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54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
/*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted.
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* chongo was here /\../\ http://reality.sgi.com/chongo/
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*/
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/*
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* halflen - determine the length of numeric value in HALFs
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*
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* This file is part of the custom sample calc files.
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*
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* NOTE: You must use a calc that was compiled with ALLOW_CUSTOM= -DCUSTOM
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* and run with a -C arg.
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*/
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define halflen(num)
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{
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local baseb = custom("sysinfo","BASEB"); /* bit len of a HALF */
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/*
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* firewall
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*/
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if (!isnum(num)) {
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return newerror("halflen only works on numeric values");
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}
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/*
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* determine the HALF length of a numeric value
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*/
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if (num == 0) {
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/* consider 0 to be 1 HALF long */
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return 1;
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} else if (isint(num)) {
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return (highbit(num)+baseb-1)/baseb;
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} else if (isreal(num)) {
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return halflen(num(num)) + halflen(den(num));
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} else if (isnum(num)) {
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return halflen(re(num)) + halflen(im(num));
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} else {
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return newerror("halflen only works on numeric values");
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}
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}
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if (config("lib_debug") >= 0) {
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print "halflen(num) defined";
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}
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