65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <limits.h>
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#include <hurd.h>
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/* Read the contents of the symbolic link PATH into no more than
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LEN bytes of BUF. The contents are not null-terminated.
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Returns the number of characters read, or -1 for errors. */
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int
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DEFUN(__readlink, (path, buf, len),
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CONST char *path AND char *buf AND size_t len)
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{
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error_t err;
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file_t file;
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file = __path_lookup (path, FS_LOOKUP_READ|FS_LOOKUP_NOTRANS, 0);
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if (file == MACH_PORT_NULL)
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return -1;
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p = buf;
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while (len > 0)
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{
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char *s = p;
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size_t nread = len;
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err = __io_read (file, &s, &nread);
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if (err)
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break;
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if (nread == 0)
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break;
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if (s != p)
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{
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memcpy (p, s, nread);
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__vm_deallocate (__mach_task_self (), s, nread);
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}
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len -= nread;
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p += nread;
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}
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__mach_port_deallocate (__mach_task_self (), file);
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if (err)
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return __hurd_fail (err);
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return p - buf;
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}
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