1 files changed, 170 insertions, 0 deletions
diff --git a/generic/regc_cvec.c b/generic/regc_cvec.c
new file mode 100644
index 0000000..c79e741
--- /dev/null
+++ b/generic/regc_cvec.c
@@ -0,0 +1,170 @@
+/*
+ * Utility functions for handling cvecs
+ * This file is #included by regcomp.c.
+ */
+
+/*
+ - 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++;
+}
+
+#ifdef USE_MCCE
+/*
+ - 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 n = endp - startp;
+	int i;
+	chr *s;
+	chr *d;
+
+	assert(n > 0);
+	assert(cv->nchrs + n < cv->chrspace - cv->nmccechrs);
+	assert(cv->nmcces < cv->mccespace);
+	d = &cv->chrs[cv->chrspace - cv->nmccechrs - n - 1];
+	cv->mcces[cv->nmcces++] = d;
+	for (s = startp, i = n; i > 0; s++, i--)
+		*d++ = *s;
+	*d++ = 0;		/* endmarker */
+	assert(d == &cv->chrs[cv->chrspace - cv->nmccechrs]);
+	cv->nmccechrs += n + 1;
+}
+#endif
+
+/*
+ - 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);
+}