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Simplify and standardize conversions between TEXT datums and ordinary C

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strings.  This patch introduces four support functions cstring_to_text,
cstring_to_text_with_len, text_to_cstring, and text_to_cstring_buffer, and
two macros CStringGetTextDatum and TextDatumGetCString.  A number of
existing macros that provided variants on these themes were removed.

Most of the places that need to make such conversions now require just one
function or macro call, in place of the multiple notational layers that used
to be needed.  There are no longer any direct calls of textout or textin,
and we got most of the places that were using handmade conversions via
memcpy (there may be a few still lurking, though).

This commit doesn't make any serious effort to eliminate transient memory
leaks caused by detoasting toasted text objects before they reach
text_to_cstring.  We changed PG_GETARG_TEXT_P to PG_GETARG_TEXT_PP in a few
places where it was easy, but much more could be done.

Brendan Jurd and Tom Lane
This commit is contained in:
Tom Lane
2008-03-25 22:42:46 +00:00
parent f948197b40
commit 220db7ccd8
94 changed files with 771 additions and 1211 deletions
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28
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.439 2008/03/17 17:45:09 mha Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.440 2008/03/25 22:42:45 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -5364,7 +5364,6 @@ set_config_by_name(PG_FUNCTION_ARGS)
char *value;
char *new_value;
bool is_local;
text *result_text;
if (PG_ARGISNULL(0))
ereport(ERROR,
@ -5372,13 +5371,13 @@ set_config_by_name(PG_FUNCTION_ARGS)
errmsg("SET requires parameter name")));
/* Get the GUC variable name */
name = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(0)));
name = TextDatumGetCString(PG_GETARG_DATUM(0));
/* Get the desired value or set to NULL for a reset request */
if (PG_ARGISNULL(1))
value = NULL;
else
value = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(1)));
value = TextDatumGetCString(PG_GETARG_DATUM(1));
/*
* Get the desired state of is_local. Default to false if provided value
@ -5401,10 +5400,7 @@ set_config_by_name(PG_FUNCTION_ARGS)
new_value = GetConfigOptionByName(name, NULL);
/* Convert return string to text */
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(new_value)));
/* return it */
PG_RETURN_TEXT_P(result_text);
PG_RETURN_TEXT_P(cstring_to_text(new_value));
}
@ -5992,19 +5988,15 @@ show_config_by_name(PG_FUNCTION_ARGS)
{
char *varname;
char *varval;
text *result_text;
/* Get the GUC variable name */
varname = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(0)));
varname = TextDatumGetCString(PG_GETARG_DATUM(0));
/* Get the value */
varval = GetConfigOptionByName(varname, NULL);
/* Convert to text */
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(varval)));
/* return it */
PG_RETURN_TEXT_P(result_text);
PG_RETURN_TEXT_P(cstring_to_text(varval));
}
/*
@ -6609,7 +6601,7 @@ ProcessGUCArray(ArrayType *array,
if (isnull)
continue;
s = DatumGetCString(DirectFunctionCall1(textout, d));
s = TextDatumGetCString(d);
ParseLongOption(s, &name, &value);
if (!value)
@ -6657,7 +6649,7 @@ GUCArrayAdd(ArrayType *array, const char *name, const char *value)
newval = palloc(strlen(name) + 1 + strlen(value) + 1);
sprintf(newval, "%s=%s", name, value);
datum = DirectFunctionCall1(textin, CStringGetDatum(newval));
datum = CStringGetTextDatum(newval);
if (array)
{
@ -6684,7 +6676,7 @@ GUCArrayAdd(ArrayType *array, const char *name, const char *value)
&isnull);
if (isnull)
continue;
current = DatumGetCString(DirectFunctionCall1(textout, d));
current = TextDatumGetCString(d);
if (strncmp(current, newval, strlen(name) + 1) == 0)
{
index = i;
@ -6754,7 +6746,7 @@ GUCArrayDelete(ArrayType *array, const char *name)
&isnull);
if (isnull)
continue;
val = DatumGetCString(DirectFunctionCall1(textout, d));
val = TextDatumGetCString(d);
/* ignore entry if it's what we want to delete */
if (strncmp(val, name, strlen(name)) == 0