Commit message: Bug#20642505: HENRY SPENCER REGULAR EXPRESSIONS (REGEX) LIBRARY

The MySQL server uses Henry Spencer's library for regular
expressions to support the REGEXP/RLIKE string operator.
This changeset adapts a recent fix from the upstream for
better 32-bit compatiblity. (Note that we cannot simply use
the current upstream version as a drop-in replacement
for the version used by the server as the latter has
been extended to understand MySQL charsets etc.)
CVE: CVE-2015-2305
CWE: CWE-190
Vulnerability description: Integer overflow in the regcomp implementation in the Henry Spencer BSD regex library (aka rxspencer) alpha3.8.g5 on 32-bit platforms, as used in NetBSD through 6.1.5 and other products, might allow context-dependent attackers to execute arbitrary code via a large regular expression that leads to a heap-based buffer overflow.

Project: mysql-server
File: regcomp.c

enlarge(p, size)
register struct parse *p;
register sopno size;
{
	register sop *sp;

	if (p->ssize >= size)
		return;

	sp = (sop *)realloc(p->strip, size*sizeof(sop));
	if (sp == NULL) {
		SETERROR(REG_ESPACE);
		return;
	}
	p->strip = sp;
	p->ssize = size;
}

Project: mysql-server
File: regcomp.c

categorize(p, g)
struct parse *p;
register struct re_guts *g;
{
	register cat_t *cats = g->categories;
	register int c;
	register int c2;
	register cat_t cat;

	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	for (c = CHAR_MIN; c <= CHAR_MAX; c++)
		if (cats[c] == 0 && isinsets(g, c)) {
			cat = g->ncategories++;
			cats[c] = cat;
			for (c2 = c+1; c2 <= CHAR_MAX; c2++)
				if (cats[c2] == 0 && samesets(g, c, c2))
					cats[c2] = cat;
		}
}

Project: mysql-server
File: regcomp.c

p_b_coll_elem(p, endc)
register struct parse *p;
int endc;			/* name ended by endc,']' */
{
	register char *sp = p->next;
	register struct cname *cp;
#ifdef _WIN64
	register __int64 len;
#else
	register int len;
#endif
	while (MORE() && !SEETWO(endc, ']'))
		NEXT();
	if (!MORE()) {
		SETERROR(REG_EBRACK);
		return(0);
	}
	len = p->next - sp;
	for (cp = cnames; cp->name != NULL; cp++)
		if (strncmp(cp->name, sp, len) == 0 && cp->name[len] == '\0')
			return(cp->code);	/* known name */
	if (len == 1)
		return(*sp);	/* single character */
	SETERROR(REG_ECOLLATE);			/* neither */
	return(0);
}

Project: mysql-server
File: regcomp.c

p_b_eclass(p, cs)
register struct parse *p;
register cset *cs;
{
	register char c;

	c = p_b_coll_elem(p, '=');
	CHadd(cs, c);
}

Project: mysql-server
File: regcomp.c

freeset(p, cs)
register struct parse *p;
register cset *cs;
{
	register size_t i;
	register cset *top = &p->g->sets[p->g->ncsets];
	register size_t css = (size_t)p->g->csetsize;

	for (i = 0; i < css; i++)
	  CHsub(cs, i);
	if (cs == top-1)	/* recover only the easy case */
	  p->g->ncsets--;
}

Project: mysql-server
File: regcomp.c

dofwd(p, pos, value)
register struct parse *p;
register sopno pos;
sop value;
{
	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	assert(value < 1<<OPSHIFT);
	p->strip[pos] = OP(p->strip[pos]) | value;
}

Project: mysql-server
File: regcomp.c

doinsert(p, op, opnd, pos)
register struct parse *p;
sop op;
size_t opnd;
sopno pos;
{
	register sopno sn;
	register sop s;
	register int i;

	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	sn = HERE();
	EMIT(op, opnd);		/* do checks, ensure space */
	assert(HERE() == sn+1);
	s = p->strip[sn];

	/* adjust paren pointers */
	assert(pos > 0);
	for (i = 1; i < NPAREN; i++) {
		if (p->pbegin[i] >= pos) {
			p->pbegin[i]++;
		}
		if (p->pend[i] >= pos) {
			p->pend[i]++;
		}
	}
	{
          int length=(HERE()-pos-1)*sizeof(sop);
          bmove_upp((uchar *) &p->strip[pos+1]+length,
                    (uchar *) &p->strip[pos]+length,
                    length);
        }
#ifdef OLD_CODE
        memmove((char *)&p->strip[pos+1], (char *)&p->strip[pos],
                                                (HERE()-pos-1)*sizeof(sop));
#endif
	p->strip[pos] = s;
}

