Import the latest bsd-features branch of the one-true-awk upstream: o Move to bison for $YACC o Set close-on-exec flag for file and pipe redirects that aren't std* o lots of little fixes to modernize ocde base o free sval member before setting it o fix a bug where a{0,3} could match aaaa o pull in systime and strftime from NetBSD awk o pull in fixes from {Net,Free,Open}BSD (normalized our code with them) o add BSD extensions and, or, xor, compl, lsheift, rshift (mostly a nop) Also revert a few of the trivial FreeBSD changes that were done slightly differently in the upstreaming process. Also, our PR database may have been mined by upstream for these fixes, and Mikolaj Golub may deserve credit for some of the fixes in this update. Suggested by: Mikolaj Golub <to.my.trociny@gmail.com> PR: 143363,143365,143368,143369,143373,143375,214782 Sponsored by: Netflix
1392 lines
33 KiB
C
1392 lines
33 KiB
C
/****************************************************************
|
|
Copyright (C) Lucent Technologies 1997
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|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and
|
|
its documentation for any purpose and without fee is hereby
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|
granted, provided that the above copyright notice appear in all
|
|
copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name Lucent Technologies or any of
|
|
its entities not be used in advertising or publicity pertaining
|
|
to distribution of the software without specific, written prior
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|
permission.
|
|
|
|
LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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|
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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|
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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|
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
|
|
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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|
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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|
THIS SOFTWARE.
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|
****************************************************************/
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|
|
/* lasciate ogne speranza, voi ch'intrate. */
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#define DEBUG
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|
|
|
#include <ctype.h>
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|
#include <limits.h>
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|
#include <stdio.h>
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|
#include <string.h>
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|
#include <stdlib.h>
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|
#include "awk.h"
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|
#include "awkgram.tab.h"
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|
|
|
#define MAXLIN 22
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|
|
|
#define type(v) (v)->nobj /* badly overloaded here */
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|
#define info(v) (v)->ntype /* badly overloaded here */
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|
#define left(v) (v)->narg[0]
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|
#define right(v) (v)->narg[1]
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|
#define parent(v) (v)->nnext
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|
|
|
#define LEAF case CCL: case NCCL: case CHAR: case DOT: case FINAL: case ALL:
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|
#define ELEAF case EMPTYRE: /* empty string in regexp */
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|
#define UNARY case STAR: case PLUS: case QUEST:
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|
|
|
/* encoding in tree Nodes:
|
|
leaf (CCL, NCCL, CHAR, DOT, FINAL, ALL, EMPTYRE):
|
|
left is index, right contains value or pointer to value
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|
unary (STAR, PLUS, QUEST): left is child, right is null
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|
binary (CAT, OR): left and right are children
|
|
parent contains pointer to parent
|
|
*/
|
|
|
|
|
|
int *setvec;
|
|
int *tmpset;
|
|
int maxsetvec = 0;
|
|
|
|
int rtok; /* next token in current re */
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|
int rlxval;
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|
static const uschar *rlxstr;
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|
static const uschar *prestr; /* current position in current re */
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|
static const uschar *lastre; /* origin of last re */
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|
static const uschar *lastatom; /* origin of last Atom */
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|
static const uschar *starttok;
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|
static const uschar *basestr; /* starts with original, replaced during
|
|
repetition processing */
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|
static const uschar *firstbasestr;
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|
|
|
static int setcnt;
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|
static int poscnt;
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|
|
|
const char *patbeg;
|
|
int patlen;
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|
|
|
#define NFA 128 /* cache this many dynamic fa's */
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|
fa *fatab[NFA];
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|
int nfatab = 0; /* entries in fatab */
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|
|
|
static int *
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|
intalloc(size_t n, const char *f)
|
|
{
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|
int *p = (int *) calloc(n, sizeof(int));
|
|
if (p == NULL)
|
|
overflo(f);
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|
return p;
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|
}
|
|
|
|
static void
|
|
resizesetvec(const char *f)
|
|
{
|
|
if (maxsetvec == 0)
|
|
maxsetvec = MAXLIN;
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|
else
|
|
maxsetvec *= 4;
|
|
setvec = (int *) realloc(setvec, maxsetvec * sizeof(*setvec));
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|
tmpset = (int *) realloc(tmpset, maxsetvec * sizeof(*tmpset));
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|
if (setvec == NULL || tmpset == NULL)
|
|
overflo(f);
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|
}
|
|
|
|
static void
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|
