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hash.m4 revision 1.3 
      1 #
      2 # Copyright (c) 1989, 1993
      3 #	The Regents of the University of California.  All rights reserved.
      4 #
      5 # This code is derived from software contributed to Berkeley by
      6 # Ozan Yigit.
      7 #
      8 # Redistribution and use in source and binary forms, with or without
      9 # modification, are permitted provided that the following conditions
     10 # are met:
     11 # 1. Redistributions of source code must retain the above copyright
     12 #    notice, this list of conditions and the following disclaimer.
     13 # 2. Redistributions in binary form must reproduce the above copyright
     14 #    notice, this list of conditions and the following disclaimer in the
     15 #    documentation and/or other materials provided with the distribution.
     16 # 3. All advertising materials mentioning features or use of this software
     17 #    must display the following acknowledgement:
     18 #	This product includes software developed by the University of
     19 #	California, Berkeley and its contributors.
     20 # 4. Neither the name of the University nor the names of its contributors
     21 #    may be used to endorse or promote products derived from this software
     22 #    without specific prior written permission.
     23 #
     24 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27 # ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34 # SUCH DAMAGE.
     35 #
     36 #	@(#)hash.m4	8.1 (Berkeley) 6/6/93
     37 #
     38 
     39 dnl	This probably will not run on any m4 that cannot
     40 dnl	handle char constants in eval.
     41 dnl
     42 changequote(<,>) define(HASHVAL,99) dnl
     43 define(hash,<eval(str(substr($1,1),0)%HASHVAL)>) dnl
     44 define(str,
     45 	<ifelse($1,",$2,
     46 		<str(substr(<$1>,1),<eval($2+'substr($1,0,1)')>)>)
     47 	>) dnl
     48 define(KEYWORD,<$1,hash($1),>) dnl
     49 define(TSTART,
     50 <struct prehash {
     51 	char *keyword;
     52 	int   hashval;
     53 } keytab[] = {>) dnl
     54 define(TEND,<	"",0
     55 };>) dnl
     56