pike.git/src/stuff.c:fc60d43cf3cf852c5b58d477b6ac895c62b9671c

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For copyright information see COPYRIGHT. || Pike is distributed under GPL, LGPL and MPL. See the file COPYING || for more information. || $Id: stuff.c,v 1.22 2004/05/31 23:51:27 nilsson Exp $ */ #include "global.h" #include "stuff.h" #include "stralloc.h" /* Not all of these are primes, but they should be adequate */ PMOD_EXPORT const 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 const 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 const 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; } PMOD_EXPORT unsigned INT32 my_sqrt(unsigned INT32 n) { unsigned INT32 b, s, y=0; unsigned INT16 x=0; for(b=1<<(sizeof(INT32)*8-2); b; b>>=2) { x<<=1; s=b+y; y>>=1; if(n>=s) { x|=1; y|=b; n-=s; } } return x; } /* This routine basically finds a prime number * which is larger than 'x' */ unsigned long find_good_hash_size(unsigned long num) { static const unsigned long primes[] = { 37UL, 37UL, 37UL, 37UL, 37UL, 37UL, 41UL, 41UL, 41UL, 41UL, 43UL, 43UL, 47UL, 47UL, 47UL, 47UL, 53UL, 53UL, 53UL, 53UL, 53UL, 53UL, 59UL, 59UL, 59UL, 59UL, 59UL, 59UL, 61UL, 61UL, 67UL, 67UL, 67UL, 67UL, 71UL, 71UL, 73UL, 79UL, 79UL, 79UL, 83UL, 83UL, 89UL, 89UL, 89UL, 97UL, 97UL, 97UL, 97UL, 101UL, 101UL, 103UL, 107UL, 107UL, 109UL, 113UL, 113UL, 127UL, 127UL, 127UL, 127UL, 127UL, 127UL, 127UL, 131UL, 137UL, 139UL, 149UL, 149UL, 151UL, 157UL, 163UL, 163UL, 167UL, 173UL, 179UL, 179UL, 191UL, 191UL, 191UL, 197UL, 199UL, 211UL, 211UL, 211UL, 223UL, 223UL, 223UL, 227UL, 233UL, 239UL, 239UL, 251UL, 251UL, 251UL, 257UL, 263UL, 271UL, 281UL, 293UL, 307UL, 307UL, 311UL, 331UL, 331UL, 337UL, 347UL, 353UL, 359UL, 367UL, 379UL, 383UL, 397UL, 401UL, 409UL, 419UL, 431UL, 431UL, 439UL, 449UL, 457UL, 463UL, 479UL, 479UL, 487UL, 499UL, 503UL, 521UL, 541UL, 547UL, 563UL, 577UL, 593UL, 607UL, 631UL, 641UL, 659UL, 673UL, 691UL, 709UL, 719UL, 739UL, 751UL, 769UL, 787UL, 809UL, 821UL, 839UL, 853UL, 863UL, 881UL, 907UL, 911UL, 929UL, 947UL, 967UL, 977UL, 991UL, 1009UL, 1031UL, 1061UL, 1087UL, 1123UL, 1151UL, 1187UL, 1217UL, 1249UL, 1279UL, 1319UL, 1361UL, 1381UL, 1409UL, 1439UL, 1471UL, 1511UL, 1543UL, 1567UL, 1601UL, 1637UL, 1663UL, 1697UL, 1733UL, 1759UL, 1801UL, 1823UL, 1861UL, 1889UL, 1931UL, 1951UL, 1987UL, 2017UL, 2053UL, 2111UL, 2179UL, 2239UL, 2309UL, 2371UL, 2437UL, 2503UL, 2579UL, 2633UL, 2687UL, 2753UL, 2819UL, 2879UL, 2953UL, 3011UL, 3079UL, 3137UL, 3203UL, 3271UL, 3329UL, 3391UL, 3457UL, 3527UL, 3583UL, 3659UL, 3719UL, 3779UL, 3847UL, 3907UL, 3967UL, 4049UL, 4099UL, 