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libast: regex: backport robustness improvements from 93v- beta

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There are two main changes:

1. The regex code now creates and uses its own stack (env->mst)
   instead of using the shared standard stack (stkstd). That seems
   likely to be a good thing.

2. Missing mbinit() calls were inserted. The 93v- code uses a
   completely different multibyte characters API, so these needed
   to be translated back to the older API. But, as mbinit() is no
   longer a no-op as of 300cd199, these calls do stop things from
   breaking if a previous operation is interrupted mid-character.

I think there might be a couple of off-by-one errors fixed as well,
as there are two instances of this change:

-		while ((index += skip[buf[index]]) < mid);
+		while (index < mid)
+			index += skip[buf[index]];
This commit is contained in:
Martijn Dekker 2021-12-15 00:41:46 +01:00
parent 7c30a59e25
commit 1aa8f771d8
8 changed files with 89 additions and 60 deletions
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9
src/lib/libast/regex/regrexec.c
View file

@ -1,7 +1,7 @@
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2012 AT&T Intellectual Property *
* Copyright (c) 1985-2013 AT&T Intellectual Property *
* Copyright (c) 2020-2021 Contributors to ksh 93u+m *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
@ -34,9 +34,9 @@
*/
int
regrexec(const regex_t* p, const char* s, size_t len, size_t nmatch, regmatch_t* match, regflags_t flags, int sep, void* handle, regrecord_t record)
regrexec_20120528(const regex_t* p, const char* s, size_t len, size_t nmatch, regmatch_t* match, regflags_t flags, int sep, void* handle, regrecord_t record)
{
register unsigned char* buf = (unsigned char*)s;
register unsigned char* buf;
register unsigned char* beg;
register unsigned char* l;
register unsigned char* r;
@ -73,7 +73,8 @@ regrexec(const regex_t* p, const char* s, size_t len, size_t nmatch, regmatch_t*
index = leftlen++;
for (;;)
{
while ((index += skip[buf[index]]) < mid);
while (index < mid)
index += skip[buf[index]];
if (index < HIT)
goto impossible;
index -= HIT;