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The previous macro implementations just cast the argument to a target type but did not check whether the input type was appropriate. The function implementation can do better type checking of the input type. Reviewed-by: Aleksander Alekseev <aleksander@timescale.com> Discussion: https://www.postgresql.org/message-id/flat/8528fb7e-0aa2-6b54-85fb-0c0886dbd6ed%40enterprisedb.com
src/backend/utils/mb/README Encodings ========= conv.c: static functions and a public table for code conversion mbutils.c: public functions for the backend only. stringinfo_mb.c: public backend-only multibyte-aware stringinfo functions wstrcmp.c: strcmp for mb wstrncmp.c: strncmp for mb win866.c: a tool to generate KOI8 <--> CP866 conversion table iso.c: a tool to generate KOI8 <--> ISO8859-5 conversion table win1251.c: a tool to generate KOI8 <--> CP1251 conversion table See also in src/common/: encnames.c: public functions for encoding names wchar.c: mostly static functions and a public table for mb string and multibyte conversion Introduction ------------ http://www.cprogramming.com/tutorial/unicode.html