diff options
Diffstat (limited to 'src/backend/utils/adt/varchar.c')
| -rw-r--r-- | src/backend/utils/adt/varchar.c | 193 |
1 files changed, 6 insertions, 187 deletions
diff --git a/src/backend/utils/adt/varchar.c b/src/backend/utils/adt/varchar.c index 77fb26a4807..5085c6025c2 100644 --- a/src/backend/utils/adt/varchar.c +++ b/src/backend/utils/adt/varchar.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.96 2003/05/12 23:08:50 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.97 2003/05/26 00:11:27 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -343,7 +343,10 @@ name_bpchar(PG_FUNCTION_ARGS) /***************************************************************************** - * varchar - varchar() * + * varchar - varchar(n) + * + * Note: varchar piggybacks on type text for most operations, and so has no + * C-coded functions except for I/O and typmod checking. *****************************************************************************/ /* @@ -700,7 +703,7 @@ bpcharcmp(PG_FUNCTION_ARGS) /* * bpchar needs a specialized hash function because we want to ignore - * trailing blanks in comparisons. (varchar can use plain hashvarlena.) + * trailing blanks in comparisons. */ Datum hashbpchar(PG_FUNCTION_ARGS) @@ -720,187 +723,3 @@ hashbpchar(PG_FUNCTION_ARGS) return result; } - - -/***************************************************************************** - * Functions used for varchar - *****************************************************************************/ - -Datum -varcharlen(PG_FUNCTION_ARGS) -{ - VarChar *arg = PG_GETARG_VARCHAR_P(0); - - /* optimization for single byte encoding */ - if (pg_database_encoding_max_length() <= 1) - PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ); - - PG_RETURN_INT32( - pg_mbstrlen_with_len(VARDATA(arg), VARSIZE(arg) - VARHDRSZ) - ); -} - -Datum -varcharoctetlen(PG_FUNCTION_ARGS) -{ - VarChar *arg = PG_GETARG_VARCHAR_P(0); - - PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ); -} - - -/***************************************************************************** - * Comparison Functions used for varchar - * - * Note: btree indexes need these routines not to leak memory; therefore, - * be careful to free working copies of toasted datums. Most places don't - * need to be so careful. - *****************************************************************************/ - -Datum -varchareq(PG_FUNCTION_ARGS) -{ - VarChar *arg1 = PG_GETARG_VARCHAR_P(0); - VarChar *arg2 = PG_GETARG_VARCHAR_P(1); - int len1, - len2; - bool result; - - len1 = VARSIZE(arg1) - VARHDRSZ; - len2 = VARSIZE(arg2) - VARHDRSZ; - - /* fast path for different-length inputs */ - if (len1 != len2) - result = false; - else - result = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) == 0); - - PG_FREE_IF_COPY(arg1, 0); - PG_FREE_IF_COPY(arg2, 1); - - PG_RETURN_BOOL(result); -} - -Datum -varcharne(PG_FUNCTION_ARGS) -{ - VarChar *arg1 = PG_GETARG_VARCHAR_P(0); - VarChar *arg2 = PG_GETARG_VARCHAR_P(1); - int len1, - len2; - bool result; - - len1 = VARSIZE(arg1) - VARHDRSZ; - len2 = VARSIZE(arg2) - VARHDRSZ; - - /* fast path for different-length inputs */ - if (len1 != len2) - result = true; - else - result = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) != 0); - - PG_FREE_IF_COPY(arg1, 0); - PG_FREE_IF_COPY(arg2, 1); - - PG_RETURN_BOOL(result); -} - -Datum -varcharlt(PG_FUNCTION_ARGS) -{ - VarChar *arg1 = PG_GETARG_VARCHAR_P(0); - VarChar *arg2 = PG_GETARG_VARCHAR_P(1); - int len1, - len2; - int cmp; - - len1 = VARSIZE(arg1) - VARHDRSZ; - len2 = VARSIZE(arg2) - VARHDRSZ; - - cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2); - - PG_FREE_IF_COPY(arg1, 0); - PG_FREE_IF_COPY(arg2, 1); - - PG_RETURN_BOOL(cmp < 0); -} - -Datum -varcharle(PG_FUNCTION_ARGS) -{ - VarChar *arg1 = PG_GETARG_VARCHAR_P(0); - VarChar *arg2 = PG_GETARG_VARCHAR_P(1); - int len1, - len2; - int cmp; - - len1 = VARSIZE(arg1) - VARHDRSZ; - len2 = VARSIZE(arg2) - VARHDRSZ; - - cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2); - - PG_FREE_IF_COPY(arg1, 0); - PG_FREE_IF_COPY(arg2, 1); - - PG_RETURN_BOOL(cmp <= 0); -} - -Datum -varchargt(PG_FUNCTION_ARGS) -{ - VarChar *arg1 = PG_GETARG_VARCHAR_P(0); - VarChar *arg2 = PG_GETARG_VARCHAR_P(1); - int len1, - len2; - int cmp; - - len1 = VARSIZE(arg1) - VARHDRSZ; - len2 = VARSIZE(arg2) - VARHDRSZ; - - cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2); - - PG_FREE_IF_COPY(arg1, 0); - PG_FREE_IF_COPY(arg2, 1); - - PG_RETURN_BOOL(cmp > 0); -} - -Datum -varcharge(PG_FUNCTION_ARGS) -{ - VarChar *arg1 = PG_GETARG_VARCHAR_P(0); - VarChar *arg2 = PG_GETARG_VARCHAR_P(1); - int len1, - len2; - int cmp; - - len1 = VARSIZE(arg1) - VARHDRSZ; - len2 = VARSIZE(arg2) - VARHDRSZ; - - cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2); - - PG_FREE_IF_COPY(arg1, 0); - PG_FREE_IF_COPY(arg2, 1); - - PG_RETURN_BOOL(cmp >= 0); -} - -Datum -varcharcmp(PG_FUNCTION_ARGS) -{ - VarChar *arg1 = PG_GETARG_VARCHAR_P(0); - VarChar *arg2 = PG_GETARG_VARCHAR_P(1); - int len1, - len2; - int cmp; - - len1 = VARSIZE(arg1) - VARHDRSZ; - len2 = VARSIZE(arg2) - VARHDRSZ; - - cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2); - - PG_FREE_IF_COPY(arg1, 0); - PG_FREE_IF_COPY(arg2, 1); - - PG_RETURN_INT32(cmp); -} |