text: /****************************************************************************
   * include/ctype.h
   *
   *   Copyright (C) 2007-2009, 2011, 2014, 2016 Gregory Nutt.
   *   All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  #ifndef __INCLUDE_CTYPE_H
  #define __INCLUDE_CTYPE_H
  
  /* There is no consistent ctype implementation, just a smattering of
   * functions.  Individually, they are okay, but a more standard, data lookup
   * approach would make more sense if used extensively.
   */
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/compiler.h>
  
  /****************************************************************************
   * Inline Functions
   ****************************************************************************/
  
  #ifdef __cplusplus
  #define EXTERN extern "C"
  extern "C"
  {
  #else
  #define EXTERN extern
  #endif
  
  /****************************************************************************
   * Name: isspace
   *
   * Description:
   *   Checks  for  white-space characters.  In the "C" and "POSIX" locales,
   *   these are: space, form-feed ('\f'), newline ('\n'), carriage return
   *   ('\r'), horizontal tab ('\t'), and vertical tab ('\v').
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isspace(int c)
  {
    return c == ' ' || c == '\t' || c == '\n' || c == '\r' ||
           c == '\f' || c == '\v';
  }
  #else
  int isspace(int c);
  #endif
  
  /****************************************************************************
   * Name: isascii
   *
   * Description:
   *   Checks whether c is a 7-bit unsigned char value that fits into the
   *   ASCII character set.
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isascii(int c)
  {
    return c >= 0 && c <= 0x7f;
  }
  #else
  int isascii(int c);
  #endif
  
  /****************************************************************************
   * Name: isprint
   *
   * Description:
   *   Checks for a printable character (including space)
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isprint(int c)
  {
    return c >= 0x20 && c < 0x7f;
  }
  #else
  int isprint(int c);
  #endif
  
  /****************************************************************************
   * Name: isgraph
   *
   * Description:
   *   Checks for a printable character (excluding space)
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isgraph(int c)
  {
    return c > 0x20 && c < 0x7f;
  }
  #else
  int isgraph(int c);
  #endif
  
  /****************************************************************************
   * Name: iscntrl
   *
   * Description:
   *   Checks for control character.
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int iscntrl(int c)
  {
    return !isprint(c);
  }
  #else
  int iscntrl(int c);
  #endif
  
  /****************************************************************************
   * Name: islower
   *
   * Description:
   *   Checks for an lowercase letter.
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int islower(int c)
  {
    return c >= 'a' && c <= 'z';
  }
  #else
  int islower(int c);
  #endif
  
  /****************************************************************************
   * Name: isupper
   *
   * Description:
   *   Checks for an uppercase letter.
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isupper(int c)
  {
    return c >= 'A' && c <= 'Z';
  }
  #else
  int isupper(int c);
  #endif
  
  /****************************************************************************
   * Name: isalpha
   *
   * Description:
   *   Checks for an alphabetic character
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isalpha(int c)
  {
    return islower(c) || isupper(c);
  }
  #else
  int isalpha(int c);
  #endif
  
  /****************************************************************************
   * Name: isblank
   *
   * Description:
   *   Checks for blank characters (space or tab). C++11
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isblank(int c)
  {
    return c == ' ' || c == '\t';
  }
  #else
  int isblank(int c);
  #endif
  
  /****************************************************************************
   * Name: isdigit
   *
   * Description:
   *   ANSI standard isdigit implementation.
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isdigit(int c)
  {
    return c >= '0' && c <= '9';
  }
  #else
  int isdigit(int c);
  #endif
  
  /****************************************************************************
   * Name: isalnum
   *
   * Description:
   *   Checks for an alphanumeric character
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isalnum(int c)
  {
    return isalpha(c) || isdigit(c);
  }
  #else
  int isalnum(int c);
  #endif
  
  /****************************************************************************
   * Name: ispunct
   *
   * Description:
   *   Checks for a printable character which is not a space or an
   *   alphanumeric character
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int ispunct(int c)
  {
    return isgraph(c) && !isalnum(c);
  }
  #else
  int ispunct(int c);
  #endif
  
  /****************************************************************************
   * Name: isxdigit
   *
   * Description:
   *   isxdigit() checks for a hexadecimal digits, i.e. one of {0-9,a-f,A-F}
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int isxdigit(int c)
  {
    return (c >= '0' && c <= '9') ||
           (c >= 'a' && c <= 'f') ||
           (c >= 'A' && c <= 'F');
  }
  #else
  int isxdigit(int c);
  #endif
  
  /****************************************************************************
   * Name: toupper
   *
   * Description:
   *   toupper() converts the letter c to upper case, if possible.
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int toupper(int c)
  {
    return (c >= 'a' && c <= 'z') ? c - 'a' + 'A' : c;
  }
  #else
  int toupper(int c);
  #endif
  
  /****************************************************************************
   * Name: tolower
   *
   * Description:
   *   tolower() converts the letter c to lower case, if possible.
   *
   ****************************************************************************/
  
  #ifdef __cplusplus
  static inline int tolower(int c)
  {
    return (c >= 'A' && c <= 'Z') ? (c - 'A' + 'a') : c;
  }
  #else
  int tolower(int c);
  #endif
  
  #undef EXTERN
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* __INCLUDE_CTYPE_H */
  