FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lobject.c

     /*
     ** $Id: lobject.c,v 2.58.1.1 2013/04/12 18:48:47 roberto Exp $
     ** Some generic functions over Lua objects
     ** See Copyright Notice in lua.h
     */
     
     #define lobject_c
     #define LUA_CORE
     
    #include <sys/lua/lua.h>
    
    #include "lctype.h"
    #include "ldebug.h"
    #include "ldo.h"
    #include "lmem.h"
    #include "lobject.h"
    #include "lstate.h"
    #include "lstring.h"
    #include "lvm.h"
    
    
    
    LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT};
    
    
    /*
    ** 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);
    }
    
    
    /* converts back */
    int luaO_fb2int (int x) {
      int e = (x >> 3) & 0x1f;
      if (e == 0) return x;
      else return ((x & 7) + 8) << (e - 1);
    }
    
    
    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];
    }
    
    
    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;
      }
    }
    
    
    int luaO_hexavalue (int c) {
      if (lisdigit(c)) return c - '';
      else return ltolower(c) - 'a' + 10;
    }
    
    
    #if !defined(lua_strx2number)
    
    
    
    static int isneg (const char **s) {
      if (**s == '-') { (*s)++; return 1; }
      else if (**s == '+') (*s)++;
      return 0;
    }
    
    
    static lua_Number readhexa (const char **s, lua_Number r, int *count) {
     for (; lisxdigit(cast_uchar(**s)); (*s)++) {  /* read integer part */
       r = (r * cast_num(16.0)) + cast_num(luaO_hexavalue(cast_uchar(**s)));
       (*count)++;
     }
     return r;
   }
   
   
   /*
   ** 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 == '' && (*(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++) - '';
       if (neg1) exp1 = -exp1;
       e += exp1;
     }
     *endptr = cast(char *, s);  /* valid up to here */
    ret:
     if (neg) r = -r;
     return ((e >= 0) ? (r * (1ULL << e)) : (r / (1ULL << -e)));
   }
   
   #endif
   
   
   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 */
   }
   
   
   
   static void pushstr (lua_State *L, const char *str, size_t l) {
     setsvalue2s(L, L->top++, luaS_newlstr(L, str, 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 = 0;
     for (;;) {
       const char *e = strchr(fmt, '%');
       if (e == NULL) break;
       luaD_checkstack(L, 2);  /* fmt + item */
       pushstr(L, fmt, e - fmt);
       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)));
           break;
         }
         case 'f': {
           setnvalue(L->top++, cast_num(va_arg(argp, l_uacNumber)));
           break;
         }
         case 'p': {
           char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
           int l = lcompat_sprintf(buff, sizeof(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;
     }
     luaD_checkstack(L, 1);
     pushstr(L, fmt, strlen(fmt));
     if (n > 0) luaV_concat(L, n + 1);
     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;
   }
   
   
   /* number of chars of a literal string without the ending \0 */
   #define LL(x)   (sizeof(x)/sizeof(char) - 1)
   
   #define RETS    "..."
   #define PRE     "[string \""
   #define POS     "\"]"
   
   #define addstr(a,b,l)   ( memcpy(a,b,(l) * sizeof(char)), a += (l) )
   
   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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