/*
* Extract the next non-wildcard part of a search string, ie, a word bounded
* by '_' or '%' meta-characters, non-word characters or string end.
*
* str: source string, of length lenstr bytes (need not be null-terminated)
* buf: where to return the substring (must be long enough)
* *bytelen: receives byte length of the found substring
* *charlen: receives character length of the found substring
*
* Returns pointer to end+1 of the found substring in the source string.
* Returns NULL if no word found (in which case buf, bytelen, charlen not set)
*
* If the found word is bounded by non-word characters or string boundaries
* then this function will include corresponding padding spaces into buf.
*/
static const char *
get_wildcard_part(const char *str, int lenstr,
char *buf, int *bytelen, int *charlen)
{
const char *beginword = str;
const char *endword;
char *s = buf;
bool in_leading_wildcard_meta = false;
bool in_trailing_wildcard_meta = false;
bool in_escape = false;
int clen;
/*
* Find the first word character, remembering whether preceding character
* was wildcard meta-character. Note that the in_escape state persists
* from this loop to the next one, since we may exit at a word character
* that is in_escape.
*/
while (beginword - str < lenstr)
{
if (in_escape)
{
if (iswordchr(beginword))
break;
in_escape = false;
in_leading_wildcard_meta = false;
}
else
{
if (ISESCAPECHAR(beginword))
in_escape = true;
else if (ISWILDCARDCHAR(beginword))
in_leading_wildcard_meta = true;
else if (iswordchr(beginword))
break;
else
in_leading_wildcard_meta = false;
}
beginword += pg_mblen(beginword);
}
/*
* Handle string end.
*/
if (beginword - str >= lenstr)
return NULL;
/*
* Add left padding spaces if preceding character wasn't wildcard
* meta-character.
*/
*charlen = 0;
if (!in_leading_wildcard_meta)
{
if (LPADDING > 0)
{
*s++ = ' ';
(*charlen)++;
if (LPADDING > 1)
{
*s++ = ' ';
(*charlen)++;
}
}
}
/*
* Copy data into buf until wildcard meta-character, non-word character or
* string boundary. Strip escapes during copy.
*/
endword = beginword;
while (endword - str < lenstr)
{
clen = pg_mblen(endword);
if (in_escape)
{
if (iswordchr(endword))
{
memcpy(s, endword, clen);
(*charlen)++;
s += clen;
}
else
{
/*
* Back up endword to the escape character when stopping at
* an escaped char, so that subsequent get_wildcard_part will
* restart from the escape character. We assume here that
* escape chars are single-byte.
*/
endword--;
break;
}
in_escape = false;
}
else
{
if (ISESCAPECHAR(endword))
in_escape = true;
else if (ISWILDCARDCHAR(endword))
{
in_trailing_wildcard_meta = true;
break;
}
else if (iswordchr(endword))
{
memcpy(s, endword, clen);
(*charlen)++;
s += clen;
}
else
break;
}
endword += clen;
}
/*
* Add right padding spaces if next character isn't wildcard
* meta-character.
*/
if (!in_trailing_wildcard_meta)
{
if (RPADDING > 0)
{
*s++ = ' ';
(*charlen)++;
if (RPADDING > 1)
{
*s++ = ' ';
(*charlen)++;
}
}
}
*bytelen = s - buf;
return endword;
}
/*
* Extract the next non-wildcard part of a search string, ie, a word bounded
* by '_' or '%' meta-characters, non-word characters or string end.
*
* str: source string, of length lenstr bytes (need not be null-terminated)
* buf: where to return the substring (must be long enough)
* *bytelen: receives byte length of the found substring
* *charlen: receives character length of the found substring
*
* Returns pointer to end+1 of the found substring in the source string.
* Returns NULL if no word found (in which case buf, bytelen, charlen not set)
*
* If the found word is bounded by non-word characters or string boundaries
* then this function will include corresponding padding spaces into buf.
*/
static const char *
get_wildcard_part(const char *str, int lenstr,
char *buf, int *bytelen, int *charlen)
{
const char *beginword = str;
const char *endword;
char *s = buf;
bool in_wildcard_meta = false;
bool in_escape = false;
int clen;
/*
* Find the first word character remembering whether last character was
* wildcard meta-character.
*/
while (beginword - str < lenstr)
{
if (in_escape)
{
in_escape = false;
in_wildcard_meta = false;
if (iswordchr(beginword))
break;
}
else
{
if (ISESCAPECHAR(beginword))
in_escape = true;
else if (ISWILDCARDCHAR(beginword))
in_wildcard_meta = true;
else if (iswordchr(beginword))
break;
else
in_wildcard_meta = false;
}
beginword += pg_mblen(beginword);
}
/*
* Handle string end.
*/
if (beginword - str >= lenstr)
return NULL;
/*
* Add left padding spaces if last character wasn't wildcard
* meta-character.
*/
*charlen = 0;
if (!in_wildcard_meta)
{
if (LPADDING > 0)
{
*s++ = ' ';
(*charlen)++;
if (LPADDING > 1)
{
*s++ = ' ';
(*charlen)++;
}
}
}
/*
* Copy data into buf until wildcard meta-character, non-word character or
* string boundary. Strip escapes during copy.
*/
endword = beginword;
in_wildcard_meta = false;
in_escape = false;
while (endword - str < lenstr)
{
clen = pg_mblen(endword);
if (in_escape)
{
in_escape = false;
in_wildcard_meta = false;
if (iswordchr(endword))
{
memcpy(s, endword, clen);
(*charlen)++;
s += clen;
}
else
break;
}
else
{
if (ISESCAPECHAR(endword))
in_escape = true;
else if (ISWILDCARDCHAR(endword))
{
in_wildcard_meta = true;
break;
}
else if (iswordchr(endword))
{
memcpy(s, endword, clen);
(*charlen)++;
s += clen;
}
else
{
in_wildcard_meta = false;
break;
}
}
endword += clen;
}
/*
* Add right padding spaces if last character wasn't wildcard
* meta-character.
*/
if (!in_wildcard_meta)
{
if (RPADDING > 0)
{
*s++ = ' ';
(*charlen)++;
if (RPADDING > 1)
{
*s++ = ' ';
(*charlen)++;
}
}
}
*bytelen = s - buf;
return endword;
}