moved all files to the top-level
This commit is contained in:
639
lib/path.c
Normal file
639
lib/path.c
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@@ -0,0 +1,639 @@
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/*
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Copyright (c) 2016-2020 Chung, Hyung-Hwan. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <hio-path.h>
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#include "hio-prv.h"
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/* TODO: support the \\?\ prefix and the \\.\ prefix on windows
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* support \\?\UNC\server\path which is equivalent to \\server\path.
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* */
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/* ------------------------------------------------------------------ */
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/* UCH IMPLEMENTATION */
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/* ------------------------------------------------------------------ */
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#if 0
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int hio_is_ucstr_path_absolute (const hio_uch_t* path)
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{
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if (HIO_IS_PATH_SEP(path[0])) return 1;
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#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
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/* a drive like c:tmp is absolute in positioning the drive.
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* but the path within the drive is kind of relative */
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if (HIO_IS_PATH_DRIVE(path)) return 1;
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#endif
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return 0;
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}
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int hio_is_ucstr_path_drive (const hio_uch_t* path)
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{
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#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
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if (HIO_IS_PATH_DRIVE(path)) return 1;
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#endif
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return 0;
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}
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int hio_is_ucstr_path_drive_absolute (const hio_uch_t* path)
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{
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#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
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if (HIO_IS_PATH_DRIVE(path) && HIO_IS_PATH_SEP(path[2])) return 1;
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#endif
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return 0;
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}
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int hio_is_ucstr_path_drive_current (const hio_uch_t* path)
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{
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#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
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if (HIO_IS_PATH_DRIVE(path) && path[2] == '\0') return 1;
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#endif
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return 0;
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}
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#endif
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hio_oow_t hio_canon_ucstr_path (const hio_uch_t* path, hio_uch_t* canon, int flags)
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{
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const hio_uch_t* ptr;
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hio_uch_t* dst;
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hio_uch_t* non_root_start;
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int has_root = 0;
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#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
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int is_drive = 0;
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#endif
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hio_oow_t canon_len;
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if (path[0] == '\0')
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{
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/* if the source is empty, no translation is needed */
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canon[0] = '\0';
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return 0;
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}
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ptr = path;
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dst = canon;
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#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
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if (HIO_IS_PATH_DRIVE(ptr))
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{
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/* handle drive letter */
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*dst++ = *ptr++; /* drive letter */
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*dst++ = *ptr++; /* colon */
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is_drive = 1;
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if (HIO_IS_PATH_SEP(*ptr))
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{
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*dst++ = *ptr++; /* root directory */
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has_root = 1;
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}
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}
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else if (HIO_IS_PATH_SEP(*ptr))
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{
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*dst++ = *ptr++; /* root directory */
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has_root = 1;
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#if defined(_WIN32)
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/* handle UNC path for Windows */
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if (HIO_IS_PATH_SEP(*ptr))
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{
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*dst++ = *ptr++;
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if (HIO_IS_PATH_SEP_OR_NIL(*ptr))
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{
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/* if there is another separator after \\,
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* it's not an UNC path. */
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dst--;
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}
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else
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{
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/* if it starts with \\, process host name */
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do { *dst++ = *ptr++; } while (!HIO_IS_PATH_SEP_OR_NIL(*ptr));
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if (HIO_IS_PATH_SEP(*ptr)) *dst++ = *ptr++;
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}
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}
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#endif
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}
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#else
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if (HIO_IS_PATH_SEP(*ptr))
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{
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*dst++ = *ptr++; /* root directory */
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has_root = 1;
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}
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#endif
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/* non_root_start points to the beginning of the canonicalized
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* path excluding the root directory part. */
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non_root_start = dst;
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do
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{
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const hio_uch_t* seg;
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hio_oow_t seglen;
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/* skip duplicate separators */
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while (HIO_IS_PATH_SEP(*ptr)) ptr++;
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/* end of path reached */
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if (*ptr == '\0') break;
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/* find the next segment */
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seg = ptr;
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while (!HIO_IS_PATH_SEP_OR_NIL(*ptr)) ptr++;
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seglen = ptr - seg;
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/* handle the segment */
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if (seglen == 1 && seg[0] == '.')
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{
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/* eat up . */
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}
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else if (!(flags & HIO_CANON_UCSTR_PATH_KEEP_DOUBLE_DOTS) &&
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seglen == 2 && seg[0] == '.' && seg[1] == '.')
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{
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/* eat up the previous segment */
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hio_uch_t* tmp;
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tmp = dst;
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if (tmp > non_root_start)
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{
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/* there is a previous segment. */
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tmp--; /* skip the separator just before .. */
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/* find the beginning of the previous segment */
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while (tmp > non_root_start)
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{
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tmp--;
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if (HIO_IS_PATH_SEP(*tmp))
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{
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tmp++; /* position it next to the separator */
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break;
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}
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}
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}
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if (has_root)
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{
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/*
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* Eat up the previous segment if it exists.
