xref: /freebsd/sys/contrib/openzfs/module/lua/lobject.c (revision bb2d13b686e3ccf6c3ccb36209dfb7dcc108b182)
1eda14cbcSMatt Macy /*
2eda14cbcSMatt Macy ** $Id: lobject.c,v 2.58.1.1 2013/04/12 18:48:47 roberto Exp $
3eda14cbcSMatt Macy ** Some generic functions over Lua objects
4eda14cbcSMatt Macy ** See Copyright Notice in lua.h
5eda14cbcSMatt Macy */
6eda14cbcSMatt Macy 
7eda14cbcSMatt Macy #define lobject_c
8eda14cbcSMatt Macy #define LUA_CORE
9eda14cbcSMatt Macy 
10eda14cbcSMatt Macy #include <sys/lua/lua.h>
11eda14cbcSMatt Macy 
12eda14cbcSMatt Macy #include "lctype.h"
13eda14cbcSMatt Macy #include "ldebug.h"
14eda14cbcSMatt Macy #include "ldo.h"
15eda14cbcSMatt Macy #include "lmem.h"
16eda14cbcSMatt Macy #include "lobject.h"
17eda14cbcSMatt Macy #include "lstate.h"
18eda14cbcSMatt Macy #include "lstring.h"
19eda14cbcSMatt Macy #include "lvm.h"
20eda14cbcSMatt Macy 
21eda14cbcSMatt Macy 
22eda14cbcSMatt Macy 
23eda14cbcSMatt Macy LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT};
24eda14cbcSMatt Macy 
25eda14cbcSMatt Macy 
26eda14cbcSMatt Macy /*
27eda14cbcSMatt Macy ** converts an integer to a "floating point byte", represented as
28eda14cbcSMatt Macy ** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
29eda14cbcSMatt Macy ** eeeee != 0 and (xxx) otherwise.
30eda14cbcSMatt Macy */
31eda14cbcSMatt Macy int luaO_int2fb (unsigned int x) {
32eda14cbcSMatt Macy   int e = 0;  /* exponent */
33eda14cbcSMatt Macy   if (x < 8) return x;
34eda14cbcSMatt Macy   while (x >= 0x10) {
35eda14cbcSMatt Macy     x = (x+1) >> 1;
36eda14cbcSMatt Macy     e++;
37eda14cbcSMatt Macy   }
38eda14cbcSMatt Macy   return ((e+1) << 3) | (cast_int(x) - 8);
39eda14cbcSMatt Macy }
40eda14cbcSMatt Macy 
41eda14cbcSMatt Macy 
42eda14cbcSMatt Macy /* converts back */
43eda14cbcSMatt Macy int luaO_fb2int (int x) {
44eda14cbcSMatt Macy   int e = (x >> 3) & 0x1f;
45eda14cbcSMatt Macy   if (e == 0) return x;
46eda14cbcSMatt Macy   else return ((x & 7) + 8) << (e - 1);
47eda14cbcSMatt Macy }
48eda14cbcSMatt Macy 
49eda14cbcSMatt Macy 
50eda14cbcSMatt Macy int luaO_ceillog2 (unsigned int x) {
51eda14cbcSMatt Macy   static const lu_byte log_2[256] = {
52eda14cbcSMatt Macy     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,
53eda14cbcSMatt Macy     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,
54eda14cbcSMatt Macy     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,
55eda14cbcSMatt Macy     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,
56eda14cbcSMatt Macy     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,
57eda14cbcSMatt Macy     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,
58eda14cbcSMatt Macy     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,
59eda14cbcSMatt Macy     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
60eda14cbcSMatt Macy   };
61eda14cbcSMatt Macy   int l = 0;
62eda14cbcSMatt Macy   x--;
63eda14cbcSMatt Macy   while (x >= 256) { l += 8; x >>= 8; }
64eda14cbcSMatt Macy   return l + log_2[x];
65eda14cbcSMatt Macy }
66eda14cbcSMatt Macy 
67eda14cbcSMatt Macy 
68eda14cbcSMatt Macy lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2) {
69eda14cbcSMatt Macy   switch (op) {
70eda14cbcSMatt Macy     case LUA_OPADD: return luai_numadd(NULL, v1, v2);
71eda14cbcSMatt Macy     case LUA_OPSUB: return luai_numsub(NULL, v1, v2);
72eda14cbcSMatt Macy     case LUA_OPMUL: return luai_nummul(NULL, v1, v2);
73eda14cbcSMatt Macy     case LUA_OPDIV: return luai_numdiv(NULL, v1, v2);
