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devopen.c revision 1.3 
      1 /*	$NetBSD: devopen.c,v 1.3 1999/06/28 01:20:44 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 <sys/param.h>
     33 #include <sys/reboot.h>
     34 
     35 #define	ispart(c)	((c) >= 'a' && (c) <= 'h')
     36 
     37 int
     38 atoi(cp)
     39 	char *cp;
     40 {
     41 	int val = 0;
     42 
     43 	while (isdigit(*cp))
     44 		val = val * 10 + (*cp++ - '0');
     45 	return (val);
     46 }
     47 
     48 int
     49 devlookup(d)
     50 	char *d;
     51 {
     52 	struct devsw *dp = devsw;
     53 	int i;
     54 
     55 	for (i = 0; i < ndevs; i++, dp++)
     56 		if (dp->dv_name && strcmp(dp->dv_name, d) == 0)
     57 			return (i);
     58 
     59 	printf("No such device - Configured devices are:\n");
     60 	for (dp = devsw, i = 0; i < ndevs; i++, dp++)
     61 		if (dp->dv_name)
     62 			printf(" %s", dp->dv_name);
     63 	printf("\n");
     64 	return (-1);
     65 }
     66 
     67 /*
     68  * Parse a device spec in one of two forms.
     69  *   dev(ctlr, unit, part)file
     70  */
     71 int
     72 devparse(fname, dev, adapt, ctlr, unit, part, file)
     73 	const char *fname;
     74 	int *dev;
     75 	int *adapt;
     76 	int *ctlr;
     77 	int *unit;
     78 	int *part;
     79 	char **file;
     80 {
     81 	int argc, flag;
     82 	char *s, *args[3];
     83 	extern char nametmp[];
     84 
     85 	/* get device name and make lower case */
     86 	strcpy(nametmp, (char *)fname);
     87 	for (s = nametmp; *s && *s != '('; s++)
     88 		if (isupper(*s)) *s = tolower(*s);
     89 
     90 	if (*s == '(') {
     91 		/* lookup device and get index */
     92 		*s = NULL;
     93 		if ((*dev = devlookup(nametmp, s - nametmp)) < 0)
     94 		    goto baddev;
     95 
     96 		/* tokenize device ident */
     97 		for (++s, flag = 0, argc = 0; *s && *s != ')'; s++) {
     98 			if (*s != ',') {
     99 				if (!flag) {
    100 					flag++;
    101 					args[argc++] = s;
    102 				}
    103 			} else {
    104 				if (flag) {
    105 					*s = NULL;
    106 					flag = 0;
    107 				}
    108 			}
    109 		}
    110 		if (*s == ')')
    111 			*s = NULL;
    112 
    113 		switch (argc) {
    114 		case 3:
    115 		    *part = atoi(args[2]);
    116 		    /* FALL THROUGH */
    117 		case 2:
    118 		    *unit = atoi(args[1]);
    119 		    /* FALL THROUGH */
    120 		case 1:
    121 		    *ctlr = atoi(args[0]);
    122 		    break;
    123 		}
    124 		*file = ++s;
    125 	} else {
    126 		/* no device present */
    127 		*file = (char *)fname;
    128 	}
    129 	return (0);
    130 
    131 baddev:
    132 	return (EINVAL);
    133 }
    134 
    135 int
    136 devopen(f, fname, file)
    137 	struct open_file *f;
    138 	const char *fname;
    139 	char **file;
    140 {
    141 	int error;
    142 	int dev = 0, ctlr = 0, unit = 0, part = 0;
    143 	int adapt = 0;
    144 	struct devsw *dp = &devsw[0];
    145 
    146 	if ((error =
    147 	    devparse(fname, &dev, &adapt, &ctlr, &unit, &part, file)) != 0)
    148 		return (error);
    149 
    150 	dp = &devsw[dev];
    151 	if (!dp->dv_open)
    152 		return (ENODEV);
    153 
    154 	f->f_dev = dp;
    155 	if ((error = (*dp->dv_open)(f, ctlr, unit, part)) == 0)
    156 		return (0);
    157 
    158 	printf("%s(%d,%d,%d): %s\n", devsw[dev].dv_name,
    159 		ctlr, unit, part, strerror(error));
    160 
    161 	return (error);
    162 }
    163