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Diffstat (limited to 'generic/regc_cvec.c')
-rw-r--r-- | generic/regc_cvec.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/generic/regc_cvec.c b/generic/regc_cvec.c new file mode 100644 index 0000000..d450d3e --- /dev/null +++ b/generic/regc_cvec.c @@ -0,0 +1,147 @@ +/* + * 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. + */ + +/* + * Notes: + * Only (selected) functions in _this_ file should treat chr* as non-constant. + */ + +/* + - newcvec - allocate a new cvec + ^ static struct cvec *newcvec(int, int); + */ +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 *); + */ +static struct cvec * +clearcvec( + struct cvec *cv) /* character vector */ +{ + assert(cv != NULL); + cv->nchrs = 0; + cv->nranges = 0; + 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->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++; +} + +/* + - getcvec - get a cvec, remembering it as v->cv + ^ static struct cvec *getcvec(struct vars *, int, int); + */ +static struct cvec * +getcvec( + struct vars *v, /* context */ + int nchrs, /* to hold this many chrs... */ + int nranges) /* ... and this many ranges... */ +{ + if ((v->cv != NULL) && (nchrs <= v->cv->chrspace) && + (nranges <= v->cv->rangespace)) { + return clearcvec(v->cv); + } + + 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 *); + */ +static void +freecvec( + struct cvec *cv) /* character vector */ +{ + FREE(cv); +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |