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Diffstat (limited to 'src/lib/lua/lbitlib.c')
-rw-r--r--src/lib/lua/lbitlib.c205
1 files changed, 102 insertions, 103 deletions
diff --git a/src/lib/lua/lbitlib.c b/src/lib/lua/lbitlib.c
index 9637532e3d8..e7ffb051658 100644
--- a/src/lib/lua/lbitlib.c
+++ b/src/lib/lua/lbitlib.c
@@ -15,18 +15,18 @@
/* number of bits to consider in a number */
#if !defined(LUA_NBITS)
-#define LUA_NBITS 32
+#define LUA_NBITS 32
#endif
-#define ALLONES (~(((~(lua_Unsigned)0) << (LUA_NBITS - 1)) << 1))
+#define ALLONES (~(((~(lua_Unsigned)0) << (LUA_NBITS - 1)) << 1))
/* macro to trim extra bits */
-#define trim(x) ((x) & ALLONES)
+#define trim(x) ((x) & ALLONES)
/* builds a number with 'n' ones (1 <= n <= LUA_NBITS) */
-#define mask(n) (~((ALLONES << 1) << ((n) - 1)))
+#define mask(n) (~((ALLONES << 1) << ((n) - 1)))
typedef lua_Unsigned b_uint;
@@ -34,114 +34,114 @@ typedef lua_Unsigned b_uint;
static b_uint andaux (lua_State *L) {
- int i, n = lua_gettop(L);
- b_uint r = ~(b_uint)0;
- for (i = 1; i <= n; i++)
- r &= luaL_checkunsigned(L, i);
- return trim(r);
+ int i, n = lua_gettop(L);
+ b_uint r = ~(b_uint)0;
+ for (i = 1; i <= n; i++)
+ r &= luaL_checkunsigned(L, i);
+ return trim(r);
}
static int b_and (lua_State *L) {
- b_uint r = andaux(L);
- lua_pushunsigned(L, r);
- return 1;
+ b_uint r = andaux(L);
+ lua_pushunsigned(L, r);
+ return 1;
}
static int b_test (lua_State *L) {
- b_uint r = andaux(L);
- lua_pushboolean(L, r != 0);
- return 1;
+ b_uint r = andaux(L);
+ lua_pushboolean(L, r != 0);
+ return 1;
}
static int b_or (lua_State *L) {
- int i, n = lua_gettop(L);
- b_uint r = 0;
- for (i = 1; i <= n; i++)
- r |= luaL_checkunsigned(L, i);
- lua_pushunsigned(L, trim(r));
- return 1;
+ int i, n = lua_gettop(L);
+ b_uint r = 0;
+ for (i = 1; i <= n; i++)
+ r |= luaL_checkunsigned(L, i);
+ lua_pushunsigned(L, trim(r));
+ return 1;
}
static int b_xor (lua_State *L) {
- int i, n = lua_gettop(L);
- b_uint r = 0;
- for (i = 1; i <= n; i++)
- r ^= luaL_checkunsigned(L, i);
- lua_pushunsigned(L, trim(r));
- return 1;
+ int i, n = lua_gettop(L);
+ b_uint r = 0;
+ for (i = 1; i <= n; i++)
+ r ^= luaL_checkunsigned(L, i);
+ lua_pushunsigned(L, trim(r));
+ return 1;
}
static int b_not (lua_State *L) {
- b_uint r = ~luaL_checkunsigned(L, 1);
- lua_pushunsigned(L, trim(r));
- return 1;
+ b_uint r = ~luaL_checkunsigned(L, 1);
+ lua_pushunsigned(L, trim(r));
+ return 1;
}
static int b_shift (lua_State *L, b_uint r, int i) {
- if (i < 0) { /* shift right? */
- i = -i;
- r = trim(r);
- if (i >= LUA_NBITS) r = 0;
- else r >>= i;
- }
- else { /* shift left */
- if (i >= LUA_NBITS) r = 0;
- else r <<= i;
- r = trim(r);
- }
- lua_pushunsigned(L, r);
- return 1;
+ if (i < 0) { /* shift right? */
+ i = -i;
+ r = trim(r);
+ if (i >= LUA_NBITS) r = 0;
+ else r >>= i;
+ }
+ else { /* shift left */
+ if (i >= LUA_NBITS) r = 0;
+ else r <<= i;
+ r = trim(r);
+ }
+ lua_pushunsigned(L, r);
+ return 1;
}
static int b_lshift (lua_State *L) {
- return b_shift(L, luaL_checkunsigned(L, 1), luaL_checkint(L, 2));
+ return b_shift(L, luaL_checkunsigned(L, 1), luaL_checkint(L, 2));
}
static int b_rshift (lua_State *L) {
- return b_shift(L, luaL_checkunsigned(L, 1), -luaL_checkint(L, 2));
+ return b_shift(L, luaL_checkunsigned(L, 1), -luaL_checkint(L, 2));
}
static int b_arshift (lua_State *L) {
- b_uint r = luaL_checkunsigned(L, 1);
- int i = luaL_checkint(L, 2);
- if (i < 0 || !(r & ((b_uint)1 << (LUA_NBITS - 1))))
- return b_shift(L, r, -i);
- else { /* arithmetic shift for 'negative' number */
