353 lines
11 KiB
C
353 lines
11 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include <sys/types.h>
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#include <errno.h>
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#include "gtm_string.h"
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#include "gtm_fcntl.h"
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#include "gtm_unistd.h"
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#include "gtm_stat.h"
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#include "gtm_stdio.h"
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#include "rtnhdr.h"
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#include "zroutines.h"
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#include "compiler.h"
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#include "srcline.h"
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#include "gtmio.h"
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#include "eintr_wrappers.h"
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#include "op.h"
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#include "zbreak.h"
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#include "hashtab_mname.h"
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#ifdef GTM_TRIGGER
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# include "gdsroot.h"
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# include "gtm_facility.h"
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# include "fileinfo.h"
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# include "gdsbt.h"
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# include "gdsfhead.h"
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# include "gv_trigger.h"
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# include "cdb_sc.h"
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# include "t_retry.h"
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# include "trigger_source_read_andor_verify.h"
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#endif
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#define RT_TBL_SZ 20
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GBLREF uint4 dollar_tlevel;
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GBLREF unsigned int t_tries;
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LITDEF char litconst_space = ' ';
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error_def(ERR_TXTSRCFMT);
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error_def(ERR_SYSCALL);
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int get_src_line(mval *routine, mval *label, int offset, mstr **srcret, boolean_t verifytrig)
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{
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int srcrecs, *lt_ptr, size, line_indx, srcfilnamlen;
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uint4 checksum;
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boolean_t found, added, eof_seen, srcstat;
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mstr src;
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rhdtyp *rtn_vector;
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zro_ent *srcdir;
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mstr *base, *current, *top;
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char buff[MAX_SRCLINE], *cptr, *srcfile_name;
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char srcnamebuf[SIZEOF(mident_fixed) + STR_LIT_LEN(DOTM)];
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ht_ent_mname *tabent;
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var_tabent rtnent;
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routine_source *src_tbl;
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int rc, fclose_res;
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char *fgets_rc;
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FILE *fp;
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struct stat srcfile_stat;
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off_t srcsize;
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unsigned char *srcptr, *srcptr_max, *srcstart;
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# ifdef GTM_TRIGGER
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boolean_t is_trigger;
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# endif
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DCL_THREADGBL_ACCESS;
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SETUP_THREADGBL_ACCESS;
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srcstat = 0;
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*srcret = NULL;
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if (NULL == (TREF(rt_name_tbl)).base)
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init_hashtab_mname(TADR(rt_name_tbl), RT_TBL_SZ, HASHTAB_COMPACT, HASHTAB_SPARE_TABLE);
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assert (routine->mvtype & MV_STR);
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/* The source to be loaded can be of two types:
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*
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* 1. Normal routine source to be looked up on disk
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* 2. Trigger source located in a database.
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*
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* Determine which source we need.
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*/
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GTMTRIG_ONLY(IS_TRIGGER_RTN(&routine->str, is_trigger));
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/* Need source on a trigger. Get trigger source loaded and/or verified which may involve
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* creating a TP fence and dealing with TP restarts.
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*/
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# ifdef GTM_TRIGGER
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if (is_trigger)
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{ /* ZPRINT wants a consistent view of triggers across multiple calls so it bypasses verification
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* after the first call. In this case, the trigger had better be found since the first call found it.