resize_state(fa *f, int state)
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|
{
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|
unsigned int **p;
|
|
uschar *p2;
|
|
int **p3;
|
|
int i, new_count;
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|
|
|
if (++state < f->state_count)
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|
return;
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|
|
|
new_count = state + 10; /* needs to be tuned */
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|
|
|
p = (unsigned int **) realloc(f->gototab, new_count * sizeof(f->gototab[0]));
|
|
if (p == NULL)
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|
goto out;
|
|
f->gototab = p;
|
|
|
|
p2 = (uschar *) realloc(f->out, new_count * sizeof(f->out[0]));
|
|
if (p2 == NULL)
|
|
goto out;
|
|
f->out = p2;
|
|
|
|
p3 = (int **) realloc(f->posns, new_count * sizeof(f->posns[0]));
|
|
if (p3 == NULL)
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|
goto out;
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|
f->posns = p3;
|
|
|
|
for (i = f->state_count; i < new_count; ++i) {
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|
f->gototab[i] = (unsigned int *) calloc(NCHARS, sizeof(**f->gototab));
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|
if (f->gototab[i] == NULL)
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|
goto out;
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|
f->out[i] = 0;
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|
f->posns[i] = NULL;
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|
}
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|
f->state_count = new_count;
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|
return;
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|
out:
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|
overflo(__func__);
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|
}
|
|
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|
fa *makedfa(const char *s, bool anchor) /* returns dfa for reg expr s */
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|
{
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|
int i, use, nuse;
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|
fa *pfa;
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|
static int now = 1;
|
|
|
|
if (setvec == NULL) { /* first time through any RE */
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|
resizesetvec(__func__);
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|
}
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|
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|
if (compile_time != RUNNING) /* a constant for sure */
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|
return mkdfa(s, anchor);
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|
for (i = 0; i < nfatab; i++) /* is it there already? */
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|
if (fatab[i]->anchor == anchor
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&& strcmp((const char *) fatab[i]->restr, s) == 0) {
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|
fatab[i]->use = now++;
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|
return fatab[i];
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|
}
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|
pfa = mkdfa(s, anchor);
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|
if (nfatab < NFA) { /* room for another */
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|
fatab[nfatab] = pfa;
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|
fatab[nfatab]->use = now++;
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|
nfatab++;
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|
return pfa;
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|
}
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|
use = fatab[0]->use; /* replace least-recently used */
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|
nuse = 0;
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|
for (i = 1; i < nfatab; i++)
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|
if (fatab[i]->use < use) {
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|
use = fatab[i]->use;
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|
nuse = i;
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|
}
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|
freefa(fatab[nuse]);
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|
fatab[nuse] = pfa;
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|
pfa->use = now++;
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|
return pfa;
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|
}
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|
|
|
fa *mkdfa(const char *s, bool anchor) /* does the real work of making a dfa */
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|
/* anchor = true for anchored matches, else false */
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|
{
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|
Node *p, *p1;
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|
fa *f;
|
|
|
|
firstbasestr = (const uschar *) s;
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|
basestr = firstbasestr;
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|
p = reparse(s);
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|
p1 = op2(CAT, op2(STAR, op2(ALL, NIL, NIL), NIL), p);
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|
/* put ALL STAR in front of reg. exp. */
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|
p1 = op2(CAT, p1, op2(FINAL, NIL, NIL));
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|
/* put FINAL after reg. exp. */
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|
|
|
poscnt = 0;
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|
penter(p1); /* enter parent pointers and leaf indices */
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|
if ((f = (fa *) calloc(1, sizeof(fa) + poscnt * sizeof(rrow))) == NULL)
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|
overflo(__func__);
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|
f->accept = poscnt-1; /* penter has computed number of positions in re */
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|
cfoll(f, p1); /* set up follow sets */
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|
freetr(p1);
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|
resize_state(f, 1);
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|
f->posns[0] = intalloc(*(f->re[0].lfollow), __func__);
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|
f->posns[1] = intalloc(1, __func__);
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|
*f->posns[1] = 0;
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f->initstat = makeinit(f, anchor);
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|
f->anchor = anchor;
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|
