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Annotation of sys/arch/armish/stand/boot/devopen.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: devopen.c,v 1.2 2006/07/29 15:01:49 kettenis Exp $    */
                      2: /*     $NetBSD: devopen.c,v 1.1 2003/06/25 17:24:22 cdi Exp $  */
                      3:
                      4: /*-
                      5:  * Copyright (c) 2003 The NetBSD Foundation, Inc.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to The NetBSD Foundation
                      9:  * by Rolf Grossmann.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
                     21:  *        This product includes software developed by the NetBSD
                     22:  *        Foundation, Inc. and its contributors.
                     23:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     24:  *    contributors may be used to endorse or promote products derived
                     25:  *    from this software without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     28:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     29:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     30:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     31:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     32:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     33:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     34:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     35:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     36:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     37:  * POSSIBILITY OF SUCH DAMAGE.
                     38:  */
                     39:
                     40: #include "libsa.h"
                     41:
                     42: #define MAXDEVNAME      16
                     43:
                     44: /*
                     45:  * Parse a device spec.
                     46:  *
                     47:  * [A-Za-z]*[0-9]*[A-Za-z]:file
                     48:  *    dev   uint    part
                     49:  */
                     50: int
                     51: devparse(const char *fname, int *dev, int *unit, int *part, const char **file)
                     52: {
                     53:        const char *s;
                     54:
                     55:        *unit = 0;      /* default to wd0a */
                     56:        *part = 0;
                     57:        *dev  = 0;
                     58:
                     59:        s = strchr(fname, ':');
                     60:        if (s != NULL) {
                     61:                int devlen;
                     62:                int i, u, p;
                     63:                struct devsw *dp;
                     64:                char devname[MAXDEVNAME];
                     65:
                     66:                devlen = s - fname;
                     67:                if (devlen > MAXDEVNAME)
                     68:                        return (EINVAL);
                     69:
                     70:                /* extract device name */
                     71:                for (i = 0; isalpha(fname[i]) && (i < devlen); i++)
                     72:                        devname[i] = fname[i];
                     73:                devname[i] = 0;
                     74:
                     75:                if (!isdigit(fname[i]))
                     76:                        return (EUNIT);
                     77:
                     78:                /* device number */
                     79:                for (u = 0; isdigit(fname[i]) && (i < devlen); i++)
                     80:                        u = u * 10 + (fname[i] - '0');
                     81:
                     82:                if (!isalpha(fname[i]))
                     83:                        return (EPART);
                     84:
                     85:                /* partition number */
                     86:                if (i < devlen)
                     87:                        p = fname[i++] - 'a';
                     88:
                     89:                if (i != devlen)
                     90:                        return (ENXIO);
                     91:
                     92:                /* check device name */
                     93:                for (dp = devsw, i = 0; i < ndevs; dp++, i++) {
                     94:                        if (dp->dv_name && !strcmp(devname, dp->dv_name))
                     95:                                break;
                     96:                }
                     97:
                     98:                if (i >= ndevs)
                     99:                        return (ENXIO);
                    100:
                    101:                *unit = u;
                    102:                *part = p;
                    103:                *dev  = i;
                    104:                fname = ++s;
                    105:        }
                    106:
                    107:        *file = fname;
                    108:
                    109:        return (0);
                    110: }
                    111:
                    112: int
                    113: devopen(struct open_file *f, const char *fname, char **file)
                    114: {
                    115:        struct devsw *dp;
                    116:        int dev, unit, part, error;
                    117:
                    118:        error = devparse(fname, &dev, &unit, &part, (const char **)file);
                    119:        if (error)
                    120:                return (error);
                    121:
                    122:        dp = &devsw[dev];
                    123:        if ((void *)dp->dv_open == (void *)nodev)
                    124:                return (ENXIO);
                    125:
                    126:        f->f_dev = dp;
                    127:
                    128:        return (*dp->dv_open)(f, unit, part);
                    129: }