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fsutil.c revision 1.3 
      1 /*	$NetBSD: fsutil.c,v 1.3 1996/10/22 16:57:51 christos 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 #ifndef lint
     36 static char rcsid[] = "$NetBSD: fsutil.c,v 1.3 1996/10/22 16:57:51 christos Exp $";
     37 #endif /* not lint */
     38 
     39 #include <stdio.h>
     40 #include <string.h>
     41 #include <stdlib.h>
     42 #if __STDC__
     43 #include <stdarg.h>
     44 #else
     45 #include <varargs.h>
     46 #endif
     47 #include <errno.h>
     48 #include <fstab.h>
     49 #include <err.h>
     50 
     51 #include <sys/types.h>
     52 #include <sys/stat.h>
     53 
     54 #include "fsutil.h"
     55 
     56 static const char *dev = NULL;
     57 static int hot = 0;
     58 static int preen = 0;
     59 
     60 extern char *__progname;
     61 
     62 static void vmsg __P((int, const char *, va_list));
     63 
     64 void
     65 setcdevname(cd, pr)
     66 	const char *cd;
     67 	int pr;
     68 {
     69 	dev = cd;
     70 	preen = pr;
     71 }
     72 
     73 const char *
     74 cdevname()
     75 {
     76 	return dev;
     77 }
     78 
     79 int
     80 hotroot()
     81 {
     82 	return hot;
     83 }
     84 
     85 /*VARARGS*/
     86 void
     87 #if __STDC__
     88 errexit(const char *fmt, ...)
     89 #else
     90 errexit(va_alist)
     91 	va_dcl
     92 #endif
     93 {
     94 	va_list ap;
     95 
     96 #if __STDC__
     97 	va_start(ap, fmt);
     98 #else
     99 	const char *fmt;
    100 
    101 	va_start(ap);
    102 	fmt = va_arg(ap, const char *);
    103 #endif
    104 	(void) vfprintf(stderr, fmt, ap);
    105 	va_end(ap);
    106 	exit(8);
    107 }
    108 
    109 static void
    110 vmsg(fatal, fmt, ap)
    111 	int fatal;
    112 	const char *fmt;
    113 	va_list ap;
    114 {
    115 	if (!fatal && preen)
    116 		(void) printf("%s: ", dev);
    117 
    118 	(void) vprintf(fmt, ap);
    119 
    120 	if (fatal && preen)
    121 		(void) printf("\n");
    122 
    123 	if (fatal && preen) {
    124 		(void) printf(
    125 		    "%s: UNEXPECTED INCONSISTENCY; RUN %s MANUALLY.\n",
    126 		    dev, __progname);
    127 		exit(8);
    128 	}
    129 }
    130 
    131 /*VARARGS*/
    132 void
    133 #if __STDC__
    134 pfatal(const char *fmt, ...)
    135 #else
    136 pfatal(va_alist)
    137 	va_dcl
    138 #endif
    139 {
    140 	va_list ap;
    141 
    142 #if __STDC__
    143 	va_start(ap, fmt);
    144 #else
    145 	const char *fmt;
    146 
    147 	va_start(ap);
    148 	fmt = va_arg(ap, const char *);
    149 #endif
    150 	vmsg(1, fmt, ap);
    151 	va_end(ap);
    152 }
    153 
    154 /*VARARGS*/
    155 void
    156 #if __STDC__
    157 pwarn(const char *fmt, ...)
    158 #else
    159 pwarn(va_alist)
    160 	va_dcl
    161 #endif
    162 {
    163 	va_list ap;
    164 #if __STDC__
    165 	va_start(ap, fmt);
    166 #else
    167 	const char *fmt;
    168 
    169 	va_start(ap);
    170 	fmt = va_arg(ap, const char *);
    171 #endif
    172 	vmsg(0, fmt, ap);
    173 	va_end(ap);
    174 }
    175 
    176 void
    177 perror(s)
    178 	const char *s;
    179 {
    180 	pfatal("%s (%s)", s, strerror(errno));
    181 }
    182 
    183 void
    184 #if __STDC__
    185 panic(const char *fmt, ...)