f->restr = (uschar *) tostring(s);
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|
if (firstbasestr != basestr) {
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|
if (basestr)
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|
xfree(basestr);
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|
}
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|
return f;
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|
}
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|
int makeinit(fa *f, bool anchor)
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|
{
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|
int i, k;
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|
f->curstat = 2;
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|
f->out[2] = 0;
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|
k = *(f->re[0].lfollow);
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xfree(f->posns[2]);
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f->posns[2] = intalloc(k + 1, __func__);
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for (i = 0; i <= k; i++) {
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(f->posns[2])[i] = (f->re[0].lfollow)[i];
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}
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|
if ((f->posns[2])[1] == f->accept)
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f->out[2] = 1;
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for (i = 0; i < NCHARS; i++)
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f->gototab[2][i] = 0;
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f->curstat = cgoto(f, 2, HAT);
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if (anchor) {
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*f->posns[2] = k-1; /* leave out position 0 */
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for (i = 0; i < k; i++) {
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(f->posns[0])[i] = (f->posns[2])[i];
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}
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|
f->out[0] = f->out[2];
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|
if (f->curstat != 2)
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|
--(*f->posns[f->curstat]);
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|
}
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|
return f->curstat;
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|
}
|
|
|
|
void penter(Node *p) /* set up parent pointers and leaf indices */
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|
{
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|
switch (type(p)) {
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|
ELEAF
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|
LEAF
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|
info(p) = poscnt;
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|
poscnt++;
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|
break;
|
|
UNARY
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|
penter(left(p));
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|
parent(left(p)) = p;
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|
break;
|
|
case CAT:
|
|
case OR:
|
|
penter(left(p));
|
|
penter(right(p));
|
|
parent(left(p)) = p;
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|
parent(right(p)) = p;
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|
break;
|
|
case ZERO:
|
|
break;
|
|
default: /* can't happen */
|
|
FATAL("can't happen: unknown type %d in penter", type(p));
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|
break;
|
|
}
|
|
}
|
|
|
|
void freetr(Node *p) /* free parse tree */
|
|
{
|
|
switch (type(p)) {
|
|
ELEAF
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|
LEAF
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|
xfree(p);
|
|
break;
|
|
UNARY
|
|
case ZERO:
|
|
freetr(left(p));
|
|
xfree(p);
|
|
break;
|
|
case CAT:
|
|
case OR:
|
|
freetr(left(p));
|
|
freetr(right(p));
|
|
xfree(p);
|
|
break;
|
|
default: /* can't happen */
|
|
FATAL("can't happen: unknown type %d in freetr", type(p));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* in the parsing of regular expressions, metacharacters like . have */
|
|
/* to be seen literally; \056 is not a metacharacter. */
|
|
|
|
int hexstr(const uschar **pp) /* find and eval hex string at pp, return new p */
|
|
{ /* only pick up one 8-bit byte (2 chars) */
|
|
const uschar *p;
|
|
int n = 0;
|
|
int i;
|
|
|
|
for (i = 0, p = *pp; i < 2 && isxdigit(*p); i++, p++) {
|
|
if (isdigit(*p))
|
|
n = 16 * n + *p - '0';
|
|
else if (*p >= 'a' && *p <= 'f')
|
|
n = 16 * n + *p - 'a' + 10;
|
|
else if (*p >= 'A' && *p <= 'F')
|
|
n = 16 * n + *p - 'A' + 10;
|
|
}
|
|
*pp = p;
|
|
return n;
|
|
}
|
|
|
|
#define isoctdigit(c) ((c) >= '0' && (c) <= '7') /* multiple use of arg */
|
|
|
|
int quoted(const uschar **pp) /* pick up next thing after a \\ */
|
|
/* and increment *pp */
|
|
{
|
|
const uschar *p = *pp;
|
|
int c;
|
|
|
|
if ((c = *p++) == 't')
|
|
c = '\t';
|
|
else if (c == 'n')
|
|
c = '\n';
|
|
else if (c == 'f')
|
|
c = '\f';
|
|
else if (c == 'r')
|
|
c = '\r';
|
|
else if (c == 'b')
|
|
c = '\b';
|
|
else if (c == 'v')
|
|
c = '\v';
|
|
else if (c == 'a')
|
|
c = '\a';
|
|
else if (c == '\\')
|
|
c = '\\';
|
|
else if (c == 'x') { /* hexadecimal goo follows */
|
|
c = hexstr(&p); /* this adds a null if number is invalid */
|
|
} else if (isoctdigit(c)) { /* \d \dd \ddd */
|
|
int n = c - '0';
|
|
if (isoctdigit(*p)) {
|
|
n = 8 * n + *p++ - '0';
|
|
if (isoctdigit(*p))
|
|
n = 8 * n + *p++ - '0';
|
|
}
|
|
c = n;
|
|
} /* else */
|
|
/* c = c; */
|
|
*pp = p;
|
|
return c;
|
|
}
|
|
|
|
static int collate_range_cmp(int a, int b)
|
|
{
|
|
static char s[2][2];
|
|
|
|
if ((uschar)a == (uschar)b)
|
|
return 0;
|
|
s[0][0] = a;
|
|
s[1][0] = b;
|
|
return (strcoll(s[0], s[1]));
|
|
}
|
|
|
|
char *cclenter(const char *argp) /* add a character class */
|
|
{
|
|
int i, c, c2, j;
|
|
const uschar *op, *p = (const uschar *) argp;
|
|
uschar *bp;
|
|
static uschar *buf = NULL;
|
|
static int bufsz = 100;
|
|
|
|
op = p;
|
|
if (buf == NULL && (buf = (uschar *) malloc(bufsz)) == NULL)
|
|
FATAL("out of space for character class [%.10s...] 1", p);
|
|
bp = buf;
|
|
for (i = 0; (c = *p++) != 0; ) {
|
|
if (c == '\\') {
|
|
c = quoted(&p);
|
|
} else if (c == '-' && i > 0 && bp[-1] != 0) {
|
|
if (*p != 0) {
|
|
c = bp[-1];
|
|
c2 = *p++;
|
|
if (c2 == '\\')
|
|
c2 = quoted(&p);
|
|
if (collate_range_cmp(c, c2) > 0) {
|
|
bp--;
|
|
i--;
|
|
continue;
|
|
}
|
|
for (j = 0; j < NCHARS; j++) {
|
|
if ((collate_range_cmp(c, j) > 0) ||
|
|
collate_range_cmp(j, c2) > 0)
|
|
continue;
|
|
if (!adjbuf((char **) &buf, &bufsz, bp-buf+2, 100, (char **) &bp, "cclenter1"))
|
|
FATAL("out of space for character class [%.10s...] 2", p);
|
|
*bp++ = j;
|
|
