forked from mia/Aegisub
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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** Bit manipulation library.
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** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
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*/
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#define lib_bit_c
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#define LUA_LIB
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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#include "lj_obj.h"
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#include "lj_err.h"
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#include "lj_str.h"
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#include "lj_lib.h"
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/* ------------------------------------------------------------------------ */
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#define LJLIB_MODULE_bit
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LJLIB_ASM(bit_tobit) LJLIB_REC(bit_unary IR_TOBIT)
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{
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lj_lib_checknumber(L, 1);
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return FFH_RETRY;
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}
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LJLIB_ASM_(bit_bnot) LJLIB_REC(bit_unary IR_BNOT)
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LJLIB_ASM_(bit_bswap) LJLIB_REC(bit_unary IR_BSWAP)
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LJLIB_ASM(bit_lshift) LJLIB_REC(bit_shift IR_BSHL)
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{
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lj_lib_checknumber(L, 1);
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lj_lib_checkbit(L, 2);
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return FFH_RETRY;
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}
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LJLIB_ASM_(bit_rshift) LJLIB_REC(bit_shift IR_BSHR)
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LJLIB_ASM_(bit_arshift) LJLIB_REC(bit_shift IR_BSAR)
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LJLIB_ASM_(bit_rol) LJLIB_REC(bit_shift IR_BROL)
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LJLIB_ASM_(bit_ror) LJLIB_REC(bit_shift IR_BROR)
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LJLIB_ASM(bit_band) LJLIB_REC(bit_nary IR_BAND)
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{
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int i = 0;
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do { lj_lib_checknumber(L, ++i); } while (L->base+i < L->top);
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return FFH_RETRY;
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}
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LJLIB_ASM_(bit_bor) LJLIB_REC(bit_nary IR_BOR)
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LJLIB_ASM_(bit_bxor) LJLIB_REC(bit_nary IR_BXOR)
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/* ------------------------------------------------------------------------ */
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LJLIB_CF(bit_tohex)
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{
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uint32_t b = (uint32_t)lj_lib_checkbit(L, 1);
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int32_t i, n = L->base+1 >= L->top ? 8 : lj_lib_checkbit(L, 2);
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const char *hexdigits = "0123456789abcdef";
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char buf[8];
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if (n < 0) { n = -n; hexdigits = "0123456789ABCDEF"; }
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if (n > 8) n = 8;
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for (i = n; --i >= 0; ) { buf[i] = hexdigits[b & 15]; b >>= 4; }
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lua_pushlstring(L, buf, (size_t)n);
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return 1;
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}
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/* ------------------------------------------------------------------------ */
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#include "lj_libdef.h"
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LUALIB_API int luaopen_bit(lua_State *L)
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{
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LJ_LIB_REG(L, LUA_BITLIBNAME, bit);
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return 1;
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}
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