mirror of
https://codeberg.org/noisytoot/notnotdnethack.git
synced 2024-09-19 14:05:02 +01:00
Ron Nazarov
b5245a400c
This made it impossible to repeat a single command more than 32767 times, or take out/put in a partial stack of more than 32767 items. It's now capped at INT_MAX (2147483647 with 32-bit int) instead and uses C23 stdckdint.h macros to avoid signed integer overflows (which are undefined behaviour). If stdckdint.h is unavailable (it was only added in GCC 14), uses the GCC __builtin_*_overflow functions, which are supported since GCC 5. If these too are unavailable, falls back to an implementation using C11 _Generic. The fallback ckd_mul implementation just casts to a long long, so won't work for anything larger than a 32-bit integer (assuming 64-bit long long), which is fine for now since nothing since it's only used on ints. I'm not sure the fallback implementations are even necessary, since we already require either C23 or a GCC extension (__VA_OPT__) for macromagic.
104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
/* SCCS Id: @(#)tradstdc.h 3.4 1993/05/30 */
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/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
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/* NetHack may be freely redistributed. See license for details. */
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#ifndef TRADSTDC_H
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#define TRADSTDC_H
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/*
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* ANSI X3J11 detection.
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* Makes substitutes for compatibility with the old C standard.
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*/
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#ifdef NEED_VARARGS /* only define these if necessary */
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/*
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* These have changed since 3.4.3. VA_END() now provides an explicit
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* closing brace to complement VA_DECL()'s hidden opening brace, so code
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* started with VA_DECL() needs an extra opening brace to complement
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* the explicit final closing brace. This was done so that the source
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* would look less strange, where VA_DECL() appeared to introduce a
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* function whose opening brace was missing; there are now visible and
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* invisible braces at beginning and end. Sample usage:
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void foo VA_DECL(int, arg) --macro expansion has a hidden opening brace
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{ --new, explicit opening brace (actually introduces a nested block)
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VA_START(bar);
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...code for foo...
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VA_END(); --expansion now provides a closing brace for the nested block
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} --existing closing brace, still pairs with the hidden one in VA_DECL()
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* Reading the code--or using source browsing tools which match braces--
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* results in seeing a matched set of braces. Usage of VA_END() is
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* potentially trickier, but nethack uses it in a straightforward manner.
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*/
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#include <stdarg.h>
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#define VA_DECL(typ1,var1) (typ1 var1, ...) { va_list the_args;
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#define VA_DECL2(typ1,var1,typ2,var2) \
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(typ1 var1, typ2 var2, ...) { va_list the_args;
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#define VA_INIT(var1,typ1)
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#define VA_NEXT(var1,typ1) var1 = va_arg(the_args, typ1)
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#define VA_ARGS the_args
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#define VA_START(x) va_start(the_args, x)
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#define VA_END() va_end(the_args); }
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#endif /* NEED_VARARGS */
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/*
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* Allow gcc2 to check parameters of printf-like calls with -Wformat;
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* append this to a prototype declaration (see pline() in extern.h).
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*/
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#ifdef __GNUC__
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# if __GNUC__ >= 2
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#define PRINTF_F(f,v) __attribute__ ((format (printf, f, v)))
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# endif
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#endif
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#ifndef PRINTF_F
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#define PRINTF_F(f,v)
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#endif
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/*
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* If we don't have C23 <stdckdint.h>, fall back to GCC
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* __builtin_*_overflow functions. If we don't have those either,
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* fall back to implementation using C11 _Generic.
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*/
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#if __has_include(<stdckdint.h>)
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# include <stdckdint.h>
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#else
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# ifdef __GNUC__
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# define ckd_add(R, A, B) __builtin_add_overflow ((A), (B), (R))
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# define ckd_sub(R, A, B) __builtin_sub_overflow ((A), (B), (R))
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# define ckd_mul(R, A, B) __builtin_mul_overflow ((A), (B), (R))
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# else
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# define max_int_value(I) \
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_Generic((I), \
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signed char: SCHAR_MAX, \
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short: SHRT_MAX, \
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int: INT_MAX, \
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long: LONG_MAX, \
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long long: LLONG_MAX, \
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unsigned char: UCHAR_MAX, \
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unsigned short: USHRT_MAX, \
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unsigned int: UINT_MAX, \
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unsigned long: ULONG_MAX, \
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unsigned long long: ULLONG_MAX, \
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default: LARGEST_INT)
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# define min_int_value(I) \
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_Generic((I), \
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signed char: SCHAR_MIN, \
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short: SHRT_MIN, \
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int: INT_MIN, \
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long: LONG_MIN, \
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long long: LLONG_MIN, \
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default: 0)
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# define ckd_add(R, A, B) \
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((((A) > 0) && ((B) > max_int_value(*(R)) - (A))) \
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? (*(R) = ((A) + min_int_value(*(R))) + ((B) + min_int_value(*(R))), TRUE) \
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: ((((A) < 0) && ((B) < min_int_value(*(R)) - (A))) \
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? (*(R) = ((A) - min_int_value(*(R))) + ((B) - min_int_value(*(R))), TRUE) \
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: (*(R) = ((A) + (B)), FALSE)))
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# define ckd_sub(R, A, B) ckd_add((R), (A), -(B))
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/* Lazy implementation: only works for 32-bit types */
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# define ckd_mul(R, A, B) (*(R) = (long long)(A) * (B), ((long long)(A) * (B)) > max_int_value(*(R)))
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# endif /* __GNUC__ */
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#endif /* __has_include(<stdckdint.h>) */
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#endif /* TRADSTDC_H */
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