i++;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
if (!adjbuf((char **) &buf, &bufsz, bp-buf+2, 100, (char **) &bp, "cclenter2"))
|
|
FATAL("out of space for character class [%.10s...] 3", p);
|
|
*bp++ = c;
|
|
i++;
|
|
}
|
|
*bp = 0;
|
|
DPRINTF("cclenter: in = |%s|, out = |%s|\n", op, buf);
|
|
xfree(op);
|
|
return (char *) tostring((char *) buf);
|
|
}
|
|
|
|
void overflo(const char *s)
|
|
{
|
|
FATAL("regular expression too big: out of space in %.30s...", s);
|
|
}
|
|
|
|
void cfoll(fa *f, Node *v) /* enter follow set of each leaf of vertex v into lfollow[leaf] */
|
|
{
|
|
int i;
|
|
int *p;
|
|
|
|
switch (type(v)) {
|
|
ELEAF
|
|
LEAF
|
|
f->re[info(v)].ltype = type(v);
|
|
f->re[info(v)].lval.np = right(v);
|
|
while (f->accept >= maxsetvec) { /* guessing here! */
|
|
resizesetvec(__func__);
|
|
}
|
|
for (i = 0; i <= f->accept; i++)
|
|
setvec[i] = 0;
|
|
setcnt = 0;
|
|
follow(v); /* computes setvec and setcnt */
|
|
p = intalloc(setcnt + 1, __func__);
|
|
f->re[info(v)].lfollow = p;
|
|
*p = setcnt;
|
|
for (i = f->accept; i >= 0; i--)
|
|
if (setvec[i] == 1)
|
|
*++p = i;
|
|
break;
|
|
UNARY
|
|
cfoll(f,left(v));
|
|
break;
|
|
case CAT:
|
|
case OR:
|
|
cfoll(f,left(v));
|
|
cfoll(f,right(v));
|
|
break;
|
|
case ZERO:
|
|
break;
|
|
default: /* can't happen */
|
|
FATAL("can't happen: unknown type %d in cfoll", type(v));
|
|
}
|
|
}
|
|
|
|
int first(Node *p) /* collects initially active leaves of p into setvec */
|
|
/* returns 0 if p matches empty string */
|
|
{
|
|
int b, lp;
|
|
|
|
switch (type(p)) {
|
|
ELEAF
|
|
LEAF
|
|
lp = info(p); /* look for high-water mark of subscripts */
|
|
while (setcnt >= maxsetvec || lp >= maxsetvec) { /* guessing here! */
|
|
resizesetvec(__func__);
|
|
}
|
|
if (type(p) == EMPTYRE) {
|
|
setvec[lp] = 0;
|
|
return(0);
|
|
}
|
|
if (setvec[lp] != 1) {
|
|
setvec[lp] = 1;
|
|
setcnt++;
|
|
}
|
|
if (type(p) == CCL && (*(char *) right(p)) == '\0')
|
|
return(0); /* empty CCL */
|
|
return(1);
|
|
case PLUS:
|
|
if (first(left(p)) == 0)
|
|
return(0);
|
|
return(1);
|
|
case STAR:
|
|
case QUEST:
|
|
first(left(p));
|
|
return(0);
|
|
case CAT:
|
|
if (first(left(p)) == 0 && first(right(p)) == 0) return(0);
|
|
return(1);
|
|
case OR:
|
|
b = first(right(p));
|
|
if (first(left(p)) == 0 || b == 0) return(0);
|
|
return(1);
|
|
case ZERO:
|
|
return 0;
|
|
}
|
|
FATAL("can't happen: unknown type %d in first", type(p)); /* can't happen */
|
|
return(-1);
|
|
}
|
|
|
|
void follow(Node *v) /* collects leaves that can follow v into setvec */
|
|
{
|
|
Node *p;
|
|
|
|
if (type(v) == FINAL)
|
|
return;
|
|
p = parent(v);
|
|
switch (type(p)) {
|
|
case STAR:
|
|
case PLUS:
|
|
first(v);
|
|
follow(p);
|
|
return;
|
|
|
|
case OR:
|
|
case QUEST:
|
|
follow(p);
|
|
return;
|
|
|
|
case CAT:
|
|
if (v == left(p)) { /* v is left child of p */
|
|
if (first(right(p)) == 0) {
|
|
follow(p);
|
|
return;
|
|
}
|
|
} else /* v is right child */
|
|
follow(p);
|
|
return;
|
|
}
|
|
}
|
|
|
|
int member(int c, const char *sarg) /* is c in s? */
|
|
{
|
|
const uschar *s = (const uschar *) sarg;
|
|
|
|
while (*s)
|
|
if (c == *s++)
|
|
return(1);
|
|
return(0);
|
|
}
|
|
|
|
int match(fa *f, const char *p0) /* shortest match ? */
|
|
{
|
|
int s, ns;
|
|
const uschar *p = (const uschar *) p0;
|
|
|
|
s = f->initstat;
|
|
assert (s < f->state_count);
|
|
|
|
if (f->out[s])
|
|
return(1);
|
|
do {
|
|
/* assert(*p < NCHARS); */
|
|
if ((ns = f->gototab[s][*p]) != 0)
|
|
s = ns;
|
|
else
|
|
s = cgoto(f, s, *p);
|
|
if (f->out[s])
|
|
return(1);
|
|
} while (*p++ != 0);
|
|
return(0);
|
|
}
|
|
|
|
int pmatch(fa *f, const char *p0) /* longest match, for sub */
|
|
{
|
|
int s, ns;
|
|
const uschar *p = (const uschar *) p0;
|
|
const uschar *q;
|
|
|
|
s = f->initstat;
|
|
assert(s < f->state_count);
|
|
|
|
patbeg = (const char *)p;
|
|
patlen = -1;
|
|
do {
|
|
q = p;
|
|
do {
|
|
if (f->out[s]) /* final state */
|
|
patlen = q-p;
|
|
/* assert(*q < NCHARS); */
|
|
if ((ns = f->gototab[s][*q]) != 0)
|
|
s = ns;
|
|
else
|
|
s = cgoto(f, s, *q);
|
|
|
|
assert(s < f->state_count);
|
|
|
|
if (s == 1) { /* no transition */
|
|
if (patlen >= 0) {
|
|
patbeg = (const char *) p;
|
|
return(1);
|
|
}
|
|
else
|
|
goto nextin; /* no match */
|
|
}
|
|
} while (*q++ != 0);
|
|
if (f->out[s])
|
|
patlen = q-p-1; /* don't count $ */
|
|
if (patlen >= 0) {
|
|
patbeg = (const char *) p;
|
|
return(1);
|
|
}
|
|
nextin:
|
|
s = 2;
|
|
#if 0 /* XXX */
|
|
if (f->reset) {
|
|
for (i = 2; i <= f->curstat; i++)
|
|
n xfree(f->posns[i]);
|
|
k = *f->posns[0];
|
|
if ((f->posns[2] = (int *) calloc(k+1, sizeof(int))) == NULL)
|
|
overflo("out of space in pmatch");
|
|
for (i = 0; i <= k; i++)
|
|
(f->posns[2])[i] = (f->posns[0])[i];
|
|
f->initstat = f->curstat = 2;
|
|
f->out[2] = f->out[0];
|
|
for (i = 0; i < NCHARS; i++)
|
|
f->gototab[2][i] = 0;
|
|
}
|
|
#endif
|
|
} while (*p++ != 0);
|
|
return (0);
|
|
}
|
|
|
|
int nematch(fa *f, const char *p0) /* non-empty match, for sub */
|
|
{
|
|
int s, ns;
|
|
const uschar *p = (const uschar *) p0;
|
|
const uschar *q;
|
|
|
|
s = f->initstat;
|
|
assert(s < f->state_count);
|
|
|
|
patbeg = (const char *)p;
|
|
patlen = -1;
|
|
while (*p) {
|
|
q = p;
|
|
do {
|
|
if (f->out[s]) /* final state */
|
|
patlen = q-p;
|
|
/* assert(*q < NCHARS); */
|
|
if ((ns = f->gototab[s][*q]) != 0)
|
|
s = ns;
|
|
else
|
|
s = cgoto(f, s, *q);
|
|
if (s == 1) { /* no transition */
|
|
if (patlen > 0) {
|
|
patbeg = (const char *) p;
|
|
return(1);
|
|
} else
|
|
goto nnextin; /* no nonempty match */
|
|
}
|
|
} while (*q++ != 0);
|
|
if (f->out[s])
|
|
patlen = q-p-1; /* don't count $ */
|
|
if (patlen > 0 ) {
|
|
patbeg = (const char *) p;
|
|
return(1);
|
|
}
|
|
nnextin:
|
|
s = 2;
|
|
#if 0 /* XXX */
|
|
if (f->reset) {
|
|
for (i = 2; i <= f->curstat; i++)
|
|
xfree(f->posns[i]);
|
|
k = *f->posns[0];
|
|
if ((f->posns[2] = (int *) calloc(k+1, sizeof(int))) == NULL)
|
|
overflo("out of state space");
|
|
for (i = 0; i <= k; i++)
|
|
(f->posns[2])[i] = (f->posns[0])[i];
|
|
f->initstat = f->curstat = 2;
|
|
f->out[2] = f->out[0];
|
|
for (i = 0; i < NCHARS; i++)
|
|
f->gototab[2][i] = 0;
|
|
}
|
|
#endif
|
|
p++;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* NAME
|
|
* fnematch
|
|
*
|
|
* DESCRIPTION
|
|
* A stream-fed version of nematch which transfers characters to a
|
|
* null-terminated buffer. All characters up to and including the last
|
|
* character of the matching text or EOF are placed in the buffer. If
|
|
* a match is found, patbeg and patlen are set appropriately.
|
|
*
|
|
* RETURN VALUES
|
|
* false No match found.
|
|
* true Match found.
|
|
*/
|
|
|
|
bool fnematch(fa *pfa, FILE *f, char **pbuf, int *pbufsize, int quantum)
|
|
{
|
|
char *buf = *pbuf;
|
|
int bufsize = *pbufsize;
|
|
int c, i, j, k, ns, s;
|
|
|
|
s = pfa->initstat;
|
|
patlen = 0;
|
|
|
|
/*
|
|
* All indices relative to buf.
