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Partial revert of 1a2ed3f67a

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Since Item_result enumerations are also used by MariaDB server, we
moved them back to mariadb_com.h.
Item_result is not used in Connector/C 3.3 and above for replication
api.
This commit is contained in:
Georg Richter
2024-12-22 11:00:12 +01:00
parent 80a7fa5cee
commit 12a7054194
3 changed files with 51 additions and 8 deletions
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43
libmariadb/mariadb_lib.c
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@ -879,6 +879,35 @@ static size_t rset_field_offsets[]= {
OFFSET(MYSQL_FIELD, org_name_length)
};
/* calculate lengths for field metadata:
returns zero on success, 1 if null_length was
detected */
static my_bool ma_get_rset_field_lengths(MYSQL_ROW row, unsigned int field_count,
unsigned long *lengths)
{
unsigned long *last_length= 0;
char *pos= 0;
MYSQL_ROW end= row + field_count + 1;
my_bool rc= 0;
while (row != end)
{
if (*row)
{
if (pos)
*last_length= (ulong)(*row - pos - 1);
pos= *row;
} else {
/* NULL_LENGTH (see also CONC-709) */
rc= 1;
*last_length= 0;
}
last_length= lengths++;
row++;
}
return rc;
}
MYSQL_FIELD *
unpack_fields(const MYSQL *mysql,
MYSQL_DATA *data, MA_MEM_ROOT *alloc, uint fields,
@ -895,21 +924,19 @@ unpack_fields(const MYSQL *mysql,
for (row=data->data; row ; row = row->next,field++)
{
unsigned long lengths[9];
if (field >= result + fields)
goto error;
if (ma_get_rset_field_lengths(row->data, field_count, lengths))
goto error;
for (i=0; i < field_count; i++)
{
uint length;
if (!row->data[i])
goto error;
length= (uint)(row->data[i+1] - row->data[i] - 1);
*(char **)(((char *)field) + rset_field_offsets[i*2])=
ma_strdup_root(alloc, (char *)row->data[i]);
*(unsigned int *)(((char *)field) + rset_field_offsets[i*2+1])= length;
*(unsigned int *)(((char *)field) + rset_field_offsets[i*2+1])= lengths[i];
}
field->extension= NULL;