4229UL, 4357UL, 4481UL, 4621UL, 4751UL, 4871UL, 4993UL, 5119UL, 5261UL, 5381UL, 5503UL, 5639UL, 5779UL, 5897UL, 6029UL, 6143UL, 6271UL, 6421UL, 6529UL, 6659UL, 6791UL, 6911UL, 7039UL, 7177UL, 7297UL, 7433UL, 7559UL, 7681UL, 7817UL, 7937UL, 8069UL, 8191UL, 8447UL, 8707UL, 8963UL, 9221UL, 9473UL, 9733UL, 10007UL, 10243UL, 10499UL, 10753UL, 11027UL, 11273UL, 11519UL, 11777UL, 12037UL, 12289UL, 12547UL, 12799UL, 13063UL, 13313UL, 13567UL, 13829UL, 14081UL, 14341UL, 14591UL, 14851UL, 15107UL, 15359UL, 15619UL, 15877UL, 16127UL, 16411UL, 16901UL, 17417UL, 17921UL, 18433UL, 18947UL, 19457UL, 19973UL, 20479UL, 21001UL, 21503UL, 22027UL, 22531UL, 23039UL, 23557UL, 24071UL, 24593UL, 25087UL, 25601UL, 26111UL, 26627UL, 27143UL, 27647UL, 28163UL, 28687UL, 29191UL, 29717UL, 30211UL, 30727UL, 31231UL, 31751UL, 32257UL, 32771UL, 33791UL, 34819UL, 35839UL, 36871UL, 37889UL, 38917UL, 39937UL, 40961UL, 41983UL, 43013UL, 44041UL, 45061UL, 46091UL, 47111UL, 48131UL, 49157UL, 50177UL, 51199UL, 52223UL, 53267UL, 54277UL, 55313UL, 56333UL, 57347UL, 58367UL, 59393UL, 60427UL, 61441UL, 62467UL, 63487UL, 64513UL, 65537UL, 67589UL, 69653UL, 71693UL, 73727UL, 75781UL, 77839UL, 79873UL, 81919UL, 83969UL, 86017UL, 88069UL, 90121UL, 92173UL, 94207UL, 96259UL, 98317UL, 100357UL, 102407UL, 104459UL, 106501UL, 108553UL, 110597UL, 112643UL, 114689UL, 116741UL, 118787UL, 120833UL, 122887UL, 124951UL, 126989UL, 129023UL, 131071UL, 135173UL, 139267UL, 143387UL, 147457UL, 151553UL, 155653UL, 159763UL, 163841UL, 167953UL, 172031UL, 176129UL, 180233UL, 184321UL, 188417UL, 192529UL, 196613UL, 200713UL, 204803UL, 208907UL, 212999UL, 217111UL, 221197UL, 225287UL, 229393UL, 233477UL, 237571UL, 241663UL, 245759UL, 249857UL, 253951UL, 258061UL, 262147UL, 270337UL, 278543UL, 286721UL, 294911UL, 303119UL, 311299UL, 319489UL, 327689UL, 335879UL, 344083UL, 352267UL, 360457UL, 368647UL, 376837UL, 385027UL, 393241UL, 401407UL, 409609UL, 417793UL, 425987UL, 434179UL, 442367UL, 450563UL, 458789UL, 466951UL, 475141UL, 483337UL, 491527UL, 499711UL, 507907UL, 516127UL, 524287UL, 540677UL, 557057UL, 573451UL, 589829UL, 606223UL, 622603UL, 638977UL, 655373UL, 671743UL, 688133UL, 704521UL, 720899UL, 737279UL, 753677UL, 770047UL, 786431UL, 802829UL, 819229UL, 835591UL, 851971UL, 868369UL, 884743UL, 901133UL, 917503UL, 933893UL, 950281UL, 966659UL, 983063UL, 999431UL, 1015813UL, 1032191UL, 1048583UL, 1081351UL, 1114111UL, 1146881UL, 1179649UL, 1212427UL, 1245187UL, 1277957UL, 1310719UL, 1343491UL, 1376257UL, 1409027UL, 1441807UL, 1474559UL, 1507369UL, 1540109UL, 1572869UL, 1605631UL, 1638431UL, 1671191UL, 