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49 lines
2 KiB
C
49 lines
2 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1996-2011 AT&T Intellectual Property *
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* Copyright (c) 2020-2021 Contributors to ksh 93u+m *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* *
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***********************************************************************/
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#pragma prototyped
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/*
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* bsd
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*/
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#define bsd_description \
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"The BSD checksum."
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#define bsd_options 0
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#define bsd_match "bsd|ucb"
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#define bsd_open long_open
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#define bsd_init long_init
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#define bsd_done short_done
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#define bsd_print long_print
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#define bsd_data long_data
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#define bsd_scale 1024
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static int
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bsd_block(register Sum_t* p, const void* s, size_t n)
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{
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register uint32_t c = ((Integral_t*)p)->sum;
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register unsigned char* b = (unsigned char*)s;
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register unsigned char* e = b + n;
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while (b < e)
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c = ((c >> 1) + *b++ + ((c & 01) ? 0x8000 : 0)) & 0xffff;
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((Integral_t*)p)->sum = c;
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return 0;
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}
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