Project: mysql-server
File: regcomp.c

p_simp_re(p, starordinary)
register struct parse *p;
int starordinary;		/* is a leading * an ordinary character? */
{
	register int c;
	register int count;
	register int count2;
	register sopno pos;
	register int i;
	register sopno subno;
#	define	BACKSL	(1<<CHAR_BIT)

	pos = HERE();		/* repetion op, if any, covers from here */

	assert(MORE());		/* caller should have ensured this */
	c = GETNEXT();
	if (c == '\\') {
		if(REQUIRE(MORE(), REG_EESCAPE)) {}
		c = BACKSL | (unsigned char)GETNEXT();
	}
	switch (c) {
	case '.':
		if (p->g->cflags&REG_NEWLINE)
			nonnewline(p);
		else
			EMIT(OANY, 0);
		break;
	case '[':
		p_bracket(p);
		break;
	case BACKSL|'{':
		SETERROR(REG_BADRPT);
		break;
	case BACKSL|'(':
		p->g->nsub++;
		subno = (sopno) p->g->nsub;
		if (subno < NPAREN)
			p->pbegin[subno] = HERE();
		EMIT(OLPAREN, subno);
		/* the MORE here is an error heuristic */
		if (MORE() && !SEETWO('\\', ')'))
			p_bre(p, '\\', ')');
		if (subno < NPAREN) {
			p->pend[subno] = HERE();
			assert(p->pend[subno] != 0);
		}
		EMIT(ORPAREN, subno);
		if(REQUIRE(EATTWO('\\', ')'), REG_EPAREN)) {}
		break;
	case BACKSL|')':	/* should not get here -- must be user */
	case BACKSL|'}':
		SETERROR(REG_EPAREN);
		break;
	case BACKSL|'1':
	case BACKSL|'2':
	case BACKSL|'3':
	case BACKSL|'4':
	case BACKSL|'5':
	case BACKSL|'6':
	case BACKSL|'7':
	case BACKSL|'8':
	case BACKSL|'9':
		i = (c&~BACKSL) - '0';
		assert(i < NPAREN);
		if (p->pend[i] != 0) {
			assert((uint) i <= p->g->nsub);
			EMIT(OBACK_, i);
			assert(p->pbegin[i] != 0);
			assert(OP(p->strip[p->pbegin[i]]) == OLPAREN);
			assert(OP(p->strip[p->pend[i]]) == ORPAREN);
			(void) dupl(p, p->pbegin[i]+1, p->pend[i]);
			EMIT(O_BACK, i);
		} else
			SETERROR(REG_ESUBREG);
		p->g->backrefs = 1;
		break;
	case '*':
		if(REQUIRE(starordinary, REG_BADRPT)) {}
		/* FALLTHROUGH */
	default:
		ordinary(p, c &~ BACKSL);
		break;
	}

	if (EAT('*')) {		/* implemented as +? */
		/* this case does not require the (y|) trick, noKLUDGE */
		INSERT(OPLUS_, pos);
		ASTERN(O_PLUS, pos);
		INSERT(OQUEST_, pos);
		ASTERN(O_QUEST, pos);
	} else if (EATTWO('\\', '{')) {
		count = p_count(p);
		if (EAT(',')) {
			if (MORE() && my_isdigit(p->charset,PEEK())) {
				count2 = p_count(p);
				if(REQUIRE(count <= count2, REG_BADBR)) {}
			} else		/* single number with comma */
				count2 = RE_INFINITY;
		} else		/* just a single number */
			count2 = count;
		repeat(p, pos, count, count2);
		if (!EATTWO('\\', '}')) {	/* error heuristics */
			while (MORE() && !SEETWO('\\', '}'))
				NEXT();
			if(REQUIRE(MORE(), REG_EBRACE)) {}
			SETERROR(REG_BADBR);
		}
	} else if (c == (unsigned char)'$')	/* $ (but not \$) ends it */
		return(1);

	return(0);
}

Project: mysql-server
File: regcomp.c

mcadd(p, cs, cp)
register struct parse *p;
register cset *cs;
register char *cp;
{
	register size_t oldend = cs->smultis;

	cs->smultis += strlen(cp) + 1;
	if (cs->multis == NULL)
		cs->multis = malloc(cs->smultis);
	else
		cs->multis = realloc(cs->multis, cs->smultis);
	if (cs->multis == NULL) {
		SETERROR(REG_ESPACE);
		return;
	}

	(void) strcpy(cs->multis + oldend - 1, cp);
	cs->multis[cs->smultis - 1] = '\0';
}

Project: mysql-server
File: regcomp.c

stripsnug(p, g)
register struct parse *p;
register struct re_guts *g;
{
	g->nstates = p->slen;
	g->strip = (sop *)realloc((char *)p->strip, p->slen * sizeof(sop));
	if (g->strip == NULL) {
		SETERROR(REG_ESPACE);
		g->strip = p->strip;
	}
}

