/contrib/cvs/lib/xgetwd.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 67 lines · 39 code · 12 blank · 16 comment · 6 complexity · 1773cc33c18ebc1534251994bb32c39a MD5 · raw file
- /* xgetwd.c -- return current directory with unlimited length
- Copyright (C) 1992, 1997 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. */
- /* Derived from xgetcwd.c in e.g. the GNU sh-utils. */
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include "system.h"
- #include <stdio.h>
- #include <errno.h>
- #ifndef errno
- extern int errno;
- #endif
- #include <sys/types.h>
- /* Amount by which to increase buffer size when allocating more space. */
- #define PATH_INCR 32
- char *xmalloc ();
- char *xrealloc ();
- /* Return the current directory, newly allocated, arbitrarily long.
- Return NULL and set errno on error. */
- char *
- xgetwd ()
- {
- char *cwd;
- char *ret;
- unsigned path_max;
- errno = 0;
- path_max = (unsigned) PATH_MAX;
- path_max += 2; /* The getcwd docs say to do this. */
- cwd = 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;
- }