void
rec_set_nth_field_extern_bit(
/*=========================*/
rec_t* rec, /* in: record */
ulint i, /* in: ith field */
ibool val, /* in: value to set */
mtr_t* mtr) /* in: mtr holding an X-latch to the page where
rec is, or NULL; in the NULL case we do not
write to log about the change */
{
ulint info;
ut_a(!rec_get_1byte_offs_flag(rec));
ut_a(i < rec_get_n_fields(rec));
info = rec_2_get_field_end_info(rec, i);
if (val) {
info = info | REC_2BYTE_EXTERN_MASK;
} else {
info = info & ~REC_2BYTE_EXTERN_MASK;
}
if (mtr) {
mlog_write_ulint(rec - REC_N_EXTRA_BYTES - 2 * (i + 1), info,
MLOG_2BYTES, mtr);
} else {
rec_2_set_field_end_info(rec, i, info);
}
}
void
rec_set_nth_field_null_bit(
/*=======================*/
rec_t* rec, /* in: record */
ulint i, /* in: ith field */
ibool val) /* in: value to set */
{
ulint info;
if (rec_get_1byte_offs_flag(rec)) {
info = rec_1_get_field_end_info(rec, i);
if (val) {
info = info | REC_1BYTE_SQL_NULL_MASK;
} else {
info = info & ~REC_1BYTE_SQL_NULL_MASK;
}
rec_1_set_field_end_info(rec, i, info);
return;
}
info = rec_2_get_field_end_info(rec, i);
if (val) {
info = info | REC_2BYTE_SQL_NULL_MASK;
} else {
info = info & ~REC_2BYTE_SQL_NULL_MASK;
}
rec_2_set_field_end_info(rec, i, info);
}
static inline ibool ibrec_init_offsets_old(page_t *page, rec_t* rec, table_def_t* table, ulint* offsets) {
ulint i = 0;
ulint offs;
// First field is 0 bytes from origin point
rec_offs_base(offsets)[0] = 0;
// Init first bytes
rec_offs_set_n_fields(offsets, table->fields_count);
/* Old-style record: determine extra size and end offsets */
offs = REC_N_OLD_EXTRA_BYTES;
if (rec_get_1byte_offs_flag(rec)) {
offs += rec_offs_n_fields(offsets);
*rec_offs_base(offsets) = offs;
/* Determine offsets to fields */
do {
offs = rec_1_get_field_end_info(rec, i);
if (offs & REC_1BYTE_SQL_NULL_MASK) {
offs &= ~REC_1BYTE_SQL_NULL_MASK;
offs |= REC_OFFS_SQL_NULL;
}
offs &= 0xffff;
if (rec + offs - page > UNIV_PAGE_SIZE) {
if (debug) printf("Invalid offset for field %lu: %lu\n", i, offs);
return FALSE;
}
rec_offs_base(offsets)[1 + i] = offs;
} while (++i < rec_offs_n_fields(offsets));
} else {
offs += 2 * rec_offs_n_fields(offsets);
*rec_offs_base(offsets) = offs;
/* Determine offsets to fields */
do {
offs = rec_2_get_field_end_info(rec, i);
if (offs & REC_2BYTE_SQL_NULL_MASK) {
offs &= ~REC_2BYTE_SQL_NULL_MASK;
offs |= REC_OFFS_SQL_NULL;
}
if (offs & REC_2BYTE_EXTERN_MASK) {
offs &= ~REC_2BYTE_EXTERN_MASK;
offs |= REC_OFFS_EXTERNAL;
}
offs &= 0xffff;
if (rec + offs - page > UNIV_PAGE_SIZE) {
if (debug) printf("Invalid offset for field %lu: %lu\n", i, offs);
return FALSE;
}
rec_offs_base(offsets)[1 + i] = offs;
} while (++i < rec_offs_n_fields(offsets));
}
return TRUE;
}
byte*
rec_get_nth_field(
/*==============*/
/* out: pointer to the field */
rec_t* rec, /* in: record */
ulint n, /* in: index of the field */
ulint* len) /* out: length of the field; UNIV_SQL_NULL if SQL
null */
{
ulint os;
ulint next_os;
ut_ad(rec && len);
ut_ad(n < rec_get_n_fields(rec));
if (n > 1024) {
fprintf(stderr, "Error: trying to access field %lu in rec\n",
n);
ut_a(0);
}
if (rec == NULL) {
fprintf(stderr, "Error: rec is NULL pointer\n");
ut_a(0);
}
if (rec_get_1byte_offs_flag(rec)) {
os = rec_1_get_field_start_offs(rec, n);
next_os = rec_1_get_field_end_info(rec, n);
if (next_os & REC_1BYTE_SQL_NULL_MASK) {
*len = UNIV_SQL_NULL;
return(rec + os);
}
next_os = next_os & ~REC_1BYTE_SQL_NULL_MASK;
} else {
os = rec_2_get_field_start_offs(rec, n);
next_os = rec_2_get_field_end_info(rec, n);
if (next_os & REC_2BYTE_SQL_NULL_MASK) {
*len = UNIV_SQL_NULL;
return(rec + os);
}
next_os = next_os & ~(REC_2BYTE_SQL_NULL_MASK
| REC_2BYTE_EXTERN_MASK);
}
*len = next_os - os;
ut_ad(*len < UNIV_PAGE_SIZE);
return(rec + os);
}