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*
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* If it doesn't exist, tmp == dst so dst = tmp
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* keeps dst unchanged. If it exists,
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* tmp != dst. so dst = tmp changes dst.
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*
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* path /abc/def/..
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* ^ ^
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* seg ptr
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*
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* canon /abc/def/
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* ^ ^
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* tmp dst
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*/
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dst = tmp;
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}
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else
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{
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hio_oow_t prevlen;
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prevlen = dst - tmp;
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if (/*tmp == non_root_start &&*/ prevlen == 0)
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{
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/* there is no previous segment */
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goto normal;
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}
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if (prevlen == 3 && tmp[0] == '.' && tmp[1] == '.')
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{
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/* nothing to eat away because the previous segment is ../
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*
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* path ../../
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* ^ ^
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* seg ptr
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*
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* canon ../
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* ^ ^
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* tmp dst
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*/
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goto normal;
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}
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dst = tmp;
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}
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}
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else
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{
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normal:
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while (seg < ptr) *dst++ = *seg++;
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if (HIO_IS_PATH_SEP(*ptr))
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{
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/* this segment ended with a separator */
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*dst++ = *seg++; /* copy the separator */
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ptr++; /* move forward the pointer */
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}
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}
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}
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while (1);
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if (dst > non_root_start && HIO_IS_PATH_SEP(dst[-1]) &&
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((flags & HIO_CANON_BCSTR_PATH_DROP_TRAILING_SEP) || !HIO_IS_PATH_SEP(ptr[-1])))
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{
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/* if the canoncal path composed so far ends with a separator
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* and the original path didn't end with the separator, delete
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* the ending separator.
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* also delete it if HIO_CANON_BCSTR_PATH_DROP_TRAILING_SEP is set.
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*
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* dst > non_root_start:
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* there is at least 1 character after the root directory
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* part.
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* HIO_IS_PATH_SEP(dst[-1]):
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* the canonical path ends with a separator.
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* HIO_IS_PATH_SEP(ptr[-1]):
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* the origial path ends with a separator.
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*/
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dst[-1] = '\0';
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canon_len = dst - canon - 1;
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}
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else
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{
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/* just null-terminate the canonical path normally */
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dst[0] = '\0';
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canon_len = dst - canon;
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}
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if (canon_len <= 0)
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{
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if (!(flags & HIO_CANON_UCSTR_PATH_EMPTY_SINGLE_DOT))
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{
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/* when resolving to a single dot, a trailing separator is not
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* retained though the orignal path name contains it. */
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canon[0] = '.';
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canon[1] = '\0';
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canon_len = 1;
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}
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}
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else
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{
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/* drop a traling separator if the last segment is
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* double slashes */
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int adj_base_len = 3;
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#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
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if (is_drive && !has_root)
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{
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/* A path like A:..\\\ need some adjustment for
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* finalization below. */
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adj_base_len += 2;
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}
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#endif
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if (canon_len == adj_base_len)
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{
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/* i don't have to retain a trailing separator
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* if the last segment is double slashes because
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* the double slahses indicate a directory obviously */
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if (canon[canon_len-3] == '.' &&
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canon[canon_len-2] == '.' &&
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HIO_IS_PATH_SEP(canon[canon_len-1]))
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{
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canon[--canon_len] = '\0';
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}
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}
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else if (canon_len > adj_base_len)
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{
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||||
if (HIO_IS_PATH_SEP(canon[canon_len-4]) &&
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||||
canon[canon_len-3] == '.' &&
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||||
canon[canon_len-2] == '.' &&
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HIO_IS_PATH_SEP(canon[canon_len-1]))
|
||||
{
|
||||
canon[--canon_len] = '\0';
|
||||
}
|
||||
}
|
||||
}
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||||
return canon_len;
|
||||
}
|
||||
|
||||
|
||||
/* ------------------------------------------------------------------ */
|
||||
/* BCH IMPLEMENTATION */
|
||||
/* ------------------------------------------------------------------ */
|
||||
|
||||
#if 0
|
||||
int hio_is_bcstr_path_absolute (const hio_bch_t* path)
|
||||
{
|
||||
if (HIO_IS_PATH_SEP(path[0])) return 1;
|
||||
#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
|
||||
/* a drive like c:tmp is absolute in positioning the drive.
