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fsutil.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 2000 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.1 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1990, 1993
 *    The Regents of the University of California.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <sys/cdefs.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <errno.h>
#include <fstab.h>
#include <err.h>

#include <sys/types.h>
#include <sys/stat.h>

#include "ext.h"
#include "fsutil.h"

static const char *dev = NULL;
static int hot = 0;
/*static int preen = 0;*/

extern char *__progname;

static void vmsg __P((int, const char *, va_list));

void
setcdevname(const char *cd)
{
      dev = cd;
}

const char *
cdevname()
{
      return dev;
}

int
hotroot()
{
      return hot;
}

/*VARARGS*/
void
#if __STDC__
errexit(const char *fmt, ...)
#else
errexit(va_alist)
      va_dcl
#endif
{
      va_list ap;

#if __STDC__
      va_start(ap, fmt);
#else
      const char *fmt;

      va_start(ap);
      fmt = va_arg(ap, const char *);
#endif
      (void) vfprintf(stderr, fmt, ap);
      va_end(ap);
      exit(8);
}

static void
vmsg(fatal, fmt, ap)
      int fatal;
      const char *fmt;
      va_list ap;
{
      if (!fatal && preen)
            (void) printf("%s: ", dev);

      if (!quiet)
            (void) vprintf(fmt, ap);

      if (fatal && preen)
            (void) printf("\n");

      if (fatal && preen) {
            (void) printf(
                "%s: UNEXPECTED INCONSISTENCY; RUN %s MANUALLY.\n",
                dev, __progname);
            exit(8);
      }
}

/*VARARGS*/
void
#if __STDC__
pfatal(const char *fmt, ...)
#else
pfatal(va_alist)
      va_dcl
#endif
{
      va_list ap;

#if __STDC__
      va_start(ap, fmt);
#else
      const char *fmt;

      va_start(ap);
      fmt = va_arg(ap, const char *);
#endif
      vmsg(1, fmt, ap);
      va_end(ap);
}

/*VARARGS*/
void
#if __STDC__
pwarn(const char *fmt, ...)
#else
pwarn(va_alist)
      va_dcl
#endif
{
      va_list ap;
#if __STDC__
      va_start(ap, fmt);
#else
      const char *fmt;

      va_start(ap);
      fmt = va_arg(ap, const char *);
#endif
      vmsg(0, fmt, ap);
      va_end(ap);
}

#ifdef __APPLE__
__private_extern__
#endif
void
perr(s)
      const char *s;
{
      pfatal("%s (%s)\n", s, strerror(errno));
}

#ifdef __APPLE__
__private_extern__
#endif
void
#if __STDC__
panic(const char *fmt, ...)
#else
panic(va_alist)
      va_dcl
#endif
{
      va_list ap;

#if __STDC__
      va_start(ap, fmt);
#else
      const char *fmt;

      va_start(ap);
      fmt = va_arg(ap, const char *);
#endif
      vmsg(1, fmt, ap);
      va_end(ap);
      exit(8);
}

const char *
unrawname(name)
      const char *name;
{
      static char unrawbuf[32];
      const char *dp;
      struct stat stb;

      if ((dp = strrchr(name, '/')) == 0)
            return (name);
      if (stat(name, &stb) < 0)
            return (name);
      if (!S_ISCHR(stb.st_mode))
            return (name);
      if (dp[1] != 'r')
            return (name);
      (void)snprintf(unrawbuf, 32, "%.*s/%s", (int)(dp - name), name, dp + 2);
      return (unrawbuf);
}

const char *
rawname(name)
      const char *name;
{
      static char rawbuf[32];
      const char *dp;

      if ((dp = strrchr(name, '/')) == 0)
            return (0);
      (void)snprintf(rawbuf, 32, "%.*s/r%s", (int)(dp - name), name, dp + 1);
      return (rawbuf);
}

const char *
blockcheck(origname)
      const char *origname;
{
      struct stat stslash, stblock, stchar;
      const char *newname, *raw;
      struct fstab *fsp;
      int retried = 0;

      hot = 0;
      if (stat("/", &stslash) < 0) {
            perr("/");
            printf("Can't stat root\n");
            return (origname);
      }
      newname = origname;
retry:
      if (stat(newname, &stblock) < 0) {
            perr(newname);
            printf("Can't stat %s\n", newname);
            return (origname);
      }
      if (S_ISBLK(stblock.st_mode)) {
            if (stslash.st_dev == stblock.st_rdev)
                  hot++;
            raw = rawname(newname);
            if (stat(raw, &stchar) < 0) {
                  perr(raw);
                  printf("Can't stat %s\n", raw);
                  return (origname);
            }
            if (S_ISCHR(stchar.st_mode)) {
                  return (raw);
            } else {
                  printf("%s is not a character device\n", raw);
                  return (origname);
            }
      } else if (S_ISCHR(stblock.st_mode) && !retried) {
            newname = unrawname(newname);
            retried++;
            goto retry;
      } else if ((fsp = getfsfile(newname)) != 0 && !retried) {
            newname = fsp->fs_spec;
            retried++;
            goto retry;
      }
      /*
       * Not a block or character device, just return name and
       * let the user decide whether to use it.
       */
      return (origname);
}


void *
emalloc(s)
      size_t s;
{
      void *p;

      p = malloc(s);
      if (p == NULL)
            err(1, "malloc failed");
      return (p);
}


void *
erealloc(p, s)
      void *p;
      size_t s;
{
      void *q;

      q = realloc(p, s);
      if (q == NULL)
            err(1, "realloc failed");
      return (q);
}


char *
estrdup(s)
      const char *s;
{
      char *p;

      p = strdup(s);
      if (p == NULL)
            err(1, "strdup failed");
      return (p);
}

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