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devopen.c revision 1.4.36.1 
      1 /* $NetBSD: devopen.c,v 1.4.36.1 2014/08/10 06:54:07 tls 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)devopen.c	8.1 (Berkeley) 6/10/93
     35  */
     36 
     37 #include <lib/libsa/stand.h>
     38 
     39 /*
     40  * Decode the string 'fname', open the device and return the remaining
     41  * file name if any.
     42  */
     43 int
     44 devopen(struct open_file *f, const char *fname, char **file)
     45 	/* file:	 out */
     46 {
     47 	register char *cp;
     48 	register struct devsw *dp;
     49 #if 0
     50 	register char *ncp;
     51 	register int c, i;
     52 	char namebuf[20];
     53 #endif
     54 	int ctlr = 0, unit = 0, part = 0;
     55 	int rc;
     56 
     57 	cp = (char *)fname;
     58 #if 0
     59 	ncp = namebuf;
     60 
     61 	/* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */
     62 	if ((c = *cp) >= '0' && c <= '9') {
     63 		ctlr = c - '0';
     64 		/* skip the '/' */
     65 		if (*++cp != '/')
     66 			return (ENXIO);
     67 		cp++;
     68 		while ((c = *cp) != '\0') {
     69 			if (c == '/')
     70 				break;
     71 			if (c >= '0' && c <= '9') {
     72 				/* read unit number */
     73 				unit = c - '0';
     74 
     75 				/* look for a partition */
     76 				if ((c = *++cp) >= 'a' && c <= 'h') {
     77 					part = c - 'a';
     78 					c = *++cp;
     79 				}
     80 				if (c != '/')
     81 					return (ENXIO);
     82 				break;
     83 			}
     84 			if (ncp < namebuf + sizeof(namebuf) - 1)
     85 				*ncp++ = c;
     86 			cp++;
     87 		}
     88 		*ncp = '\0';
     89 	/*
     90 	 * XXX
     91 	 * pulling strchr from the C library, should pull from libkern.
     92 	 */
     93 	} else if (strchr(cp, '(')) {
     94 		/* expect a string like 'rz(0,0,0)vmunix' */
     95 		while ((c = *cp) != '\0') {
     96 			if (c == '(') {
     97 				cp++;
     98 				break;
     99 			}
    100 			if (ncp < namebuf + sizeof(namebuf) - 1)
    101 				*ncp++ = c;
    102 			cp++;
    103 		}
    104 
    105 		/* get controller number */
    106 		if ((c = *cp) >= '0' && c <= '9') {
    107 			ctlr = c - '0';
    108 			c = *++cp;
    109 		}
    110 
    111 		if (c == ',') {
    112 			/* get SCSI device number */
    113 			if ((c = *++cp) >= '0' && c <= '9') {
    114 				unit = c - '0';
    115 				c = *++cp;
    116 			}
    117 
    118 			if (c == ',') {
    119 				/* get partition number */
    120 				if ((c = *++cp) >= '0' && c <= '9') {
    121 					part = c - '0';
    122 					c = *++cp;
    123 				}
    124 			}
    125 		}
    126 		if (c != ')')
    127 			return (ENXIO);
    128 		cp++;
    129 		*ncp = '\0';
    130 	} else {
    131 #endif
    132 		dp = devsw;
    133 		ctlr = unit = part = 0;
    134 		goto fnd;
    135 #if 0
    136 	}
    137 
    138 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    139 		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
    140 			goto fnd;
    141 	printf("Unknown device '%s'\nKnown devices are:", namebuf);
    142 	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
    143 		if (dp->dv_name)
    144 			printf(" %s", dp->dv_name);
    145 	printf("\n");
    146 	return (ENXIO);
    147 #endif
    148 
    149 fnd:
    150 	rc = (dp->dv_open)(f, ctlr, unit, part);
    151 	if (rc)
    152 		return (rc);
    153 
    154 	f->f_dev = dp;
    155 	if (file && *cp != '\0')
    156 		*file = cp;
    157 	return (0);
    158 }
    159