fis-gtm/sr_unix_cm/rc_prc_getr.c

316 lines
8.7 KiB
C

/****************************************************************
* *
* Copyright 2001, 2011 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_string.h"
#include "gdsroot.h"
#include "gdsblk.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "rc.h"
#include "cdb_sc.h"
#include "rc_oflow.h"
#include "copy.h"
#include "error.h"
#include "gtcm.h"
#include "t_end.h"
#include "t_retry.h"
#include "t_begin.h"
#include "gvcst_protos.h" /* for gvcst_search,gvcst_rtsib,gvcst_lftsib prototype */
GBLREF int rc_size_return;
GBLREF gd_addr *gd_header;
GBLREF gv_key *gv_currkey;
GBLREF gv_namehead *gv_target;
GBLREF sgmnt_data *cs_data;
GBLREF sgmnt_addrs *cs_addrs;
GBLDEF rc_oflow *rc_overflow;
GBLREF gd_region *gv_cur_region;
GBLREF trans_num rc_read_stamp;
GBLREF int gv_keysize;
error_def(ERR_GVGETFAIL);
int rc_prc_getr(rc_q_hdr *qhdr)
{
int key_size, data_len, i;
bool dollar_order, two_histories;
char *cp2, *cp1;
mval v;
short rsiz, bsiz, fmode, size_return;
rec_hdr *rp;
blk_hdr *bp;
srch_hist second_history;
enum cdb_sc status;
rc_req_getr *req;
rc_rsp_page *rsp;
srch_blk_status *bh;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
ESTABLISH_RET(rc_dbms_ch,0);
req = (rc_req_getr *)qhdr;
rsp = (rc_rsp_page *)qhdr;
rsp->hdr.a.len.value = (short)((char*)(&rsp->page[0]) - (char*)rsp);
fmode = qhdr->r.fmd.value;
if ((qhdr->a.erc.value = rc_fnd_file(&qhdr->r.xdsid)) != RC_SUCCESS)
{
REVERT;
DEBUG_ONLY(gtcm_cpktdmp((char *)qhdr,qhdr->a.len.value,"rc_fnd_file failed.");)
return -1;
}
if (req->key.len.value > cs_data->max_key_size)
{
qhdr->a.erc.value = RC_KEYTOOLONG;
rsp->size_return.value = 0;
rsp->size_remain.value = 0;
rsp->rstatus.value = 0;
REVERT;
return 0;
}
v.mvtype = MV_STR;
cp2 = req->key.key + req->key.len.value;
for (cp1 = req->key.key; *cp1 && cp1 < cp2; cp1++)
;
v.str.len = INTCAST(cp1 - req->key.key);
v.str.addr = req->key.key;
if (v.str.len > MAX_MIDENT_LEN) /* GT.M does not support global variables > MAX_MIDENT_LEN chars */
{
if (!(v.str.len == (MAX_MIDENT_LEN + 1) && v.str.addr[MAX_MIDENT_LEN] == 0x01))
{
qhdr->a.erc.value = RC_KEYTOOLONG;
rsp->size_return.value = 0;
rsp->size_remain.value = 0;
rsp->rstatus.value = 0;
REVERT;
DEBUG_ONLY(gtcm_cpktdmp((char *)qhdr,qhdr->a.len.value,"RC_KEYTOOLONG.");)
return -1;
}
}
GV_BIND_NAME_AND_ROOT_SEARCH(gd_header, &v.str);
memcpy(gv_currkey->base, req->key.key, req->key.len.value);
gv_currkey->end = req->key.len.value;
dollar_order = FALSE;
if (gv_currkey->base[gv_currkey->end - 1] == 0xFF)
{ TREF(gv_last_subsc_null) = TRUE; /* Trailing null subscript has NO trailing zero */
gv_currkey->base[gv_currkey->end] = 0;
gv_currkey->end += 1;
}else
{ TREF(gv_last_subsc_null) = FALSE;
if (gv_currkey->base[gv_currkey->end - 1] == 0x01)
{ dollar_order = TRUE;
gv_currkey->base[gv_currkey->end] = 0;
gv_currkey->end += 1;
}
}
if (!gv_target->root && (cp1 != cp2))
{
qhdr->a.erc.value = RC_MUMERRUNDEFVAR;
rsp->size_return.value = 0;
rsp->size_remain.value = 0;
rsp->rstatus.value = 0;
REVERT;
return 0;
}
gv_currkey->base[gv_currkey->end] = 0;
for (i = gv_currkey->end - 2; i > 0; i--)
if (!gv_currkey->base[i - 1])
break;
gv_currkey->prev = i;
if (fmode & RC_MODE_NEXT)
{
if (TREF(gv_last_subsc_null))
gv_currkey->base[gv_currkey->prev] = 01;
else {
if (dollar_order)
{ gv_currkey->end++;
gv_currkey->base[gv_currkey->end] = 0;
}else
{
gv_currkey->base[gv_currkey->end] = 1;
gv_currkey->base[gv_currkey->end + 1] = 0;
gv_currkey->base[gv_currkey->end + 2] = 0;
gv_currkey->end += 2;
}
}
}
else if (fmode & RC_MODE_PREV)
{
if (TREF(gv_last_subsc_null))
{
*(&gv_currkey->base[0] + gv_currkey->prev + 1) = 0xFF;
*(&gv_currkey->base[0] + gv_currkey->end + 1) = 0;
gv_currkey->end += 1;
}
}
rsp->size_return.value = 0;
if (dollar_order && (cp1 == cp2))
{
rc_gbl_ord(rsp);
REVERT;
return 0;
}
