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RIOT/sys/posix/include/strings.h 1.17 KB
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  /*
   * Copyright (C) 2013  INRIA.
   *
   * This file is subject to the terms and conditions of the GNU Lesser
   * General Public License v2.1. See the file LICENSE in the top level
   * directory for more details.
   */
  
  /**
   * @ingroup     posix
   * @{
   *
   * @file
   * @brief   string operations
   *
   * @see     <a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/strings.h.html">
   *              The Open Group Base Specifications Issue 7, <strings.h>
   *          </a>
   *
   * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
   */
  #ifndef STRINGS_H
  #define STRINGS_H
  
  #include <sys/types.h>
  #include <stddef.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * @brief   Returns the position of the first (least significant) bit set in
   *          integer *i*, or 0 if no bits are set in i.
   *
   * @param[in] i    an integer number.
   *
   * @return  Position (1 for least significant bit) of the first bit set,
   *          0 if no bits are set.
   *
   * @see <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/ffs.html">
   *          The Open Group Base Specification Issue 7, ffs
   *      </a>
   */
  #define ffs(i) __builtin_ffs(i)
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* STRINGS_H */