|
|
* i <= j <= k <= bufsize
|
|
*
|
|
* i: origin of active substring
|
|
* j: current character
|
|
* k: destination of next getc()
|
|
*/
|
|
i = -1, k = 0;
|
|
do {
|
|
j = i++;
|
|
do {
|
|
if (++j == k) {
|
|
if (k == bufsize)
|
|
if (!adjbuf((char **) &buf, &bufsize, bufsize+1, quantum, 0, "fnematch"))
|
|
FATAL("stream '%.30s...' too long", buf);
|
|
buf[k++] = (c = getc(f)) != EOF ? c : 0;
|
|
}
|
|
c = (uschar)buf[j];
|
|
/* assert(c < NCHARS); */
|
|
|
|
if ((ns = pfa->gototab[s][c]) != 0)
|
|
s = ns;
|
|
else
|
|
s = cgoto(pfa, s, c);
|
|
|
|
if (pfa->out[s]) { /* final state */
|
|
patlen = j - i + 1;
|
|
if (c == 0) /* don't count $ */
|
|
patlen--;
|
|
}
|
|
} while (buf[j] && s != 1);
|
|
s = 2;
|
|
} while (buf[i] && !patlen);
|
|
|
|
/* adjbuf() may have relocated a resized buffer. Inform the world. */
|
|
*pbuf = buf;
|
|
*pbufsize = bufsize;
|
|
|
|
if (patlen) {
|
|
patbeg = (char *) buf + i;
|
|
/*
|
|
* Under no circumstances is the last character fed to
|
|
* the automaton part of the match. It is EOF's nullbyte,
|
|
* or it sent the automaton into a state with no further
|
|
* transitions available (s==1), or both. Room for a
|
|
* terminating nullbyte is guaranteed.
|
|
*
|
|
* ungetc any chars after the end of matching text
|
|
* (except for EOF's nullbyte, if present) and null
|
|
* terminate the buffer.
|
|
*/
|
|
do
|
|
if (buf[--k] && ungetc(buf[k], f) == EOF)
|
|
FATAL("unable to ungetc '%c'", buf[k]);
|
|
while (k > i + patlen);
|
|
buf[k] = '\0';
|
|
return true;
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
|
|
Node *reparse(const char *p) /* parses regular expression pointed to by p */
|
|
{ /* uses relex() to scan regular expression */
|
|
Node *np;
|
|
|
|
DPRINTF("reparse <%s>\n", p);
|
|
lastre = prestr = (const uschar *) p; /* prestr points to string to be parsed */
|
|
rtok = relex();
|
|
/* GNU compatibility: an empty regexp matches anything */
|
|
if (rtok == '\0') {
|
|
/* FATAL("empty regular expression"); previous */
|
|
return(op2(EMPTYRE, NIL, NIL));
|
|
}
|
|
np = regexp();
|
|
if (rtok != '\0')
|
|
FATAL("syntax error in regular expression %s at %s", lastre, prestr);
|
|
return(np);
|
|
}
|
|
|
|
Node *regexp(void) /* top-level parse of reg expr */
|
|
{
|
|
return (alt(concat(primary())));
|
|
}
|
|
|
|
Node *primary(void)
|
|
{
|
|
Node *np;
|
|
int savelastatom;
|
|
|
|
switch (rtok) {
|
|
case CHAR:
|
|
lastatom = starttok;
|
|
np = op2(CHAR, NIL, itonp(rlxval));
|
|
rtok = relex();
|
|
return (unary(np));
|
|
case ALL:
|
|
rtok = relex();
|
|
return (unary(op2(ALL, NIL, NIL)));
|
|
case EMPTYRE:
|
|
rtok = relex();
|
|
return (unary(op2(EMPTYRE, NIL, NIL)));
|
|
case DOT:
|
|
lastatom = starttok;
|
|
rtok = relex();
|
|
return (unary(op2(DOT, NIL, NIL)));
|
|
case CCL:
|
|
np = op2(CCL, NIL, (Node*) cclenter((const char *) rlxstr));
|
|
lastatom = starttok;
|
|
rtok = relex();
|
|
return (unary(np));
|
|
case NCCL:
|
|
np = op2(NCCL, NIL, (Node *) cclenter((const char *) rlxstr));
|
|
lastatom = starttok;
|
|
rtok = relex();
|
|
return (unary(np));
|
|
case '^':
|
|
rtok = relex();
|
|
return (unary(op2(CHAR, NIL, itonp(HAT))));
|
|
case '$':
|
|
rtok = relex();
|
|
return (unary(op2(CHAR, NIL, NIL)));
|
|
case '(':
|
|
lastatom = starttok;
|
|
savelastatom = starttok - basestr; /* Retain over recursion */
|
|
rtok = relex();
|
|
if (rtok == ')') { /* special pleading for () */
|
|
rtok = relex();
|
|
return unary(op2(CCL, NIL, (Node *) tostring("")));
|
|
}
|
|
np = regexp();
|
|
if (rtok == ')') {
|
|
lastatom = basestr + savelastatom; /* Restore */
|
|
rtok = relex();
|
|
return (unary(np));
|
|
}
|
|
else
|
|
FATAL("syntax error in regular expression %s at %s", lastre, prestr);
|
|
default:
|
|
FATAL("illegal primary in regular expression %s at %s", lastre, prestr);
|
|
}
|
|
return 0; /*NOTREACHED*/
|
|
}
|
|
|
|
Node *concat(Node *np)
|
|
{
|
|
switch (rtok) {
|
|
case CHAR: case DOT: case ALL: case CCL: case NCCL: case '$': case '(':
|
|
return (concat(op2(CAT, np, primary())));
|
|
case EMPTYRE:
|
|
rtok = relex();
|
|
return (concat(op2(CAT, op2(CCL, NIL, (Node *) tostring("")),
|
|
primary())));
|
|
}
|
|
return (np);
|
|
}
|
|
|
|
Node *alt(Node *np)
|
|
{
|
|
if (rtok == OR) {
|
|
rtok = relex();
|
|
return (alt(op2(OR, np, concat(primary()))));
|
|
}
|
|
return (np);
|
|
}
|
|
|
|
Node *unary(Node *np)
|
|
{
|
|
switch (rtok) {
|
|
case STAR:
|
|
rtok = relex();
|
|
return (unary(op2(STAR, np, NIL)));
|
|
case PLUS:
|
|
rtok = relex();
|
|
return (unary(op2(PLUS, np, NIL)));
|
|
case QUEST:
|
|
rtok = relex();
|
|
return (unary(op2(QUEST, np, NIL)));
|
|
case ZERO:
|
|
rtok = relex();
|
|
return (unary(op2(ZERO, np, NIL)));
|
|
default:
|
|
return (np);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Character class definitions conformant to the POSIX locale as
|
|
* defined in IEEE P1003.1 draft 7 of June 2001, assuming the source
|
|
* and operating character sets are both ASCII (ISO646) or supersets
|
|
* thereof.
