libcsupport/src/sup_fs_next_token.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief RTEMS File System Eval Eat Delimiter Path
0007  *  @ingroup LibIOInternal
0008  */
0009
0010 /*
0011  * Copyright (c) 2012 embedded brains GmbH & Co. KG
0012  *
0013  * Redistribution and use in source and binary forms, with or without
0014  * modification, are permitted provided that the following conditions
0015  * are met:
0016  * 1. Redistributions of source code must retain the above copyright
0017  *    notice, this list of conditions and the following disclaimer.
0018  * 2. Redistributions in binary form must reproduce the above copyright
0019  *    notice, this list of conditions and the following disclaimer in the
0020  *    documentation and/or other materials provided with the distribution.
0021  *
0022  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0023  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0025  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0028  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0029  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0030  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0032  * POSSIBILITY OF SUCH DAMAGE.
0033  */
0034
0035 #ifdef HAVE_CONFIG_H
0036 #include "config.h"
0037 #endif
0038
0039 #include <rtems/libio_.h>
0040
0041 void rtems_filesystem_eval_path_eat_delimiter(
0042   rtems_filesystem_eval_path_context_t *ctx
0043 )
0044 {
0045   const char *current = ctx->path;
0046   const char *end = current + ctx->pathlen;
0047
0048   while (current != end && rtems_filesystem_is_delimiter(*current)) {
0049     ++current;
0050   }
0051
0052   ctx->path = current;
0053   ctx->pathlen = (size_t) (end - current);
0054 }
0055
0056 static void next_token(rtems_filesystem_eval_path_context_t *ctx)
0057 {
0058   const char *begin = ctx->path;
0059   const char *end = begin + ctx->pathlen;
0060   const char *current = begin;
0061
0062   while (current != end && !rtems_filesystem_is_delimiter(*current)) {
0063     ++current;
0064   }
0065
0066   ctx->path = current;
0067   ctx->pathlen = (size_t) (end - current);
0068   ctx->token = begin;
0069   ctx->tokenlen = (size_t) (current - begin);
0070 }
0071
0072 void rtems_filesystem_eval_path_next_token(
0073   rtems_filesystem_eval_path_context_t *ctx
0074 )
0075 {
0076   rtems_filesystem_eval_path_eat_delimiter(ctx);
0077   next_token(ctx);
0078 }