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load81/lua/src/lobject.c at master · nopcoder/load81 · GitHub
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/*
** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/
#include
<ctype.h>
#include
<stdarg.h>
#include
<stdio.h>
#include
<stdlib.h>
#include
<string.h>
#define
lobject_c
#define
LUA_CORE
#include
"lua.h"
#include
"ldo.h"
#include
"lmem.h"
#include
"lobject.h"
#include
"lstate.h"
#include
"lstring.h"
#include
"lvm.h"
const
TValue
luaO_nilobject_
=
{{
NULL
},
LUA_TNIL
};
/*
** converts an integer to a "floating point byte", represented as
** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
** eeeee != 0 and (xxx) otherwise.
*/
int
luaO_int2fb
(
unsigned
int
x
) {
int
e
=
0
;
/* expoent */
while
(
x
>=
16
) {
x
=
(
x
+
1
) >>
1
;
e
++
;
}
if
(
x
<
8
)
return
x
;
else
return
((
e
+
1
) <<
3
) | (
cast_int
(
x
)
-
8
);
}
/* converts back */
int
luaO_fb2int
(
int
x
) {
int
e
=
(
x
>>
3
)
&
31
;
if
(
e
==
0
)
return
x
;
else
return
((
x
&
7
)
+
8
) << (
e
-
1
);
}
int
luaO_log2
(
unsigned
int
x
) {
static
const
lu_byte
log_2
[
256
]
=
{
0
,
1
,
2
,
2
,
3
,
3
,
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};
int
l
=
-1
;
while
(
x
>=
256
) {
l
+=
8
;
x
>>=
8
; }
return
l
+
log_2
[
x
];
}
int
luaO_rawequalObj
(
const
TValue
*
t1
,
const
TValue
*
t2
) {
if
(
ttype
(
t1
)
!=
ttype
(
t2
))
return
0
;
else
switch
(
ttype
(
t1
)) {
case
LUA_TNIL
:
return
1
;
case
LUA_TNUMBER
:
return
luai_numeq
(
nvalue
(
t1
),
nvalue
(
t2
));
case
LUA_TBOOLEAN
:
return
bvalue
(
t1
)
==
bvalue
(
t2
);
/* boolean true must be 1 !! */
case
LUA_TLIGHTUSERDATA
:
return
pvalue
(
t1
)
==
pvalue
(
t2
);
default
:
lua_assert
(
iscollectable
(
t1
));
return
gcvalue
(
t1
)
==
gcvalue
(
t2
);
}
}
int
luaO_str2d
(
const
char
*
s
,
lua_Number
*
result
) {
char
*
endptr
;
*
result
=
lua_str2number
(
s
,
&
endptr
);
if
(
endptr
==
s
)
return
0
;
/* conversion failed */
if
(
*
endptr
==
'x'
||
*
endptr
==
'X'
)
/* maybe an hexadecimal constant? */
*
result
=
cast_num
(
strtoul
(
s
,
&
endptr
,
16
));
if
(
*
endptr
==
'\0'
)
return
1
;
/* most common case */
while
(
isspace
(
cast
(
unsigned
char
,
*
endptr
)))
endptr
++
;
if
(
*
endptr
!=
'\0'
)
return
0
;
/* invalid trailing characters? */
return
1
;
}
static
void
pushstr
(
lua_State
*
L
,
const
char
*
str
) {
setsvalue2s
(
L
,
L
->
top
,
luaS_new
(
L
,
str
));
incr_top
(
L
);
}
/* this function handles only `%d', `%c', %f, %p, and `%s' formats */
const
char
*
luaO_pushvfstring
(
lua_State
*
L
,
const
char
*
fmt
,
va_list
argp
) {
int
n
=
1
;
pushstr
(
L
,
""
);
for
(;;) {
const
char
*
e
=
strchr
(
fmt
,
'%'
);
if
(
e
==
NULL
)
break
;
setsvalue2s
(
L
,
L
->
top
,
luaS_newlstr
(
L
,
fmt
,
e
-
fmt
));
incr_top
(
L
);
switch
(
*
(
e
+
1
)) {
case
's'
: {
const
char
*
s
=
va_arg
(
argp
,
char
*
);
if
(
s
==
NULL
)
s
=
"(null)"
;
pushstr
(
L
,
s
);
break
;
}
case
'c'
: {
char
buff
[
2
];
buff
[
0
]
=
cast
(
char
,
va_arg
(
argp
,
int
));
buff
[
1
]
=
'\0'
;
pushstr
(
L
,
buff
);
break
;
}
case
'd'
: {
setnvalue
(
L
->
top
,
cast_num
(
va_arg
(
argp
,
int
)));
incr_top
(
L
);
break
;
}
case
'f'
: {
setnvalue
(
L
->
top
,
cast_num
(
va_arg
(
argp
,
l_uacNumber
)));
incr_top
(
L
);
break
;
}
case
'p'
: {
char
buff
[
4
*
sizeof
(
void
*
)
+
8
];
/* should be enough space for a `%p' */
sprintf
(
buff
,
"%p"
,
va_arg
(
argp
,
void
*
));
pushstr
(
L
,
buff
);
break
;
}
case
'%'
: {
pushstr
(
L
,
"%"
);
break
;
}
default
: {
char
buff
[
3
];
buff
[
0
]
=
'%'
;
buff
[
1
]
=
*
(
e
+
1
);
buff
[
2
]
=
'\0'
;
pushstr
(
L
,
buff
);
break
;
}
}
n
+=
2
;
fmt
=
e
+
2
;
}
pushstr
(
L
,
fmt
);
luaV_concat
(
L
,
n
+
1
,
cast_int
(
L
->
top
-
L
->
base
)
-
1
);
L
->
top
-=
n
;
return
svalue
(
L
->
top
-
1
);
}
const
char
*
luaO_pushfstring
(
lua_State
*
L
,
const
char
*
fmt
, ...) {
const
char
*
msg
;
va_list
argp
;
va_start
(
argp
,
fmt
);
msg
=
luaO_pushvfstring
(
L
,
fmt
,
argp
);
va_end
(
argp
);
return
msg
;
}
void
luaO_chunkid
(
char
*
out
,
const
char
*
source
,
size_t
bufflen
) {
if
(
*
source
==
'='
) {
strncpy
(
out
,
source
+
1
,
bufflen
);
/* remove first char */
out
[
bufflen
-
1
]
=
'\0'
;
/* ensures null termination */
}
else
{
/* out = "source", or "...source" */
if
(
*
source
==
'@'
) {
size_t
l
;
source
++
;
/* skip the `@' */
bufflen
-=
sizeof
(
" '...' "
);
l
=
strlen
(
source
);
strcpy
(
out
,
""
);
if
(
l
>
bufflen
) {
source
+=
(
l
-
bufflen
);
/* get last part of file name */
strcat
(
out
,
"..."
);
}
strcat
(
out
,
source
);
}
else
{
/* out = [string "string"] */
size_t
len
=
strcspn
(
source
,
"\n\r"
);
/* stop at first newline */
bufflen
-=
sizeof
(
" [string \"...\"] "
);
if
(
len
>
bufflen
)
len
=
bufflen
;
strcpy
(
out
,
"[string \""
);
if
(
source
[
len
]
!=
'\0'
) {
/* must truncate? */
strncat
(
out
,
source
,
len
);
strcat
(
out
,
"..."
);
}
else
strcat
(
out
,
source
);
strcat
(
out
,
"\"]"
);
}
}
}
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