|
|
*
|
|
* Note that to avoid overflowing the temporary buffer used in
|
|
* relex(), the expanded character class (prior to range expansion)
|
|
* must be less than twice the size of their full name.
|
|
*/
|
|
|
|
/* Because isblank doesn't show up in any of the header files on any
|
|
* system i use, it's defined here. if some other locale has a richer
|
|
* definition of "blank", define HAS_ISBLANK and provide your own
|
|
* version.
|
|
* the parentheses here are an attempt to find a path through the maze
|
|
* of macro definition and/or function and/or version provided. thanks
|
|
* to nelson beebe for the suggestion; let's see if it works everywhere.
|
|
*/
|
|
|
|
/* #define HAS_ISBLANK */
|
|
#ifndef HAS_ISBLANK
|
|
|
|
int (xisblank)(int c)
|
|
{
|
|
return c==' ' || c=='\t';
|
|
}
|
|
|
|
#endif
|
|
|
|
static const struct charclass {
|
|
const char *cc_name;
|
|
int cc_namelen;
|
|
int (*cc_func)(int);
|
|
} charclasses[] = {
|
|
{ "alnum", 5, isalnum },
|
|
{ "alpha", 5, isalpha },
|
|
#ifndef HAS_ISBLANK
|
|
{ "blank", 5, xisblank },
|
|
#else
|
|
{ "blank", 5, isblank },
|
|
#endif
|
|
{ "cntrl", 5, iscntrl },
|
|
{ "digit", 5, isdigit },
|
|
{ "graph", 5, isgraph },
|
|
{ "lower", 5, islower },
|
|
{ "print", 5, isprint },
|
|
{ "punct", 5, ispunct },
|
|
{ "space", 5, isspace },
|
|
{ "upper", 5, isupper },
|
|
{ "xdigit", 6, isxdigit },
|
|
{ NULL, 0, NULL },
|
|
};
|
|
|
|
#define REPEAT_SIMPLE 0
|
|
#define REPEAT_PLUS_APPENDED 1
|
|
#define REPEAT_WITH_Q 2
|
|
#define REPEAT_ZERO 3
|
|
|
|
static int
|
|
replace_repeat(const uschar *reptok, int reptoklen, const uschar *atom,
|
|
int atomlen, int firstnum, int secondnum, int special_case)
|
|
{
|
|
int i, j;
|
|
uschar *buf = 0;
|
|
int ret = 1;
|
|
int init_q = (firstnum == 0); /* first added char will be ? */
|
|
int n_q_reps = secondnum-firstnum; /* m>n, so reduce until {1,m-n} left */
|
|
int prefix_length = reptok - basestr; /* prefix includes first rep */
|
|
int suffix_length = strlen((const char *) reptok) - reptoklen; /* string after rep specifier */
|
|
int size = prefix_length + suffix_length;
|
|
|
|
if (firstnum > 1) { /* add room for reps 2 through firstnum */
|
|
size += atomlen*(firstnum-1);
|
|
}
|
|
|
|
/* Adjust size of buffer for special cases */
|
|
if (special_case == REPEAT_PLUS_APPENDED) {
|
|
size++; /* for the final + */
|
|
} else if (special_case == REPEAT_WITH_Q) {
|
|
size += init_q + (atomlen+1)* n_q_reps;
|
|
} else if (special_case == REPEAT_ZERO) {
|
|
size += 2; /* just a null ERE: () */
|
|
}
|
|
if ((buf = (uschar *) malloc(size + 1)) == NULL)
|
|
FATAL("out of space in reg expr %.10s..", lastre);
|
|
memcpy(buf, basestr, prefix_length); /* copy prefix */
|
|
j = prefix_length;
|
|
if (special_case == REPEAT_ZERO) {
|
|
j -= atomlen;
|
|
buf[j++] = '(';
|
|
buf[j++] = ')';
|
|
}
|
|
for (i = 1; i < firstnum; i++) { /* copy x reps */
|
|
memcpy(&buf[j], atom, atomlen);
|
|
j += atomlen;
|
|
}
|
|
if (special_case == REPEAT_PLUS_APPENDED) {
|
|
buf[j++] = '+';
|
|
} else if (special_case == REPEAT_WITH_Q) {
|
|
if (init_q)
|
|
buf[j++] = '?';
|
|
for (i = init_q; i < n_q_reps; i++) { /* copy x? reps */
|
|
memcpy(&buf[j], atom, atomlen);
|
|
j += atomlen;
|
|
buf[j++] = '?';
|
|
}
|
|
}
|
|
memcpy(&buf[j], reptok+reptoklen, suffix_length);
|
|
if (special_case == REPEAT_ZERO) {
|
|
buf[j+suffix_length] = '\0';
|
|
} else {
|
|
buf[size] = '\0';
|
|
}
|
|
/* free old basestr */
|
|
if (firstbasestr != basestr) {
|
|
if (basestr)
|
|
xfree(basestr);
|
|
}
|
|
basestr = buf;
|
|
prestr = buf + prefix_length;
|
|
if (special_case == REPEAT_ZERO) {
|
|
prestr -= atomlen;
|
|
ret++;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int repeat(const uschar *reptok, int reptoklen, const uschar *atom,
|
|
int atomlen, int firstnum, int secondnum)
|
|
{
|
|
/*
|
|
In general, the repetition specifier or "bound" is replaced here
|
|
by an equivalent ERE string, repeating the immediately previous atom
|
|
and appending ? and + as needed. Note that the first copy of the
|
|
atom is left in place, except in the special_case of a zero-repeat
|
|
(i.e., {0}).