1703941UL, 1736711UL, 1769473UL, 1802239UL, 1835017UL, 1867783UL, 1900543UL, 1933331UL, 1966079UL, 1998881UL, 2031671UL, 2064389UL, 2097169UL, 2162717UL, 2228243UL, 2293771UL, 2359303UL, 2424833UL, 2490377UL, 2555911UL, 2621447UL, 2686979UL, 2752513UL, 2818103UL, 2883593UL, 2949119UL, 3014659UL, 3080237UL, 3145739UL, 3211279UL, 3276799UL, 3342341UL, 3407881UL, 3473419UL, 3538949UL, 3604481UL, 3670027UL, 3735553UL, 3801097UL, 3866623UL, 3932167UL, 3997723UL, 4063237UL, 4128767UL, 4194319UL, 4325389UL, 4456451UL, 4587533UL, 4718617UL, 4849687UL, 4980749UL, 5111833UL, 5242883UL, 5373971UL, 5505023UL, 5636123UL, 5767169UL, 5898253UL, 6029329UL, 6160391UL, 6291469UL, 6422531UL, 6553621UL, 6684673UL, 6815749UL, 6946817UL, 7077893UL, 7208977UL, 7340033UL, 7471127UL, 7602187UL, 7733251UL, 7864331UL, 7995391UL, 8126473UL, 8257537UL, 8388617UL, 8650753UL, 8912921UL, 9175057UL, 9437189UL, 9699331UL, 9961487UL, 10223617UL, 10485767UL, 10747903UL, 11010059UL, 11272193UL, 11534351UL, 11796503UL, 12058679UL, 12320773UL, 12582917UL, 12845069UL, 13107229UL, 13369399UL, 13631489UL, 13893637UL, 14155777UL, 14417927UL, 14680063UL, 14942209UL, 15204391UL, 15466499UL, 15728681UL, 15990791UL, 16252967UL, 16515073UL, 16777259UL, 17301517UL, 17825791UL, 18350093UL, 18874367UL, 19398727UL, 19922993UL, 20447239UL, 20971529UL, 21495809UL, 22020127UL, 22544387UL, 23068673UL, 23592967UL, 24117257UL, 24641543UL, 25165843UL, 25690121UL, 26214401UL, 26738687UL, 27262997UL, 27787267UL, 28311553UL, 28835857UL, 29360147UL, 29884417UL, 30408713UL, 30933011UL, 31457287UL, 31981567UL, 32505901UL, 33030163UL, 33554467UL, 34603013UL, 35651593UL, 36700159UL, 37748743UL, 38797379UL, 39845887UL, 40894481UL, 41943049UL, 42991621UL, 44040253UL, 45088781UL, 46137359UL, 47185967UL, 48234517UL, 49283083UL, 50331653UL, 51380233UL, 52428841UL, 53477453UL, 54525979UL, 55574567UL, 56623153UL, 57671683UL, 58720267UL, 59768831UL, 60817411UL, 61865989UL, 62914619UL, 63963149UL, 65011717UL, 66060311UL, 67108879UL, 69206017UL, 71303171UL, 73400329UL, 75497479UL, 77594641UL, 79691779UL, 81788929UL, 83886091UL, 85983239UL, 88080389UL, 90177541UL, 92274737UL, 94371863UL, 96469001UL, 98566147UL, 100663319UL, 102760453UL, 104857601UL, 106954759UL, 109051903UL, 111149057UL, 113246209UL, 115343383UL, 117440551UL, 119537689UL, 121634819UL, 123731977UL, 125829139UL, 127926307UL, 130023431UL, 132120577UL, 134217757UL, 138412031UL, 142606357UL, 146800649UL, 150994979UL, 155189249UL, 159383563UL, 163577857UL, 167772161UL, 171966481UL, 176160779UL, 180355079UL, 184549429UL, 188743679UL, 192937991UL, 197132293UL, 201326611UL, 