diff options
Diffstat (limited to 'src/backend/utils/adt/varlena.c')
| -rw-r--r-- | src/backend/utils/adt/varlena.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c index cdf185ea00b..95631eb2099 100644 --- a/src/backend/utils/adt/varlena.c +++ b/src/backend/utils/adt/varlena.c @@ -3398,6 +3398,27 @@ byteaSetBit(PG_FUNCTION_ARGS) PG_RETURN_BYTEA_P(res); } +/* + * Return reversed bytea + */ +Datum +bytea_reverse(PG_FUNCTION_ARGS) +{ + bytea *v = PG_GETARG_BYTEA_PP(0); + const char *p = VARDATA_ANY(v); + int len = VARSIZE_ANY_EXHDR(v); + const char *endp = p + len; + bytea *result = palloc(len + VARHDRSZ); + char *dst = (char *) VARDATA(result) + len; + + SET_VARSIZE(result, len + VARHDRSZ); + + while (p < endp) + *(--dst) = *p++; + + PG_RETURN_BYTEA_P(result); +} + /* text_name() * Converts a text type to a Name type. |