Project: mysql-server
File: regcomp.c

allocset(p)
register struct parse *p;
{
	register int no = p->g->ncsets++;
	register size_t nc;
	register size_t nbytes;
	register cset *cs;
	register size_t css = (size_t)p->g->csetsize;
	register int i;

	if (no >= p->ncsalloc) {	/* need another column of space */
		p->ncsalloc += CHAR_BIT;
		nc = p->ncsalloc;
		assert(nc % CHAR_BIT == 0);
		nbytes = nc / CHAR_BIT * css;
		if (p->g->sets == NULL)
			p->g->sets = (cset *)malloc(nc * sizeof(cset));
		else
			p->g->sets = (cset *)realloc((char *)p->g->sets,
							nc * sizeof(cset));
		if (p->g->setbits == NULL)
			p->g->setbits = (uch *)malloc(nbytes);
		else {
			p->g->setbits = (uch *)realloc((char *)p->g->setbits,
								nbytes);
			/* xxx this isn't right if setbits is now NULL */
			for (i = 0; i < no; i++)
				p->g->sets[i].ptr = p->g->setbits + css*(i/CHAR_BIT);
		}
		if (p->g->sets != NULL && p->g->setbits != NULL)
			(void) memset((char *)p->g->setbits + (nbytes - css),
								0, css);
		else {
			no = 0;
			SETERROR(REG_ESPACE);
			/* caller's responsibility not to do set ops */
		}
	}

	assert(p->g->sets != NULL);	/* xxx */
	cs = &p->g->sets[no];
	cs->ptr = p->g->setbits + css*((no)/CHAR_BIT);
	cs->mask = 1 << ((no) % CHAR_BIT);
	cs->hash = 0;
	cs->smultis = 0;
	cs->multis = NULL;

	return(cs);
}

Project: mysql-server
File: regcomp.c

othercase(charset,ch)
CHARSET_INFO *charset;
int ch;
{
	/*
	  In MySQL some multi-byte character sets
	  have 'ctype' array but don't have 'to_lower'
	  and 'to_upper' arrays. In this case we handle
	  only basic latin letters a..z and A..Z.
	  
	  If 'to_lower' and 'to_upper' arrays are empty in a character set,
	  then my_isalpha(cs, ch) should never return TRUE for characters
	  other than basic latin letters. Otherwise it should be
	  considered as a mistake in character set definition.
	*/
	assert(my_isalpha(charset,ch));
	if (my_isupper(charset,ch))
	{
		return(charset->to_lower ? my_tolower(charset,ch) :
		                          ch - 'A' + 'a');
	}
	else if (my_islower(charset,ch))
	{
		return(charset->to_upper ? my_toupper(charset,ch) :
		                          ch - 'a' + 'A');
	}
	else			/* peculiar, but could happen */
		return(ch);
}

Project: mysql-server
File: regcomp.c

bothcases(p, ch)
register struct parse *p;
int ch;
{
	register char *oldnext = p->next;
	register char *oldend = p->end;
	char bracket[3];

	assert(othercase(p->charset, ch) != ch); /* p_bracket() would recurse */
	p->next = bracket;
	p->end = bracket+2;
	bracket[0] = ch;
	bracket[1] = ']';
	bracket[2] = '\0';
	p_bracket(p);
	assert(p->next == bracket+2);
	p->next = oldnext;
	p->end = oldend;
}

Project: mysql-server
File: regcomp.c

nonnewline(p)
register struct parse *p;
{
	register char *oldnext = p->next;
	register char *oldend = p->end;
	char bracket[4];

	p->next = bracket;
	p->end = bracket+3;
	bracket[0] = '^';
	bracket[1] = '\n';
	bracket[2] = ']';
	bracket[3] = '\0';
	p_bracket(p);
	assert(p->next == bracket+3);
	p->next = oldnext;
	p->end = oldend;
}

Project: mysql-server
File: regcomp.c

dupl(p, start, finish)
register struct parse *p;
sopno start;			/* from here */
sopno finish;			/* to this less one */
{
	register sopno ret = HERE();
	register sopno len = finish - start;

	assert(finish >= start);
	if (len == 0)
		return(ret);
	enlarge(p, p->ssize + len);	/* this many unexpected additions */
	assert(p->ssize >= p->slen + len);
	(void) memcpy((char *)(p->strip + p->slen),
		(char *)(p->strip + start), (size_t)len*sizeof(sop));
	p->slen += len;
	return(ret);
}

Project: mysql-server
File: regcomp.c

samesets(g, c1, c2)
register struct re_guts *g;
int c1;
int c2;
{
	register uch *col;
	register int i;
	register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
	register unsigned uc1 = (unsigned char)c1;
	register unsigned uc2 = (unsigned char)c2;

	for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize)
		if (col[uc1] != col[uc2])
			return(0);
	return(1);
}

Project: mysql-server
File: regcomp.c

p_b_symbol(p)
register struct parse *p;
{
	register char value;

	if(REQUIRE(MORE(), REG_EBRACK)) {}
	if (!EATTWO('[', '.'))
		return(GETNEXT());

	/* collating symbol */
	value = p_b_coll_elem(p, '.');
	if(REQUIRE(EATTWO('.', ']'), REG_ECOLLATE)) {}
	return(value);
}

