shared_source/c_tcl_base_7_5_w_mods/regc_cvec.c

/* $Header$ */
/*
 * Utility functions for handling cvecs
 * This file is #included by regcomp.c.
 *
 * Copyright (c) 1998, 1999 Henry Spencer.  All rights reserved.
 * 
 * Development of this software was funded, in part, by Cray Research Inc.,
 * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
 * Corporation, none of whom are responsible for the results.  The author
 * thanks all of them. 
 * 
 * Redistribution and use in source and binary forms -- with or without
 * modification -- are permitted for any purpose, provided that
 * redistributions in source form retain this entire copyright notice and
 * indicate the origin and nature of any modifications.
 * 
 * I'd appreciate being given credit for this package in the documentation
 * of software which uses it, but that is not a requirement.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/*
 - newcvec - allocate a new cvec
 ^ static struct cvec *newcvec(int, int, int);
 */
static struct cvec *
newcvec(nchrs, nranges, nmcces)
int nchrs;                      /* to hold this many chrs... */
int nranges;                    /* ... and this many ranges... */
int nmcces;                     /* ... and this many MCCEs */
{
        size_t n;
        size_t nc;
        struct cvec *cv;

        nc = (size_t)nchrs + (size_t)nmcces*(MAXMCCE+1) + (size_t)nranges*2;
        n = sizeof(struct cvec) + (size_t)(nmcces-1)*sizeof(chr *) +
                                                                nc*sizeof(chr);
        cv = (struct cvec *)MALLOC(n);
        if (cv == NULL)
                return NULL;
        cv->chrspace = nc;
        cv->chrs = (chr *)&cv->mcces[nmcces];   /* chrs just after MCCE ptrs */
        cv->mccespace = nmcces;
        cv->ranges = cv->chrs + nchrs + nmcces*(MAXMCCE+1);
        cv->rangespace = nranges;
        return clearcvec(cv);
}

/*
 - clearcvec - clear a possibly-new cvec
 * Returns pointer as convenience.
 ^ static struct cvec *clearcvec(struct cvec *);
 */
static struct cvec *
clearcvec(cv)
struct cvec *cv;
{
        int i;

        assert(cv != NULL);
        cv->nchrs = 0;
        assert(cv->chrs == (chr *)&cv->mcces[cv->mccespace]);
        cv->nmcces = 0;
        cv->nmccechrs = 0;
        cv->nranges = 0;
        for (i = 0; i < cv->mccespace; i++)
                cv->mcces[i] = NULL;

        return cv;
}

/*
 - addchr - add a chr to a cvec
 ^ static VOID addchr(struct cvec *, pchr);
 */
static VOID
addchr(cv, c)
struct cvec *cv;
pchr c;
{
        assert(cv->nchrs < cv->chrspace - cv->nmccechrs);
        cv->chrs[cv->nchrs++] = (chr)c;
}

/*
 - addrange - add a range to a cvec
 ^ static VOID addrange(struct cvec *, pchr, pchr);
 */
static VOID
addrange(cv, from, to)
struct cvec *cv;
pchr from;
pchr to;
{
        assert(cv->nranges < cv->rangespace);
        cv->ranges[cv->nranges*2] = (chr)from;
        cv->ranges[cv->nranges*2 + 1] = (chr)to;
        cv->nranges++;
}

/*
 - addmcce - add an MCCE to a cvec
 ^ static VOID addmcce(struct cvec *, chr *, chr *);
 */
static VOID
addmcce(cv, startp, endp)
struct cvec *cv;
chr *startp;                    /* beginning of text */
chr *endp;                      /* just past end of text */
{
        int len;
        int i;
        chr *s;
        chr *d;

        if (startp == NULL && endp == NULL)
                return;
        len = endp - startp;
        assert(len > 0);
        assert(cv->nchrs + len < cv->chrspace - cv->nmccechrs);
        assert(cv->nmcces < cv->mccespace);
        d = &cv->chrs[cv->chrspace - cv->nmccechrs - len - 1];
        cv->mcces[cv->nmcces++] = d;
        for (s = startp, i = len; i > 0; s++, i--)
                *d++ = *s;
        *d++ = 0;               /* endmarker */
        assert(d == &cv->chrs[cv->chrspace - cv->nmccechrs]);
        cv->nmccechrs += len + 1;
}

