0,0 → 1,289 |
/* |
** $Id: lobject.c,v 2.55 2011/11/30 19:30:16 roberto Exp $ |
** Some generic functions over Lua objects |
** See Copyright Notice in lua.h |
*/ |
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#include <stdarg.h> |
#include <stdio.h> |
#include <stdlib.h> |
#include <string.h> |
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#define lobject_c |
#define LUA_CORE |
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#include "lua.h" |
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#include "lctype.h" |
#include "ldebug.h" |
#include "ldo.h" |
#include "lmem.h" |
#include "lobject.h" |
#include "lstate.h" |
#include "lstring.h" |
#include "lvm.h" |
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LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT}; |
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/* |
** 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; /* exponent */ |
if (x < 8) return x; |
while (x >= 0x10) { |
x = (x+1) >> 1; |
e++; |
} |
return ((e+1) << 3) | (cast_int(x) - 8); |
} |
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/* converts back */ |
int luaO_fb2int (int x) { |
int e = (x >> 3) & 0x1f; |
if (e == 0) return x; |
else return ((x & 7) + 8) << (e - 1); |
} |
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int luaO_ceillog2 (unsigned int x) { |
static const lu_byte log_2[256] = { |
0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, |
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, |
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, |
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8 |
}; |
int l = 0; |
x--; |
while (x >= 256) { l += 8; x >>= 8; } |
return l + log_2[x]; |
} |
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lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2) { |
switch (op) { |
case LUA_OPADD: return luai_numadd(NULL, v1, v2); |
case LUA_OPSUB: return luai_numsub(NULL, v1, v2); |
case LUA_OPMUL: return luai_nummul(NULL, v1, v2); |
case LUA_OPDIV: return luai_numdiv(NULL, v1, v2); |
case LUA_OPMOD: return luai_nummod(NULL, v1, v2); |
case LUA_OPPOW: return luai_numpow(NULL, v1, v2); |
case LUA_OPUNM: return luai_numunm(NULL, v1); |
default: lua_assert(0); return 0; |
} |
} |
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int luaO_hexavalue (int c) { |
if (lisdigit(c)) return c - '0'; |
else return ltolower(c) - 'a' + 10; |
} |
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#if !defined(lua_strx2number) |
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#include <math.h> |
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static int isneg (const char **s) { |
if (**s == '-') { (*s)++; return 1; } |
else if (**s == '+') (*s)++; |
return 0; |
} |
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static lua_Number readhexa (const char **s, lua_Number r, int *count) { |
for (; lisxdigit(cast_uchar(**s)); (*s)++) { /* read integer part */ |
r = (r * 16.0) + cast_num(luaO_hexavalue(cast_uchar(**s))); |
(*count)++; |
} |
return r; |
} |
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/* |
** convert an hexadecimal numeric string to a number, following |
** C99 specification for 'strtod' |
*/ |
static lua_Number lua_strx2number (const char *s, char **endptr) { |
lua_Number r = 0.0; |
int e = 0, i = 0; |
int neg = 0; /* 1 if number is negative */ |
*endptr = cast(char *, s); /* nothing is valid yet */ |
while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */ |
neg = isneg(&s); /* check signal */ |
if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */ |
return 0.0; /* invalid format (no '0x') */ |
s += 2; /* skip '0x' */ |
r = readhexa(&s, r, &i); /* read integer part */ |
if (*s == '.') { |
s++; /* skip dot */ |
r = readhexa(&s, r, &e); /* read fractional part */ |
} |
if (i == 0 && e == 0) |
return 0.0; /* invalid format (no digit) */ |
e *= -4; /* each fractional digit divides value by 2^-4 */ |
*endptr = cast(char *, s); /* valid up to here */ |
if (*s == 'p' || *s == 'P') { /* exponent part? */ |
int exp1 = 0; |
int neg1; |
s++; /* skip 'p' */ |
neg1 = isneg(&s); /* signal */ |
if (!lisdigit(cast_uchar(*s))) |
goto ret; /* must have at least one digit */ |
while (lisdigit(cast_uchar(*s))) /* read exponent */ |
exp1 = exp1 * 10 + *(s++) - '0'; |
if (neg1) exp1 = -exp1; |
e += exp1; |
} |
*endptr = cast(char *, s); /* valid up to here */ |
ret: |
if (neg) r = -r; |
return ldexp(r, e); |
} |
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#endif |
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int luaO_str2d (const char *s, size_t len, lua_Number *result) { |
char *endptr; |
if (strpbrk(s, "nN")) /* reject 'inf' and 'nan' */ |
return 0; |
else if (strpbrk(s, "xX")) /* hexa? */ |
*result = lua_strx2number(s, &endptr); |
else |
*result = lua_str2number(s, &endptr); |
if (endptr == s) return 0; /* nothing recognized */ |
while (lisspace(cast_uchar(*endptr))) endptr++; |
return (endptr == s + len); /* OK if no trailing characters */ |
} |
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static void pushstr (lua_State *L, const char *str, size_t l) { |
setsvalue2s(L, L->top, luaS_newlstr(L, str, l)); |
incr_top(L); |
} |
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/* 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 = 0; |
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, strlen(s)); |
break; |
} |
case 'c': { |
char buff; |
buff = cast(char, va_arg(argp, int)); |
pushstr(L, &buff, 1); |
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' */ |
int l = sprintf(buff, "%p", va_arg(argp, void *)); |
pushstr(L, buff, l); |
break; |
} |
case '%': { |
pushstr(L, "%", 1); |
break; |
} |
default: { |
luaG_runerror(L, |
"invalid option " LUA_QL("%%%c") " to " LUA_QL("lua_pushfstring"), |
*(e + 1)); |
} |
} |
n += 2; |
fmt = e+2; |
} |
pushstr(L, fmt, strlen(fmt)); |
if (n > 0) luaV_concat(L, n + 1); |
return svalue(L->top - 1); |
} |
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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; |
} |
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/* number of chars of a literal string without the ending \0 */ |
#define LL(x) (sizeof(x)/sizeof(char) - 1) |
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#define RETS "..." |
#define PRE "[string \"" |
#define POS "\"]" |
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#define addstr(a,b,l) ( memcpy(a,b,(l) * sizeof(char)), a += (l) ) |
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void luaO_chunkid (char *out, const char *source, size_t bufflen) { |
size_t l = strlen(source); |
if (*source == '=') { /* 'literal' source */ |
if (l <= bufflen) /* small enough? */ |
memcpy(out, source + 1, l * sizeof(char)); |
else { /* truncate it */ |
addstr(out, source + 1, bufflen - 1); |
*out = '\0'; |
} |
} |
else if (*source == '@') { /* file name */ |
if (l <= bufflen) /* small enough? */ |
memcpy(out, source + 1, l * sizeof(char)); |
else { /* add '...' before rest of name */ |
addstr(out, RETS, LL(RETS)); |
bufflen -= LL(RETS); |
memcpy(out, source + 1 + l - bufflen, bufflen * sizeof(char)); |
} |
} |
else { /* string; format as [string "source"] */ |
const char *nl = strchr(source, '\n'); /* find first new line (if any) */ |
addstr(out, PRE, LL(PRE)); /* add prefix */ |
bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */ |
if (l < bufflen && nl == NULL) { /* small one-line source? */ |
addstr(out, source, l); /* keep it */ |
} |
else { |
if (nl != NULL) l = nl - source; /* stop at first newline */ |
if (l > bufflen) l = bufflen; |
addstr(out, source, l); |
addstr(out, RETS, LL(RETS)); |
} |
memcpy(out, POS, (LL(POS) + 1) * sizeof(char)); |
} |
} |
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