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