modules/ma/bitmask.c
/* [<][>][^][v][top][bottom][index][help] */
FUNCTIONS
This source file includes following functions.
- MA_free
- MA_isset
- MA_set
- MA_clear
- MA_new
- MA_prt
- MA_and
- MA_xor
- MA_or
- MA_not
- MA_bitcount
- MA_to_string
- main
/***************************************
$Revision: 1.9 $
bitmask (ma) - bitmask.c - library for manipulating fixed size bitmasks.
Status: NOT REVUED, TESTED, INCOMPLETE
Design and implementation by: Marek Bukowy, Chris Ottrey.
******************/ /******************
Copyright (c) 1999 RIPE NCC
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of the author not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
***************************************/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "bitmask.h"
#include "memwrap.h"
#include "globaldefs.h"
void MA_free(mask_t *m) {
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wr_free(m);
} /* MA_free() */
int MA_isset(mask_t d, int b) {
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return(
(d.data[b / MASK_BITS_BASESIZE] &(1 <<(b % MASK_BITS_BASESIZE)))
> 0);
}
void MA_set(mask_t *m_ptr, unsigned b, int v) {
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assert(b < MASK_MAX);
assert(v == 0 || v == 1);
if(v == 1)
m_ptr->data[b / MASK_BITS_BASESIZE] |=(1 <<(b % MASK_BITS_BASESIZE));
else
m_ptr->data[b / MASK_BITS_BASESIZE] &= ~(1 <<(b % MASK_BITS_BASESIZE));
}
void MA_clear(mask_t *m_ptr) {
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memset(m_ptr, 0, sizeof(mask_t));
} /* MA_clear() */
/* set bits in dptr. variable number of args, terminated by MA_END */
mask_t MA_new(int n,...) {
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va_list ap;
mask_t d;
MA_clear(&d);
/* cover the "empty mask" case => MA_new(MA_END) invoked */
for ( va_start(ap, n); n != MA_END; n = va_arg(ap, int) ) {
MA_set(&d, n, 1);
}
va_end(ap);
return d;
}
void MA_prt(mask_t m) {
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int i;
for (i = 0; i < MASK_MAX; i++) {
printf("%d", MA_isset(m, i));
}
printf("\n");
for (i = 0; i < MASK_BITS_WORDS; i++) {
printf("0x%0*X ", 2 * sizeof(MASK_BITS_BASETYPE), m.data[i]);
}
printf("\n");
}
/* Perform a logical AND on two masks.
Author: ottrey
Date: Tue Jul 6 13:28:24 CEST 1999
NB: This operation could/should be done a word at a time?
*/
mask_t MA_and(mask_t a, mask_t b) {
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mask_t c;
int i;
for (i=0; i < MASK_BITS_WORDS; i++ ) {
c.data[i] = a.data[i] & b.data[i];
}
return c;
} /* MA_and() */
/* Perform a logical XOR on two masks.
Author: ottrey
Date: Thu Jul 8 14:50:14 CEST 1999
NB: This operation could/should be done a word at a time?
*/
mask_t MA_xor(mask_t a, mask_t b) {
/* [<][>][^][v][top][bottom][index][help] */
mask_t c;
int i;
for (i=0; i < MASK_BITS_WORDS; i++ ) {
c.data[i] = a.data[i] ^ b.data[i];
}
return c;
} /* MA_xor() */
/* Perform a logical OR on two masks.
Author: ottrey
Date: Thu Jul 8 16:34:34 CEST 1999
NB: This operation could/should be done a word at a time?
*/
mask_t MA_or(mask_t a, mask_t b) {
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mask_t c;
int i;
for (i=0; i < MASK_BITS_WORDS; i++ ) {
c.data[i] = a.data[i] | b.data[i];
}
return c;
} /* MA_or() */
/* Perform a logical NOT operation on a mask.
Author: marek
Date: Fri Jan 14 17:15:00 MET 2000
NB: This operation is done a word at a time.
*/
mask_t MA_not(mask_t a) {
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mask_t c;
int i;
for (i=0; i < MASK_BITS_WORDS; i++ ) {
c.data[i] = ~a.data[i];
}
}
/* Counts the number of bits set. */
int MA_bitcount(mask_t m) {
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int i;
int count=0;
for (i=0; i < MASK_MAX; i++) {
count += MA_isset(m, i);
}
return count;
} /* MA_bitcount() */
/* Convert the bitmap to a string comprising of tokens from an array of tokens.
Author: ottrey
Date: Tue Jul 6 13:28:24 CEST 1999
*/
char *MA_to_string(mask_t mask, char * const *tokens) {
/* [<][>][^][v][top][bottom][index][help] */
char *str;
char str_buf[STR_L];
int count;
int i;
int length;
strcpy(str_buf, "");
count=0;
sprintf(str_buf, "{");
for (i=0; tokens[i] != NULL; i++) {
if ( MA_isset(mask, i) != 0) {
strcat(str_buf, tokens[i]);
strcat(str_buf, ",");
count++;
}
}
if (count == 0) {
strcat(str_buf, "NULL ");
}
length = strlen(str_buf);
str_buf[length-1] = '}';
// str = (char *)calloc(1, strlen(str_buf)+1);
dieif(wr_calloc( (void **) &str, 1, strlen(str_buf)+1) != UT_OK);
strcpy(str, str_buf);
return str;
} /* MA_to_string() */
#ifdef MODULE_TEST
void
main() {
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mask_t d;
d = MA_new(1, 4, 56, 3, 5, 7, 19, MA_END);
MA_prt(d);
MA_set(&d, 3, 0);
MA_set(&d, 7, 0);
MA_set(&d, 9, 0);
MA_set(&d, 19, 0);
MA_prt(d);
}
#endif