74eda14cbcSMatt Macy     case LUA_OPMOD: return luai_nummod(NULL, v1, v2);
75eda14cbcSMatt Macy     case LUA_OPPOW: return luai_numpow(NULL, v1, v2);
76eda14cbcSMatt Macy     case LUA_OPUNM: return luai_numunm(NULL, v1);
77eda14cbcSMatt Macy     default: lua_assert(0); return 0;
78eda14cbcSMatt Macy   }
79eda14cbcSMatt Macy }
80eda14cbcSMatt Macy 
81eda14cbcSMatt Macy 
82eda14cbcSMatt Macy int luaO_hexavalue (int c) {
83eda14cbcSMatt Macy   if (lisdigit(c)) return c - '0';
84eda14cbcSMatt Macy   else return ltolower(c) - 'a' + 10;
85eda14cbcSMatt Macy }
86eda14cbcSMatt Macy 
87eda14cbcSMatt Macy 
88eda14cbcSMatt Macy #if !defined(lua_strx2number)
89eda14cbcSMatt Macy 
90eda14cbcSMatt Macy 
91eda14cbcSMatt Macy 
92eda14cbcSMatt Macy static int isneg (const char **s) {
93eda14cbcSMatt Macy   if (**s == '-') { (*s)++; return 1; }
94eda14cbcSMatt Macy   else if (**s == '+') (*s)++;
95eda14cbcSMatt Macy   return 0;
96eda14cbcSMatt Macy }
97eda14cbcSMatt Macy 
98eda14cbcSMatt Macy 
99eda14cbcSMatt Macy static lua_Number readhexa (const char **s, lua_Number r, int *count) {
100eda14cbcSMatt Macy   for (; lisxdigit(cast_uchar(**s)); (*s)++) {  /* read integer part */
101eda14cbcSMatt Macy     r = (r * cast_num(16.0)) + cast_num(luaO_hexavalue(cast_uchar(**s)));
102eda14cbcSMatt Macy     (*count)++;
103eda14cbcSMatt Macy   }
104eda14cbcSMatt Macy   return r;
105eda14cbcSMatt Macy }
106eda14cbcSMatt Macy 
107eda14cbcSMatt Macy 
108eda14cbcSMatt Macy /*
109eda14cbcSMatt Macy ** convert an hexadecimal numeric string to a number, following
110eda14cbcSMatt Macy ** C99 specification for 'strtod'
111eda14cbcSMatt Macy */
112eda14cbcSMatt Macy static lua_Number lua_strx2number (const char *s, char **endptr) {
113eda14cbcSMatt Macy   lua_Number r = 0.0;
114eda14cbcSMatt Macy   int e = 0, i = 0;
115eda14cbcSMatt Macy   int neg = 0;  /* 1 if number is negative */
116eda14cbcSMatt Macy   *endptr = cast(char *, s);  /* nothing is valid yet */
117eda14cbcSMatt Macy   while (lisspace(cast_uchar(*s))) s++;  /* skip initial spaces */
118eda14cbcSMatt Macy   neg = isneg(&s);  /* check signal */
119eda14cbcSMatt Macy   if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X')))  /* check '0x' */
120eda14cbcSMatt Macy     return 0.0;  /* invalid format (no '0x') */
121eda14cbcSMatt Macy   s += 2;  /* skip '0x' */
122eda14cbcSMatt Macy   r = readhexa(&s, r, &i);  /* read integer part */
123eda14cbcSMatt Macy   if (*s == '.') {
124eda14cbcSMatt Macy     s++;  /* skip dot */
125eda14cbcSMatt Macy     r = readhexa(&s, r, &e);  /* read fractional part */
126eda14cbcSMatt Macy   }
127eda14cbcSMatt Macy   if (i == 0 && e == 0)
128eda14cbcSMatt Macy     return 0.0;  /* invalid format (no digit) */
129eda14cbcSMatt Macy   e *= -4;  /* each fractional digit divides value by 2^-4 */
130eda14cbcSMatt Macy   *endptr = cast(char *, s);  /* valid up to here */
131eda14cbcSMatt Macy   if (*s == 'p' || *s == 'P') {  /* exponent part? */
132eda14cbcSMatt Macy     int exp1 = 0;
133eda14cbcSMatt Macy     int neg1;
134eda14cbcSMatt Macy     s++;  /* skip 'p' */
135eda14cbcSMatt Macy     neg1 = isneg(&s);  /* signal */
136eda14cbcSMatt Macy     if (!lisdigit(cast_uchar(*s)))
137eda14cbcSMatt Macy       goto ret;  /* must have at least one digit */
138eda14cbcSMatt Macy     while (lisdigit(cast_uchar(*s)))  /* read exponent */
139eda14cbcSMatt Macy       exp1 = exp1 * 10 + *(s++) - '0';
140eda14cbcSMatt Macy     if (neg1) exp1 = -exp1;
141eda14cbcSMatt Macy     e += exp1;