/*
 - haschr - does a cvec contain this chr?
 ^ static int haschr(struct cvec *, pchr);
 */
static int                      /* predicate */
haschr(cv, c)
struct cvec *cv;
pchr c;
{
        int i;
        chr *p;

        for (p = cv->chrs, i = cv->nchrs; i > 0; p++, i--)
                if (*p == c)
                        return 1;
        for (p = cv->ranges, i = cv->nranges; i > 0; p += 2, i--)
                if (*p <= c && c <= *(p+1))
                        return 1;
        return 0;
}

/*
 - getcvec - get a cvec, remembering it as v->cv
 ^ static struct cvec *getcvec(struct vars *, int, int, int);
 */
static struct cvec *
getcvec(v, nchrs, nranges, nmcces)
struct vars *v;
int nchrs;                      /* to hold this many chrs... */
int nranges;                    /* ... and this many ranges... */
int nmcces;                     /* ... and this many MCCEs */
{
        if (v->cv != NULL && nchrs <= v->cv->chrspace &&
                                        nranges <= v->cv->rangespace &&
                                        nmcces <= v->cv->mccespace)
                return clearcvec(v->cv);

        if (v->cv != NULL)
                freecvec(v->cv);
        v->cv = newcvec(nchrs, nranges, nmcces);
        if (v->cv == NULL)
                ERR(REG_ESPACE);

        return v->cv;
}

/*
 - freecvec - free a cvec
 ^ static VOID freecvec(struct cvec *);
 */
static VOID
freecvec(cv)
struct cvec *cv;
{
        FREE(cv);
}

