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BITSTRING(3) UNIX Programmer's Manual BITSTRING(3)
NNAAMMEE
bbiitt__aalllloocc, bbiitt__cclleeaarr, bbiitt__ddeeccll, bbiitt__ffffss, bbiitt__nncclleeaarr, bbiitt__nnsseett,, bbiitt__sseett,
bbiittssttrr__ssiizzee, bbiitt__tteesstt - bit-string manipulation macros
SSYYNNOOPPSSIISS
##iinncclluuddee <<bbiittssttrriinngg..hh>>
_b_i_t_s_t_r___t _*
bbiitt__aalllloocc(_i_n_t _n_b_i_t_s)
bbiitt__ddeeccll(_b_i_t___s_t_r _n_a_m_e, _i_n_t _n_b_i_t_s)
bbiitt__cclleeaarr(_b_i_t___s_t_r _n_a_m_e, _i_n_t _b_i_t)
bbiitt__ffffcc(_b_i_t___s_t_r _n_a_m_e, _i_n_t _n_b_i_t_s, _i_n_t _*_v_a_l_u_e)
bbiitt__ffffss(_b_i_t___s_t_r _n_a_m_e, _i_n_t _n_b_i_t_s, _i_n_t _*_v_a_l_u_e)
bbiitt__nncclleeaarr(_b_i_t___s_t_r _n_a_m_e, _i_n_t _s_t_a_r_t, _i_n_t _s_t_o_p)
bbiitt__nnsseett(_b_i_t___s_t_r _n_a_m_e, _i_n_t _s_t_a_r_t, _i_n_t _s_t_o_p)
bbiitt__sseett(_b_i_t___s_t_r _n_a_m_e, _i_n_t _b_i_t)
bbiittssttrr__ssiizzee(_i_n_t _n_b_i_t_s)
bbiitt__tteesstt(_b_i_t___s_t_r _n_a_m_e, _i_n_t _b_i_t)
DDEESSCCRRIIPPTTIIOONN
These macros operate on strings of bits.
The macro bbiitt__aalllloocc() returns a pointer of type ``_b_i_t_s_t_r___t _*'' to suffi-
cient space to store _n_b_i_t_s bits, or NULL if no space is available.
The macro bbiitt__ddeeccll() allocates sufficient space to store _n_b_i_t_s bits on
the stack.
The macro bbiittssttrr__ssiizzee() returns the number of elements of type _b_i_t_s_t_r___t
necessary to store _n_b_i_t_s bits. This is useful for copying bit strings.
The macros bbiitt__cclleeaarr() and bbiitt__sseett() clear or set the zero-based numbered
bit _b_i_t, in the bit string _n_a_m_e.
The bbiitt__nnsseett() and bbiitt__nncclleeaarr() macros set or clear the zero-based num-
bered bits from _s_t_a_r_t to _s_t_o_p in the bit string _n_a_m_e.
The bbiitt__tteesstt() macro evaluates to non-zero if the zero-based numbered bit
_b_i_t of bit string _n_a_m_e is set, and zero otherwise.
The bbiitt__ffffss() macro stores in the location referenced by _v_a_l_u_e the zero-
based number of the first bit set in the array of _n_b_i_t_s bits referenced
by _n_a_m_e. If no bits are set, the location referenced by _v_a_l_u_e is set to
-1.
The macro bbiitt__ffffcc() stores in the location referenced by _v_a_l_u_e the zero-
based number of the first bit not set in the array of _n_b_i_t_s bits refer-
enced by _n_a_m_e. If all bits are set, the location referenced by _v_a_l_u_e is
set to -1.
The arguments to these macros are evaluated only once and may safely have
side effects.
EEXXAAMMPPLLEE
#include <limits.h>
#include <bitstring.h>
#define LPR_BUSY_BIT 0
#define LPR_FORMAT_BIT 1
#define LPR_DOWNLOAD_BIT 2
#define LPR_AVAILABLE_BIT 9
#define LPR_MAX_BITS 10
make_lpr_available()
{
bitstr_t bit_decl(bitlist, LPR_MAX_BITS);
...
bit_nclear(bitlist, 0, LPR_MAX_BITS - 1);
...
if (!bit_test(bitlist, LPR_BUSY_BIT)) {
bit_clear(bitlist, LPR_FORMAT_BIT);
bit_clear(bitlist, LPR_DOWNLOAD_BIT);
bit_set(bitlist, LPR_AVAILABLE_BIT);
}
}
SSEEEE AALLSSOO
malloc(3)
HHIISSTTOORRYY
The bbiittssttrriinngg functions first appeared in 4.4BSD.
4th Berkeley Distribution July 19, 1993 2