/*      $NetBSD: devopen.c,v 1.6 2022/04/30 03:41:05 rin Exp $  */

/*-
 *  Copyright (c) 1993 John Brezak
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>

#define ispart(c)       ((c) >= 'a' && (c) <= 'h')

int devlookup(char *);
int devparse(const char *, int *, int *, int *, int *, int *, char **);

int
devlookup(char *d)
{
        struct devsw *dp = devsw;
        int i;

        for (i = 0; i < ndevs; i++, dp++)
                if (dp->dv_name && strcmp(dp->dv_name, d) == 0)
                        return (i);

        printf("No such device - Configured devices are:\n");
        for (dp = devsw, i = 0; i < ndevs; i++, dp++)
                if (dp->dv_name)
                        printf(" %s", dp->dv_name);
        printf("\n");
        return (-1);
}

/*
 * Parse a device spec in one of two forms.
 *   dev(ctlr, unit, part)file
 */
int
devparse(const char *fname, int *dev, int *adapt, int *ctlr, int *unit,
        int *part, char **file)
{
        int argc, flag;
        char *s, *args[3];
        extern char nametmp[];

        /* get device name and make lower case */
        strcpy(nametmp, (char *)fname);
        for (s = nametmp; *s && *s != '('; s++)
                if (isupper(*s)) *s = tolower(*s);

        if (*s == '(') {
                /* lookup device and get index */
                *s = '\0';
                if ((*dev = devlookup(nametmp)) < 0)
                    goto baddev;

                /* tokenize device ident */
                for (++s, flag = 0, argc = 0; *s && *s != ')'; s++) {
                        if (*s != ',') {
                                if (!flag) {
                                        flag++;
                                        args[argc++] = s;
                                }
                        } else {
                                if (flag) {
                                        *s = '\0';
                                        flag = 0;
                                }
                        }
                }
                if (*s == ')')
                        *s = '\0';

                switch (argc) {
                case 3:
                    *part = atoi(args[2]);
                    /* FALL THROUGH */
                case 2:
                    *unit = atoi(args[1]);
                    /* FALL THROUGH */
                case 1:
                    *ctlr = atoi(args[0]);
                    break;
                }
                *file = ++s;
        } else {
                /* no device present */
                *file = (char *)fname;
        }
        return (0);

baddev:
        return (EINVAL);
}

int
devopen(struct open_file *f, const char *fname, char **file)
{
        int error;
        int dev = 0, ctlr = 0, unit = 0, part = 0;
        int adapt = 0;
        struct devsw *dp = &devsw[0];
        extern struct devsw pseudo_devsw;

        error = devparse(fname, &dev, &adapt, &ctlr, &unit, &part, file);
        if (error == 0) {
                dp = &devsw[dev];
                if (!dp->dv_open)
                        return (ENODEV);
        } else {
                if (strcmp(fname, "in()") == 0) {
                        /* special case: kernel in memory */
                        dp = &pseudo_devsw;
                        printf("in memory kernel\n");
                } else
                        return (error);
        }

        f->f_dev = dp;
        if ((error = (*dp->dv_open)(f, ctlr, unit, part)) == 0)
                return (0);

        if (strcmp(fname, "in()") == 0)
                printf("in(): %s\n", strerror(error));
        else
                printf("%s(%d,%d,%d): %s\n", dp->dv_name,
                        ctlr, unit, part, strerror(error));

        return (error);
}