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      1 /*===---- limits.h - Standard header for integer sizes --------------------===*\
      2  *
      3  * Copyright (c) 2009 Chris Lattner
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining a copy
      6  * of this software and associated documentation files (the "Software"), to deal
      7  * in the Software without restriction, including without limitation the rights
      8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      9  * copies of the Software, and to permit persons to whom the Software is
     10  * furnished to do so, subject to the following conditions:
     11  *
     12  * The above copyright notice and this permission notice shall be included in
     13  * all copies or substantial portions of the Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     21  * THE SOFTWARE.
     22  *
     23 \*===----------------------------------------------------------------------===*/
     24 
     25 #ifndef __CLANG_LIMITS_H
     26 #define __CLANG_LIMITS_H
     27 
     28 /* The system's limits.h may, in turn, try to #include_next GCC's limits.h.
     29    Avert this #include_next madness. */
     30 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
     31 #define _GCC_LIMITS_H_
     32 #endif
     33 
     34 /* System headers include a number of constants from POSIX in <limits.h>.
     35    Include it if we're hosted. */
     36 #if __STDC_HOSTED__ && \
     37     defined(__has_include_next) && __has_include_next(<limits.h>)
     38 #include_next <limits.h>
     39 #endif
     40 
     41 /* Many system headers try to "help us out" by defining these.  No really, we
     42    know how big each datatype is. */
     43 #undef  SCHAR_MIN
     44 #undef  SCHAR_MAX
     45 #undef  UCHAR_MAX
     46 #undef  SHRT_MIN
     47 #undef  SHRT_MAX
     48 #undef  USHRT_MAX
     49 #undef  INT_MIN
     50 #undef  INT_MAX
     51 #undef  UINT_MAX
     52 #undef  LONG_MIN
     53 #undef  LONG_MAX
     54 #undef  ULONG_MAX
     55 
     56 #undef  CHAR_BIT
     57 #undef  CHAR_MIN
     58 #undef  CHAR_MAX
     59 
     60 /* C90/99 5.2.4.2.1 */
     61 #define SCHAR_MAX __SCHAR_MAX__
     62 #define SHRT_MAX  __SHRT_MAX__
     63 #define INT_MAX   __INT_MAX__
     64 #define LONG_MAX  __LONG_MAX__
     65 
     66 #define SCHAR_MIN (-__SCHAR_MAX__-1)
     67 #define SHRT_MIN  (-__SHRT_MAX__ -1)
     68 #define INT_MIN   (-__INT_MAX__  -1)
     69 #define LONG_MIN  (-__LONG_MAX__ -1L)
     70 
     71 #define UCHAR_MAX (__SCHAR_MAX__*2  +1)
     72 #define USHRT_MAX (__SHRT_MAX__ *2  +1)
     73 #define UINT_MAX  (__INT_MAX__  *2U +1U)
     74 #define ULONG_MAX (__LONG_MAX__ *2UL+1UL)
     75 
     76 #ifndef MB_LEN_MAX
     77 #define MB_LEN_MAX 1
     78 #endif
     79 
     80 #define CHAR_BIT  __CHAR_BIT__
     81 
     82 #ifdef __CHAR_UNSIGNED__  /* -funsigned-char */
     83 #define CHAR_MIN 0
     84 #define CHAR_MAX UCHAR_MAX
     85 #else
     86 #define CHAR_MIN SCHAR_MIN
     87 #define CHAR_MAX __SCHAR_MAX__
     88 #endif
     89 
     90 /* C99 5.2.4.2.1: Added long long. */
     91 #if __STDC_VERSION__ >= 199901
     92 
     93 #undef  LLONG_MIN
     94 #undef  LLONG_MAX
     95 #undef  ULLONG_MAX
     96 
     97 #define LLONG_MAX  __LONG_LONG_MAX__
     98 #define LLONG_MIN  (-__LONG_LONG_MAX__-1LL)
     99 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
    100 #endif
    101 
    102 /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension.  It's too bad
    103    that we don't have something like #pragma poison that could be used to
    104    deprecate a macro - the code should just use LLONG_MAX and friends.
    105  */
    106 #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__)
    107 
    108 #undef   LONG_LONG_MIN
    109 #undef   LONG_LONG_MAX
    110 #undef   ULONG_LONG_MAX
    111 
    112 #define LONG_LONG_MAX  __LONG_LONG_MAX__
    113 #define LONG_LONG_MIN  (-__LONG_LONG_MAX__-1LL)
    114 #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
    115 #endif
    116 
    117 #endif /* __CLANG_LIMITS_H */
    118