nuttx/libs/libc/string/lib_strspn.c

/****************************************************************************
 * libs/libc/string/lib_strspn.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <sys/types.h>
#include <string.h>

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: strspn
 *
 * Description:
 *  strspn() calculates the length of the initial segment of s which
 *  consists entirely of characters in accept.
 *
 ****************************************************************************/

size_t strspn(const char *s, const char *accept)
{
  size_t i;
  for (i = 0; s[i] && strchr(accept, s[i]) != NULL; i++);
  return i;
}