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150
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1 /*===---- limits.h - Standard header for integer sizes --------------------===*\
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2 *
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3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 * See https://llvm.org/LICENSE.txt for license information.
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5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 *
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7 \*===----------------------------------------------------------------------===*/
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8
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9 #ifndef __CLANG_LIMITS_H
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10 #define __CLANG_LIMITS_H
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11
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12 /* The system's limits.h may, in turn, try to #include_next GCC's limits.h.
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13 Avert this #include_next madness. */
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14 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
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15 #define _GCC_LIMITS_H_
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16 #endif
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17
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18 /* System headers include a number of constants from POSIX in <limits.h>.
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19 Include it if we're hosted. */
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20 #if __STDC_HOSTED__ && __has_include_next(<limits.h>)
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21 #include_next <limits.h>
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22 #endif
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23
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24 /* Many system headers try to "help us out" by defining these. No really, we
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25 know how big each datatype is. */
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26 #undef SCHAR_MIN
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27 #undef SCHAR_MAX
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28 #undef UCHAR_MAX
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29 #undef SHRT_MIN
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30 #undef SHRT_MAX
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31 #undef USHRT_MAX
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32 #undef INT_MIN
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33 #undef INT_MAX
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34 #undef UINT_MAX
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35 #undef LONG_MIN
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36 #undef LONG_MAX
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37 #undef ULONG_MAX
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38
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39 #undef CHAR_BIT
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40 #undef CHAR_MIN
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41 #undef CHAR_MAX
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42
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43 /* C90/99 5.2.4.2.1 */
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44 #define SCHAR_MAX __SCHAR_MAX__
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45 #define SHRT_MAX __SHRT_MAX__
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46 #define INT_MAX __INT_MAX__
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47 #define LONG_MAX __LONG_MAX__
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48
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49 #define SCHAR_MIN (-__SCHAR_MAX__-1)
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50 #define SHRT_MIN (-__SHRT_MAX__ -1)
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51 #define INT_MIN (-__INT_MAX__ -1)
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52 #define LONG_MIN (-__LONG_MAX__ -1L)
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53
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54 #define UCHAR_MAX (__SCHAR_MAX__*2 +1)
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55 #define USHRT_MAX (__SHRT_MAX__ *2 +1)
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56 #define UINT_MAX (__INT_MAX__ *2U +1U)
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57 #define ULONG_MAX (__LONG_MAX__ *2UL+1UL)
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58
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59 #ifndef MB_LEN_MAX
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60 #define MB_LEN_MAX 1
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61 #endif
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62
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63 #define CHAR_BIT __CHAR_BIT__
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64
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65 #ifdef __CHAR_UNSIGNED__ /* -funsigned-char */
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66 #define CHAR_MIN 0
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67 #define CHAR_MAX UCHAR_MAX
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68 #else
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69 #define CHAR_MIN SCHAR_MIN
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70 #define CHAR_MAX __SCHAR_MAX__
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71 #endif
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72
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73 /* C99 5.2.4.2.1: Added long long.
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74 C++11 18.3.3.2: same contents as the Standard C Library header <limits.h>.
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75 */
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76 #if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L
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77
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78 #undef LLONG_MIN
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79 #undef LLONG_MAX
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80 #undef ULLONG_MAX
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81
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82 #define LLONG_MAX __LONG_LONG_MAX__
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83 #define LLONG_MIN (-__LONG_LONG_MAX__-1LL)
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84 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
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85 #endif
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86
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87 /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad
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88 that we don't have something like #pragma poison that could be used to
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89 deprecate a macro - the code should just use LLONG_MAX and friends.
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90 */
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91 #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__)
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92
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93 #undef LONG_LONG_MIN
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94 #undef LONG_LONG_MAX
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95 #undef ULONG_LONG_MAX
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96
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97 #define LONG_LONG_MAX __LONG_LONG_MAX__
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98 #define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL)
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99 #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
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100 #endif
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101
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102 #endif /* __CLANG_LIMITS_H */
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