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106 lines
1.7 KiB
C
106 lines
1.7 KiB
C
/**
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r_bitfield.c
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Copyright (C) 2001 RTFM, Inc.
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All Rights Reserved.
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ekr@rtfm.com Wed Oct 3 11:15:23 2001
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*/
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#include <r_common.h>
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#include "r_bitfield.h"
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int
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r_bitfield_create (r_bitfield **setp, UINT4 size)
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{
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r_bitfield *set=0;
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int _status;
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int num_words=size/32+!!(size%32);
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if(!(set=(r_bitfield *)RMALLOC(sizeof(r_bitfield))))
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ABORT(R_NO_MEMORY);
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if(!(set->data=(UINT4 *)RMALLOC(num_words*4)))
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ABORT(R_NO_MEMORY);
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memset(set->data,0,4*num_words);
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set->base=0;
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set->len=num_words;
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*setp=set;
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_status=0;
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abort:
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if(_status){
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r_bitfield_destroy(&set);
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}
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return(_status);
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}
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int
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r_bitfield_destroy (r_bitfield **setp)
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{
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r_bitfield *set;
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if(!setp || !*setp)
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return(0);
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set=*setp;
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RFREE(set->data);
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RFREE(set);
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*setp=0;
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return(0);
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}
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int
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r_bitfield_set (r_bitfield *set, int bit)
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{
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int word=(bit-set->base)/32;
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int bbit=(bit-set->base)%32;
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int _status;
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/* Resize? */
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if(word>set->len){
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UINT4 newlen=set->len;
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UINT4 *tmp;
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while(newlen<word)
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newlen*=2;
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if(!(tmp=(UINT4 *)RMALLOC(newlen)))
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ABORT(R_NO_MEMORY);
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memcpy(tmp,set->data,set->len*4);
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memset(tmp+set->len*4,0,(newlen-set->len)*4);
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RFREE(set->data);
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set->data=tmp;
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}
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set->data[word]|=1<<bbit;
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_status=0;
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abort:
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return(_status);
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}
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int
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r_bitfield_isset (r_bitfield *set, int bit)
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{
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int word=(bit-set->base)/32;
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int bbit=(bit-set->base)%32;
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int _status;
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if(bit<set->base)
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return(0);
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/* Resize? */
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if(word>set->len)
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return(0);
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return(set->data[word]&(1<<bbit));
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}
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