|
||||
* but the path within the drive is kind of relative */
|
||||
if (HIO_IS_PATH_DRIVE(path)) return 1;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
int hio_is_bcstr_path_drive (const hio_bch_t* path)
|
||||
{
|
||||
#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
|
||||
if (HIO_IS_PATH_DRIVE(path)) return 1;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
int hio_is_bcstr_path_drive_absolute (const hio_bch_t* path)
|
||||
{
|
||||
#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
|
||||
if (HIO_IS_PATH_DRIVE(path) && HIO_IS_PATH_SEP(path[2])) return 1;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
int hio_is_bcstr_path_drive_current (const hio_bch_t* path)
|
||||
{
|
||||
#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
|
||||
if (HIO_IS_PATH_DRIVE(path) && path[2] == '\0') return 1;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
hio_oow_t hio_canon_bcstr_path (const hio_bch_t* path, hio_bch_t* canon, int flags)
|
||||
{
|
||||
const hio_bch_t* ptr;
|
||||
hio_bch_t* dst;
|
||||
hio_bch_t* non_root_start;
|
||||
int has_root = 0;
|
||||
#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
|
||||
int is_drive = 0;
|
||||
#endif
|
||||
hio_oow_t canon_len;
|
||||
|
||||
if (path[0] == '\0')
|
||||
{
|
||||
/* if the source is empty, no translation is needed */
|
||||
canon[0] = '\0';
|
||||
return 0;
|
||||
}
|
||||
|
||||
ptr = path;
|
||||
dst = canon;
|
||||
|
||||
#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
|
||||
if (HIO_IS_PATH_DRIVE(ptr))
|
||||
{
|
||||
/* handle drive letter */
|
||||
*dst++ = *ptr++; /* drive letter */
|
||||
*dst++ = *ptr++; /* colon */
|
||||
|
||||
is_drive = 1;
|
||||
if (HIO_IS_PATH_SEP(*ptr))
|
||||
{
|
||||
*dst++ = *ptr++; /* root directory */
|
||||
has_root = 1;
|
||||
}
|
||||
}
|
||||
else if (HIO_IS_PATH_SEP(*ptr))
|
||||
{
|
||||
*dst++ = *ptr++; /* root directory */
|
||||
has_root = 1;
|
||||
|
||||
#if defined(_WIN32)
|
||||
/* handle UNC path for Windows */
|
||||
if (HIO_IS_PATH_SEP(*ptr))
|
||||
{
|
||||
*dst++ = *ptr++;
|
||||
|
||||
if (HIO_IS_PATH_SEP_OR_NIL(*ptr))
|
||||
{
|
||||
/* if there is another separator after \\,
|
||||
* it's not an UNC path. */
|
||||
dst--;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* if it starts with \\, process host name */
|
||||
do { *dst++ = *ptr++; } while (!HIO_IS_PATH_SEP_OR_NIL(*ptr));
|
||||
if (HIO_IS_PATH_SEP(*ptr)) *dst++ = *ptr++;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
}
|
||||
#else
|
||||
if (HIO_IS_PATH_SEP(*ptr))
|
||||
{
|
||||
*dst++ = *ptr++; /* root directory */
|
||||
has_root = 1;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* non_root_start points to the beginning of the canonicalized
|
||||
* path excluding the root directory part. */
|
||||
non_root_start = dst;
|
||||
|
||||
do
|
||||
{
|
||||
const hio_bch_t* seg;
|
||||
hio_oow_t seglen;
|
||||
|
||||
/* skip duplicate separators */
|
||||
while (HIO_IS_PATH_SEP(*ptr)) ptr++;
|
||||
|
||||
/* end of path reached */
|
||||
if (*ptr == '\0') break;
|
||||
|
||||
/* find the next segment */
|
||||
seg = ptr;
|
||||
while (!HIO_IS_PATH_SEP_OR_NIL(*ptr)) ptr++;
|
||||
seglen = ptr - seg;
|
||||
|
||||
/* handle the segment */
|
||||
if (seglen == 1 && seg[0] == '.')
|
||||
{
|
||||
/* eat up . */
|
||||
}
|
||||
else if (!(flags & HIO_CANON_BCSTR_PATH_KEEP_DOUBLE_DOTS) &&
|
||||
seglen == 2 && seg[0] == '.' && seg[1] == '.')
|
||||
{
|
||||
/* eat up the previous segment */
|
||||
hio_bch_t* tmp;
|
||||
|
||||
tmp = dst;
|
||||
if (tmp > non_root_start)
|
||||
{
|
||||
/* there is a previous segment. */
|
||||
|
||||
tmp--; /* skip the separator just before .. */
|
||||
|
||||
/* find the beginning of the previous segment */
|
||||
while (tmp > non_root_start)
|
||||
{
|
||||
tmp--;
|
||||
if (HIO_IS_PATH_SEP(*tmp))
|
||||
{
|
||||
tmp++; /* position it next to the separator */
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (has_root)
|
||||
{
|
||||
/*
|
||||
* Eat up the previous segment if it exists.
