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BITARRAY.C
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C/C++ Source or Header
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1996-11-24
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848b
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35 lines
/* +++Date last modified: 02-Nov-1995 */
/*
** Functions to maintain an arbitrary length array of bits
*/
#include "bitops.h"
char *alloc_bit_array(size_t bits)
{
char *set = calloc((bits + CHAR_BIT - 1) / CHAR_BIT, sizeof(char));
return set;
}
int getbit(char *set, int number)
{
set += number / CHAR_BIT;
return (*set & (1 << (number % CHAR_BIT))) != 0; /* 0 or 1 */
}
void setbit(char *set, int number, int value)
{
set += number / CHAR_BIT;
if (value)
*set |= 1 << (number % CHAR_BIT); /* set bit */
else *set &= ~(1 << (number % CHAR_BIT)); /* clear bit*/
}
void flipbit(char *set, int number)
{
set += number / CHAR_BIT;
*set ^= 1 << (number % CHAR_BIT); /* flip bit */
}