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Add wchar -> mb conversion routines.

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This is infrastructure for Alexander Korotkov's work on indexing regular
expression searches.

Alexander Korotkov, with a bit of further hackery on the MULE conversion
by me
This commit is contained in:
Robert Haas
2012-07-04 17:10:10 -04:00
parent 248b5fce06
commit 72dd6291f2
3 changed files with 248 additions and 45 deletions
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22
src/backend/utils/mb/mbutils.c
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@@ -710,6 +710,28 @@ pg_encoding_mb2wchar_with_len(int encoding,
return (*pg_wchar_table[encoding].mb2wchar_with_len) ((const unsigned char *) from, to, len);
}
/* convert a wchar string to a multibyte */
int
pg_wchar2mb(const pg_wchar *from, char *to)
{
return (*pg_wchar_table[DatabaseEncoding->encoding].wchar2mb_with_len) (from, (unsigned char *)to, pg_wchar_strlen(from));
}
/* convert a wchar string to a multibyte with a limited length */
int
pg_wchar2mb_with_len(const pg_wchar *from, char *to, int len)
{
return (*pg_wchar_table[DatabaseEncoding->encoding].wchar2mb_with_len) (from, (unsigned char *)to, len);
}
/* same, with any encoding */
int
pg_encoding_wchar2mb_with_len(int encoding,
const pg_wchar *from, char *to, int len)
{
return (*pg_wchar_table[encoding].wchar2mb_with_len) (from, (unsigned char *)to, len);
}
/* returns the byte length of a multibyte character */
int
pg_mblen(const char *mbstr)