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@ -1,5 +1,5 @@ |
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/*
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** $Id: lstrlib.c,v 1.186 2014/02/25 14:30:21 roberto Exp roberto $ |
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** $Id: lstrlib.c,v 1.187 2014/03/12 18:09:06 roberto Exp roberto $ |
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** Standard library for string operations and pattern-matching |
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** See Copyright Notice in lua.h |
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*/ |
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@ -1005,7 +1005,7 @@ static int packint (char *buff, lua_Integer n, int littleendian, int size) { |
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} |
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buff[i] = (n & MC); /* last byte */ |
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/* test for overflow: OK if there are only zeros left in higher bytes,
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or if there are only oneś left and packed number is negative (signal |
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or if there are only ones left and packed number is negative (signal |
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bit, the higher bit in last byte, is one) */ |
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return ((n & ~MC) == 0 || (n | SM) == ~(lua_Integer)0); |
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} |
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@ -1027,7 +1027,7 @@ static int packint_l (lua_State *L) { |
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/* mask to check higher-order byte in a Lua integer */ |
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#define HIGHERBYTE (MC << (NB * (SZINT - 1))) |
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/* mask to check higher-order byte + signal bit of next byte */ |
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/* mask to check higher-order byte + signal bit of next (lower) byte */ |
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#define HIGHERBYTE1 (HIGHERBYTE | (HIGHERBYTE >> 1)) |
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static int unpackint (const char *buff, lua_Integer *res, |
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@ -1037,12 +1037,12 @@ static int unpackint (const char *buff, lua_Integer *res, |
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for (i = 0; i < size; i++) { |
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if (i >= SZINT) { /* will throw away a byte? */ |
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/* check for overflow: it is OK to throw away leading zeros for a
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positive number; leading ones for a negative number; and one |
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last leading zero to allow unsigned integers with a 1 in |
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positive number, leading ones for a negative number, and a |
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leading zero byte to allow unsigned integers with a 1 in |
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its "signal bit" */ |
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if (!((n & HIGHERBYTE1) == 0 || /* zeros for pos. number */ |
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(n & HIGHERBYTE1) == HIGHERBYTE1 || /* ones for neg. number */ |
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((n & HIGHERBYTE) == 0 && i == size - 1))) /* last zero */ |
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if (!((n & HIGHERBYTE1) == 0 || /* zeros for positive number */ |
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(n & HIGHERBYTE1) == HIGHERBYTE1 || /* ones for negative number */ |
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((n & HIGHERBYTE) == 0 && i == size - 1))) /* leading zero */ |
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return 0; /* overflow */ |
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} |
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n <<= NB; |
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