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cci-src/external/libregex38a/regcomp.c  view on Meta::CPAN

	return(1);
}

/*
 - categorize - sort out character categories
 == static void categorize(struct parse *p, register struct cub_re_guts *g);
 */
static void
categorize(p, g)
struct parse *p;
register struct cub_re_guts *g;
{
	register cat_t *cats = g->categories;
	register int c;
	register int c2;
	register cat_t cat;

	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	for (c = CHAR_MIN; c <= CHAR_MAX; c++)
		if (cats[c] == 0 && isinsets(g, c)) {
			cat = g->ncategories++;
			cats[c] = cat;
			for (c2 = c+1; c2 <= CHAR_MAX; c2++)
				if (cats[c2] == 0 && samesets(g, c, c2))
					cats[c2] = cat;
		}
}

/*
 - dupl - emit a duplicate of a bunch of sops
 == static sopno dupl(register struct parse *p, sopno start, sopno finish);
 */
static sopno			/* start of duplicate */
dupl(p, start, finish)
register struct parse *p;
sopno start;			/* from here */
sopno finish;			/* to this less one */
{
	register sopno ret = HERE();
	register sopno len = finish - start;

	assert(finish >= start);
	if (len == 0)
		return(ret);
	enlarge(p, p->ssize + len);	/* this many unexpected additions */
	assert(p->ssize >= p->slen + len);
	(void) memcpy((char *)(p->strip + p->slen),
		(char *)(p->strip + start), (size_t)len*sizeof(sop));
	p->slen += len;
	return(ret);
}

/*
 - doemit - emit a strip operator
 == static void doemit(register struct parse *p, sop op, size_t opnd);
 *
 * It might seem better to implement this as a macro with a function as
 * hard-case backup, but it's just too big and messy unless there are
 * some changes to the data structures.  Maybe later.
 */
static void
doemit(p, op, opnd)
register struct parse *p;
sop op;
size_t opnd;
{
	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	/* deal with oversize operands ("can't happen", more or less) */
	assert(opnd < 1<<OPSHIFT);

	/* deal with undersized strip */
	if (p->slen >= p->ssize)
		enlarge(p, (p->ssize+1) / 2 * 3);	/* +50% */
	assert(p->slen < p->ssize);

	/* finally, it's all reduced to the easy case */
	p->strip[p->slen++] = SOP(op, opnd);
}

/*
 - doinsert - insert a sop into the strip
 == static void doinsert(register struct parse *p, sop op, size_t opnd, sopno pos);
 */
static void
doinsert(p, op, opnd, pos)
register struct parse *p;
sop op;
size_t opnd;
sopno pos;
{
	register sopno sn;
	register sop s;
	register int i;

	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	sn = HERE();
	EMIT(op, opnd);		/* do checks, ensure space */
	assert(HERE() == sn+1);
	s = p->strip[sn];

	/* adjust paren pointers */
	assert(pos > 0);
	for (i = 1; i < NPAREN; i++) {
		if (p->pbegin[i] >= pos) {
			p->pbegin[i]++;
		}
		if (p->pend[i] >= pos) {
			p->pend[i]++;
		}
	}

	memmove((char *)&p->strip[pos+1], (char *)&p->strip[pos],