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devopen.c revision 1.3 
      1 /*	$NetBSD: devopen.c,v 1.3 2006/04/10 18:40:06 garbled 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(char *);
     37 int devlookup(char *);
     38 int devparse(const char *, int *, int *, int *, int *, int *, char **);
     39 
     40 int
     41 atoi(char *cp)
     42 {
     43 	int val = 0;
     44 
     45 	while (isdigit(*cp))
     46 		val = val * 10 + (*cp++ - '0');
     47 	return (val);
     48 }
     49 
     50 int
     51 devlookup(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(const char *fname, int *dev, int *adapt, int *ctlr, int *unit,
     74 	int *part, char **file)
     75 {
     76 	int argc, flag;
     77 	char *s, *args[3];
     78 	extern char nametmp[];
     79 
     80 	/* get device name and make lower case */
     81 	strcpy(nametmp, (char *)fname);
     82 	for (s = nametmp; *s && *s != '('; s++)
     83 		if (isupper(*s)) *s = tolower(*s);
     84 
     85 	if (*s == '(') {
     86 		/* lookup device and get index */
     87 		*s = NULL;
     88 		if ((*dev = devlookup(nametmp)) < 0)
     89 		    goto baddev;
     90 
     91 		/* tokenize device ident */
     92 		for (++s, flag = 0, argc = 0; *s && *s != ')'; s++) {
     93 			if (*s != ',') {
     94 				if (!flag) {
     95 					flag++;
     96 					args[argc++] = s;
     97 				}
     98 			} else {
     99 				if (flag) {
    100 					*s = NULL;
    101 					flag = 0;
    102 				}
    103 			}
    104 		}
    105 		if (*s == ')')
    106 			*s = NULL;
    107 
    108 		switch (argc) {
    109 		case 3:
    110 		    *part = atoi(args[2]);
    111 		    /* FALL THROUGH */
    112 		case 2:
    113 		    *unit = atoi(args[1]);
    114 		    /* FALL THROUGH */
    115 		case 1:
    116 		    *ctlr = atoi(args[0]);
    117 		    break;
    118 		}
    119 		*file = ++s;
    120 	} else {
    121 		/* no device present */
    122 		*file = (char *)fname;
    123 	}
    124 	return (0);
    125 
    126 baddev:
    127 	return (EINVAL);
    128 }
    129 
    130 int
    131 devopen(struct open_file *f, const char *fname, char **file)
    132 {
    133 	int error;
    134 	int dev = 0, ctlr = 0, unit = 0, part = 0;
    135 	int adapt = 0;
    136 	struct devsw *dp = &devsw[0];
    137 
    138 	if ((error =
    139 	    devparse(fname, &dev, &adapt, &ctlr, &unit, &part, file)) != 0)
    140 		return (error);
    141 
    142 	dp = &devsw[dev];
    143 	if (!dp->dv_open)
    144 		return (ENODEV);
    145 
    146 	f->f_dev = dp;
    147 	if ((error = (*dp->dv_open)(f, ctlr, unit, part)) == 0)
    148 		return (0);
    149 
    150 	printf("%s(%d,%d,%d): %s\n", devsw[dev].dv_name,
    151 		ctlr, unit, part, strerror(error));
    152 
    153 	return (error);
    154 }
    155