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fsutil.c revision 1.5 
      1 /*	$NetBSD: fsutil.c,v 1.5 1997/10/31 09:11:55 mycroft Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __RCSID("$NetBSD: fsutil.c,v 1.5 1997/10/31 09:11:55 mycroft Exp $");
     39 #endif /* not lint */
     40 
     41 #include <stdio.h>
     42 #include <string.h>
     43 #include <stdlib.h>
     44 #if __STDC__
     45 #include <stdarg.h>
     46 #else
     47 #include <varargs.h>
     48 #endif
     49 #include <errno.h>
     50 #include <fstab.h>
     51 #include <err.h>
     52 
     53 #include <sys/types.h>
     54 #include <sys/stat.h>
     55 
     56 #include "fsutil.h"
     57 
     58 static const char *dev = NULL;
     59 static int hot = 0;
     60 static int preen = 0;
     61 
     62 extern char *__progname;
     63 
     64 static void vmsg __P((int, const char *, va_list));
     65 
     66 void
     67 setcdevname(cd, pr)
     68 	const char *cd;
     69 	int pr;
     70 {
     71 	dev = cd;
     72 	preen = pr;
     73 }
     74 
     75 const char *
     76 cdevname()
     77 {
     78 	return dev;
     79 }
     80 
     81 int
     82 hotroot()
     83 {
     84 	return hot;
     85 }
     86 
     87 /*VARARGS*/
     88 void
     89 #if __STDC__
     90 errexit(const char *fmt, ...)
     91 #else
     92 errexit(va_alist)
     93 	va_dcl
     94 #endif
     95 {
     96 	va_list ap;
     97 
     98 #if __STDC__
     99 	va_start(ap, fmt);
    100 #else
    101 	const char *fmt;
    102 
    103 	va_start(ap);
    104 	fmt = va_arg(ap, const char *);
    105 #endif
    106 	(void) vfprintf(stderr, fmt, ap);
    107 	va_end(ap);
    108 	exit(8);
    109 }
    110 
    111 static void
    112 vmsg(fatal, fmt, ap)
    113 	int fatal;
    114 	const char *fmt;
    115 	va_list ap;
    116 {
    117 	if (!fatal && preen)
    118 		(void) printf("%s: ", dev);
    119 
    120 	(void) vprintf(fmt, ap);
    121 
    122 	if (fatal && preen)
    123 		(void) printf("\n");
    124 
    125 	if (fatal && preen) {
    126 		(void) printf(
    127 		    "%s: UNEXPECTED INCONSISTENCY; RUN %s MANUALLY.\n",
    128 		    dev, __progname);
    129 		exit(8);
    130 	}
    131 }
    132 
    133 /*VARARGS*/
    134 void
    135 #if __STDC__
    136 pfatal(const char *fmt, ...)
    137 #else
    138 pfatal(va_alist)
    139 	va_dcl
    140 #endif
    141 {
    142 	va_list ap;
    143 
    144 #if __STDC__
    145 	va_start(ap, fmt);
    146 #else
    147 	const char *fmt;
    148 
    149 	va_start(ap);
    150 	fmt = va_arg(ap, const char *);
    151 #endif
    152 	vmsg(1, fmt, ap);
    153 	va_end(ap);
    154 }
    155 
    156 /*VARARGS*/
    157 void
    158 #if __STDC__
    159 pwarn(const char *fmt, ...)
    160 #else
    161 pwarn(va_alist)
    162 	va_dcl
    163 #endif
    164 {
    165 	va_list ap;
    166 #if __STDC__
    167 	va_start(ap, fmt);
    168 #else
    169 	const char *fmt;
    170 
    171 	va_start(ap);
    172 	fmt = va_arg(ap, const char *);
    173 #endif
    174 	vmsg(0, fmt, ap);
    175 	va_end(ap);
    176 }
    177 
    178 void
    179 perror(s)
    180 	const char *s;
    181 {
    182 	pfatal("%s (%s)", s, strerror(errno));
    183 }
    184 
    185 void
    186 #if __STDC__
    187 panic(const char *fmt, ...)
