Annotation of src/usr.bin/lex/ccl.c, Revision 1.1
1.1 ! deraadt 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: /a/cvsroot/src/usr.bin/lex/ccl.c,v 1.6 1995/05/05 05:35:12 jtc Exp $ */
! 30:
! 31: #include "flexdef.h"
! 32:
! 33: /* ccladd - add a single character to a ccl */
! 34:
! 35: void ccladd( cclp, ch )
! 36: int cclp;
! 37: int ch;
! 38: {
! 39: int ind, len, newpos, i;
! 40:
! 41: check_char( ch );
! 42:
! 43: len = ccllen[cclp];
! 44: ind = cclmap[cclp];
! 45:
! 46: /* check to see if the character is already in the ccl */
! 47:
! 48: for ( i = 0; i < len; ++i )
! 49: if ( ccltbl[ind + i] == ch )
! 50: return;
! 51:
! 52: newpos = ind + len;
! 53:
! 54: if ( newpos >= current_max_ccl_tbl_size )
! 55: {
! 56: current_max_ccl_tbl_size += MAX_CCL_TBL_SIZE_INCREMENT;
! 57:
! 58: ++num_reallocs;
! 59:
! 60: ccltbl = reallocate_Character_array( ccltbl,
! 61: current_max_ccl_tbl_size );
! 62: }
! 63:
! 64: ccllen[cclp] = len + 1;
! 65: ccltbl[newpos] = ch;
! 66: }
! 67:
! 68:
! 69: /* cclinit - return an empty ccl */
! 70:
! 71: int cclinit()
! 72: {
! 73: if ( ++lastccl >= current_maxccls )
! 74: {
! 75: current_maxccls += MAX_CCLS_INCREMENT;
! 76:
! 77: ++num_reallocs;
! 78:
! 79: cclmap = reallocate_integer_array( cclmap, current_maxccls );
! 80: ccllen = reallocate_integer_array( ccllen, current_maxccls );
! 81: cclng = reallocate_integer_array( cclng, current_maxccls );
! 82: }
! 83:
! 84: if ( lastccl == 1 )
! 85: /* we're making the first ccl */
! 86: cclmap[lastccl] = 0;
! 87:
! 88: else
! 89: /* The new pointer is just past the end of the last ccl.
! 90: * Since the cclmap points to the \first/ character of a
! 91: * ccl, adding the length of the ccl to the cclmap pointer
! 92: * will produce a cursor to the first free space.
! 93: */
! 94: cclmap[lastccl] = cclmap[lastccl - 1] + ccllen[lastccl - 1];
! 95:
! 96: ccllen[lastccl] = 0;
! 97: cclng[lastccl] = 0; /* ccl's start out life un-negated */
! 98:
! 99: return lastccl;
! 100: }
! 101:
! 102:
! 103: /* cclnegate - negate the given ccl */
! 104:
! 105: void cclnegate( cclp )
! 106: int cclp;
! 107: {
! 108: cclng[cclp] = 1;
! 109: }
! 110:
! 111:
! 112: /* list_character_set - list the members of a set of characters in CCL form
! 113: *
! 114: * Writes to the given file a character-class representation of those
! 115: * characters present in the given CCL. A character is present if it
! 116: * has a non-zero value in the cset array.
! 117: */
! 118:
! 119: void list_character_set( file, cset )
! 120: FILE *file;
! 121: int cset[];
! 122: {
! 123: register int i;
! 124:
! 125: putc( '[', file );
! 126:
! 127: for ( i = 0; i < csize; ++i )
! 128: {
! 129: if ( cset[i] )
! 130: {
! 131: register int start_char = i;
! 132:
! 133: putc( ' ', file );
! 134:
! 135: fputs( readable_form( i ), file );
! 136:
! 137: while ( ++i < csize && cset[i] )
! 138: ;
! 139:
! 140: if ( i - 1 > start_char )
! 141: /* this was a run */
! 142: fprintf( file, "-%s", readable_form( i - 1 ) );
! 143:
! 144: putc( ' ', file );
! 145: }
! 146: }
! 147:
! 148: putc( ']', file );
! 149: }
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