205520911UL, 209715199UL, 213909503UL, 218103811UL, 222298127UL, 226492433UL, 230686721UL, 234881033UL, 239075327UL, 243269639UL, 247463939UL, 251658263UL, 255852593UL, 260046847UL, 264241223UL, 268435459UL, 276824071UL, 285212677UL, 293601283UL, 301989917UL, 310378501UL, 318767107UL, 327155743UL, 335544323UL, 343932959UL, 352321547UL, 360710167UL, 369098771UL, 377487361UL, 385876021UL, 394264613UL, 402653189UL, 411041831UL, 419430419UL, 427819031UL, 436207619UL, 444596227UL, 452984849UL, 461373449UL, 469762049UL, 478150661UL, 486539323UL, 494927929UL, 503316511UL, 511705091UL, 520093703UL, 528482347UL, 536870923UL, 553648171UL, 570425377UL, 587202571UL, 603979799UL, 620757019UL, 637534277UL, 654311423UL, 671088667UL, 687865859UL, 704643083UL, 721420307UL, 738197503UL, 754974721UL, 771751961UL, 788529191UL, 805306457UL, 822083597UL, 838860817UL, 855638023UL, 872415239UL, 889192471UL, 905969671UL, 922746883UL, 939524129UL, 956301317UL, 973078537UL, 989855747UL, 1006632983UL, 1023410207UL, 1040187403UL, 1056964619UL, 1073741827UL, 1107296257UL, 1140850699UL, 1174405129UL, 1207959559UL, 1241514007UL, 1275068423UL, 1308622877UL, 1342177283UL, 1375731737UL, 1409286161UL, 1442840579UL, 1476395029UL, 1509949451UL, 1543503881UL, 1577058331UL, 1610612741UL, 1644167233UL, 1677721631UL, 1711276033UL, 1744830469UL, 1778384921UL, 1811939329UL, 1845493777UL, 1879048201UL, 1912602623UL, 1946157079UL, 1979711497UL, 2013265921UL, 2046820351UL, 2080374797UL, 2113929217UL, 2147483647UL, 2214592529UL, 2281701377UL, 2348810279UL, 2415919109UL, 2483027969UL, 2550136861UL, 2617245707UL, 2684354591UL, 2751463433UL, 2818572287UL, 2885681153UL, 2952790033UL, 3019898923UL, 3087007751UL, 3154116619UL, 3221225473UL, 3288334369UL, 3355443229UL, 3422552069UL, 3489660929UL, 3556769813UL, 3623878669UL, 3690987527UL, 3758096383UL, 3825205247UL, 3892314113UL, 3959422979UL, 4026531853UL, 4093640729UL, 4160749601UL, 4227858463UL }; int shift=16; unsigned long cmp=0x1fffff; unsigned long x=num; unsigned int y=0; if(x<32) { static const unsigned long lowprimes[32]={ 1,1,2,3, 5,5,7,7, 11,11,11,11, 13,13,17,17, 17,17,19,19, 23,23,23,23, 29,29,29,29, 29,29,31,31 }; return lowprimes[x]; } while(shift) { if(x>cmp) { y+=shift; x>>=shift; } shift>>=1; cmp>>=shift; } /* For really large numbers, produce a number which is not * a prime, but hopefully good for hash tables, although I * seriously doubt anybody will use hashtables larger than * 1<<32 entries... /Hubbe */ y = (y<<5)|(x&31); if(y >= NELEM(primes)) return num|7; return primes[y]; }

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