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36760: more care with already unmetafied pattern trial strings

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This commit is contained in:
Peter Stephenson 2015-10-03 20:25:57 +01:00
parent 64061e504f
commit faeb9555d3
2 changed files with 45 additions and 15 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2015-10-03 Peter Stephenson <p.w.stephenson@ntlworld.com>
* 36760: Src/pattern.c: ensure we don't do anything untoward
with an already metafied pattern trial match.
2015-10-03 Mikael Magnusson <mikachu@gmail.com>
* 36754: Functions/TCP/tcp_open, Functions/TCP/tcp_read,

55
Src/pattern.c
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@ -2022,6 +2022,39 @@ pattrystart(void)
errsfound = 0;
}
/*
* Fix up string length stuff.
*
* If we call patallocstr() with "force" to set things up early, it's
* done there, else it's done in pattryrefs(). The reason for the
* difference is in the latter case we may not be relying on
* patallocstr() having an effect.
*/
/**/
static void
patmungestring(char **string, int *stringlen, int *unmetalenin)
{
/*
* Special signalling of empty tokenised string.
*/
if (*stringlen > 0 && **string == Nularg) {
(*string)++;
/*
* If we don't have an unmetafied length
* and need it (we may not) we'll get it later.
*/
if (*unmetalenin > 0)
(*unmetalenin)--;
if (*stringlen > 0)
(*stringlen)--;
}
/* Ensure we have a metafied length */
if (*stringlen < 0)
*stringlen = strlen(*string);
}
/*
* Allocate memeory for pattern match. Note this is specific to use
* of pattern *and* trial string.
@ -2039,7 +2072,8 @@ pattrystart(void)
* force is 1 if we always unmetafy: this is useful if we are going
* to try again with different versions of the string. If this is
* called from pattryrefs() we don't force unmetafication as it won't
* be optimal.
* be optimal. This option should be used if the resulting
* patstralloc is going to be passed to pattrylen() / pattryrefs().
* In patstralloc (supplied by caller, must last until last pattry is done)
* unmetalen is the unmetafied length of the string; it will be
* calculated if the input value is negative.
@ -2056,6 +2090,9 @@ char *patallocstr(Patprog prog, char *string, int stringlen, int unmetalen,
{
int needfullpath;
if (force)
patmungestring(&string, &stringlen, &unmetalen);
/*
* For a top-level ~-exclusion, we will need the full
* path to exclude, so copy the path so far and append the
@ -2224,21 +2261,9 @@ pattryrefs(Patprog prog, char *string, int stringlen, int unmetalenin,
maxnpos = *nump;
*nump = 0;
}
/*
* Special signalling of empty tokenised string.
*/
if ((!patstralloc || stringlen > 0) && *string == Nularg) {
string++;
if (unmetalenin > 0)
unmetalenin--;
if (stringlen > 0)
stringlen--;
}
if (stringlen < 0) {
DPUTS(patstralloc != NULL, "length needed with patstralloc");
stringlen = strlen(string);
}
if (!patstralloc)
patmungestring(&string, &stringlen, &unmetalenin);
origlen = stringlen;
if (patstralloc) {