?? xgetcwd.c
字號:
/* xgetcwd.c -- return current directory with unlimited length Copyright (C) 1992, 1996, 2000, 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *//* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */#if HAVE_CONFIG_H# include <config.h>#endif#include <stdio.h>#include <errno.h>#ifndef errnoextern int errno;#endif#include <sys/types.h>#if HAVE_STDLIB_H# include <stdlib.h>#endif#if HAVE_UNISTD_H# include <unistd.h>#endif#if HAVE_GETCWDchar *getcwd ();#else# include "pathmax.h"# define INITIAL_BUFFER_SIZE (PATH_MAX + 1)char *getwd ();# define getcwd(Buf, Max) getwd (Buf)#endif#include "xalloc.h"/* Return the current directory, newly allocated, arbitrarily long. Return NULL and set errno on error. */char *xgetcwd (){#if HAVE_GETCWD_NULL char *cwd = getcwd (NULL, 0); if (! cwd && errno == ENOMEM) xalloc_die (); return cwd;#else /* The initial buffer size for the working directory. A power of 2 detects arithmetic overflow earlier, but is not required. */# ifndef INITIAL_BUFFER_SIZE# define INITIAL_BUFFER_SIZE 128# endif size_t buf_size = INITIAL_BUFFER_SIZE; while (1) { char *buf = xmalloc (buf_size); char *cwd = getcwd (buf, buf_size); int saved_errno; if (cwd) return cwd; saved_errno = errno; free (buf); if (saved_errno != ERANGE) return NULL; buf_size *= 2; if (buf_size == 0) xalloc_die (); }#endif}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -