/*
* pg_mbcliplen with specified encoding
*/
int
pg_encoding_mbcliplen(int encoding, const char *mbstr,
int len, int limit)
{
mblen_converter mblen_fn;
int clen = 0;
int l;
/* optimization for single byte encoding */
if (pg_encoding_max_length(encoding) == 1)
return cliplen(mbstr, len, limit);
mblen_fn = pg_wchar_table[encoding].mblen;
while (len > 0 && *mbstr)
{
l = (*mblen_fn) ((const unsigned char *) mbstr);
if ((clen + l) > limit)
break;
clen += l;
if (clen == limit)
break;
len -= l;
mbstr += l;
}
return clen;
}
/*
* Similar to pg_mbcliplen except the limit parameter specifies the
* character length, not the byte length.
*/
int
pg_mbcharcliplen(const char *mbstr, int len, int limit)
{
int clen = 0;
int nch = 0;
int l;
/* optimization for single byte encoding */
if (pg_database_encoding_max_length() == 1)
return cliplen(mbstr, len, limit);
while (len > 0 && *mbstr)
{
l = pg_mblen(mbstr);
nch++;
if (nch > limit)
break;
clen += l;
len -= l;
mbstr += l;
}
return clen;
}
/*
* returns the byte length of a multibyte string
* (not necessarily NULL terminated)
* that is no longer than limit.
* this function does not break multibyte word boundary.
*/
int
pg_mbcliplen(const unsigned char *mbstr, int len, int limit)
{
int clen = 0;
int l;
/* optimization for single byte encoding */
if (pg_database_encoding_max_length() == 1)
return cliplen(mbstr, len, limit);
while (len > 0 && *mbstr)
{
l = pg_mblen(mbstr);
if ((clen + l) > limit)
break;
clen += l;
if (clen == limit)
break;
len -= l;
mbstr += l;
}
return (clen);
}
