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devopen.c revision 1.2 
      1 /*	$NetBSD: devopen.c,v 1.2 2001/05/28 15:53:51 kleink 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 <lib/libsa/stand.h>
     32 #include <lib/libkern/libkern.h>
     33 
     34 #define	ispart(c)	((c) >= 'a' && (c) <= 'h')
     35 
     36 int atoi __P((char *));
     37 int devlookup __P((char *));
     38 int devparse __P((const char *, int *, int *, int *, int *, int *, char **));
     39 
     40 int
     41 atoi(cp)
     42 	char *cp;
     43 {
     44 	int val = 0;
     45 
     46 	while (isdigit(*cp))
     47 		val = val * 10 + (*cp++ - '0');
     48 	return (val);
     49 }
     50 
     51 int
     52 devlookup(d)
     53 	char *d;
     54 {
     55 	struct devsw *dp = devsw;
     56 	int i;
     57 
     58 	for (i = 0; i < ndevs; i++, dp++)
     59 		if (dp->dv_name && strcmp(dp->dv_name, d) == 0)
     60 			return (i);
     61 
     62 	printf("No such device - Configured devices are:\n");
     63 	for (dp = devsw, i = 0; i < ndevs; i++, dp++)
     64 		if (dp->dv_name)
     65 			printf(" %s", dp->dv_name);
     66 	printf("\n");
     67 	return (-1);
     68 }
     69 
     70 /*
     71  * Parse a device spec in one of two forms.
     72  *   dev(ctlr, unit, part)file
     73  */
     74 int
     75 devparse(fname, dev, adapt, ctlr, unit, part, file)
     76 	const char *fname;
     77 	int *dev;
     78 	int *adapt;
     79 	int *ctlr;
     80 	int *unit;
     81 	int *part;
     82 	char **file;
     83 {
     84 	int argc, flag;
     85 	char *s, *args[3];
     86 	extern char nametmp[];
     87 
     88 	/* get device name and make lower case */
     89 	strcpy(nametmp, (char *)fname);
     90 	for (s = nametmp; *s && *s != '('; s++)
     91 		if (isupper(*s)) *s = tolower(*s);
     92 
     93 	if (*s == '(') {
     94 		/* lookup device and get index */
     95 		*s = NULL;
     96 		if ((*dev = devlookup(nametmp)) < 0)
     97 		    goto baddev;
     98 
     99 		/* tokenize device ident */
    100 		for (++s, flag = 0, argc = 0; *s && *s != ')'; s++) {
    101 			if (*s != ',') {
    102 				if (!flag) {
    103 					flag++;
    104 					args[argc++] = s;
    105 				}
    106 			} else {
    107 				if (flag) {
    108 					*s = NULL;
    109 					flag = 0;
    110 				}
    111 			}
    112 		}
    113 		if (*s == ')')
    114 			*s = NULL;
    115 
    116 		switch (argc) {
    117 		case 3:
    118 		    *part = atoi(args[2]);
    119 		    /* FALL THROUGH */
    120 		case 2:
    121 		    *unit = atoi(args[1]);
    122 		    /* FALL THROUGH */
    123 		case 1:
    124 		    *ctlr = atoi(args[0]);
    125 		    break;
    126 		}
    127 		*file = ++s;
    128 	} else {
    129 		/* no device present */
    130 		*file = (char *)fname;
    131 	}
    132 	return (0);
    133 
    134 baddev:
    135 	return (EINVAL);
    136 }
    137 
    138 int
    139 devopen(f, fname, file)
    140 	struct open_file *f;
    141 	const char *fname;
    142 	char **file;
    143 {
    144 	int error;
    145 	int dev = 0, ctlr = 0, unit = 0, part = 0;
    146 	int adapt = 0;
    147 	struct devsw *dp = &devsw[0];
    148 
    149 	if ((error =
    150 	    devparse(fname, &dev, &adapt, &ctlr, &unit, &part, file)) != 0)
    151 		return (error);
    152 
    153 	dp = &devsw[dev];
    154 	if (!dp->dv_open)
    155 		return (ENODEV);
    156 
    157 	f->f_dev = dp;
    158 	if ((error = (*dp->dv_open)(f, ctlr, unit, part)) == 0)
    159 		return (0);
    160 
    161 	printf("%s(%d,%d,%d): %s\n", devsw[dev].dv_name,
    162 		ctlr, unit, part, strerror(error));
    163 
    164 	return (error);
    165 }
    166