    186 #else
    187 panic(va_alist)
    188 	va_dcl
    189 #endif
    190 {
    191 	va_list ap;
    192 
    193 #if __STDC__
    194 	va_start(ap, fmt);
    195 #else
    196 	const char *fmt;
    197 
    198 	va_start(ap);
    199 	fmt = va_arg(ap, const char *);
    200 #endif
    201 	vmsg(1, fmt, ap);
    202 	va_end(ap);
    203 	exit(8);
    204 }
    205 
    206 char *
    207 unrawname(name)
    208 	char *name;
    209 {
    210 	char *dp;
    211 	struct stat stb;
    212 
    213 	if ((dp = strrchr(name, '/')) == 0)
    214 		return (name);
    215 	if (stat(name, &stb) < 0)
    216 		return (name);
    217 	if (!S_ISCHR(stb.st_mode))
    218 		return (name);
    219 	if (dp[1] != 'r')
    220 		return (name);
    221 	(void)strcpy(&dp[1], &dp[2]);
    222 	return (name);
    223 }
    224 
    225 char *
    226 rawname(name)
    227 	char *name;
    228 {
    229 	static char rawbuf[32];
    230 	char *dp;
    231 
    232 	if ((dp = strrchr(name, '/')) == 0)
    233 		return (0);
    234 	*dp = 0;
    235 	(void)strcpy(rawbuf, name);
    236 	*dp = '/';
    237 	(void)strcat(rawbuf, "/r");
    238 	(void)strcat(rawbuf, &dp[1]);
    239 	return (rawbuf);
    240 }
    241 
    242 char *
    243 blockcheck(origname)
    244 	char *origname;
    245 {
    246 	struct stat stslash, stblock, stchar;
    247 	char *newname, *raw;
    248 	struct fstab *fsp;
    249 	int retried = 0;
    250 
    251 	hot = 0;
    252 	if (stat("/", &stslash) < 0) {
    253 		perror("/");
    254 		printf("Can't stat root\n");
    255 		return (origname);
    256 	}
    257 	newname = origname;
    258 retry:
    259 	if (stat(newname, &stblock) < 0) {
    260 		perror(newname);
    261 		printf("Can't stat %s\n", newname);
    262 		return (origname);
    263 	}
    264 	if (S_ISBLK(stblock.st_mode)) {
    265 		if (stslash.st_dev == stblock.st_rdev)
    266 			hot++;
    267 		raw = rawname(newname);
    268 		if (stat(raw, &stchar) < 0) {
    269 			perror(raw);
    270 			printf("Can't stat %s\n", raw);
    271 			return (origname);
    272 		}
    273 		if (S_ISCHR(stchar.st_mode)) {
    274 			return (raw);
    275 		} else {
    276 			printf("%s is not a character device\n", raw);
    277 			return (origname);
    278 		}
    279 	} else if (S_ISCHR(stblock.st_mode) && !retried) {
    280 		newname = unrawname(newname);
    281 		retried++;
    282 		goto retry;
    283 	} else if ((fsp = getfsfile(newname)) != 0 && !retried) {
    284 		newname = fsp->fs_spec;
    285 		retried++;
    286 		goto retry;
    287 	}
    288 	/*
    289 	 * Not a block or character device, just return name and
    290 	 * let the user decide whether to use it.
    291 	 */
    292 	return (origname);
    293 }
    294 
    295 
    296 void *
    297 emalloc(s)
    298 	size_t s;
    299 {
    300 	void *p = malloc(s);
    301 	if (p == NULL)
    302 		err(1, "malloc failed");
    303 	return p;
    304 }
    305 
    306 
    307 void *
    308 erealloc(p, s)
    309 	void *p;
    310 	size_t s;
    311 {
    312 	p = realloc(p, s);
    313 	if (p == NULL)
    314 		err(1, "realloc failed");
    315 	return p;
    316 }
    317 
    318 
    319 char *
    320 estrdup(s)
    321 	const char *s;
    322 {
    323 	char *p = strdup(s);
    324 	if (p == NULL)
    325 		err(1, "strdup failed");
    326 	return p;
    327 }
    328