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better (and safer?) way to test native size of type 'int'

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This commit is contained in:
Roberto Ierusalimschy 2014-10-27 14:59:31 -02:00
parent 491103708e
commit 4b2521cd9e
1 changed files with 9 additions and 11 deletions
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20
luaconf.h
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@ -1,5 +1,5 @@
/* /*
** $Id: luaconf.h,v 1.220 2014/10/21 14:38:46 roberto Exp roberto $ ** $Id: luaconf.h,v 1.221 2014/10/24 11:42:47 roberto Exp roberto $
** Configuration file for Lua ** Configuration file for Lua
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -417,23 +417,21 @@
/* /*
@@ LUAI_BITSINT defines the number of bits in an int. @@ LUAI_BITSINT defines the (minimum) number of bits in an int.
** CHANGE here if Lua cannot automatically detect the number of bits of ** CHANGE here if Lua cannot automatically detect the number of bits of
** your machine. Probably you do not need to change this. ** your machine. Probably you do not need to change this.
*/ */
/* avoid overflows in comparison */ /* avoid undefined shifts */
#if INT_MAX-20 < 32760 /* { */ #if ((INT_MAX >> 15) >> 15) >= 1
#define LUAI_BITSINT 16
#elif INT_MAX > 2147483640L /* }{ */
/* int has at least 32 bits */
#define LUAI_BITSINT 32 #define LUAI_BITSINT 32
#else /* }{ */ #else
#error "you must define LUA_BITSINT with number of bits in an integer" /* 'int' always must have at least 16 bits */
#endif /* } */ #define LUAI_BITSINT 16
#endif
/* /*
@@ LUA_INT32 is an signed integer with exactly 32 bits. @@ LUA_INT32 is a signed integer with at least 32 bits.
@@ LUAI_UMEM is an unsigned integer big enough to count the total @@ LUAI_UMEM is an unsigned integer big enough to count the total
@@ memory used by Lua. @@ memory used by Lua.
@@ LUAI_MEM is a signed integer big enough to count the total memory @@ LUAI_MEM is a signed integer big enough to count the total memory