88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
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/* xgetcwd.c -- return current directory with unlimited length
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Copyright (C) 1992, 1996, 2000, 2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include <sys/types.h>
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#if HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if HAVE_GETCWD
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char *getcwd ();
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#else
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# include "pathmax.h"
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# define INITIAL_BUFFER_SIZE (PATH_MAX + 1)
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char *getwd ();
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# define getcwd(Buf, Max) getwd (Buf)
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#endif
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#include "xalloc.h"
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/* Return the current directory, newly allocated, arbitrarily long.
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Return NULL and set errno on error. */
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char *
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xgetcwd ()
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{
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#if HAVE_GETCWD_NULL
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char *cwd = getcwd (NULL, 0);
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if (! cwd && errno == ENOMEM)
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xalloc_die ();
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return cwd;
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#else
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/* The initial buffer size for the working directory. A power of 2
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detects arithmetic overflow earlier, but is not required. */
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# ifndef INITIAL_BUFFER_SIZE
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# define INITIAL_BUFFER_SIZE 128
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# endif
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size_t buf_size = INITIAL_BUFFER_SIZE;
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while (1)
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{
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char *buf = xmalloc (buf_size);
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char *cwd = getcwd (buf, buf_size);
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int saved_errno;
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if (cwd)
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return cwd;
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saved_errno = errno;
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free (buf);
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if (saved_errno != ERANGE)
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return NULL;
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buf_size *= 2;
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if (buf_size == 0)
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xalloc_die ();
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}
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#endif
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}
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