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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.
*
* src/backend/regex/regc_cvec.c
*
*/
/*
* Notes:
* Only (selected) functions in _this_ file should treat chr* 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;
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++] = (chr) 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] = (chr) from;
cv->ranges[cv->nranges * 2 + 1] = (chr) 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);
}
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