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Annotation of sys/arch/alpha/stand/boot/devopen.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: devopen.c,v 1.8 2003/06/02 23:27:44 millert Exp $     */
        !             2: /*     $NetBSD: devopen.c,v 1.1 1995/11/23 02:39:37 cgd Exp $  */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 1992, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to Berkeley by
        !             9:  * Ralph Campbell.
        !            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. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  *
        !            35:  *     @(#)devopen.c   8.1 (Berkeley) 6/10/93
        !            36:  */
        !            37:
        !            38: #include <lib/libsa/stand.h>
        !            39:
        !            40: /*
        !            41:  * Decode the string 'fname', open the device and return the remaining
        !            42:  * file name if any.
        !            43:  */
        !            44: devopen(f, fname, file)
        !            45:        struct open_file *f;
        !            46:        const char *fname;
        !            47:        char **file;    /* out */
        !            48: {
        !            49:        register char *cp;
        !            50:        register char *ncp;
        !            51:        register struct devsw *dp;
        !            52:        register int c, i;
        !            53:        int ctlr = 0, unit = 0, part = 0;
        !            54:        char namebuf[20];
        !            55:        int rc;
        !            56:
        !            57:        cp = (char *)fname;
        !            58:        ncp = namebuf;
        !            59:
        !            60:        /* look for a string like 'disk(0,0,0)bsd' */
        !            61:        if (strchr(cp, '(')) {
        !            62:                while ((c = *cp) != '\0') {
        !            63:                        if (c == '(') {
        !            64:                                cp++;
        !            65:                                break;
        !            66:                        }
        !            67:                        if (ncp < namebuf + sizeof(namebuf) - 1)
        !            68:                                *ncp++ = c;
        !            69:                        cp++;
        !            70:                }
        !            71:
        !            72:                /* get controller number */
        !            73:                if ((c = *cp) >= '0' && c <= '9') {
        !            74:                        ctlr = c - '0';
        !            75:                        c = *++cp;
        !            76:                }
        !            77:
        !            78:                if (c == ',') {
        !            79:                        /* get SCSI device number */
        !            80:                        if ((c = *++cp) >= '0' && c <= '9') {
        !            81:                                unit = c - '0';
        !            82:                                c = *++cp;
        !            83:                        }
        !            84:
        !            85:                        if (c == ',') {
        !            86:                                /* get partition number */
        !            87:                                if ((c = *++cp) >= '0' && c <= '9') {
        !            88:                                        part = c - '0';
        !            89:                                        c = *++cp;
        !            90:                                }
        !            91:                        }
        !            92:                }
        !            93:                if (c != ')')
        !            94:                        goto defdev;
        !            95:                cp++;
        !            96:                *ncp = '\0';
        !            97:        } else {
        !            98: defdev:
        !            99:                /* No valid device specification */
        !           100:                cp = (char *)fname;
        !           101:                ncp = namebuf;
        !           102:                dp = devsw;
        !           103:                ctlr = unit = part = 0;
        !           104:                goto fnd;
        !           105:        }
        !           106:
        !           107:        for (dp = devsw, i = 0; i < ndevs; dp++, i++)
        !           108:                if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
        !           109:                        goto fnd;
        !           110:        printf("Unknown device '%s'\nKnown devices are:", namebuf);
        !           111:        for (dp = devsw, i = 0; i < ndevs; dp++, i++)
        !           112:                if (dp->dv_name)
        !           113:                        printf(" %s", dp->dv_name);
        !           114:        printf("\n");
        !           115:        return (ENXIO);
        !           116:
        !           117: fnd:
        !           118:        rc = (dp->dv_open)(f, ctlr, unit, part);
        !           119:        if (rc)
        !           120:                return (rc);
        !           121:
        !           122:        f->f_dev = dp;
        !           123:        if (file && *cp != '\0')
        !           124:                *file = cp;
        !           125:        return (0);
        !           126: }