usr/src/lib/lvm/libmeta/common/metasplitname.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * split and splice name
  31  */
  32
  33 #include <meta.h>
  34
  35 int
  36 splitname(char *name, md_splitname *spn)
  37 {
  38         size_t prefixlen;
  39         size_t suffixlen;
  40         char    *lastslash;
  41         int     retval = METASPLIT_SUCCESS;
  42
  43         lastslash = strrchr(name, '/');
  44         if (lastslash != NULL) {
  45                 prefixlen = lastslash - name;
  46                 suffixlen = (strlen(name) - prefixlen) - 1; /* slash dropped */
  47         } else {
  48                 prefixlen = 0;
  49                 suffixlen = strlen(name);
  50         }
  51         if (prefixlen > MD_MAXPREFIX)
  52                 return (METASPLIT_LONGPREFIX);
  53
  54         if (suffixlen > MD_MAXSUFFIX) {
  55                 lastslash = META_LONGDISKNAME_STR;
  56                 prefixlen = 0;
  57                 suffixlen = strlen(lastslash);
  58                 (void) memcpy(SPN_SUFFIX(spn).suf_data, lastslash, suffixlen);
  59                 SPN_SUFFIX(spn).suf_len = suffixlen;
  60                 retval = METASPLIT_LONGDISKNAME;
  61         } else {
  62                 (void) memcpy(SPN_SUFFIX(spn).suf_data, lastslash + 1,
  63                     suffixlen);
  64                 SPN_SUFFIX(spn).suf_len = suffixlen;
  65         }
  66
  67         (void) memcpy(SPN_PREFIX(spn).pre_data, name, prefixlen);
  68         SPN_PREFIX(spn).pre_len = prefixlen;
  69
  70         return (retval);
  71 }
  72
  73 char *
  74 splicename(md_splitname *spn)
  75 {
  76         char *name;
  77         char *suffix;
  78         size_t prefixlen;
  79         size_t suffixlen;
  80
  81         prefixlen = SPN_PREFIX(spn).pre_len;
  82         suffixlen = SPN_SUFFIX(spn).suf_len;
  83         name = Malloc(prefixlen + suffixlen + 2);
  84         (void) memcpy(name, SPN_PREFIX(spn).pre_data, prefixlen);
  85         name[prefixlen] = '/';
  86         suffix = name + (prefixlen + 1);
  87         (void) memcpy(suffix, SPN_SUFFIX(spn).suf_data, suffixlen);
  88         name[prefixlen + suffixlen + 1] = 0;
  89         return (name);
  90 }