chromium / chromiumos / third_party / grub2 / 11508780425a8cd9a8d40370e2d2d4f458917a73 / . / grub-core / gnulib / intprops.h

/* intprops.h -- properties of integer types | |

Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010 Free Software | |

Foundation, Inc. | |

This program is free software: you can redistribute it and/or modify | |

it under the terms of the GNU General Public License as published by | |

the Free Software Foundation; either version 3 of the License, or | |

(at your option) any later version. | |

This program is distributed in the hope that it will be useful, | |

but WITHOUT ANY WARRANTY; without even the implied warranty of | |

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |

GNU General Public License for more details. | |

You should have received a copy of the GNU General Public License | |

along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |

/* Written by Paul Eggert. */ | |

#ifndef GL_INTPROPS_H | |

# define GL_INTPROPS_H | |

# include <limits.h> | |

/* The extra casts in the following macros work around compiler bugs, | |

e.g., in Cray C 5.0.3.0. */ | |

/* True if the arithmetic type T is an integer type. bool counts as | |

an integer. */ | |

# define TYPE_IS_INTEGER(t) ((t) 1.5 == 1) | |

/* True if negative values of the signed integer type T use two's | |

complement, ones' complement, or signed magnitude representation, | |

respectively. Much GNU code assumes two's complement, but some | |

people like to be portable to all possible C hosts. */ | |

# define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1) | |

# define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0) | |

# define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1) | |

/* True if the arithmetic type T is signed. */ | |

# define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) | |

/* The maximum and minimum values for the integer type T. These | |

macros have undefined behavior if T is signed and has padding bits. | |

If this is a problem for you, please let us know how to fix it for | |

your host. */ | |

# define TYPE_MINIMUM(t) \ | |

((t) (! TYPE_SIGNED (t) \ | |

? (t) 0 \ | |

: TYPE_SIGNED_MAGNITUDE (t) \ | |

? ~ (t) 0 \ | |

: ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))) | |

# define TYPE_MAXIMUM(t) \ | |

((t) (! TYPE_SIGNED (t) \ | |

? (t) -1 \ | |

: ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))) | |

/* Return zero if T can be determined to be an unsigned type. | |

Otherwise, return 1. | |

When compiling with GCC, INT_STRLEN_BOUND uses this macro to obtain a | |

tighter bound. Otherwise, it overestimates the true bound by one byte | |

when applied to unsigned types of size 2, 4, 16, ... bytes. | |

The symbol signed_type_or_expr__ is private to this header file. */ | |

# if __GNUC__ >= 2 | |

# define signed_type_or_expr__(t) TYPE_SIGNED (__typeof__ (t)) | |

# else | |

# define signed_type_or_expr__(t) 1 | |

# endif | |

/* Bound on length of the string representing an integer type or expression T. | |

Subtract 1 for the sign bit if T is signed; log10 (2.0) < 146/485; | |

add 1 for integer division truncation; add 1 more for a minus sign | |

if needed. */ | |

# define INT_STRLEN_BOUND(t) \ | |

((sizeof (t) * CHAR_BIT - signed_type_or_expr__ (t)) * 146 / 485 \ | |

+ signed_type_or_expr__ (t) + 1) | |

/* Bound on buffer size needed to represent an integer type or expression T, | |

including the terminating null. */ | |

# define INT_BUFSIZE_BOUND(t) (INT_STRLEN_BOUND (t) + 1) | |

#endif /* GL_INTPROPS_H */ |