Adding upstream version 15.5.upstream/15.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 138 insertions, 0 deletions

diff --git a/src/backend/regex/regc_cvec.c b/src/backend/regex/regc_cvec.c
new file mode 100644
index 0000000..1030621
--- /dev/null
+++ b/src/backend/regex/regc_cvec.c
@@ -0,0 +1,138 @@
+/*
+ * 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.
+ *
+ * src/backend/regex/regc_cvec.c
+ *
+ */
+
+/*
+ * Notes:
+ * Only (selected) functions in _this_ file should treat the chr arrays
+ * of a cvec as non-constant.
+ */
+
+/*
+ * newcvec - allocate a new cvec
+ */
+static struct cvec *
+newcvec(int nchrs,				/* to hold this many chrs... */
+		int nranges)			/* ... and this many ranges */
+{
+	size_t		nc = (size_t) nchrs + (size_t) nranges * 2;
+	size_t		n = sizeof(struct cvec) + nc * sizeof(chr);
+	struct cvec *cv = (struct cvec *) MALLOC(n);
+
+	if (cv == NULL)
+		return NULL;
+	cv->chrspace = nchrs;
+	cv->chrs = (chr *) (((char *) cv) + sizeof(struct cvec));
+	cv->ranges = cv->chrs + nchrs;
+	cv->rangespace = nranges;
+	return clearcvec(cv);
+}
+
+/*
+ * clearcvec - clear a possibly-new cvec
+ * Returns pointer as convenience.
+ */
+static struct cvec *
+clearcvec(struct cvec *cv)
+{
+	assert(cv != NULL);
+	cv->nchrs = 0;
+	cv->nranges = 0;
+	cv->cclasscode = -1;
+	return cv;
+}
+
+/*
+ * addchr - add a chr to a cvec
+ */
+static void
+addchr(struct cvec *cv,			/* character vector */
+	   chr c)					/* character to add */
+{
+	assert(cv->nchrs < cv->chrspace);
+	cv->chrs[cv->nchrs++] = c;
+}
+
+/*
+ * addrange - add a range to a cvec
+ */
+static void
+addrange(struct cvec *cv,		/* character vector */
+		 chr from,				/* first character of range */
+		 chr to)				/* last character of range */
+{
+	assert(cv->nranges < cv->rangespace);
+	cv->ranges[cv->nranges * 2] = from;
+	cv->ranges[cv->nranges * 2 + 1] = to;
+	cv->nranges++;
+}
+
+/*
+ * getcvec - get a transient cvec, initialized to empty
+ *
+ * The returned cvec is valid only until the next call of getcvec, which
+ * typically will recycle the space.  Callers should *not* free the cvec
+ * explicitly; it will be cleaned up when the struct vars is destroyed.
+ *
+ * This is typically used while interpreting bracket expressions.  In that
+ * usage the cvec is only needed momentarily until we build arcs from it,
+ * so transientness is a convenient behavior.
+ */
+static struct cvec *
+getcvec(struct vars *v,			/* context */
+		int nchrs,				/* to hold this many chrs... */
+		int nranges)			/* ... and this many ranges */
+{
+	/* recycle existing transient cvec if large enough */
+	if (v->cv != NULL && nchrs <= v->cv->chrspace &&
+		nranges <= v->cv->rangespace)
+		return clearcvec(v->cv);
+
+	/* nope, make a new one */
+	if (v->cv != NULL)
+		freecvec(v->cv);
+	v->cv = newcvec(nchrs, nranges);
+	if (v->cv == NULL)
+		ERR(REG_ESPACE);
+
+	return v->cv;
+}
+
+/*
+ * freecvec - free a cvec
+ */
+static void
+freecvec(struct cvec *cv)
+{
+	FREE(cv);
+}