if (!gv_target->root)
{
qhdr->a.erc.value = RC_BADXBUF;
rsp->size_return.value = 0;
rsp->size_remain.value = 0;
rsp->rstatus.value = 0;
REVERT;
return 0;
}
t_begin(ERR_GVGETFAIL, 0);
for (;;)
{
rsp->hdr.a.len.value = (short)((char*)(&rsp->page[0]) - (char*)rsp);
size_return = rc_size_return;
two_histories = FALSE;
if ((status = gvcst_search(gv_currkey, NULL)) == cdb_sc_normal)
{
bh = gv_target->hist.h;
if (fmode & RC_MODE_NEXT) /* if getnext */
{
rp = (rec_hdr *)(bh->buffaddr + bh->curr_rec.offset);
bp = (blk_hdr *)bh->buffaddr;
if (rp >= (rec_hdr *)CST_TOB(bp))
{
two_histories = TRUE;
status = gvcst_rtsib(&second_history, 0);
if (status == cdb_sc_normal)
bh = second_history.h;
else
if (status == cdb_sc_endtree)
two_histories = FALSE; /* second history not valid */
else
goto restart;
}
}
else
if (fmode & RC_MODE_PREV) /* if get previous */
{
if (bh->prev_rec.offset == 0)
{
two_histories = TRUE;
status = gvcst_lftsib(&second_history);
if (status == cdb_sc_normal)
bh = second_history.h;
else
if (status == cdb_sc_endtree)
two_histories = FALSE; /* second history not valid */
else
goto restart;
}
}
if ((bsiz = ((blk_hdr *)(bh->buffaddr))->bsiz + RC_BLKHD_PAD) > SIZEOF(blk_hdr) + RC_BLKHD_PAD)
{ /* Non-empty block, global exists */
if (bsiz > size_return)
rc_overflow->size = bsiz - size_return;
else
{
rc_overflow->size = 0;
size_return = bsiz;
}
memcpy(rsp->page, bh->buffaddr, SIZEOF(blk_hdr));
PUT_SHORT(&((blk_hdr*)rsp->page)->bsiz,bsiz);
memcpy(rsp->page + SIZEOF(blk_hdr) + RC_BLKHD_PAD, bh->buffaddr + SIZEOF(blk_hdr),
size_return - (SIZEOF(blk_hdr) + RC_BLKHD_PAD));
rsp->size_return.value = size_return;
rsp->hdr.a.len.value += rsp->size_return.value;
assert(rsp->hdr.a.len.value <= rc_size_return+SIZEOF(rc_rsp_page));
rsp->zcode.value = (cs_data->blk_size / 512); /* (2 ** zcode) == blk_size */
if (rc_overflow->size)
{
memcpy(rc_overflow->buff, bh->buffaddr + size_return - RC_BLKHD_PAD, rc_overflow->size);
rc_overflow->offset = size_return;
rc_overflow->dsid = qhdr->r.xdsid.dsid.value;
rc_overflow->page = bh->blk_num;
rc_overflow->zcode = rsp->zcode.value;
}
rsp->size_remain.value = rc_overflow->size;
}
if (0 == (rc_read_stamp = t_end(&gv_target->hist, two_histories ? &second_history : NULL,
TN_NOT_SPECIFIED)))
continue;
if (bsiz == SIZEOF(blk_hdr) + RC_BLKHD_PAD) /* Empty block, global does not exist */
{
qhdr->a.erc.value = RC_MUMERRUNDEFVAR;
rsp->size_return.value = 0;
rsp->size_remain.value = 0;
rsp->rstatus.value = 0;
REVERT;
return 0;
}
if (status == cdb_sc_endtree)
{
if (fmode & RC_MODE_NEXT)
{ rsp->after.value = (unsigned short)-1;
rsp->before.value = 0;
}else
{ rsp->after.value = 0;
rsp->before.value = (unsigned short)-1;
}
rsp->xcc.value = 0;
}else
{
if (two_histories)
{
rsp->after.value = 0;
rsp->before.value = 0;
rsp->xcc.value = 0;
}else
{
if (fmode & RC_MODE_PREV) /* getprev */
{ rsp->before.value = bh->prev_rec.offset;
if (rsp->before.value)
rsp->before.value += RC_BLKHD_PAD;
rsp->xcc.value = bh->prev_rec.match;
rsp->after.value = bh->curr_rec.offset + RC_BLKHD_PAD;
}else /* if getnext or just get */
{ /* If key not found, use prev and curr, else use curr and next */
if (gv_currkey->end + 1 != bh->curr_rec.match) /* not found */
{ rsp->before.value = bh->prev_rec.offset;
if (rsp->before.value)
rsp->before.value += RC_BLKHD_PAD;
rsp->xcc.value = bh->prev_rec.match;
rsp->after.value = bh->curr_rec.offset + RC_BLKHD_PAD;
}else /* found */
{ rsp->before.value = bh->curr_rec.offset;
if (rsp->before.value)
rsp->before.value += RC_BLKHD_PAD;
rsp->xcc.value = bh->curr_rec.match;
rp = (rec_hdr *)(bh->buffaddr + bh->curr_rec.offset);
GET_SHORT(rsiz, &rp->rsiz);
rsp->after.value = bh->curr_rec.offset + rsiz + RC_BLKHD_PAD;
}
}
}
}
PUT_LONG(rsp->pageaddr, bh->blk_num);
rsp->frag_offset.value = 0;
rsp->rstatus.value = 0;
REVERT;
return 0;
}
restart: t_retry(status);
}
}