175 lines
3.9 KiB
C
175 lines
3.9 KiB
C
/* ccl - routines for character classes */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Vern Paxson.
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*
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* The United States Government has rights in this work pursuant
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* to contract no. DE-AC03-76SF00098 between the United States
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* Department of Energy and the University of California.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char rcsid[] =
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"@(#) $Header$ (LBL)";
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#endif
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#include "flexdef.h"
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/* ccladd - add a single character to a ccl
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*
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* synopsis
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* int cclp;
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* int ch;
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* ccladd( cclp, ch );
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*/
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void ccladd( cclp, ch )
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int cclp;
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int ch;
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{
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int ind, len, newpos, i;
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len = ccllen[cclp];
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ind = cclmap[cclp];
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/* check to see if the character is already in the ccl */
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for ( i = 0; i < len; ++i )
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if ( ccltbl[ind + i] == ch )
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return;
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newpos = ind + len;
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if ( newpos >= current_max_ccl_tbl_size )
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{
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current_max_ccl_tbl_size += MAX_CCL_TBL_SIZE_INCREMENT;
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++num_reallocs;
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ccltbl = reallocate_character_array( ccltbl, current_max_ccl_tbl_size );
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}
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ccllen[cclp] = len + 1;
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ccltbl[newpos] = ch;
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}
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/* cclinit - make an empty ccl
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*
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* synopsis
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* int cclinit();
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* new_ccl = cclinit();
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*/
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int cclinit()
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{
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if ( ++lastccl >= current_maxccls )
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{
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current_maxccls += MAX_CCLS_INCREMENT;
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++num_reallocs;
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cclmap = reallocate_integer_array( cclmap, current_maxccls );
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ccllen = reallocate_integer_array( ccllen, current_maxccls );
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cclng = reallocate_integer_array( cclng, current_maxccls );
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}
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if ( lastccl == 1 )
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/* we're making the first ccl */
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cclmap[lastccl] = 0;
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else
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/* the new pointer is just past the end of the last ccl. Since
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* the cclmap points to the \first/ character of a ccl, adding the
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* length of the ccl to the cclmap pointer will produce a cursor
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* to the first free space
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*/
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cclmap[lastccl] = cclmap[lastccl - 1] + ccllen[lastccl - 1];
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ccllen[lastccl] = 0;
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cclng[lastccl] = 0; /* ccl's start out life un-negated */
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return ( lastccl );
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}
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/* cclnegate - negate a ccl
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*
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* synopsis
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* int cclp;
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* cclnegate( ccl );
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*/
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void cclnegate( cclp )
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int cclp;
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{
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cclng[cclp] = 1;
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}
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/* list_character_set - list the members of a set of characters in CCL form
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*
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* synopsis
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* int cset[CSIZE];
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* FILE *file;
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* list_character_set( cset );
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*
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* writes to the given file a character-class representation of those
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* characters present in the given set. A character is present if it
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* has a non-zero value in the set array.
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*/
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void list_character_set( file, cset )
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FILE *file;
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int cset[];
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{
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register int i;
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char *readable_form();
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putc( '[', file );
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for ( i = 0; i < csize; ++i )
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{
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if ( cset[i] )
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{
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register int start_char = i;
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putc( ' ', file );
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fputs( readable_form( i ), file );
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while ( ++i < csize && cset[i] )
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;
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if ( i - 1 > start_char )
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/* this was a run */
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fprintf( file, "-%s", readable_form( i - 1 ) );
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putc( ' ', file );
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}
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}
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putc( ']', file );
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}
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