1/* ccl - routines for character classes */
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
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.
13 *
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.
27 */
28
29/* $Header: /home/daffy/u0/vern/flex/RCS/ccl.c,v 2.9 93/09/16 20:32:14 vern Exp $ */
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include "flexdef.h"
34
35/* ccladd - add a single character to a ccl */
36
37void ccladd( cclp, ch )
38int cclp;
39int ch;
40	{
41	int ind, len, newpos, i;
42
43	check_char( ch );
44
45	len = ccllen[cclp];
46	ind = cclmap[cclp];
47
48	/* check to see if the character is already in the ccl */
49
50	for ( i = 0; i < len; ++i )
51		if ( ccltbl[ind + i] == ch )
52			return;
53
54	newpos = ind + len;
55
56	if ( newpos >= current_max_ccl_tbl_size )
57		{
58		current_max_ccl_tbl_size += MAX_CCL_TBL_SIZE_INCREMENT;
59
60		++num_reallocs;
61
62		ccltbl = reallocate_Character_array( ccltbl,
63						current_max_ccl_tbl_size );
64		}
65
66	ccllen[cclp] = len + 1;
67	ccltbl[newpos] = ch;
68	}
69
70
71/* cclinit - return an empty ccl */
72
73int cclinit()
74	{
75	if ( ++lastccl >= current_maxccls )
76		{
77		current_maxccls += MAX_CCLS_INCREMENT;
78
79		++num_reallocs;
80
81		cclmap = reallocate_integer_array( cclmap, current_maxccls );
82		ccllen = reallocate_integer_array( ccllen, current_maxccls );
83		cclng = reallocate_integer_array( cclng, current_maxccls );
84		}
85
86	if ( lastccl == 1 )
87		/* we're making the first ccl */
88		cclmap[lastccl] = 0;
89
90	else
91		/* The new pointer is just past the end of the last ccl.
92		 * Since the cclmap points to the \first/ character of a
93		 * ccl, adding the length of the ccl to the cclmap pointer
94		 * will produce a cursor to the first free space.
95		 */
96		cclmap[lastccl] = cclmap[lastccl - 1] + ccllen[lastccl - 1];
97
98	ccllen[lastccl] = 0;
99	cclng[lastccl] = 0;	/* ccl's start out life un-negated */
100
101	return lastccl;
102	}
103
104
105/* cclnegate - negate the given ccl */
106
107void cclnegate( cclp )
108int cclp;
109	{
110	cclng[cclp] = 1;
111	}
112
113
114/* list_character_set - list the members of a set of characters in CCL form
115 *
116 * Writes to the given file a character-class representation of those
117 * characters present in the given CCL.  A character is present if it
118 * has a non-zero value in the cset array.
119 */
120
121void list_character_set( file, cset )
122FILE *file;
123int cset[];
124	{
125	int i;
126
127	putc( '[', file );
128
129	for ( i = 0; i < csize; ++i )
130		{
131		if ( cset[i] )
132			{
133			int start_char = i;
134
135			putc( ' ', file );
136
137			fputs( readable_form( i ), file );
138
139			while ( ++i < csize && cset[i] )
140				;
141
142			if ( i - 1 > start_char )
143				/* this was a run */
144				fprintf( file, "-%s", readable_form( i - 1 ) );
145
146			putc( ' ', file );
147			}
148		}
149
150	putc( ']', file );
151	}
152