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/*
* 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(
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 = nchrs;
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(
struct cvec *cv) /* character vector */
{
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(
struct cvec *cv, /* character vector */
pchr c) /* character to add */
{
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(
struct cvec *cv, /* character vector */
pchr from, /* first character of range */
pchr to) /* last character of range */
{
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(
struct cvec *cv, /* character vector */
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(
struct cvec *cv, /* character vector */
pchr c) /* character to test for */
{
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(
struct vars *v, /* context */
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(
struct cvec *cv) /* character vector */
{
FREE(cv);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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