Home | History | Annotate | Line # | Download | only in boot
devopen.c revision 1.4 
      1 /*	$NetBSD: devopen.c,v 1.4 2002/04/08 16:05:58 sakamoto Exp $	*/
      2 
      3 /*-
      4  *  Copyright (c) 1993 John Brezak
      5  *  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. The name of the author may not be used to endorse or promote products
     16  *     derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED.	IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <stand.h>
     32 #include <lib/libkern/libkern.h>
     33 #include <sys/param.h>
     34 #include <sys/reboot.h>
     35 
     36 #define	ispart(c)	((c) >= 'a' && (c) <= 'h')
     37 
     38 int
     39 atoi(cp)
     40 	char *cp;
     41 {
     42 	int val = 0;
     43 
     44 	while (isdigit(*cp))
     45 		val = val * 10 + (*cp++ - '0');
     46 	return (val);
     47 }
     48 
     49 int
     50 devlookup(d)
     51 	char *d;
     52 {
     53 	struct devsw *dp = devsw;
     54 	int i;
     55 
     56 	for (i = 0; i < ndevs; i++, dp++)
     57 		if (dp->dv_name && strcmp(dp->dv_name, d) == 0)
     58 			return (i);
     59 
     60 	printf("No such device - Configured devices are:\n");
     61 	for (dp = devsw, i = 0; i < ndevs; i++, dp++)
     62 		if (dp->dv_name)
     63 			printf(" %s", dp->dv_name);
     64 	printf("\n");
     65 	return (-1);
     66 }
     67 
     68 /*
     69  * Parse a device spec in one of two forms.
     70  *   dev(ctlr, unit, part)file
     71  */
     72 int
     73 devparse(fname, dev, adapt, ctlr, unit, part, file)
     74 	const char *fname;
     75 	int *dev;
     76 	int *adapt;
     77 	int *ctlr;
     78 	int *unit;
     79 	int *part;
     80 	char **file;
     81 {
     82 	int argc, flag;
     83 	char *s, *args[3];
     84 	extern char nametmp[];
     85 
     86 	/* get device name and make lower case */
     87 	strcpy(nametmp, (char *)fname);
     88 	for (s = nametmp; *s && *s != '('; s++)
     89 		if (isupper(*s)) *s = tolower(*s);
     90 
     91 	if (*s == '(') {
     92 		/* lookup device and get index */
     93 		*s = NULL;
     94 		if ((*dev = devlookup(nametmp, s - nametmp)) < 0)
     95 		    goto baddev;
     96 
     97 		/* tokenize device ident */
     98 		for (++s, flag = 0, argc = 0; *s && *s != ')'; s++) {
     99 			if (*s != ',') {
    100 				if (!flag) {
    101 					flag++;
    102 					args[argc++] = s;
    103 				}
    104 			} else {
    105 				if (flag) {
    106 					*s = NULL;
    107 					flag = 0;
    108 				}
    109 			}
    110 		}
    111 		if (*s == ')')
    112 			*s = NULL;
    113 
    114 		switch (argc) {
    115 		case 3:
    116 		    *part = atoi(args[2]);
    117 		    /* FALL THROUGH */
    118 		case 2:
    119 		    *unit = atoi(args[1]);
    120 		    /* FALL THROUGH */
    121 		case 1:
    122 		    *ctlr = atoi(args[0]);
    123 		    break;
    124 		}
    125 		*file = ++s;
    126 	} else {
    127 		/* no device present */
    128 		*file = (char *)fname;
    129 	}
    130 	return (0);
    131 
    132 baddev:
    133 	return (EINVAL);
    134 }
    135 
    136 int
    137 devopen(f, fname, file)
    138 	struct open_file *f;
    139 	const char *fname;
    140 	char **file;
    141 {
    142 	int error;
    143 	int dev = 0, ctlr = 0, unit = 0, part = 0;
    144 	int adapt = 0;
    145 	struct devsw *dp = &devsw[0];
    146 
    147 	if ((error =
    148 	    devparse(fname, &dev, &adapt, &ctlr, &unit, &part, file)) != 0)
    149 		return (error);
    150 
    151 	dp = &devsw[dev];
    152 	if (!dp->dv_open)
    153 		return (ENODEV);
    154 
    155 	f->f_dev = dp;
    156 	if ((error = (*dp->dv_open)(f, ctlr, unit, part)) == 0)
    157 		return (0);
    158 
    159 	printf("%s(%d,%d,%d): %s\n", devsw[dev].dv_name,
    160 		ctlr, unit, part, strerror(error));
    161 
    162 	return (error);
    163 }
    164