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/*\ 
||| This file a part of Pike, and is copyright by Fredrik Hubinette 
||| Pike is distributed as GPL (General Public License) 
||| See the files COPYING and DISCLAIMER for more information. 
\*/ 
 
/* 
 * $Id: stuff.c,v 1.12 2000/08/10 09:20:00 grubba Exp $ 
 */ 
#include "global.h" 
#include "stuff.h" 
#include "stralloc.h" 
 
/* Not all of these are primes, but they should be adequate */ 
PMOD_EXPORT INT32 hashprimes[32] = 
{ 
  31,        /* ~ 2^0  = 1 */ 
  31,        /* ~ 2^1  = 2 */ 
  31,        /* ~ 2^2  = 4 */ 
  31,        /* ~ 2^3  = 8 */ 
  31,        /* ~ 2^4  = 16 */ 
  31,        /* ~ 2^5  = 32 */ 
  61,        /* ~ 2^6  = 64 */ 
  127,       /* ~ 2^7  = 128 */ 
  251,       /* ~ 2^8  = 256 */ 
  541,       /* ~ 2^9  = 512 */ 
  1151,      /* ~ 2^10 = 1024 */ 
  2111,      /* ~ 2^11 = 2048 */ 
  4327,      /* ~ 2^12 = 4096 */ 
  8803,      /* ~ 2^13 = 8192 */ 
  17903,     /* ~ 2^14 = 16384 */ 
  32321,     /* ~ 2^15 = 32768 */ 
  65599,     /* ~ 2^16 = 65536 */ 
  133153,    /* ~ 2^17 = 131072 */ 
  270001,    /* ~ 2^18 = 264144 */ 
  547453,    /* ~ 2^19 = 524288 */ 
  1109891,   /* ~ 2^20 = 1048576 */ 
  2000143,   /* ~ 2^21 = 2097152 */ 
  4561877,   /* ~ 2^22 = 4194304 */ 
  9248339,   /* ~ 2^23 = 8388608 */ 
  16777215,  /* ~ 2^24 = 16777216 */ 
  33554431,  /* ~ 2^25 = 33554432 */ 
  67108863,  /* ~ 2^26 = 67108864 */ 
  134217727, /* ~ 2^27 = 134217728 */ 
  268435455, /* ~ 2^28 = 268435456 */ 
  536870911, /* ~ 2^29 = 536870912 */ 
  1073741823,/* ~ 2^30 = 1073741824 */ 
  2147483647,/* ~ 2^31 = 2147483648 */ 
}; 
 
/* same thing as (int)floor(log((double)x) / log(2.0)) */ 
/* Except a bit quicker :) (hopefully) */ 
 
PMOD_EXPORT int my_log2(size_t x) 
{ 
  static signed char bit[256] = 
  { 
    -1, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,  
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,  
     5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,  
     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,  
     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,  
     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,  
  }; 
  register size_t tmp; 
#if SIZEOF_CHAR_P > 4 
  if((tmp=(x>>32))) 
  { 
    if((x=(tmp>>16))) { 
      if((tmp=(x>>8))) return bit[tmp]+56; 
      return bit[x]+48; 
    } 
    if((x=(tmp>>8))) return bit[x]+40; 
    return bit[tmp]+32; 
  } 
#endif /* SIZEOF_CHAP_P > 4 */ 
  if((tmp=(x>>16))) 
  { 
    if((x=(tmp>>8))) return bit[x]+24; 
    return bit[tmp]+16; 
  } 
  if((tmp=(x>>8))) return bit[tmp]+8; 
  return bit[x]; 
} 
 
 
/* Return the number of bits in a 32-bit integer */ 
PMOD_EXPORT int count_bits(unsigned INT32 x) 
{ 
#define B(X) X+0,X+1,X+1,X+2,\ 
             X+1,X+2,X+2,X+3,\ 
             X+1,X+2,X+2,X+3,\ 
             X+2,X+3,X+3,X+4 
  static char bits[256] = 
  { 
    B(0), B(1), B(1), B(2), 
    B(1), B(2), B(2), B(3), 
    B(1), B(2), B(2), B(3), 
    B(2), B(3), B(3), B(4) 
  }; 
 
  return (bits[x & 255] + 
          bits[(x>>8) & 255] + 
          bits[(x>>16) & 255] + 
          bits[(x>>24) & 255]); 
} 
 
/* Return true for integers with more than one bit set */ 
PMOD_EXPORT int is_more_than_one_bit(unsigned INT32 x) 
{ 
  return !!(x & (x-1)); 
} 
 
PMOD_EXPORT double my_strtod(char *nptr, char **endptr) 
{ 
  double tmp=STRTOD(nptr,endptr); 
  if(*endptr>nptr) 
  { 
    if(endptr[0][-1]=='.') 
      endptr[0]--; 
  } 
  return tmp; 
}