/* $NetBSD: devopen.c,v 1.1.1.1 2017/07/24 08:56:29 mrg Exp $ */ /*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Ralph Campbell. * * 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. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * @(#)devopen.c 8.1 (Berkeley) 6/10/93 */ #include /* * Decode the string 'fname', open the device and return the remaining * file name if any. */ int devopen(struct open_file *f, const char *fname, char **file) /* file: out */ { register char *cp; register struct devsw *dp; #if 0 register char *ncp; register int c, i; char namebuf[20]; #endif int ctlr = 0, unit = 0, part = 0; int rc; cp = (char *)fname; #if 0 ncp = namebuf; /* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */ if ((c = *cp) >= '0' && c <= '9') { ctlr = c - '0'; /* skip the '/' */ if (*++cp != '/') return (ENXIO); cp++; while ((c = *cp) != '\0') { if (c == '/') break; if (c >= '0' && c <= '9') { /* read unit number */ unit = c - '0'; /* look for a partition */ if ((c = *++cp) >= 'a' && c <= 'h') { part = c - 'a'; c = *++cp; } if (c != '/') return (ENXIO); break; } if (ncp < namebuf + sizeof(namebuf) - 1) *ncp++ = c; cp++; } *ncp = '\0'; /* * XXX * pulling strchr from the C library, should pull from libkern. */ } else if (strchr(cp, '(')) { /* expect a string like 'rz(0,0,0)vmunix' */ while ((c = *cp) != '\0') { if (c == '(') { cp++; break; } if (ncp < namebuf + sizeof(namebuf) - 1) *ncp++ = c; cp++; } /* get controller number */ if ((c = *cp) >= '0' && c <= '9') { ctlr = c - '0'; c = *++cp; } if (c == ',') { /* get SCSI device number */ if ((c = *++cp) >= '0' && c <= '9') { unit = c - '0'; c = *++cp; } if (c == ',') { /* get partition number */ if ((c = *++cp) >= '0' && c <= '9') { part = c - '0'; c = *++cp; } } } if (c != ')') return (ENXIO); cp++; *ncp = '\0'; } else { #endif dp = devsw; ctlr = unit = part = 0; goto fnd; #if 0 } for (dp = devsw, i = 0; i < ndevs; dp++, i++) if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0) goto fnd; printf("Unknown device '%s'\nKnown devices are:", namebuf); for (dp = devsw, i = 0; i < ndevs; dp++, i++) if (dp->dv_name) printf(" %s", dp->dv_name); printf("\n"); return (ENXIO); #endif fnd: rc = (dp->dv_open)(f, ctlr, unit, part); if (rc) return (rc); f->f_dev = dp; if (file && *cp != '\0') *file = cp; return (0); }