| [117] | 1 | /* +++Date last modified: 05-Jul-1997 */ |
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| 2 | |
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| 3 | /* |
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| 4 | ** Macros and prototypes for bit operations |
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| 5 | ** |
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| 6 | ** public domain for SNIPPETS by: |
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| 7 | ** Scott Dudley |
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| 8 | ** Auke Reitsma |
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| 9 | ** Ratko Tomic |
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| 10 | ** Aare Tali |
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| 11 | ** J. Blauth |
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| 12 | ** Bruce Wedding |
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| 13 | ** Bob Stout |
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| 14 | */ |
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| 15 | |
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| 16 | #ifndef BITOPS__H |
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| 17 | #define BITOPS__H |
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| 18 | |
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| 19 | #include <stdio.h> |
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| 20 | #include <stdlib.h> /* For size_t */ |
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| 21 | #include <limits.h> /* For CHAR_BIT */ |
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| 22 | #include "bitcount-sniptype.h" /* For TOBOOL() */ |
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| 23 | #include "bitcount-extkword.h" /* For CDECL */ |
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| 24 | |
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| 25 | /* |
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| 26 | ** Macros to manipulate bits in any integral data type. |
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| 27 | */ |
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| 28 | |
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| 29 | #define BitSet(arg,posn) ((arg) | (1L << (posn))) |
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| 30 | #define BitClr(arg,posn) ((arg) & ~(1L << (posn))) |
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| 31 | #define BitFlp(arg,posn) ((arg) ^ (1L << (posn))) |
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| 32 | #define BitTst(arg,posn) TOBOOL((arg) & (1L << (posn))) |
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| 33 | |
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| 34 | /* |
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| 35 | ** Macros to manipulate bits in an array of char. |
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| 36 | ** These macros assume CHAR_BIT is one of either 8, 16, or 32. |
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| 37 | */ |
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| 38 | |
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| 39 | #define MASK CHAR_BIT-1 |
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| 40 | #define SHIFT ((CHAR_BIT==8)?3:(CHAR_BIT==16)?4:8) |
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| 41 | |
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| 42 | #define BitOff(a,x) ((void)((a)[(x)>>SHIFT] &= ~(1 << ((x)&MASK)))) |
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| 43 | #define BitOn(a,x) ((void)((a)[(x)>>SHIFT] |= (1 << ((x)&MASK)))) |
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| 44 | #define BitFlip(a,x) ((void)((a)[(x)>>SHIFT] ^= (1 << ((x)&MASK)))) |
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| 45 | #define IsBit(a,x) ((a)[(x)>>SHIFT] & (1 << ((x)&MASK))) |
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| 46 | |
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| 47 | /* |
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| 48 | ** BITARRAY.C |
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| 49 | */ |
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| 50 | |
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| 51 | char *alloc_bit_array(size_t bits); |
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| 52 | int getbit(char *set, int number); |
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| 53 | void setbit(char *set, int number, int value); |
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| 54 | void flipbit(char *set, int number); |
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| 55 | |
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| 56 | /* |
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| 57 | ** BITFILES.C |
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| 58 | */ |
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| 59 | |
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| 60 | typedef struct { |
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| 61 | FILE * file; /* for stream I/O */ |
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| 62 | char rbuf; /* read bit buffer */ |
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| 63 | char rcnt; /* read bit count */ |
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| 64 | char wbuf; /* write bit buffer */ |
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| 65 | char wcnt; /* write bit count */ |
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| 66 | } bfile; |
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| 67 | |
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| 68 | bfile * bfopen(char *name, char *mode); |
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| 69 | int bfread(bfile *bf); |
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| 70 | void bfwrite(int bit, bfile *bf); |
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| 71 | void bfclose(bfile *bf); |
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| 72 | |
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| 73 | /* |
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| 74 | ** BITSTRNG.C |
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| 75 | */ |
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| 76 | |
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| 77 | void bitstring(char *str, long byze, int biz, int strwid); |
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| 78 | |
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| 79 | /* |
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| 80 | ** BSTR_I.C |
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| 81 | */ |
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| 82 | |
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| 83 | unsigned int bstr_i(char *cptr); |
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| 84 | |
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| 85 | /* |
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| 86 | ** BITCNT_1.C |
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| 87 | */ |
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| 88 | |
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| 89 | int CDECL bit_count(long x); |
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| 90 | |
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| 91 | /* |
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| 92 | ** BITCNT_2.C |
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| 93 | */ |
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| 94 | |
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| 95 | int CDECL bitcount(long i); |
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| 96 | |
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| 97 | /* |
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| 98 | ** BITCNT_3.C |
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| 99 | */ |
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| 100 | |
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| 101 | int CDECL ntbl_bitcount(long int x); |
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| 102 | int CDECL BW_btbl_bitcount(long int x); |
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| 103 | int CDECL AR_btbl_bitcount(long int x); |
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| 104 | |
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| 105 | /* |
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| 106 | ** BITCNT_4.C |
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| 107 | */ |
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| 108 | |
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| 109 | int CDECL ntbl_bitcnt(long x); |
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| 110 | int CDECL btbl_bitcnt(long x); |
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| 111 | |
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| 112 | #endif /* BITOPS__H */ |
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