Project: mysql-server
File: regcomp.c

nch(p, cs)
register struct parse *p;
register cset *cs;
{
	register size_t i;
	register size_t css = (size_t)p->g->csetsize;
	register int n = 0;

	for (i = 0; i < css; i++)
		if (CHIN(cs, i))
			n++;
	return(n);
}

Project: mysql-server
File: regcomp.c

p_bracket(p)
register struct parse *p;
{
	register cset *cs = allocset(p);
	register int invert = 0;

	/* Dept of Truly Sickening Special-Case Kludges */
	if (p->next + 5 < p->end && strncmp(p->next, "[:<:]]", 6) == 0) {
		EMIT(OBOW, 0);
		NEXTn(6);
		return;
	}
	if (p->next + 5 < p->end && strncmp(p->next, "[:>:]]", 6) == 0) {
		EMIT(OEOW, 0);
		NEXTn(6);
		return;
	}

	if (EAT('^'))
		invert++;	/* make note to invert set at end */
	if (EAT(']'))
		CHadd(cs, ']');
	else if (EAT('-'))
		CHadd(cs, '-');
	while (MORE() && PEEK() != ']' && !SEETWO('-', ']'))
		p_b_term(p, cs);
	if (EAT('-'))
		CHadd(cs, '-');
	if(MUSTEAT(']', REG_EBRACK)) {}

	if (p->error != 0)	/* don't mess things up further */
		return;

	if (p->g->cflags&REG_ICASE) {
		register int i;
		register int ci;

		for (i = p->g->csetsize - 1; i >= 0; i--)
			if (CHIN(cs, i) && my_isalpha(p->charset,i)) {
				ci = othercase(p->charset,i);
				if (ci != i)
					CHadd(cs, ci);
			}
		if (cs->multis != NULL)
			mccase(p, cs);
	}
	if (invert) {
		register int i;

		for (i = p->g->csetsize - 1; i >= 0; i--)
			if (CHIN(cs, i))
				CHsub(cs, i);
			else
				CHadd(cs, i);
		if (p->g->cflags&REG_NEWLINE)
			CHsub(cs, '\n');
		if (cs->multis != NULL)
			mcinvert(p, cs);
	}

	assert(cs->multis == NULL);		/* xxx */

	if (nch(p, cs) == 1) {		/* optimize singleton sets */
		ordinary(p, firstch(p, cs));
		freeset(p, cs);
	} else
		EMIT(OANYOF, freezeset(p, cs));
}

Project: mysql-server
File: regcomp.c

p_ere(p, stop)
register struct parse *p;
int stop;			/* character this ERE should end at */
{
	register char c;
	register sopno UNINIT_VAR(prevback);
	register sopno UNINIT_VAR(prevfwd);
	register sopno conc;
	register int first = 1;		/* is this the first alternative? */

	for (;;) {
		/* do a bunch of concatenated expressions */
		conc = HERE();
		while (MORE() && (c = PEEK()) != '|' && c != stop)
		{
		  if (my_regex_enough_mem_in_stack &&
		      my_regex_enough_mem_in_stack(0))
		  {
		    SETERROR(REG_ESPACE);
		    return;
		  }
		  p_ere_exp(p);
		}
		if(REQUIRE(HERE() != conc, REG_EMPTY)) {}/* require nonempty */

		if (!EAT('|'))
			break;		/* NOTE BREAK OUT */

		if (first) {
			INSERT(OCH_, conc);	/* offset is wrong */
			prevfwd = conc;
			prevback = conc;
			first = 0;
		}
		ASTERN(OOR1, prevback);
		prevback = THERE();
		AHEAD(prevfwd);			/* fix previous offset */
		prevfwd = HERE();
		EMIT(OOR2, 0);			/* offset is very wrong */
	}

	if (!first) {		/* tail-end fixups */
		AHEAD(prevfwd);
		ASTERN(O_CH, prevback);
	}

	assert(!MORE() || SEE(stop));
}

Project: mysql-server
File: regcomp.c

pluscount(p, g)
struct parse *p;
register struct re_guts *g;
{
	register sop *scan;
	register sop s;
	register sopno plusnest = 0;
	register sopno maxnest = 0;

	if (p->error != 0)
		return(0);	/* there may not be an OEND */

	scan = g->strip + 1;
	do {
		s = *scan++;
		switch (OP(s)) {
		case OPLUS_:
			plusnest++;
			break;
		case O_PLUS:
			if (plusnest > maxnest)
				maxnest = plusnest;
			plusnest--;
			break;
		}
	} while (OP(s) != OEND);
	if (plusnest != 0)
		g->iflags |= BAD;
	return(maxnest);
}

