157 lines
4.8 KiB
C
157 lines
4.8 KiB
C
/*
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ChibiOS - Copyright (C) 2006,2007,2008,2009,2010,2011,2012,2013,2014,
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2015,2016,2017,2018,2019,2020,2021 Giovanni Di Sirio.
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This file is part of ChibiOS.
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ChibiOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation version 3 of the License.
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ChibiOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file vfs/src/chparser.c
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* @brief VFS parser utilities code.
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*
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* @addtogroup VFS_PARSER
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* @{
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*/
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#include "vfs.h"
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/*===========================================================================*/
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/* Module local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module exported functions. */
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/*===========================================================================*/
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/**
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* @brief Matches a path separator.
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*
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* @param[in, out] pathp Pointer to the path under parsing.
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*/
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msg_t vfs_parse_match_separator(const char **pathp) {
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msg_t err;
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const char *p = *pathp;
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if (!vfs_parse_is_separator(*p++)) {
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err = CH_RET_ENOENT;
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}
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else {
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err = CH_RET_SUCCESS;
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*pathp = p;
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}
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return err;
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}
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/**
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* @brief Matches a string end.
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*
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* @param[in, out] pathp Pointer to the path under parsing.
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*/
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msg_t vfs_parse_match_end(const char **pathp) {
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msg_t err;
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if (**pathp != '\0') {
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err = CH_RET_ENOENT;
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}
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else {
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err = CH_RET_SUCCESS;
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}
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return err;
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}
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/**
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* @brief Fetches the next path element.
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* @note Does not consume the next separator, if any.
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* @note Does not add a final zero to the fetched fname.
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* @note It can return an empty element, it has to be detected outside.
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*
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* @param[in, out] pathp Pointer to the path under parsing.
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* @param[out] fname Extracted file name.
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* @param[in] n Maximum size in @fname.
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*/
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msg_t vfs_parse_copy_fname(const char **pathp, char *fname, size_t n) {
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size_t size;
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const char *p;
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p = *pathp;
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size = 0U;
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while (true) {
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char c = *p;
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/* Path elements must be terminated by a separator or an end-of-string.*/
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if (vfs_parse_is_separator(c) || vfs_parse_is_terminator(c)) {
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/* Advancing the path pointer past the file name in the path and
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closing the file name string.*/
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*pathp = p;
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return (msg_t)size;
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}
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/* Valid characters for path names.*/
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if (!vfs_parse_is_filechar(c)) {
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return CH_RET_EINVAL;
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}
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/* Exceeding the maximum length.*/
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if (size > n) {
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return CH_RET_ENAMETOOLONG;
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}
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*fname++ = c;
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p++;
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size++;
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}
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}
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/**
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* @brief Fetches the next path element.
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* @note Does not consume the next separator, if any.
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* @note It can return an empty element, it has to be detected outside.
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*
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* @param[in, out] pathp Pointer to the path under parsing.
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* @param[out] fname Extracted file name.
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* @param[in] n Maximum size in @fname.
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*/
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msg_t vfs_parse_get_fname(const char **pathp, char *fname, size_t n) {
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msg_t ret;
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ret = vfs_parse_copy_fname(pathp, fname, n);
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CH_RETURN_ON_ERROR(ret);
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fname[ret] = '\0';
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return ret;
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}
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/** @} */
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