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TP-Link_Archer-XR500v/EN7526G_3.18Kernel_SDK/apps/public/ftpd/xgetcwd.c
2024-07-22 01:58:46 -03:00

80 lines
2.0 KiB
C
Executable File

/* xgetcwd.c -- return current directory with unlimited length
Copyright (C) 1992, 1996 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 errno
extern int errno;
#endif
#include <sys/types.h>
#include "pathmax.h"
#if HAVE_GETCWD
extern char *getcwd __P ((char *buf, size_t size));
#else
extern char *getwd __P ((char *buf, size_t size));
# define getcwd(Buf, Max) getwd (Buf)
#endif
/* Amount to increase buffer size by in each try. */
#define PATH_INCR 32
extern char *xmalloc __P ((size_t n));
extern char *xrealloc __P ((void *p, size_t s));
extern void free __P ((void *));
/* Return the current directory, newly allocated, arbitrarily long.
Return NULL and set errno on error. */
char *
xgetcwd (void)
{
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;
}