142eda14cbcSMatt Macy   }
143eda14cbcSMatt Macy   *endptr = cast(char *, s);  /* valid up to here */
144eda14cbcSMatt Macy  ret:
145eda14cbcSMatt Macy   if (neg) r = -r;
146*bb2d13b6SMartin Matuska   return ((e >= 0) ? (r * (1ULL << e)) : (r / (1ULL << -e)));
147eda14cbcSMatt Macy }
148eda14cbcSMatt Macy 
149eda14cbcSMatt Macy #endif
150eda14cbcSMatt Macy 
151eda14cbcSMatt Macy 
152eda14cbcSMatt Macy int luaO_str2d (const char *s, size_t len, lua_Number *result) {
153eda14cbcSMatt Macy   char *endptr;
154eda14cbcSMatt Macy   if (strpbrk(s, "nN"))  /* reject 'inf' and 'nan' */
155eda14cbcSMatt Macy     return 0;
156eda14cbcSMatt Macy   else if (strpbrk(s, "xX"))  /* hexa? */
157eda14cbcSMatt Macy     *result = lua_strx2number(s, &endptr);
158eda14cbcSMatt Macy   else
159eda14cbcSMatt Macy     *result = lua_str2number(s, &endptr);
160eda14cbcSMatt Macy   if (endptr == s) return 0;  /* nothing recognized */
161eda14cbcSMatt Macy   while (lisspace(cast_uchar(*endptr))) endptr++;
162eda14cbcSMatt Macy   return (endptr == s + len);  /* OK if no trailing characters */
163eda14cbcSMatt Macy }
164eda14cbcSMatt Macy 
165eda14cbcSMatt Macy 
166eda14cbcSMatt Macy 
167eda14cbcSMatt Macy static void pushstr (lua_State *L, const char *str, size_t l) {
168eda14cbcSMatt Macy   setsvalue2s(L, L->top++, luaS_newlstr(L, str, l));
169eda14cbcSMatt Macy }
170eda14cbcSMatt Macy 
171eda14cbcSMatt Macy 
172eda14cbcSMatt Macy /* this function handles only `%d', `%c', %f, %p, and `%s' formats */
173eda14cbcSMatt Macy const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
174eda14cbcSMatt Macy   int n = 0;
175eda14cbcSMatt Macy   for (;;) {
176eda14cbcSMatt Macy     const char *e = strchr(fmt, '%');
177eda14cbcSMatt Macy     if (e == NULL) break;
178eda14cbcSMatt Macy     luaD_checkstack(L, 2);  /* fmt + item */
179eda14cbcSMatt Macy     pushstr(L, fmt, e - fmt);
180eda14cbcSMatt Macy     switch (*(e+1)) {
181eda14cbcSMatt Macy       case 's': {
182eda14cbcSMatt Macy         const char *s = va_arg(argp, char *);
183eda14cbcSMatt Macy         if (s == NULL) s = "(null)";
184eda14cbcSMatt Macy         pushstr(L, s, strlen(s));
185eda14cbcSMatt Macy         break;
186eda14cbcSMatt Macy       }
187eda14cbcSMatt Macy       case 'c': {
188eda14cbcSMatt Macy         char buff;
189eda14cbcSMatt Macy         buff = cast(char, va_arg(argp, int));
190eda14cbcSMatt Macy         pushstr(L, &buff, 1);
191eda14cbcSMatt Macy         break;
192eda14cbcSMatt Macy       }
193eda14cbcSMatt Macy       case 'd': {
194eda14cbcSMatt Macy         setnvalue(L->top++, cast_num(va_arg(argp, int)));
195eda14cbcSMatt Macy         break;
196eda14cbcSMatt Macy       }
197eda14cbcSMatt Macy       case 'f': {
198eda14cbcSMatt Macy         setnvalue(L->top++, cast_num(va_arg(argp, l_uacNumber)));
199eda14cbcSMatt Macy         break;
200eda14cbcSMatt Macy       }
201eda14cbcSMatt Macy       case 'p': {
202eda14cbcSMatt Macy         char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
203eda14cbcSMatt Macy         int l = lcompat_sprintf(buff, sizeof(buff), "%p", va_arg(argp, void *));
204eda14cbcSMatt Macy         pushstr(L, buff, l);
205eda14cbcSMatt Macy         break;
206eda14cbcSMatt Macy       }
207eda14cbcSMatt Macy       case '%': {
208eda14cbcSMatt Macy         pushstr(L, "%", 1);
209eda14cbcSMatt Macy         break;
210eda14cbcSMatt Macy       }
211eda14cbcSMatt Macy       default: {
212eda14cbcSMatt Macy         luaG_runerror(L,