Project: mysql-server
File: regcomp.c

p_b_cclass(p, cs)
register struct parse *p;
register cset *cs;
{
	register char *sp = p->next;
	register struct cclass *cp;
	register size_t len;
	
	while (MORE() && my_isalpha(p->charset,PEEK()))
		NEXT();
	len = p->next - sp;
	for (cp = cclasses; cp->name != NULL; cp++)
		if (strncmp(cp->name, sp, len) == 0 && cp->name[len] == '\0')
			break;
	if (cp->name == NULL) {
		/* oops, didn't find it */
		SETERROR(REG_ECTYPE);
		return;
	}

#ifndef USE_ORIG_REGEX_CODE
	{
		register size_t i;
		for (i=1 ; i<256 ; i++)
			if (p->charset->ctype[i+1] & cp->mask)
				CHadd(cs, i);
	}
#else	
	{
		register char *u = (char*) cp->chars;
		register char c;
		
		while ((c = *u++) != '\0')
			CHadd(cs, c);
		
		for (u = (char*) cp->multis; *u != '\0'; u += strlen(u) + 1)
			MCadd(p, cs, u);
	}
#endif

}

Project: mysql-server
File: regcomp.c

firstch(p, cs)
register struct parse *p;
register cset *cs;
{
	register size_t i;
	register size_t css = (size_t)p->g->csetsize;

	for (i = 0; i < css; i++)
		if (CHIN(cs, i))
			return((char)i);
	assert(never);
	return(0);		/* arbitrary */
}

Project: mysql-server
File: regcomp.c

p_bre(p, end1, end2)
register struct parse *p;
register int end1;		/* first terminating character */
register int end2;		/* second terminating character */
{
	register sopno start = HERE();
	register int first = 1;			/* first subexpression? */
	register int wasdollar = 0;

	if (EAT('^')) {
		EMIT(OBOL, 0);
		p->g->iflags |= USEBOL;
		p->g->nbol++;
	}
	while (MORE() && !SEETWO(end1, end2)) {
		wasdollar = p_simp_re(p, first);
		first = 0;
	}
	if (wasdollar) {	/* oops, that was a trailing anchor */
		DROP(1);
		EMIT(OEOL, 0);
		p->g->iflags |= USEEOL;
		p->g->neol++;
	}

	if(REQUIRE(HERE() != start, REG_EMPTY)) {}	/* require nonempty */
}

Project: mysql-server
File: regcomp.c

p_count(p)
register struct parse *p;
{
	register int count = 0;
	register int ndigits = 0;

	while (MORE() && my_isdigit(p->charset,PEEK()) && count <= DUPMAX) {
		count = count*10 + (GETNEXT() - '0');
		ndigits++;
	}

	if(REQUIRE(ndigits > 0 && count <= DUPMAX, REG_BADBR)) {}
	return(count);
}

Project: mysql-server
File: regcomp.c

p_b_term(p, cs)
register struct parse *p;
register cset *cs;
{
	register char c;
	register char start, finish;
	register int i;

	/* classify what we've got */
	switch ((MORE()) ? PEEK() : '\0') {
	case '[':
		c = (MORE2()) ? PEEK2() : '\0';
		break;
	case '-':
		SETERROR(REG_ERANGE);
		return;			/* NOTE RETURN */
	default:
		c = '\0';
		break;
	}

	switch (c) {
	case ':':		/* character class */
		NEXT2();
		if(REQUIRE(MORE(), REG_EBRACK)) {}
		c = PEEK();
		if(REQUIRE(c != '-' && c != ']', REG_ECTYPE)) {}
		p_b_cclass(p, cs);
		if(REQUIRE(MORE(), REG_EBRACK)) {}
		if(REQUIRE(EATTWO(':', ']'), REG_ECTYPE)) {}
		break;
	case '=':		/* equivalence class */
		NEXT2();
		if(REQUIRE(MORE(), REG_EBRACK)) {}
		c = PEEK();
		if(REQUIRE(c != '-' && c != ']', REG_ECOLLATE)) {}
		p_b_eclass(p, cs);
		if(REQUIRE(MORE(), REG_EBRACK)) {}
		if(REQUIRE(EATTWO('=', ']'), REG_ECOLLATE)) {}
		break;
	default:		/* symbol, ordinary character, or range */
/* xxx revision needed for multichar stuff */
		start = p_b_symbol(p);
		if (SEE('-') && MORE2() && PEEK2() != ']') {
			/* range */
			NEXT();
			if (EAT('-'))
				finish = '-';
			else
				finish = p_b_symbol(p);
		} else
			finish = start;
/* xxx what about signed chars here... */
		if(REQUIRE(start <= finish, REG_ERANGE)) {}
		for (i = start; i <= finish; i++)
			CHadd(cs, i);
		break;
	}
}

Project: mysql-server
File: regcomp.c

findmust(p, g)
struct parse *p;
register struct re_guts *g;
{
	register sop *scan;
	sop *UNINIT_VAR(start);
	register sop *UNINIT_VAR(newstart);
	register sopno newlen;
	register sop s;
	register char *cp;
	register sopno i;

