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regexp core-dump (obs from Ryszard Szopa)

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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@2163 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
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vsc 2008-03-25 11:54:08 +00:00
parent fa73e89807
commit 84c15fda0b
3 changed files with 35 additions and 27 deletions
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14
docs/yap.tex
View File

@ -9813,19 +9813,19 @@ according to options @var{Opts}. The options may be:
be treated as lower case during the matching process.
@end itemize
@item regexp(+@var{RegExp},+@var{String},+@var{Opts},@var{SubMatchVars})
@item regexp(+@var{RegExp},+@var{String},+@var{Opts},?@var{SubMatchVars})
@findex regexp/4
@snindex regexp/4
@cnindex regexp/4
Match regular expression @var{RegExp} to input string @var{String}
according to options @var{Opts}. The variable @var{SubMatchVars} should
be originally a list of unbound variables all will contain a sequence of
matches, that is, the head of @var{SubMatchVars} will contain the
characters in @var{String} that matched the leftmost parenthesized
subexpression within @var{RegExp}, the next head of list will contain
the characters that matched the next parenthesized subexpression to the
right in @var{RegExp}, and so on.
be originally unbound or a list of unbound variables all will contain a
sequence of matches, that is, the head of @var{SubMatchVars} will
contain the characters in @var{String} that matched the leftmost
parenthesized subexpression within @var{RegExp}, the next head of list
will contain the characters that matched the next parenthesized
subexpression to the right in @var{RegExp}, and so on.
The options may be:
@itemize @bullet

29
library/regex/regexp.c
View File

@ -88,12 +88,13 @@ static int regexp(void)
char *buf, *sbuf;
regex_t reg;
int out;
long int nmatch = YAP_IntOfTerm(YAP_ARG7);
size_t nmatch;
regmatch_t *pmatch;
long int tout;
int yap_flags = YAP_IntOfTerm(YAP_ARG5);
int regcomp_flags = REG_EXTENDED;
if ((buf = (char *)YAP_AllocSpaceFromYap(buflen)) == NULL) {
/* early exit */
return(FALSE);
@ -106,8 +107,15 @@ static int regexp(void)
if (yap_flags & 1)
regcomp_flags |= REG_ICASE;
/* cool, now I have my string in the buffer, let's have some fun */
if (yap_regcomp(&reg,buf, regcomp_flags) != 0)
if (yap_regcomp(&reg,buf, regcomp_flags) != 0) {
YAP_FreeSpaceFromYap(buf);
return(FALSE);
}
if (YAP_IsVarTerm(YAP_ARG7)) {
nmatch = reg.re_nsub;
} else {
nmatch = YAP_IntOfTerm(YAP_ARG7);
}
if ((sbuf = (char *)YAP_AllocSpaceFromYap(sbuflen)) == NULL) {
/* early exit */
yap_regfree(&reg);
@ -121,20 +129,20 @@ static int regexp(void)
YAP_FreeSpaceFromYap(sbuf);
return(FALSE);
}
pmatch = YAP_AllocSpaceFromYap(sizeof(regmatch_t)*nmatch);
out = yap_regexec(&reg,sbuf,(int)nmatch,pmatch,0);
pmatch = YAP_AllocSpaceFromYap(sizeof(regmatch_t)*(nmatch+1));
out = yap_regexec(&reg,sbuf,nmatch+1,pmatch,0);
if (out == 0) {
/* match succeed, let's fill the match in */
long int i;
YAP_Term TNil = YAP_MkAtomTerm(YAP_LookupAtom("[]"));
YAP_Functor FDiff = YAP_MkFunctor(YAP_LookupAtom("-"),2);
tout = YAP_ARG6;
for (i = 0; i < nmatch; i++) {
tout = TNil;
for (i = nmatch-1; i >= 0; --i) {
int j;
YAP_Term t = TNil;
if (pmatch[i].rm_so == -1) break;
if (pmatch[i].rm_so != -1) {
if (yap_flags & 2) {
YAP_Term to[2];
to[0] = YAP_MkIntTerm(pmatch[i].rm_so);
@ -145,12 +153,13 @@ static int regexp(void)
t = YAP_MkPairTerm(YAP_MkIntTerm(sbuf[j]),t);
}
}
YAP_Unify(t,YAP_HeadOfTerm(tout));
tout = YAP_TailOfTerm(tout);
tout = YAP_MkPairTerm(t,tout);
}
}
out = !YAP_Unify(tout, YAP_ARG6);
}
else if (out != REG_NOMATCH) {
return(FALSE);
out = 0;
}
yap_regfree(&reg);
YAP_FreeSpaceFromYap(buf);

3
library/regexp.yap
View File

@ -39,8 +39,7 @@ regexp(RegExp, String, Opts, OUT) :-
% OUT must be bound to a list of unbound variables.
% Check this and count how many.
%
check_out(V,_,_,G) :- var(V), !,
throw(error(instantiation_error,G)).
check_out(V,_,_,G) :- var(V), !.
check_out([],I,I,_) :- !.
check_out([V|L],I0,IF,G) :- !,
(nonvar(V) -> throw(error(type_error(variable,V),G)) ; true),