clang: Suppress 'argument unused during compilation' warnings.
[dragonfly.git] / usr.bin / lex / sym.c
blob7b1996de48034f9a68e0c207063376d2a50026b8
1 /* sym - symbol table routines */
3 /*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Vern Paxson.
9 *
10 * The United States Government has rights in this work pursuant
11 * to contract no. DE-AC03-76SF00098 between the United States
12 * Department of Energy and the University of California.
14 * Redistribution and use in source and binary forms are permitted provided
15 * that: (1) source distributions retain this entire copyright notice and
16 * comment, and (2) distributions including binaries display the following
17 * acknowledgement: ``This product includes software developed by the
18 * University of California, Berkeley and its contributors'' in the
19 * documentation or other materials provided with the distribution and in
20 * all advertising materials mentioning features or use of this software.
21 * Neither the name of the University nor the names of its contributors may
22 * be used to endorse or promote products derived from this software without
23 * specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
29 /* $Header: /home/daffy/u0/vern/flex/RCS/sym.c,v 2.19 95/03/04 16:11:04 vern Exp $ */
30 /* $FreeBSD: src/usr.bin/lex/sym.c,v 1.5 1999/10/27 07:56:47 obrien Exp $ */
31 /* $DragonFly: src/usr.bin/lex/sym.c,v 1.4 2005/08/04 17:31:22 drhodus Exp $ */
33 #include "flexdef.h"
36 /* declare functions that have forward references */
38 int hashfunct PROTO((char[], int));
41 struct hash_entry *ndtbl[NAME_TABLE_HASH_SIZE];
42 struct hash_entry *sctbl[START_COND_HASH_SIZE];
43 struct hash_entry *ccltab[CCL_HASH_SIZE];
45 struct hash_entry *findsym();
48 /* addsym - add symbol and definitions to symbol table
50 * -1 is returned if the symbol already exists, and the change not made.
53 int addsym(char *sym, char *str_def, int int_def, hash_table table,
54 int table_size)
56 int hash_val = hashfunct( sym, table_size );
57 struct hash_entry *sym_entry = table[hash_val];
58 struct hash_entry *new_entry;
59 struct hash_entry *successor;
61 while ( sym_entry )
63 if ( ! strcmp( sym, sym_entry->name ) )
64 { /* entry already exists */
65 return -1;
68 sym_entry = sym_entry->next;
71 /* create new entry */
72 new_entry = (struct hash_entry *)
73 flex_alloc( sizeof( struct hash_entry ) );
75 if ( new_entry == NULL )
76 flexfatal( _( "symbol table memory allocation failed" ) );
78 if ( (successor = table[hash_val]) != 0 )
80 new_entry->next = successor;
81 successor->prev = new_entry;
83 else
84 new_entry->next = NULL;
86 new_entry->prev = NULL;
87 new_entry->name = sym;
88 new_entry->str_val = str_def;
89 new_entry->int_val = int_def;
91 table[hash_val] = new_entry;
93 return 0;
97 /* cclinstal - save the text of a character class */
99 void cclinstal(Char *ccltxt, int cclnum)
101 /* We don't bother checking the return status because we are not
102 * called unless the symbol is new.
104 Char *copy_unsigned_string();
106 (void) addsym( (char *) copy_unsigned_string( ccltxt ),
107 NULL, cclnum,
108 ccltab, CCL_HASH_SIZE );
112 /* ccllookup - lookup the number associated with character class text
114 * Returns 0 if there's no CCL associated with the text.
117 int ccllookup(Char *ccltxt)
119 return findsym( (char *) ccltxt, ccltab, CCL_HASH_SIZE )->int_val;
123 /* findsym - find symbol in symbol table */
125 struct hash_entry *findsym(char *sym, hash_table table, int table_size)
127 static struct hash_entry empty_entry =
129 NULL, NULL,
130 NULL, NULL, 0,
132 struct hash_entry *sym_entry =
133 table[hashfunct( sym, table_size )];
135 while ( sym_entry )
137 if ( ! strcmp( sym, sym_entry->name ) )
138 return sym_entry;
139 sym_entry = sym_entry->next;
142 return &empty_entry;
146 /* hashfunct - compute the hash value for "str" and hash size "hash_size" */
148 int hashfunct(char *str, int hash_size)
150 int hashval;
151 int locstr;
153 hashval = 0;
154 locstr = 0;
156 while ( str[locstr] )
158 hashval = (hashval << 1) + (unsigned char) str[locstr++];
159 hashval %= hash_size;
162 return hashval;
166 /* ndinstal - install a name definition */
168 void ndinstal(char *name, Char *definition)
170 char *copy_string();
171 Char *copy_unsigned_string();
173 if ( addsym( copy_string( name ),
174 (char *) copy_unsigned_string( definition ), 0,
175 ndtbl, NAME_TABLE_HASH_SIZE ) )
176 synerr( _( "name defined twice" ) );
180 /* ndlookup - lookup a name definition
182 * Returns a nil pointer if the name definition does not exist.
185 Char *ndlookup(char *nd)
187 return (Char *) findsym( nd, ndtbl, NAME_TABLE_HASH_SIZE )->str_val;
191 /* scextend - increase the maximum number of start conditions */
193 void scextend(void)
195 current_max_scs += MAX_SCS_INCREMENT;
197 ++num_reallocs;
199 scset = reallocate_integer_array( scset, current_max_scs );
200 scbol = reallocate_integer_array( scbol, current_max_scs );
201 scxclu = reallocate_integer_array( scxclu, current_max_scs );
202 sceof = reallocate_integer_array( sceof, current_max_scs );
203 scname = reallocate_char_ptr_array( scname, current_max_scs );
207 /* scinstal - make a start condition
209 * NOTE
210 * The start condition is "exclusive" if xcluflg is true.
213 void scinstal(char *str, int xcluflg)
215 char *copy_string();
217 /* Generate start condition definition, for use in BEGIN et al. */
218 action_define( str, lastsc );
220 if ( ++lastsc >= current_max_scs )
221 scextend();
223 scname[lastsc] = copy_string( str );
225 if ( addsym( scname[lastsc], NULL, lastsc,
226 sctbl, START_COND_HASH_SIZE ) )
227 format_pinpoint_message(
228 _( "start condition %s declared twice" ),
229 str );
231 scset[lastsc] = mkstate( SYM_EPSILON );
232 scbol[lastsc] = mkstate( SYM_EPSILON );
233 scxclu[lastsc] = xcluflg;
234 sceof[lastsc] = false;
238 /* sclookup - lookup the number associated with a start condition
240 * Returns 0 if no such start condition.
243 int sclookup(char *str)
245 return findsym( str, sctbl, START_COND_HASH_SIZE )->int_val;