	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	/* find the longest OCHAR sequence in strip */
	newlen = 0;
	scan = g->strip + 1;
	do {
		s = *scan++;
		switch (OP(s)) {
		case OCHAR:		/* sequence member */
			if (newlen == 0)		/* new sequence */
				newstart = scan - 1;
			newlen++;
			break;
		case OPLUS_:		/* things that don't break one */
		case OLPAREN:
		case ORPAREN:
			break;
		case OQUEST_:		/* things that must be skipped */
		case OCH_:
			scan--;
			do {
				scan += OPND(s);
				s = *scan;
				/* assert() interferes w debug printouts */
				if (OP(s) != O_QUEST && OP(s) != O_CH &&
							OP(s) != OOR2) {
					g->iflags |= BAD;
					return;
				}
			} while (OP(s) != O_QUEST && OP(s) != O_CH);
			/* fallthrough */
		default:		/* things that break a sequence */
			if (newlen > g->mlen) {		/* ends one */
				start = newstart;
				g->mlen = newlen;
			}
			newlen = 0;
			break;
		}
	} while (OP(s) != OEND);

	if (g->mlen == 0)		/* there isn't one */
		return;

	/* turn it into a character string */
	g->must = malloc((size_t)g->mlen + 1);
	if (g->must == NULL) {		/* argh; just forget it */
		g->mlen = 0;
		return;
	}
	cp = g->must;
	scan = start;
	for (i = g->mlen; i > 0; i--) {
		while (OP(s = *scan++) != OCHAR)
			continue;
		assert(cp < g->must + g->mlen);
		*cp++ = (char)OPND(s);
	}
	assert(cp == g->must + g->mlen);
	*cp++ = '\0';		/* just on general principles */
}

Project: mysql-server
File: regcomp.c

p_str(p)
register struct parse *p;
{
	if(REQUIRE(MORE(), REG_EMPTY)) {}
	while (MORE())
		ordinary(p, GETNEXT());
}

Project: mysql-server
File: regcomp.c

repeat(p, start, from, to)
register struct parse *p;
sopno start;			/* operand from here to end of strip */
int from;			/* repeated from this number */
int to;				/* to this number of times (maybe RE_INFINITY) */
{
	register sopno finish = HERE();
#	define	N	2
#	define	INF	3
#	define	REP(f, t)	((f)*8 + (t))
#	define	MAP(n)	(((n) <= 1) ? (n) : ((n) == RE_INFINITY) ? INF : N)
	register sopno copy;

	if (p->error != 0)	/* head off possible runaway recursion */
		return;

	assert(from <= to);

	switch (REP(MAP(from), MAP(to))) {
	case REP(0, 0):			/* must be user doing this */
		DROP(finish-start);	/* drop the operand */
		break;
	case REP(0, 1):			/* as x{1,1}? */
	case REP(0, N):			/* as x{1,n}? */
	case REP(0, INF):		/* as x{1,}? */
		/* KLUDGE: emit y? as (y|) until subtle bug gets fixed */
		INSERT(OCH_, start);		/* offset is wrong... */
		repeat(p, start+1, 1, to);
		ASTERN(OOR1, start);
		AHEAD(start);			/* ... fix it */
		EMIT(OOR2, 0);
		AHEAD(THERE());
		ASTERN(O_CH, THERETHERE());
		break;
	case REP(1, 1):			/* trivial case */
		/* done */
		break;
	case REP(1, N):			/* as x?x{1,n-1} */
		/* KLUDGE: emit y? as (y|) until subtle bug gets fixed */
		INSERT(OCH_, start);
		ASTERN(OOR1, start);
		AHEAD(start);
		EMIT(OOR2, 0);			/* offset very wrong... */
		AHEAD(THERE());			/* ...so fix it */
		ASTERN(O_CH, THERETHERE());
		copy = dupl(p, start+1, finish+1);
		assert(copy == finish+4);
		repeat(p, copy, 1, to-1);
		break;
	case REP(1, INF):		/* as x+ */
		INSERT(OPLUS_, start);
		ASTERN(O_PLUS, start);
		break;
	case REP(N, N):			/* as xx{m-1,n-1} */
		copy = dupl(p, start, finish);
		repeat(p, copy, from-1, to-1);
		break;
	case REP(N, INF):		/* as xx{n-1,INF} */
		copy = dupl(p, start, finish);
		repeat(p, copy, from-1, to);
		break;
	default:			/* "can't happen" */
		SETERROR(REG_ASSERT);	/* just in case */
		break;
	}
}

Project: mysql-server
File: regcomp.c

seterr(p, e)
register struct parse *p;
int e;
{
	if (p->error == 0)	/* keep earliest error condition */
		p->error = e;
	p->next = nuls;		/* try to bring things to a halt */
	p->end = nuls;
	return(0);		/* make the return value well-defined */
}

Project: mysql-server
File: regcomp.c

ordinary(p, ch)
register struct parse *p;
register int ch;
{
	register cat_t *cap = p->g->categories;

	if ((p->g->cflags&REG_ICASE) && my_isalpha(p->charset,ch) && 
	     othercase(p->charset,ch) != ch)
		bothcases(p, ch);
	else {
		EMIT(OCHAR, (unsigned char)ch);
		if (cap[ch] == 0)
			cap[ch] = p->g->ncategories++;
	}
}