|
|
*/
|
|
if (secondnum < 0) { /* means {n,} -> repeat n-1 times followed by PLUS */
|
|
if (firstnum < 2) {
|
|
/* 0 or 1: should be handled before you get here */
|
|
FATAL("internal error");
|
|
} else {
|
|
return replace_repeat(reptok, reptoklen, atom, atomlen,
|
|
firstnum, secondnum, REPEAT_PLUS_APPENDED);
|
|
}
|
|
} else if (firstnum == secondnum) { /* {n} or {n,n} -> simply repeat n-1 times */
|
|
if (firstnum == 0) { /* {0} or {0,0} */
|
|
/* This case is unusual because the resulting
|
|
replacement string might actually be SMALLER than
|
|
the original ERE */
|
|
return replace_repeat(reptok, reptoklen, atom, atomlen,
|
|
firstnum, secondnum, REPEAT_ZERO);
|
|
} else { /* (firstnum >= 1) */
|
|
return replace_repeat(reptok, reptoklen, atom, atomlen,
|
|
firstnum, secondnum, REPEAT_SIMPLE);
|
|
}
|
|
} else if (firstnum < secondnum) { /* {n,m} -> repeat n-1 times then alternate */
|
|
/* x{n,m} => xx...x{1, m-n+1} => xx...x?x?x?..x? */
|
|
return replace_repeat(reptok, reptoklen, atom, atomlen,
|
|
firstnum, secondnum, REPEAT_WITH_Q);
|
|
} else { /* Error - shouldn't be here (n>m) */
|
|
FATAL("internal error");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int relex(void) /* lexical analyzer for reparse */
|
|
{
|
|
int c, n;
|
|
int cflag;
|
|
static uschar *buf = NULL;
|
|
static int bufsz = 100;
|
|
uschar *bp;
|
|
const struct charclass *cc;
|
|
int i;
|
|
int num, m;
|
|
bool commafound, digitfound;
|
|
const uschar *startreptok;
|
|
static int parens = 0;
|
|
|
|
rescan:
|
|
starttok = prestr;
|
|
|
|
switch (c = *prestr++) {
|
|
case '|': return OR;
|
|
case '*': return STAR;
|
|
case '+': return PLUS;
|
|
case '?': return QUEST;
|
|
case '.': return DOT;
|
|
case '\0': prestr--; return '\0';
|
|
case '^':
|
|
case '$':
|
|
return c;
|
|
case '(':
|
|
parens++;
|
|
return c;
|
|
case ')':
|
|
if (parens) {
|
|
parens--;
|
|
return c;
|
|
}
|
|
/* unmatched close parenthesis; per POSIX, treat as literal */
|
|
rlxval = c;
|
|
return CHAR;
|
|
case '\\':
|
|
rlxval = quoted(&prestr);
|
|
return CHAR;
|
|
default:
|
|
rlxval = c;
|
|
return CHAR;
|
|
case '[':
|
|
if (buf == NULL && (buf = (uschar *) malloc(bufsz)) == NULL)
|
|
FATAL("out of space in reg expr %.10s..", lastre);
|
|
bp = buf;
|
|
if (*prestr == '^') {
|
|
cflag = 1;
|
|
prestr++;
|
|
}
|
|
else
|
|
cflag = 0;
|
|
n = 2 * strlen((const char *) prestr)+1;
|
|
if (!adjbuf((char **) &buf, &bufsz, n, n, (char **) &bp, "relex1"))
|
|
FATAL("out of space for reg expr %.10s...", lastre);
|
|
for (; ; ) {
|
|
if ((c = *prestr++) == '\\') {
|
|
*bp++ = '\\';
|
|
if ((c = *prestr++) == '\0')
|
|
FATAL("nonterminated character class %.20s...", lastre);
|
|
*bp++ = c;
|
|
/* } else if (c == '\n') { */
|
|
/* FATAL("newline in character class %.20s...", lastre); */
|
|
} else if (c == '[' && *prestr == ':') {
|
|
/* POSIX char class names, Dag-Erling Smorgrav, des@ofug.org */
|
|
for (cc = charclasses; cc->cc_name; cc++)
|
|
if (strncmp((const char *) prestr + 1, (const char *) cc->cc_name, cc->cc_namelen) == 0)
|
|
break;
|
|
if (cc->cc_name != NULL && prestr[1 + cc->cc_namelen] == ':' &&
|
|
prestr[2 + cc->cc_namelen] == ']') {
|
|
prestr += cc->cc_namelen + 3;
|
|
/*
|
|
* BUG: We begin at 1, instead of 0, since we
|
|
* would otherwise prematurely terminate the
|
|
* string for classes like [[:cntrl:]]. This
|
|
* means that we can't match the NUL character,
|
|
* not without first adapting the entire
|
|
* program to track each string's length.
|
|
*/
|
|
for (i = 1; i <= UCHAR_MAX; i++) {
|
|
if (!adjbuf((char **) &buf, &bufsz, bp-buf+1, 100, (char **) &bp, "relex2"))
|
|
FATAL("out of space for reg expr %.10s...", lastre);
|
|
if (cc->cc_func(i)) {
|
|
/* escape backslash */
|
|
if (i == '\\') {
|
|
*bp++ = '\\';
|
|
n++;
|
|
}
|
|
|
|
*bp++ = i;
|
|
n++;
|
|
}
|
|
}
|
|
} else
|
|
*bp++ = c;
|
|
} else if (c == '[' && *prestr == '.') {
|
|
char collate_char;
|
|
prestr++;
|
|
collate_char = *prestr++;
|
|
if (*prestr == '.' && prestr[1] == ']') {
|
|
prestr += 2;
|
|
/* Found it: map via locale TBD: for
|
|
now, simply return this char. This
|
|
is sufficient to pass conformance
|
|
test awk.ex 156
|
|
*/
|
|
if (*prestr == ']') {
|
|
prestr++;
|
|
rlxval = collate_char;
|
|
return CHAR;
|
|
}
|
|
}
|
|
} else if (c == '[' && *prestr == '=') {
|
|
char equiv_char;
|
|
prestr++;
|
|
equiv_char = *prestr++;
|
|
if (*prestr == '=' && prestr[1] == ']') {
|
|
prestr += 2;
|
|
/* Found it: map via locale TBD: for now
|
|
simply return this char. This is
|
|
sufficient to pass conformance test
|
|
awk.ex 156
|
|
*/
|
|
if (*prestr == ']') {
|
|
prestr++;
|
|
rlxval = equiv_char;
|
|
