external/cddl/osnet/lib/libzfs/mkdirp.c

   1 /*      $NetBSD: mkdirp.c,v 1.1 2009/03/26 22:11:44 ad Exp $    */
   2
   3 /*
   4  * CDDL HEADER START
   5  *
   6  * The contents of this file are subject to the terms of the
   7  * Common Development and Distribution License, Version 1.0 only
   8  * (the "License").  You may not use this file except in compliance
   9  * with the License.
  10  *
  11  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  12  * or http://www.opensolaris.org/os/licensing.
  13  * See the License for the specific language governing permissions
  14  * and limitations under the License.
  15  *
  16  * When distributing Covered Code, include this CDDL HEADER in each
  17  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  18  * If applicable, add the following below this CDDL HEADER, with the
  19  * fields enclosed by brackets "[]" replaced with your own identifying
  20  * information: Portions Copyright [yyyy] [name of copyright owner]
  21  *
  22  * CDDL HEADER END
  23  */
  24
  25 /*      Copyright (c) 1988 AT&T */
  26 /*        All Rights Reserved   */
  27
  28 /*
  29  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32
  33 #pragma ident   "@(#)mkdirp.c   1.15    06/01/04 SMI"
  34
  35 /*
  36  * Creates directory and it's parents if the parents do not
  37  * exist yet.
  38  *
  39  * Returns -1 if fails for reasons other than non-existing
  40  * parents.
  41  * Does NOT simplify pathnames with . or .. in them.
  42  */
  43
  44 #include <sys/types.h>
  45 #include <libgen.h>
  46 #include <stdlib.h>
  47 #include <unistd.h>
  48 #include <errno.h>
  49 #include <string.h>
  50 #include <sys/stat.h>
  51
  52 static char *simplify(const char *str);
  53
  54 int
  55 mkdirp(const char *d, mode_t mode)
  56 {
  57         char  *endptr, *ptr, *slash, *str;
  58
  59         str = simplify(d);
  60
  61         /* If space couldn't be allocated for the simplified names, return. */
  62
  63         if (str == NULL)
  64                 return (-1);
  65
  66                 /* Try to make the directory */
  67
  68         if (mkdir(str, mode) == 0) {
  69                 free(str);
  70                 return (0);
  71         }
  72         if (errno != ENOENT) {
  73                 free(str);
  74                 return (-1);
  75         }
  76         endptr = strrchr(str, '\0');
  77         slash = strrchr(str, '/');
  78
  79                 /* Search upward for the non-existing parent */
  80
  81         while (slash != NULL) {
  82
  83                 ptr = slash;
  84                 *ptr = '\0';
  85
  86                         /* If reached an existing parent, break */
  87
  88                 if (access(str, F_OK) == 0)
  89                         break;
  90
  91                         /* If non-existing parent */
  92
  93                 else {
  94                         slash = strrchr(str, '/');
  95
  96                                 /* If under / or current directory, make it. */
  97
  98                         if (slash == NULL || slash == str) {
  99                                 if (mkdir(str, mode) != 0 && errno != EEXIST) {
 100                                         free(str);
 101                                         return (-1);
 102                                 }
 103                                 break;
 104                         }
 105                 }
 106         }
 107
 108         /* Create directories starting from upmost non-existing parent */
 109
 110         while ((ptr = strchr(str, '\0')) != endptr) {
 111                 *ptr = '/';
 112                 if (mkdir(str, mode) != 0 && errno != EEXIST) {
 113                         /*
 114                          *  If the mkdir fails because str already
 115                          *  exists (EEXIST), then str has the form
 116                          *  "existing-dir/..", and this is really
 117                          *  ok. (Remember, this loop is creating the
 118                          *  portion of the path that didn't exist)
 119                          */
 120                         free(str);
 121                         return (-1);
 122                 }
 123         }
 124         free(str);
 125         return (0);
 126 }
 127
 128 /*
 129  *      simplify - given a pathname, simplify that path by removing
 130  *                 duplicate contiguous slashes.
 131  *
 132  *                 A simplified copy of the argument is returned to the
 133  *                 caller, or NULL is returned on error.
 134  *
 135  *                 The caller should handle error reporting based upon the
 136  *                 returned vlaue, and should free the returned value,
 137  *                 when appropriate.
 138  */
 139
 140 static char *
 141 simplify(const char *str)
 142 {
 143         int i;
 144         size_t mbPathlen;       /* length of multi-byte path */
 145         size_t wcPathlen;       /* length of wide-character path */
 146         wchar_t *wptr;          /* scratch pointer */
 147         wchar_t *wcPath;        /* wide-character version of the path */
 148         char *mbPath;           /* The copy fo the path to be returned */
 149
 150         /*
 151          *  bail out if there is nothing there.
 152          */
 153
 154         if (!str)
 155             return (NULL);
 156
 157         /*
 158          *  Get a copy of the argument.
 159          */
 160
 161         if ((mbPath = strdup(str)) == NULL) {
 162                 return (NULL);
 163         }
 164
 165         /*
 166          *  convert the multi-byte version of the path to a
 167          *  wide-character rendering, for doing our figuring.
 168          */
 169
 170         mbPathlen = strlen(mbPath);
 171
 172         if ((wcPath = calloc(sizeof (wchar_t), mbPathlen+1)) == NULL) {
 173                 free(mbPath);
 174                 return (NULL);
 175         }
 176
 177         if ((wcPathlen = mbstowcs(wcPath, mbPath, mbPathlen)) == (size_t)-1) {
 178                 free(mbPath);
 179                 free(wcPath);
 180                 return (NULL);
 181         }
 182
 183         /*
 184          *  remove duplicate slashes first ("//../" -> "/")
 185          */
 186
 187         for (wptr = wcPath, i = 0; i < wcPathlen; i++) {
 188                 *wptr++ = wcPath[i];
 189
 190                 if (wcPath[i] == '/') {
 191                         i++;
 192
 193                         while (wcPath[i] == '/') {
 194                                 i++;
 195                         }
 196
 197                         i--;
 198                 }
 199         }
 200
 201         *wptr = '\0';
 202
 203         /*
 204          *  now convert back to the multi-byte format.
 205          */
 206
 207         if (wcstombs(mbPath, wcPath, mbPathlen) == (size_t)-1) {
 208                 free(mbPath);
 209                 free(wcPath);
 210                 return (NULL);
 211         }
 212
 213         free(wcPath);
 214         return (mbPath);
 215 }