Project: mysql-server
File: regcomp.c

my_regcomp(preg, pattern, cflags, charset)
my_regex_t *preg;
const char *pattern;
int cflags;
CHARSET_INFO *charset;
{
	struct parse pa;
	register struct re_guts *g;
	register struct parse *p = &pa;
	register int i;
	register size_t len;
#ifdef REDEBUG
#	define	GOODFLAGS(f)	(f)
#else
#	define	GOODFLAGS(f)	((f)&~REG_DUMP)
#endif

	my_regex_init(charset, NULL);	/* Init cclass if neaded */
	preg->charset=charset;
	cflags = GOODFLAGS(cflags);
	if ((cflags&REG_EXTENDED) && (cflags&REG_NOSPEC))
		return(REG_INVARG);

	if (cflags&REG_PEND) {
		if (preg->re_endp < pattern)
			return(REG_INVARG);
		len = preg->re_endp - pattern;
	} else
		len = strlen((char *)pattern);

	/*
	 Find the maximum len we can safely process
	 without a rollover and a mis-malloc.
	 p->ssize is a sopno is a long (32+ bit signed);
	 size_t is 16+ bit unsigned.
	*/
	{
	  size_t new_ssize = len / (size_t)2 * (size_t)3 + (size_t)1; /* ugh */
	  if ((new_ssize < len) ||	/* size_t rolled over */
	      ((SIZE_T_MAX / sizeof(sop)) < new_ssize) ||	/* malloc arg */
	      (new_ssize > LONG_MAX))	/* won't fit in ssize */
		return(REG_ESPACE);	/* MY_REG_ESPACE or MY_REG_INVARG */
	  p->ssize = new_ssize;
	}

	/* do the mallocs early so failure handling is easy */
	g = (struct re_guts *)malloc(sizeof(struct re_guts) +
							(NC-1)*sizeof(cat_t));
	if (g == NULL)
		return(REG_ESPACE);
	p->strip = (sop *)malloc(p->ssize * sizeof(sop));
	p->slen = 0;
	if (p->strip == NULL) {
		free((char *)g);
		return(REG_ESPACE);
	}

	/* set things up */
	p->g = g;
	p->next = (char *)pattern;	/* convenience; we do not modify it */
	p->end = p->next + len;
	p->error = 0;
	p->ncsalloc = 0;
	p->charset = preg->charset;
	for (i = 0; i < NPAREN; i++) {
		p->pbegin[i] = 0;
		p->pend[i] = 0;
	}
	g->csetsize = NC;
	g->sets = NULL;
	g->setbits = NULL;
	g->ncsets = 0;
	g->cflags = cflags;
	g->iflags = 0;
	g->nbol = 0;
	g->neol = 0;
	g->must = NULL;
	g->mlen = 0;
	g->nsub = 0;
	g->ncategories = 1;	/* category 0 is "everything else" */
	g->categories = &g->catspace[-(CHAR_MIN)];
	(void) memset((char *)g->catspace, 0, NC*sizeof(cat_t));
	g->backrefs = 0;

	/* do it */
	EMIT(OEND, 0);
	g->firststate = THERE();
	if (cflags&REG_EXTENDED)
		p_ere(p, OUT);
	else if (cflags&REG_NOSPEC)
		p_str(p);
	else
		p_bre(p, OUT, OUT);
	EMIT(OEND, 0);
	g->laststate = THERE();

	/* tidy up loose ends and fill things in */
	categorize(p, g);
	stripsnug(p, g);
	findmust(p, g);
	g->nplus = pluscount(p, g);
	g->magic = MAGIC2;
	preg->re_nsub = g->nsub;
	preg->re_g = g;
	preg->re_magic = MAGIC1;
#ifndef REDEBUG
	/* not debugging, so can't rely on the assert() in regexec() */
	if (g->iflags&BAD)
		SETERROR(REG_ASSERT);
#endif

	/* win or lose, we're done */
	if (p->error != 0)	/* lose */
		my_regfree(preg);
	return(p->error);
}

