nd->dd_name, SUFFIX);
+
+  /* Initialize handle to -1 so that a premature closedir doesn't try
+   * to call _findclose on it. */
+  nd->dd_handle = -1;
+
+  /* Initialize the status. */
+  nd->dd_stat = 0;
+
+  /* Initialize the dirent structure. ino and reclen are invalid under
+   * Win32, and name simply points at the appropriate part of the
+   * findfirst_t structure. */
+  nd->dd_dir.d_ino = 0;
+  nd->dd_dir.d_reclen = 0;
+  nd->dd_dir.d_namlen = 0;
+  nd->dd_dir.d_name = nd->dd_dta.name;
+
+  return nd;
+}
+
+
+/*
+ * readdir
+ *
+ * Return a pointer to a dirent structure filled with the information on the
+ * next entry in the directory.
+ */
+struct dirent *
+readdir (DIR * dirp)
+{
+  errno = 0;
+
+  /* Check for valid DIR struct. */
+  if (!dirp)
+    {
+      errno = EFAULT;
+      return (struct dirent *) 0;
+    }
+
+  if (dirp->dd_dir.d_name != dirp->dd_dta.name)
+    {
+      /* The structure does not seem to be set up correctly. */
+      errno = EINVAL;
+      return (struct dirent *) 0;
+    }
+
+  if (dirp->dd_stat < 0)
+    {
+      /* We have already returned all files in the directory
+       * (or the structure has an invalid dd_stat). */
+      return (struct dirent *) 0;
+    }
+  else if (dirp->dd_stat == 0)
+    {
+      /* We haven't started the search yet. */
+      /* Start the search */
+      dirp->dd_handle = _findfirst (dirp->dd_name, &(dirp->dd_dta));
+
+      if (dirp->dd_handle == -1)
+	{
+	  /* Whoops! Seems there are no files in that
+	   * directory. */
+	  dirp->dd_stat = -1;
+	}
+      else
+	{
+	  dirp->dd_stat = 1;
+	}
+    }
+  else
+    {
+      /* Get the next search entry. */
+      if (_findnext (dirp->dd_handle, &(dirp->dd_dta)))
+	{
+	  /* We are off the end or otherwise error. */
+	  _findclose (dirp->dd_handle);
+	  dirp->dd_handle = -1;
+	  dirp->dd_stat = -1;
+	}
+      else
+	{
+	  /* Update the status to indicate the correct
+	   * number. */
+	  dirp->dd_stat++;
+	}
+    }
+
+  if (dirp->dd_stat > 0)
+    {
+      /* Successfully got an entry. Everything about the file is
+       * already appropriately filled in except the length of the
+       * file name. */
+      dirp->dd_dir.d_namlen = strlen (dirp->dd_dir.d_name);
+      return &dirp->dd_dir;
+    }
+
+  return (struct dirent *) 0;
+}
+
+
+/*
+ * closedir
+ *
+ * Frees up resources allocated by opendir.
+ */
+int
+closedir (DIR * dirp)
+{
+  int rc;
+
+  errno = 0;
+  rc = 0;
+
+  if (!dirp)
+    {
+      errno = EFAULT;
+      return -1;
+    }
+
+  if (dirp->dd_handle != -1)
+    {
+      rc = _findclose (dirp->dd_handle);
+    }
+
+  /* Delete the dir structure. */
+  free (dirp);
+
+  return rc;
+}
+
+/*
+ * rewinddir
+ *
+ * Return to the beginning of the directory "stream". We simply call findclose
+ * and then reset things like an opendir.
+ */
+void
+rewinddir (DIR * dirp)
+{
+  errno = 0;
+
+  if (!dirp)
+    {
+      errno = EFAULT;
+      return;
+    }
+
+  if (dirp->dd_handle != -1)
+    {
+      _findclose (dirp->dd_handle);
+    }
+
+  dirp->dd_handle = -1;
+  dirp->dd_stat = 0;
+}
+
+/*
+ * telldir
+ *
+ * Returns the "position" in the "directory stream" which can be used with
+ * seekdir to go back to an old entry. We simply return the value in stat.
+ */
+long
+telldir (DIR * dirp)
+{
+  errno = 0;
+
+  if (!dirp)
+    {
+      errno = EFAULT;
+      return -1;
+    }
+  return dirp->dd_stat;
+}
+
+/*
+ * seekdir
+ *
+ * Seek to an entry previously returned by telldir. We rewind the directory
+ * and call readdir repeatedly until either dd_stat is the position number
+ * or -1 (off the end). This is not perfect, in that the directory may
+ * have changed while we weren't looking. But that is probably the case with
+ * any such system.
+ */
+void
+seekdir (DIR * dirp, long lPos)
+{
+  errno = 0;
+
+  if (!dirp)
+    {
+      errno = EFAULT;
+      return;
+    }
+
+  if (lPos < -1)
+    {
+      /* Seeking to an invalid position. */
+      errno = EINVAL;
+      return;
+    }
+  else if (lPos == -1)
+    {
+      /* Seek past end. */
+      if (dirp->dd_handle != -1)
+	{
+	  _findclose (dirp->dd_handle);
+	}
+      dirp->dd_handle = -1;
+      dirp->dd_stat = -1;
+    }
+  else
+    {
+      /* Rewind and read forward to the appropriate index. */
+      rewinddir (dirp);
+
+      while ((dirp->dd_stat < lPos) && readdir (dirp))
+	;
+    }
+}