diff options
Diffstat (limited to 'lib/libspl/mkdirp.c')
| -rw-r--r-- | lib/libspl/mkdirp.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/lib/libspl/mkdirp.c b/lib/libspl/mkdirp.c new file mode 100644 index 000000000..9c81f2a0b --- /dev/null +++ b/lib/libspl/mkdirp.c @@ -0,0 +1,212 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright 2008 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* Copyright (c) 1988 AT&T */ +/* All Rights Reserved */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +/* + * Creates directory and it's parents if the parents do not + * exist yet. + * + * Returns -1 if fails for reasons other than non-existing + * parents. + * Does NOT simplify pathnames with . or .. in them. + */ + +#include <sys/types.h> +#include <libgen.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <sys/stat.h> + +static char *simplify(const char *str); + +int +mkdirp(const char *d, mode_t mode) +{ + char *endptr, *ptr, *slash, *str; + + str = simplify(d); + + /* If space couldn't be allocated for the simplified names, return. */ + + if (str == NULL) + return (-1); + + /* Try to make the directory */ + + if (mkdir(str, mode) == 0) { + free(str); + return (0); + } + if (errno != ENOENT) { + free(str); + return (-1); + } + endptr = strrchr(str, '\0'); + slash = strrchr(str, '/'); + + /* Search upward for the non-existing parent */ + + while (slash != NULL) { + + ptr = slash; + *ptr = '\0'; + + /* If reached an existing parent, break */ + + if (access(str, F_OK) == 0) + break; + + /* If non-existing parent */ + + else { + slash = strrchr(str, '/'); + + /* If under / or current directory, make it. */ + + if (slash == NULL || slash == str) { + if (mkdir(str, mode) != 0 && errno != EEXIST) { + free(str); + return (-1); + } + break; + } + } + } + + /* Create directories starting from upmost non-existing parent */ + + while ((ptr = strchr(str, '\0')) != endptr) { + *ptr = '/'; + if (mkdir(str, mode) != 0 && errno != EEXIST) { + /* + * If the mkdir fails because str already + * exists (EEXIST), then str has the form + * "existing-dir/..", and this is really + * ok. (Remember, this loop is creating the + * portion of the path that didn't exist) + */ + free(str); + return (-1); + } + } + free(str); + return (0); +} + +/* + * simplify - given a pathname, simplify that path by removing + * duplicate contiguous slashes. + * + * A simplified copy of the argument is returned to the + * caller, or NULL is returned on error. + * + * The caller should handle error reporting based upon the + * returned vlaue, and should free the returned value, + * when appropriate. + */ + +static char * +simplify(const char *str) +{ + int i; + size_t mbPathlen; /* length of multi-byte path */ + size_t wcPathlen; /* length of wide-character path */ + wchar_t *wptr; /* scratch pointer */ + wchar_t *wcPath; /* wide-character version of the path */ + char *mbPath; /* The copy fo the path to be returned */ + + /* + * bail out if there is nothing there. + */ + + if (!str) + return (NULL); + + /* + * Get a copy of the argument. + */ + + if ((mbPath = strdup(str)) == NULL) { + return (NULL); + } + + /* + * convert the multi-byte version of the path to a + * wide-character rendering, for doing our figuring. + */ + + mbPathlen = strlen(mbPath); + + if ((wcPath = calloc(sizeof (wchar_t), mbPathlen+1)) == NULL) { + free(mbPath); + return (NULL); + } + + if ((wcPathlen = mbstowcs(wcPath, mbPath, mbPathlen)) == (size_t)-1) { + free(mbPath); + free(wcPath); + return (NULL); + } + + /* + * remove duplicate slashes first ("//../" -> "/") + */ + + for (wptr = wcPath, i = 0; i < wcPathlen; i++) { + *wptr++ = wcPath[i]; + + if (wcPath[i] == '/') { + i++; + + while (wcPath[i] == '/') { + i++; + } + + i--; + } + } + + *wptr = '\0'; + + /* + * now convert back to the multi-byte format. + */ + + if (wcstombs(mbPath, wcPath, mbPathlen) == (size_t)-1) { + free(mbPath); + free(wcPath); + return (NULL); + } + + free(wcPath); + return (mbPath); +} |