/* End of regc_cvec.c */
1	dashley	64	/* $Header$ */
2	dashley	25	/*
3			* Utility functions for handling cvecs
4			* This file is #included by regcomp.c.
5			*
6			* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
7			*
8			* Development of this software was funded, in part, by Cray Research Inc.,
9			* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
10			* Corporation, none of whom are responsible for the results. The author
11			* thanks all of them.
12			*
13			* Redistribution and use in source and binary forms -- with or without
14			* modification -- are permitted for any purpose, provided that
15			* redistributions in source form retain this entire copyright notice and
16			* indicate the origin and nature of any modifications.
17			*
18			* I'd appreciate being given credit for this package in the documentation
19			* of software which uses it, but that is not a requirement.
20			*
21			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
22			* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
23			* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
24			* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25			* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26			* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27			* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29			* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
30			* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31			*
32			*/
33
34			/*
35			- newcvec - allocate a new cvec
36			^ static struct cvec *newcvec(int, int, int);
37			*/
38			static struct cvec *
39			newcvec(nchrs, nranges, nmcces)
40			int nchrs; /* to hold this many chrs... */
41			int nranges; /* ... and this many ranges... */
42			int nmcces; /* ... and this many MCCEs */
43			{
44			size_t n;
45			size_t nc;
46			struct cvec *cv;
47
48			nc = (size_t)nchrs + (size_t)nmcces(MAXMCCE+1) + (size_t)nranges2;
49			n = sizeof(struct cvec) + (size_t)(nmcces-1)sizeof(chr ) +
50			nc*sizeof(chr);
51			cv = (struct cvec *)MALLOC(n);
52			if (cv == NULL)
53			return NULL;
54			cv->chrspace = nc;
55			cv->chrs = (chr )&cv->mcces[nmcces]; / chrs just after MCCE ptrs */
56			cv->mccespace = nmcces;
57			cv->ranges = cv->chrs + nchrs + nmcces*(MAXMCCE+1);
58			cv->rangespace = nranges;
59			return clearcvec(cv);
60			}
61
62			/*
63			- clearcvec - clear a possibly-new cvec
64			* Returns pointer as convenience.
65			^ static struct cvec clearcvec(struct cvec );
66			*/
67			static struct cvec *
68			clearcvec(cv)
69			struct cvec *cv;
70			{
71			int i;
72
73			assert(cv != NULL);
74			cv->nchrs = 0;
75			assert(cv->chrs == (chr *)&cv->mcces[cv->mccespace]);
76			cv->nmcces = 0;
77			cv->nmccechrs = 0;
78			cv->nranges = 0;
79			for (i = 0; i < cv->mccespace; i++)
80			cv->mcces[i] = NULL;
81
82			return cv;
83			}
84
85			/*
86			- addchr - add a chr to a cvec
87			^ static VOID addchr(struct cvec *, pchr);
88			*/
89			static VOID
90			addchr(cv, c)
91			struct cvec *cv;
92			pchr c;
93			{
94			assert(cv->nchrs < cv->chrspace - cv->nmccechrs);
95			cv->chrs[cv->nchrs++] = (chr)c;
96			}
97
98			/*
99			- addrange - add a range to a cvec
100			^ static VOID addrange(struct cvec *, pchr, pchr);
101			*/
102			static VOID
103			addrange(cv, from, to)
104			struct cvec *cv;
105			pchr from;
106			pchr to;
107			{
108			assert(cv->nranges < cv->rangespace);
109			cv->ranges[cv->nranges*2] = (chr)from;
110			cv->ranges[cv->nranges*2 + 1] = (chr)to;
111			cv->nranges++;
112			}
113
114			/*
115			- addmcce - add an MCCE to a cvec
116			^ static VOID addmcce(struct cvec , chr , chr *);
117			*/
118			static VOID
119			addmcce(cv, startp, endp)
120			struct cvec *cv;
121			chr startp; / beginning of text */
122			chr endp; / just past end of text */
123			{
124			int len;
125			int i;
126			chr *s;
127			chr *d;
128
129			if (startp == NULL && endp == NULL)
130			return;
131			len = endp - startp;
132			assert(len > 0);
133			assert(cv->nchrs + len < cv->chrspace - cv->nmccechrs);
134			assert(cv->nmcces < cv->mccespace);
135			d = &cv->chrs[cv->chrspace - cv->nmccechrs - len - 1];
136			cv->mcces[cv->nmcces++] = d;
137			for (s = startp, i = len; i > 0; s++, i--)
138			d++ = s;
139			d++ = 0; / endmarker */
140			assert(d == &cv->chrs[cv->chrspace - cv->nmccechrs]);
141			cv->nmccechrs += len + 1;
142			}
143
144			/*
145			- haschr - does a cvec contain this chr?
146			^ static int haschr(struct cvec *, pchr);
147			*/
148			static int /* predicate */
149			haschr(cv, c)
150			struct cvec *cv;
151			pchr c;
152			{
153			int i;
154			chr *p;
155
156			for (p = cv->chrs, i = cv->nchrs; i > 0; p++, i--)
157			if (*p == c)
158			return 1;
159			for (p = cv->ranges, i = cv->nranges; i > 0; p += 2, i--)
160			if (p <= c && c <= (p+1))
161			return 1;
162			return 0;
163			}
164
165			/*
166			- getcvec - get a cvec, remembering it as v->cv
167			^ static struct cvec getcvec(struct vars , int, int, int);
168			*/
169			static struct cvec *
170			getcvec(v, nchrs, nranges, nmcces)
171			struct vars *v;
172			int nchrs; /* to hold this many chrs... */
173			int nranges; /* ... and this many ranges... */
174			int nmcces; /* ... and this many MCCEs */
175			{
176			if (v->cv != NULL && nchrs <= v->cv->chrspace &&
177			nranges <= v->cv->rangespace &&
178			nmcces <= v->cv->mccespace)
179			return clearcvec(v->cv);
180
181			if (v->cv != NULL)
182			freecvec(v->cv);
183			v->cv = newcvec(nchrs, nranges, nmcces);
184			if (v->cv == NULL)
185			ERR(REG_ESPACE);
186
187			return v->cv;
188			}
189
190			/*
191			- freecvec - free a cvec
192			^ static VOID freecvec(struct cvec *);
193			*/
194			static VOID
195			freecvec(cv)
196			struct cvec *cv;
197			{
198			FREE(cv);
199			}
200
201	dashley	67	/* End of regc_cvec.c */