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30 .\" @(#)bitstring.3 8.1 (Berkeley) 7/19/93
46 .Nd bit-string manipulation macros
50 .Fn bit_alloc "int nbits"
52 .Fn bit_decl "bitstr_t *name" "int nbits"
54 .Fn bit_clear "bitstr_t *name" "int bit"
56 .Fn bit_ffc "bitstr_t *name" "int nbits" "int *value"
58 .Fn bit_ffs "bitstr_t *name" "int nbits" "int *value"
60 .Fn bit_nclear "bitstr_t *name" "int start" "int stop"
62 .Fn bit_nset "bitstr_t *name" "int start" "int stop"
64 .Fn bit_set "bitstr_t *name" "int bit"
66 .Fn bitstr_size "int nbits"
68 .Fn bit_test "bitstr_t *name" "int bit"
70 These macros operate on strings of bits.
74 returns a pointer of type
76 to sufficient space to store
80 if no space is available.
84 allocates sufficient space to store
90 returns the number of elements of type
95 This is useful for copying bit strings.
101 clear or set the zero-based numbered bit
111 set or clear the zero-based numbered bits from
121 evaluates to non-zero if the zero-based numbered bit
125 is set, and zero otherwise.
130 stores in the location referenced by
132 the zero-based number of the first bit set in the array of
136 If no bits are set, the location referenced by
142 stores in the location referenced by
144 the zero-based number of the first bit not set in the array of
148 If all bits are set, the location referenced by
152 The arguments to these macros are evaluated only once and may safely
155 .Bd -literal -offset indent
157 #include <bsd/bitstring.h>
160 #define LPR_BUSY_BIT 0
161 #define LPR_FORMAT_BIT 1
162 #define LPR_DOWNLOAD_BIT 2
164 #define LPR_AVAILABLE_BIT 9
165 #define LPR_MAX_BITS 10
169 bitstr_t bit_decl(bitlist, LPR_MAX_BITS);
171 bit_nclear(bitlist, 0, LPR_MAX_BITS - 1);
173 if (!bit_test(bitlist, LPR_BUSY_BIT)) {
174 bit_clear(bitlist, LPR_FORMAT_BIT);
175 bit_clear(bitlist, LPR_DOWNLOAD_BIT);
176 bit_set(bitlist, LPR_AVAILABLE_BIT);
185 functions first appeared in