/* $OpenBSD: opendev.c,v 1.7 2002/06/09 22:18:43 fgsch Exp $ */ /* * Copyright (c) 2000, Todd C. Miller. All rights reserved. * Copyright (c) 1996, Jason Downs. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <errno.h> #include <fcntl.h> #include <limits.h> #include <paths.h> #include <stdio.h> #include <string.h> #include "util.h" /* * This routine is a generic rewrite of the original code found in * disklabel(8). */ int opendev(path, oflags, dflags, realpath) char *path; int oflags; int dflags; char **realpath; { int fd; char *slash, *prefix; static char namebuf[PATH_MAX]; /* Initial state */ if (realpath) *realpath = path; fd = -1; errno = ENOENT; if (dflags & OPENDEV_BLCK) prefix = ""; /* block device */ else prefix = "r"; /* character device */ if ((slash = strchr(path, '/'))) fd = open(path, oflags); else if (dflags & OPENDEV_PART) { /* * First try raw partition (for removable drives) */ if (snprintf(namebuf, sizeof(namebuf), "%s%s%s%c", _PATH_DEV, prefix, path, 'a' + getrawpartition()) < sizeof(namebuf)) { fd = open(namebuf, oflags); if (realpath) *realpath = namebuf; } else errno = ENAMETOOLONG; } if (!slash && fd == -1 && errno == ENOENT) { if (snprintf(namebuf, sizeof(namebuf), "%s%s%s", _PATH_DEV, prefix, path) < sizeof(namebuf)) { fd = open(namebuf, oflags); if (realpath) *realpath = namebuf; } else errno = ENAMETOOLONG; } return (fd); }