    188 #else
    189 panic(va_alist)
    190 	va_dcl
    191 #endif
    192 {
    193 	va_list ap;
    194 
    195 #if __STDC__
    196 	va_start(ap, fmt);
    197 #else
    198 	const char *fmt;
    199 
    200 	va_start(ap);
    201 	fmt = va_arg(ap, const char *);
    202 #endif
    203 	vmsg(1, fmt, ap);
    204 	va_end(ap);
    205 	exit(8);
    206 }
    207 
    208 char *
    209 unrawname(name)
    210 	char *name;
    211 {
    212 	char *dp;
    213 	struct stat stb;
    214 
    215 	if ((dp = strrchr(name, '/')) == 0)
    216 		return (name);
    217 	if (stat(name, &stb) < 0)
    218 		return (name);
    219 	if (!S_ISCHR(stb.st_mode))
    220 		return (name);
    221 	if (dp[1] != 'r')
    222 		return (name);
    223 	(void)strcpy(&dp[1], &dp[2]);
    224 	return (name);
    225 }
    226 
    227 char *
    228 rawname(name)
    229 	char *name;
    230 {
    231 	static char rawbuf[32];
    232 	char *dp;
    233 
    234 	if ((dp = strrchr(name, '/')) == 0)
    235 		return (0);
    236 	*dp = 0;
    237 	(void)strcpy(rawbuf, name);
    238 	*dp = '/';
    239 	(void)strcat(rawbuf, "/r");
    240 	(void)strcat(rawbuf, &dp[1]);
    241 	return (rawbuf);
    242 }
    243 
    244 char *
    245 blockcheck(origname)
    246 	char *origname;
    247 {
    248 	struct stat stslash, stblock, stchar;
    249 	char *newname, *raw;
    250 	struct fstab *fsp;
    251 	int retried = 0;
    252 
    253 	hot = 0;
    254 	if (stat("/", &stslash) < 0) {
    255 		perror("/");
    256 		printf("Can't stat root\n");
    257 		return (origname);
    258 	}
    259 	newname = origname;
    260 retry:
    261 	if (stat(newname, &stblock) < 0) {
    262 		perror(newname);
    263 		printf("Can't stat %s\n", newname);
    264 		return (origname);
    265 	}
    266 	if (S_ISBLK(stblock.st_mode)) {
    267 		if (stslash.st_dev == stblock.st_rdev)
    268 			hot++;
    269 		raw = rawname(newname);
    270 		if (stat(raw, &stchar) < 0) {
    271 			perror(raw);
    272 			printf("Can't stat %s\n", raw);
    273 			return (origname);
    274 		}
    275 		if (S_ISCHR(stchar.st_mode)) {
    276 			return (raw);
    277 		} else {
    278 			printf("%s is not a character device\n", raw);
    279 			return (origname);
    280 		}
    281 	} else if (S_ISCHR(stblock.st_mode) && !retried) {
    282 		newname = unrawname(newname);
    283 		retried++;
    284 		goto retry;
    285 	} else if ((fsp = getfsfile(newname)) != 0 && !retried) {
    286 		newname = fsp->fs_spec;
    287 		retried++;
    288 		goto retry;
    289 	}
    290 	/*
    291 	 * Not a block or character device, just return name and
    292 	 * let the user decide whether to use it.
    293 	 */
    294 	return (origname);
    295 }
    296 
    297 
    298 void *
    299 emalloc(s)
    300 	size_t s;
    301 {
    302 	void *p;
    303 
    304 	p = malloc(s);
    305 	if (p == NULL)
    306 		err(1, "malloc failed");
    307 	return (p);
    308 }
    309 
    310 
    311 void *
    312 erealloc(p, s)
    313 	void *p;
    314 	size_t s;
    315 {
    316 	void *q;
    317 
    318 	q = realloc(p, s);
    319 	if (q == NULL)
    320 		err(1, "realloc failed");
    321 	return (q);
    322 }
    323 
    324 
    325 char *
    326 estrdup(s)
    327 	const char *s;
    328 {
    329 	char *p;
    330 
    331 	p = strdup(s);
    332 	if (p == NULL)
    333 		err(1, "strdup failed");
    334 	return (p);
    335 }
    336