386BSD 0.1 development

Work on file usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/xgetcwd.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1

diff --git a/usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/xgetcwd.c b/usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/xgetcwd.c
new file mode 100644 (file)
index 0000000..d1e0330
--- /dev/null
+++ b/usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/xgetcwd.c
@@ -0,0 +1,105 @@
+/* xgetcwd.c -- return current directory with unlimited length
+   Copyright (C) 1992 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 2, 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Written by David MacKenzie, djm@gnu.ai.mit.edu. */
+
+#include <errno.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#if defined(_POSIX_VERSION) || defined(STDC_HEADERS) || defined(HAVE_LIMITS_H)
+#include <limits.h>
+#endif /* !_POSIX_VERSION && !STDC_HEADERS && !HAVE_LIMITS_H */
+
+#ifndef _POSIX_SOURCE
+#include <sys/param.h>
+#endif
+
+#ifndef _POSIX_PATH_MAX
+#define _POSIX_PATH_MAX 255
+#endif
+
+#ifndef PATH_MAX
+#ifdef _PC_PATH_MAX
+#define PATH_MAX pathconf ("/", _PC_PATH_MAX)
+#else /* !_PC_PATH_MAX */
+#ifdef MAXPATHLEN
+#define PATH_MAX MAXPATHLEN
+#else /* not MAXPATHLEN */
+#define PATH_MAX _POSIX_PATH_MAX
+#endif /* MAXPATHLEN */
+#endif /* !_PC_PATH_MAX */
+#endif /* !PATH_MAX */
+
+#if !defined(_POSIX_VERSION) && !defined(USG)
+char *getwd ();
+#define getcwd(buf, max) getwd (buf)
+#else
+char *getcwd ();
+#endif
+
+/* Amount to increase buffer size by in each try. */
+#define PATH_INCR 32
+
+char *xmalloc ();
+char *xrealloc ();
+
+/* Return the current directory, newly allocated, arbitrarily long.
+   Return NULL and set errno on error. */
+
+char *
+xgetcwd ()
+{
+  char *cwd;
+  char *ret;
+  long path_max;
+
+  errno = 0;
+#ifdef _POSIX_VERSION
+  path_max = PATH_MAX;
+  if (path_max < 0)
+    {
+      if (errno)
+       return NULL;
+      path_max = _POSIX_PATH_MAX;
+    }
+#else /* !_POSIX_VERSION */
+  path_max = PATH_MAX;
+#endif /* !_POSIX_VERSION */
+  path_max += 2;               /* The getcwd docs say to do this. */
+
+  cwd = (char *) xmalloc (path_max);
+
+  errno = 0;
+  while ((ret = getcwd (cwd, path_max)) == NULL && errno == ERANGE)
+    {
+      path_max += PATH_INCR;
+      cwd = xrealloc (cwd, path_max);
+      errno = 0;
+    }
+
+  if (ret == NULL)
+    {
+      int save_errno = errno;
+      free (cwd);
+      errno = save_errno;
+      return NULL;
+    }
+  return cwd;
+}