Project: mysql-server
File: regcomp.c

p_ere_exp(p)
register struct parse *p;
{
	register char c;
	register sopno pos;
	register int count;
	register int count2;
	register sopno subno;
	int wascaret = 0;

	assert(MORE());		/* caller should have ensured this */
	c = GETNEXT();

	pos = HERE();
	switch (c) {
	case '(':
		if(REQUIRE(MORE(), REG_EPAREN)) {}
		p->g->nsub++;
		subno = (sopno) p->g->nsub;
		if (subno < NPAREN)
		        p->pbegin[subno] = HERE();
		EMIT(OLPAREN, subno);
		if (!SEE(')'))
			p_ere(p, ')');
		if (subno < NPAREN) {
			p->pend[subno] = HERE();
			assert(p->pend[subno] != 0);
		}
		EMIT(ORPAREN, subno);
		if(MUSTEAT(')', REG_EPAREN)) {}
		break;
	case '^':
		EMIT(OBOL, 0);
		p->g->iflags |= USEBOL;
		p->g->nbol++;
		wascaret = 1;
		break;
	case '$':
		EMIT(OEOL, 0);
		p->g->iflags |= USEEOL;
		p->g->neol++;
		break;
	case '|':
		SETERROR(REG_EMPTY);
		break;
	case '*':
	case '+':
	case '?':
		SETERROR(REG_BADRPT);
		break;
	case '.':
		if (p->g->cflags&REG_NEWLINE)
			nonnewline(p);
		else
			EMIT(OANY, 0);
		break;
	case '[':
		p_bracket(p);
		break;
	case '\\':
		if(REQUIRE(MORE(), REG_EESCAPE)) {}
		c = GETNEXT();
		ordinary(p, c);
		break;
	case '{':		/* okay as ordinary except if digit follows */
		if(REQUIRE(!MORE() || !my_isdigit(p->charset,PEEK()), REG_BADRPT)) {}
		/* FALLTHROUGH */
	default:
		ordinary(p, c);
		break;
	}

	if (!MORE())
		return;
	c = PEEK();
	/* we call { a repetition if followed by a digit */
	if (!( c == '*' || c == '+' || c == '?' ||
				(c == '{' && MORE2() && 
				 my_isdigit(p->charset,PEEK2())) ))
		return;		/* no repetition, we're done */
	NEXT();

	if(REQUIRE(!wascaret, REG_BADRPT)) {}
	switch (c) {
	case '*':	/* implemented as +? */
		/* this case does not require the (y|) trick, noKLUDGE */
		INSERT(OPLUS_, pos);
		ASTERN(O_PLUS, pos);
		INSERT(OQUEST_, pos);
		ASTERN(O_QUEST, pos);
		break;
	case '+':
		INSERT(OPLUS_, pos);
		ASTERN(O_PLUS, pos);
		break;
	case '?':
		/* KLUDGE: emit y? as (y|) until subtle bug gets fixed */
		INSERT(OCH_, pos);		/* offset slightly wrong */
		ASTERN(OOR1, pos);		/* this one's right */
		AHEAD(pos);			/* fix the OCH_ */
		EMIT(OOR2, 0);			/* offset very wrong... */
		AHEAD(THERE());			/* ...so fix it */
		ASTERN(O_CH, THERETHERE());
		break;
	case '{':
		count = p_count(p);
		if (EAT(',')) {
			if (my_isdigit(p->charset,PEEK())) {
				count2 = p_count(p);
				if(REQUIRE(count <= count2, REG_BADBR)) {}
			} else		/* single number with comma */
				count2 = RE_INFINITY;
		} else		/* just a single number */
			count2 = count;
		repeat(p, pos, count, count2);
		if (!EAT('}')) {	/* error heuristics */
			while (MORE() && PEEK() != '}')
				NEXT();
			if(REQUIRE(MORE(), REG_EBRACE)) {}
			SETERROR(REG_BADBR);
		}
		break;
	}

	if (!MORE())
		return;
	c = PEEK();
	if (!( c == '*' || c == '+' || c == '?' ||
				(c == '{' && MORE2() && 
				 my_isdigit(p->charset,PEEK2())) ) )
		return;
	SETERROR(REG_BADRPT);
}

Project: mysql-server
File: regcomp.c

doemit(p, op, opnd)
register struct parse *p;
sop op;
size_t opnd;
{
	/* avoid making error situations worse */
	if (p->error != 0)
		return;

	/* deal with oversize operands ("can't happen", more or less) */
	assert(opnd < 1<<OPSHIFT);

	/* deal with undersized strip */
	if (p->slen >= p->ssize)
		enlarge(p, (p->ssize+1) / 2 * 3);	/* +50% */
	assert(p->slen < p->ssize);

	/* finally, it's all reduced to the easy case */
	p->strip[p->slen++] = SOP(op, opnd);
}

Project: mysql-server
File: regcomp.c

freezeset(p, cs)
register struct parse *p;
register cset *cs;
{
	register uch h = cs->hash;
	register size_t i;
	register cset *top = &p->g->sets[p->g->ncsets];
	register cset *cs2;
	register size_t css = (size_t)p->g->csetsize;

	/* look for an earlier one which is the same */
	for (cs2 = &p->g->sets[0]; cs2 < top; cs2++)
		if (cs2->hash == h && cs2 != cs) {
			/* maybe */
			for (i = 0; i < css; i++)
				if (!!CHIN(cs2, i) != !!CHIN(cs, i))
					break;		/* no */
			if (i == css)
				break;			/* yes */
		}

	if (cs2 < top) {	/* found one */
		freeset(p, cs);
		cs = cs2;
	}

	return((int)(cs - p->g->sets));
}