|
||||
*
|
||||
* If it doesn't exist, tmp == dst so dst = tmp
|
||||
* keeps dst unchanged. If it exists,
|
||||
* tmp != dst. so dst = tmp changes dst.
|
||||
*
|
||||
* path /abc/def/..
|
||||
* ^ ^
|
||||
* seg ptr
|
||||
*
|
||||
* canon /abc/def/
|
||||
* ^ ^
|
||||
* tmp dst
|
||||
*/
|
||||
dst = tmp;
|
||||
}
|
||||
else
|
||||
{
|
||||
hio_oow_t prevlen;
|
||||
|
||||
prevlen = dst - tmp;
|
||||
|
||||
if (/*tmp == non_root_start &&*/ prevlen == 0)
|
||||
{
|
||||
/* there is no previous segment */
|
||||
goto normal;
|
||||
}
|
||||
|
||||
if (prevlen == 3 && tmp[0] == '.' && tmp[1] == '.')
|
||||
{
|
||||
/* nothing to eat away because the previous segment is ../
|
||||
*
|
||||
* path ../../
|
||||
* ^ ^
|
||||
* seg ptr
|
||||
*
|
||||
* canon ../
|
||||
* ^ ^
|
||||
* tmp dst
|
||||
*/
|
||||
goto normal;
|
||||
}
|
||||
|
||||
dst = tmp;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
normal:
|
||||
while (seg < ptr) *dst++ = *seg++;
|
||||
if (HIO_IS_PATH_SEP(*ptr))
|
||||
{
|
||||
/* this segment ended with a separator */
|
||||
*dst++ = *seg++; /* copy the separator */
|
||||
ptr++; /* move forward the pointer */
|
||||
}
|
||||
}
|
||||
}
|
||||
while (1);
|
||||
|
||||
if (dst > non_root_start && HIO_IS_PATH_SEP(dst[-1]) &&
|
||||
((flags & HIO_CANON_BCSTR_PATH_DROP_TRAILING_SEP) || !HIO_IS_PATH_SEP(ptr[-1])))
|
||||
{
|
||||
/* if the canoncal path composed so far ends with a separator
|
||||
* and the original path didn't end with the separator, delete
|
||||
* the ending separator.
|
||||
* also delete it if HIO_CANON_BCSTR_PATH_DROP_TRAILING_SEP is set.
|
||||
*
|
||||
* dst > non_root_start:
|
||||
* there is at least 1 character after the root directory
|
||||
* part.
|
||||
* HIO_IS_PATH_SEP(dst[-1]):
|
||||
* the canonical path ends with a separator.
|
||||
* HIO_IS_PATH_SEP(ptr[-1]):
|
||||
* the origial path ends with a separator.
|
||||
*/
|
||||
dst[-1] = '\0';
|
||||
canon_len = dst - canon - 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* just null-terminate the canonical path normally */
|
||||
dst[0] = '\0';
|
||||
canon_len = dst - canon;
|
||||
}
|
||||
|
||||
if (canon_len <= 0)
|
||||
{
|
||||
if (!(flags & HIO_CANON_BCSTR_PATH_EMPTY_SINGLE_DOT))
|
||||
{
|
||||
/* when resolving to a single dot, a trailing separator is not
|
||||
* retained though the orignal path name contains it. */
|
||||
canon[0] = '.';
|
||||
canon[1] = '\0';
|
||||
canon_len = 1;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* drop a traling separator if the last segment is
|
||||
* double slashes */
|
||||
|
||||
int adj_base_len = 3;
|
||||
|
||||
#if defined(_WIN32) || defined(__OS2__) || defined(__DOS__)
|
||||
if (is_drive && !has_root)
|
||||
{
|
||||
/* A path like A:..\\\ need some adjustment for
|
||||
* finalization below. */
|
||||
adj_base_len += 2;
|
||||
}
|
||||
#endif
|
||||
|
||||
if (canon_len == adj_base_len)
|
||||
{
|
||||
/* i don't have to retain a trailing separator
|
||||
* if the last segment is double slashes because
|
||||
* the double slahses indicate a directory obviously */
|
||||
if (canon[canon_len-3] == '.' &&
|
||||
canon[canon_len-2] == '.' &&
|
||||
HIO_IS_PATH_SEP(canon[canon_len-1]))
|
||||
{
|
||||
canon[--canon_len] = '\0';
|
||||
}
|
||||
}
|
||||
else if (canon_len > adj_base_len)
|
||||
{
|
||||
if (HIO_IS_PATH_SEP(canon[canon_len-4]) &&
|
||||
canon[canon_len-3] == '.' &&
|
||||
canon[canon_len-2] == '.' &&
|
||||
HIO_IS_PATH_SEP(canon[canon_len-1]))
|
||||
{
|
||||
canon[--canon_len] = '\0';
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return canon_len;
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user