213eda14cbcSMatt Macy             "invalid option " LUA_QL("%%%c") " to " LUA_QL("lua_pushfstring"),
214eda14cbcSMatt Macy             *(e + 1));
215eda14cbcSMatt Macy       }
216eda14cbcSMatt Macy     }
217eda14cbcSMatt Macy     n += 2;
218eda14cbcSMatt Macy     fmt = e+2;
219eda14cbcSMatt Macy   }
220eda14cbcSMatt Macy   luaD_checkstack(L, 1);
221eda14cbcSMatt Macy   pushstr(L, fmt, strlen(fmt));
222eda14cbcSMatt Macy   if (n > 0) luaV_concat(L, n + 1);
223eda14cbcSMatt Macy   return svalue(L->top - 1);
224eda14cbcSMatt Macy }
225eda14cbcSMatt Macy 
226eda14cbcSMatt Macy 
227eda14cbcSMatt Macy const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
228eda14cbcSMatt Macy   const char *msg;
229eda14cbcSMatt Macy   va_list argp;
230eda14cbcSMatt Macy   va_start(argp, fmt);
231eda14cbcSMatt Macy   msg = luaO_pushvfstring(L, fmt, argp);
232eda14cbcSMatt Macy   va_end(argp);
233eda14cbcSMatt Macy   return msg;
234eda14cbcSMatt Macy }
235eda14cbcSMatt Macy 
236eda14cbcSMatt Macy 
237eda14cbcSMatt Macy /* number of chars of a literal string without the ending \0 */
238eda14cbcSMatt Macy #define LL(x)	(sizeof(x)/sizeof(char) - 1)
239eda14cbcSMatt Macy 
240eda14cbcSMatt Macy #define RETS	"..."
241eda14cbcSMatt Macy #define PRE	"[string \""
242eda14cbcSMatt Macy #define POS	"\"]"
243eda14cbcSMatt Macy 
244eda14cbcSMatt Macy #define addstr(a,b,l)	( memcpy(a,b,(l) * sizeof(char)), a += (l) )
245eda14cbcSMatt Macy 
246eda14cbcSMatt Macy void luaO_chunkid (char *out, const char *source, size_t bufflen) {
247eda14cbcSMatt Macy   size_t l = strlen(source);
248eda14cbcSMatt Macy   if (*source == '=') {  /* 'literal' source */
249eda14cbcSMatt Macy     if (l <= bufflen)  /* small enough? */
250eda14cbcSMatt Macy       memcpy(out, source + 1, l * sizeof(char));
251eda14cbcSMatt Macy     else {  /* truncate it */
252eda14cbcSMatt Macy       addstr(out, source + 1, bufflen - 1);
253eda14cbcSMatt Macy       *out = '\0';
254eda14cbcSMatt Macy     }
255eda14cbcSMatt Macy   }
256eda14cbcSMatt Macy   else if (*source == '@') {  /* file name */
257eda14cbcSMatt Macy     if (l <= bufflen)  /* small enough? */
258eda14cbcSMatt Macy       memcpy(out, source + 1, l * sizeof(char));
259eda14cbcSMatt Macy     else {  /* add '...' before rest of name */
260eda14cbcSMatt Macy       addstr(out, RETS, LL(RETS));
261eda14cbcSMatt Macy       bufflen -= LL(RETS);
262eda14cbcSMatt Macy       memcpy(out, source + 1 + l - bufflen, bufflen * sizeof(char));
263eda14cbcSMatt Macy     }
264eda14cbcSMatt Macy   }
265eda14cbcSMatt Macy   else {  /* string; format as [string "source"] */
266eda14cbcSMatt Macy     const char *nl = strchr(source, '\n');  /* find first new line (if any) */
267eda14cbcSMatt Macy     addstr(out, PRE, LL(PRE));  /* add prefix */
268eda14cbcSMatt Macy     bufflen -= LL(PRE RETS POS) + 1;  /* save space for prefix+suffix+'\0' */
269eda14cbcSMatt Macy     if (l < bufflen && nl == NULL) {  /* small one-line source? */
270eda14cbcSMatt Macy       addstr(out, source, l);  /* keep it */
271eda14cbcSMatt Macy     }
272eda14cbcSMatt Macy     else {
273eda14cbcSMatt Macy       if (nl != NULL) l = nl - source;  /* stop at first newline */
274eda14cbcSMatt Macy       if (l > bufflen) l = bufflen;
275eda14cbcSMatt Macy       addstr(out, source, l);
276eda14cbcSMatt Macy       addstr(out, RETS, LL(RETS));
277eda14cbcSMatt Macy     }
278eda14cbcSMatt Macy     memcpy(out, POS, (LL(POS) + 1) * sizeof(char));
279eda14cbcSMatt Macy   }
280eda14cbcSMatt Macy }
281