Home | History | Annotate | Line # | Download | only in common
devopen.c revision 1.12 
      1 /*	$NetBSD: devopen.c,v 1.12 1999/11/27 03:08:47 simonb Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Ralph Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)devopen.c	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 #include <stand.h>
     42 
     43 /*
     44  * Decode the string 'fname', open the device and return the remaining
     45  * file name if any.
     46  */
     47 int
     48 devopen(f, fname, file)
     49 	struct open_file *f;
     50 	const char *fname;
     51 	char **file;	/* out */
     52 {
     53 	register const char *cp;
     54 	register char *ncp;
     55 	register struct devsw *dp;
     56 	register int c, i;
     57 	int ctlr = 0, unit = 0, part = 0;
     58 	char namebuf[20];
     59 	int rc;
     60 
     61 	cp = fname;
     62 	ncp = namebuf;
     63 
     64 	/* look for a string like '5/rz0/netbsd' or '5/rz3f/netbsd */
     65 	if ((c = *cp) >= '0' && c <= '9') {
     66 		ctlr = c - '0';
     67 		/* skip the '/' */
     68 		if (*++cp != '/')
     69 			return (ENXIO);
     70 		cp++;
     71 		while ((c = *cp) != '\0') {
     72 			if (c == '/')
     73 				break;
     74 			if (c >= '0' && c <= '9') {
     75 				/* read unit number */
     76 				unit = c - '0';
     77 
     78 				/* look for a partition */
     79 				if ((c = *++cp) >= 'a' && c <= 'h') {
     80 					part = c - 'a';
     81 					c = *++cp;
     82 				}
     83 				if (c != '/')
     84 					return (ENXIO);
     85 				break;
     86 			}
     87 			if (ncp < namebuf + sizeof(namebuf) - 1)
     88 				*ncp++ = c;
     89 			cp++;
     90 		}
     91 	} else {
     92 		/* expect a string like 'rz(0,0,0)netbsd' */
     93 		while ((c = *cp) != '\0') {
     94 			if (c == '(') {
     95 				cp++;
     96 				break;
     97 			}
     98 			if (ncp < namebuf + sizeof(namebuf) - 1)
     99 				*ncp++ = c;
    100 			cp++;
    101 		}
    102 
    103 		/* get controller number */
    104 		if ((c = *cp) >= '0' && c <= '9') {
    105 			ctlr = c - '0';
    106 			c = *++cp;
    107 		}
    108 
    109 		if (c == ',') {
    110 			/* get SCSI device number */
    111 			if ((c = *++cp) >= '0' && c <= '9') {
    112 				unit = c - '0';
    113 				c = *++cp;
    114 			}
    115 
    116 			if (c == ',') {
    117 				/* get partition number */
    118 				if ((c = *++cp) >= '0' && c <= '9') {
    119 					part = c - '0';
    120 					c = *++cp;
    121 				}
    122 			}
    123 		}
    124 		if (c != ')')
    125 			return (ENXIO);
    126 		cp++;
    127 	}
    128 	*ncp = '\0';
    129 
    130 #ifdef LIBSA_SINGLE_DEVICE
    131 	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
    132 #else
    133 #ifdef BOOTRZ	/* First stage disk boot loader only knows rz devices */
    134 	if (strcmp (namebuf, "rz")) {
    135 		printf ("Unknown device: %s\n", namebuf);
    136 		return ENXIO;
    137 	}
    138 	dp = devsw;
    139 	i = 0;
    140 #else
    141 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    142 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    143 			goto fnd;
    144 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    145 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    146 		if (dp->dv_name)
    147 			printf(" %s", dp->dv_name);
    148 	printf("\n");
    149 	return (ENXIO);
    150 
    151 fnd:
    152 #endif
    153 	rc = (dp->dv_open)(f, ctlr, unit, part);
    154 #endif
    155 	if (rc)
    156 		return (rc);
    157 
    158 #ifndef LIBSA_SINGLE_DEVICE
    159 	f->f_dev = dp;
    160 #endif
    161 	if (file && *cp != '\0')
    162 		*file = (char *)cp;	/* XXX */
    163 	return (0);
    164 }
    165