- if (i >= LUA_NBITS) r = ALLONES;
- else
- r = trim((r >> i) | ~(~(b_uint)0 >> i)); /* add signal bit */
- lua_pushunsigned(L, r);
- return 1;
- }
+ b_uint r = luaL_checkunsigned(L, 1);
+ int i = luaL_checkint(L, 2);
+ if (i < 0 || !(r & ((b_uint)1 << (LUA_NBITS - 1))))
+ return b_shift(L, r, -i);
+ else { /* arithmetic shift for 'negative' number */
+ if (i >= LUA_NBITS) r = ALLONES;
+ else
+ r = trim((r >> i) | ~(~(b_uint)0 >> i)); /* add signal bit */
+ lua_pushunsigned(L, r);
+ return 1;
+ }
}
static int b_rot (lua_State *L, int i) {
- b_uint r = luaL_checkunsigned(L, 1);
- i &= (LUA_NBITS - 1); /* i = i % NBITS */
- r = trim(r);
- r = (r << i) | (r >> (LUA_NBITS - i));
- lua_pushunsigned(L, trim(r));
- return 1;
+ b_uint r = luaL_checkunsigned(L, 1);
+ i &= (LUA_NBITS - 1); /* i = i % NBITS */
+ r = trim(r);
+ r = (r << i) | (r >> (LUA_NBITS - i));
+ lua_pushunsigned(L, trim(r));
+ return 1;
}
static int b_lrot (lua_State *L) {
- return b_rot(L, luaL_checkint(L, 2));
+ return b_rot(L, luaL_checkint(L, 2));
}
static int b_rrot (lua_State *L) {
- return b_rot(L, -luaL_checkint(L, 2));
+ return b_rot(L, -luaL_checkint(L, 2));
}
@@ -152,60 +152,59 @@ static int b_rrot (lua_State *L) {
** 'width' being used uninitialized.)
*/
static int fieldargs (lua_State *L, int farg, int *width) {
- int f = luaL_checkint(L, farg);
- int w = luaL_optint(L, farg + 1, 1);
- luaL_argcheck(L, 0 <= f, farg, "field cannot be negative");
- luaL_argcheck(L, 0 < w, farg + 1, "width must be positive");
- if (f + w > LUA_NBITS)
- luaL_error(L, "trying to access non-existent bits");
- *width = w;
- return f;
+ int f = luaL_checkint(L, farg);
+ int w = luaL_optint(L, farg + 1, 1);
+ luaL_argcheck(L, 0 <= f, farg, "field cannot be negative");
+ luaL_argcheck(L, 0 < w, farg + 1, "width must be positive");
+ if (f + w > LUA_NBITS)
+ luaL_error(L, "trying to access non-existent bits");
+ *width = w;
+ return f;
}
static int b_extract (lua_State *L) {
- int w;
- b_uint r = luaL_checkunsigned(L, 1);
- int f = fieldargs(L, 2, &w);
- r = (r >> f) & mask(w);
- lua_pushunsigned(L, r);
- return 1;
+ int w;
+ b_uint r = luaL_checkunsigned(L, 1);
+ int f = fieldargs(L, 2, &w);
+ r = (r >> f) & mask(w);
+ lua_pushunsigned(L, r);
+ return 1;
}
static int b_replace (lua_State *L) {
- int w;
- b_uint r = luaL_checkunsigned(L, 1);
- b_uint v = luaL_checkunsigned(L, 2);
- int f = fieldargs(L, 3, &w);
- int m = mask(w);
- v &= m; /* erase bits outside given width */
- r = (r & ~(m << f)) | (v << f);
- lua_pushunsigned(L, r);
- return 1;
+ int w;
+ b_uint r = luaL_checkunsigned(L, 1);
+ b_uint v = luaL_checkunsigned(L, 2);
+ int f = fieldargs(L, 3, &w);
+ int m = mask(w);
+ v &= m; /* erase bits outside given width */
+ r = (r & ~(m << f)) | (v << f);
+ lua_pushunsigned(L, r);
+ return 1;
}
static const luaL_Reg bitlib[] = {
- {"arshift", b_arshift},
- {"band", b_and},
- {"bnot", b_not},
- {"bor", b_or},
- {"bxor", b_xor},
- {"btest", b_test},
- {"extract", b_extract},
- {"lrotate", b_lrot},
- {"lshift", b_lshift},
- {"replace", b_replace},
- {"rrotate", b_rrot},
- {"rshift", b_rshift},
- {NULL, NULL}
+ {"arshift", b_arshift},
+ {"band", b_and},
+ {"bnot", b_not},
+ {"bor", b_or},
+ {"bxor", b_xor},
+ {"btest", b_test},
+ {"extract", b_extract},
+ {"lrotate", b_lrot},
+ {"lshift", b_lshift},
+ {"replace", b_replace},
+ {"rrotate", b_rrot},
+ {"rshift", b_rshift},
+ {NULL, NULL}
};
LUAMOD_API int luaopen_bit32 (lua_State *L) {
- luaL_newlib(L, bitlib);
- return 1;
+ luaL_newlib(L, bitlib);
+ return 1;
}
-