return CHAR;
|
|
}
|
|
}
|
|
} else if (c == '\0') {
|
|
FATAL("nonterminated character class %.20s", lastre);
|
|
} else if (bp == buf) { /* 1st char is special */
|
|
*bp++ = c;
|
|
} else if (c == ']') {
|
|
*bp++ = 0;
|
|
rlxstr = (uschar *) tostring((char *) buf);
|
|
if (cflag == 0)
|
|
return CCL;
|
|
else
|
|
return NCCL;
|
|
} else
|
|
*bp++ = c;
|
|
}
|
|
break;
|
|
case '{':
|
|
if (isdigit(*(prestr))) {
|
|
num = 0; /* Process as a repetition */
|
|
n = -1; m = -1;
|
|
commafound = false;
|
|
digitfound = false;
|
|
startreptok = prestr-1;
|
|
/* Remember start of previous atom here ? */
|
|
} else { /* just a { char, not a repetition */
|
|
rlxval = c;
|
|
return CHAR;
|
|
}
|
|
for (; ; ) {
|
|
if ((c = *prestr++) == '}') {
|
|
if (commafound) {
|
|
if (digitfound) { /* {n,m} */
|
|
m = num;
|
|
if (m < n)
|
|
FATAL("illegal repetition expression: class %.20s",
|
|
lastre);
|
|
if (n == 0 && m == 1) {
|
|
return QUEST;
|
|
}
|
|
} else { /* {n,} */
|
|
if (n == 0)
|
|
return STAR;
|
|
else if (n == 1)
|
|
return PLUS;
|
|
}
|
|
} else {
|
|
if (digitfound) { /* {n} same as {n,n} */
|
|
n = num;
|
|
m = num;
|
|
} else { /* {} */
|
|
FATAL("illegal repetition expression: class %.20s",
|
|
lastre);
|
|
}
|
|
}
|
|
if (repeat(starttok, prestr-starttok, lastatom,
|
|
startreptok - lastatom, n, m) > 0) {
|
|
if (n == 0 && m == 0) {
|
|
return ZERO;
|
|
}
|
|
/* must rescan input for next token */
|
|
goto rescan;
|
|
}
|
|
/* Failed to replace: eat up {...} characters
|
|
and treat like just PLUS */
|
|
return PLUS;
|
|
} else if (c == '\0') {
|
|
FATAL("nonterminated character class %.20s",
|
|
lastre);
|
|
} else if (isdigit(c)) {
|
|
num = 10 * num + c - '0';
|
|
digitfound = true;
|
|
} else if (c == ',') {
|
|
if (commafound)
|
|
FATAL("illegal repetition expression: class %.20s",
|
|
lastre);
|
|
/* looking for {n,} or {n,m} */
|
|
commafound = true;
|
|
n = num;
|
|
digitfound = false; /* reset */
|
|
num = 0;
|
|
} else {
|
|
FATAL("illegal repetition expression: class %.20s",
|
|
lastre);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
int cgoto(fa *f, int s, int c)
|
|
{
|
|
int *p, *q;
|
|
int i, j, k;
|
|
|
|
assert(c == HAT || c < NCHARS);
|
|
while (f->accept >= maxsetvec) { /* guessing here! */
|
|
resizesetvec(__func__);
|
|
}
|
|
for (i = 0; i <= f->accept; i++)
|
|
setvec[i] = 0;
|
|
setcnt = 0;
|
|
resize_state(f, s);
|
|
/* compute positions of gototab[s,c] into setvec */
|
|
p = f->posns[s];
|
|
for (i = 1; i <= *p; i++) {
|
|
if ((k = f->re[p[i]].ltype) != FINAL) {
|
|
if ((k == CHAR && c == ptoi(f->re[p[i]].lval.np))
|
|
|| (k == DOT && c != 0 && c != HAT)
|
|
|| (k == ALL && c != 0)
|
|
|| (k == EMPTYRE && c != 0)
|
|
|| (k == CCL && member(c, (char *) f->re[p[i]].lval.up))
|
|
|| (k == NCCL && !member(c, (char *) f->re[p[i]].lval.up) && c != 0 && c != HAT)) {
|
|
q = f->re[p[i]].lfollow;
|
|
for (j = 1; j <= *q; j++) {
|
|
if (q[j] >= maxsetvec) {
|
|
resizesetvec(__func__);
|
|
}
|
|
if (setvec[q[j]] == 0) {
|
|
setcnt++;
|
|
setvec[q[j]] = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* determine if setvec is a previous state */
|
|
tmpset[0] = setcnt;
|
|
j = 1;
|
|
for (i = f->accept; i >= 0; i--)
|
|
if (setvec[i]) {
|
|
tmpset[j++] = i;
|
|
}
|
|
resize_state(f, f->curstat > s ? f->curstat : s);
|
|
/* tmpset == previous state? */
|
|
for (i = 1; i <= f->curstat; i++) {
|
|
p = f->posns[i];
|
|
if ((k = tmpset[0]) != p[0])
|
|
goto different;
|
|
for (j = 1; j <= k; j++)
|
|
if (tmpset[j] != p[j])
|
|
goto different;
|
|
/* setvec is state i */
|
|
if (c != HAT)
|
|
f->gototab[s][c] = i;
|
|
return i;
|
|
different:;
|
|
}
|
|
|
|
/* add tmpset to current set of states */
|
|
++(f->curstat);
|
|
resize_state(f, f->curstat);
|
|
for (i = 0; i < NCHARS; i++)
|
|
f->gototab[f->curstat][i] = 0;
|
|
xfree(f->posns[f->curstat]);
|
|
p = intalloc(setcnt + 1, __func__);
|
|
|
|
f->posns[f->curstat] = p;
|
|
if (c != HAT)
|
|
f->gototab[s][c] = f->curstat;
|
|
for (i = 0; i <= setcnt; i++)
|
|
p[i] = tmpset[i];
|
|
if (setvec[f->accept])
|
|
f->out[f->curstat] = 1;
|
|
else
|
|
f->out[f->curstat] = 0;
|
|
return f->curstat;
|
|
}
|
|
|
|
|
|
void freefa(fa *f) /* free a finite automaton */
|
|
{
|
|
int i;
|
|
|
|
if (f == NULL)
|
|
return;
|
|
for (i = 0; i < f->state_count; i++)
|
|
xfree(f->gototab[i])
|
|
for (i = 0; i <= f->curstat; i++)
|
|
xfree(f->posns[i]);
|
|
for (i = 0; i <= f->accept; i++) {
|
|
xfree(f->re[i].lfollow);
|
|
if (f->re[i].ltype == CCL || f->re[i].ltype == NCCL)
|
|
xfree(f->re[i].lval.np);
|
|
}
|
|
xfree(f->restr);
|
|
xfree(f->out);
|
|
xfree(f->posns);
|
|
xfree(f->gototab);
|
|
xfree(f);
|
|
}
|