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*/
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if (verifytrig)
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{
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rc = trigger_source_read_andor_verify(&routine->str, TRIGGER_SRC_LOAD);
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if (0 != rc)
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return SRCNOTAVAIL;
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}
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rtn_vector = find_rtn_hdr(&routine->str); /* Trigger routine should be loaded now */
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if (NULL == rtn_vector)
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{
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assert(verifytrig); /* Noverify trig should always be found */
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return SRCNOTAVAIL; /* Could happen if trigger name got modified or uniqueified */
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}
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} else
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# endif
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{
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if (NULL == (rtn_vector = find_rtn_hdr(&routine->str))) /* Note assignment */
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{
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op_zlink(routine, NULL);
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rtn_vector = find_rtn_hdr(&routine->str);
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if (NULL == rtn_vector)
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return OBJMODMISS;
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}
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}
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if (!rtn_vector->src_full_name.len)
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return SRCNOTAVAIL;
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rtnent.var_name = rtn_vector->routine_name;
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COMPUTE_HASH_MNAME(&rtnent);
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added = add_hashtab_mname(TADR(rt_name_tbl), &rtnent, NULL, &tabent);
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src_tbl = (routine_source *)tabent->value;
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if (added || (NULL == tabent->value))
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{
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checksum = 0;
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# ifdef GTM_TRIGGER
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if (is_trigger)
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{
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srcstart = (unsigned char *)((gv_trigger_t *)rtn_vector->trigr_handle)->xecute_str.str.addr;
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srcsize = ((gv_trigger_t *)rtn_vector->trigr_handle)->xecute_str.str.len;
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assert(0 < srcsize);
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assert(NULL != srcstart);
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srcrecs = (int)rtn_vector->lnrtab_len;
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/* Allocate the array to hold the mstr array pointing to the src lines. */
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src_tbl = (routine_source *)malloc(SIZEOF(routine_source) + ((srcrecs - 1) * SIZEOF(mstr)));
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src_tbl->srcbuff = srcstart;
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src_tbl->srcrecs = srcrecs;
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/* Remove the source buffer from the trigger descriptor so nobody frees it inappropriately */
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((gv_trigger_t *)rtn_vector->trigr_handle)->xecute_str.str.len = 0;
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((gv_trigger_t *)rtn_vector->trigr_handle)->xecute_str.str.addr = NULL;
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/* Parse code setting the mstrs for each line encountered */
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srcptr = srcstart;
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srcptr_max = srcptr + srcsize;
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for (current = (src_tbl->srclines + 1), top = current + (srcrecs - 1); current < top; current++)
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{
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assert(srcptr < srcptr_max);
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current->addr = (char *)srcstart;
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/* Find end of this record */
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for (; (srcptr < srcptr_max) && ('\n' != *srcptr); srcptr++)
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;
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if (0 != (size = (srcptr - (unsigned char *)current->addr))) /* note assignment */
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{ /* Do checksum computation plus set length */
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RTN_SRC_CHKSUM((char *)srcstart, size, checksum);
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current->len = size;
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} else
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{ /* Null record - point to a single space for the record */
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current->addr = (char *)&litconst_space;
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current->len = 1;
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}
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srcptr++; /* Skip line end char */
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srcstart = srcptr;
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}
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if (checksum != rtn_vector->checksum)
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{ /* Should never happen with a trigger unless it ran into some restartable concurrency
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* issues. Assert we can restart and do it.
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*/
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if (0 < dollar_tlevel)
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{
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assert(CDB_STAGNATE > t_tries);
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t_retry(cdb_sc_triggermod);
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} else
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GTMASSERT;
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}
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} else
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# endif
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{
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srcfile_name = malloc(rtn_vector->src_full_name.len + 1);
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memcpy(srcfile_name, rtn_vector->src_full_name.addr, rtn_vector->src_full_name.len);
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*(srcfile_name + rtn_vector->src_full_name.len) = 0; /* ensure string is null terminated */
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/* At this point, it is not clear if Fopen will handle zos tagging correctly in all cases.
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* especially when tagged with other than ISO8859-1 or IBM-1047. When we resurrect the zOS
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* platform, we need to test this out.
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*/
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fp = Fopen(srcfile_name, "r");
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if (NULL == fp)
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{
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free(srcfile_name);
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srcfile_name = NULL;
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srcfilnamlen = (int)rtn_vector->routine_name.len;
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memcpy(srcnamebuf, rtn_vector->routine_name.addr, srcfilnamlen);
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if (srcnamebuf[0] == '%') /* percents are translated to _ on filenames */
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srcnamebuf[0] = '_';
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MEMCPY_LIT(&srcnamebuf[srcfilnamlen], DOTM);
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src.addr = srcnamebuf;
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src.len = INTCAST(srcfilnamlen + STR_LIT_LEN(DOTM));
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zro_search (0, 0, &src, &srcdir, TRUE);
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if (srcdir)
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{
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srcfile_name = malloc(src.len + srcdir->str.len + 2);
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memcpy(srcfile_name, srcdir->str.addr, srcdir->str.len);
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cptr = srcfile_name + srcdir->str.len;
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*cptr++ = '/';
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memcpy(cptr, src.addr, src.len);
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cptr += src.len;
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*cptr++ = 0;
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fp = Fopen(srcfile_name, "r");
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if (NULL == fp)
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{
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rts_error(VARLSTCNT(1) errno);
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assert(FALSE);
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}
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found = TRUE;
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} else
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found = FALSE;
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} else
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found = TRUE;
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if (!found)
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{
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srcstat |= SRCNOTFND;
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srcrecs = 0;
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srcsize = 0;
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} else
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{
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srcrecs = (int)rtn_vector->lnrtab_len;
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/* Find out how big the file is so we can allocate the memory in one shot */
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if ((NULL != fp) && !(srcstat & (SRCNOTFND | SRCNOTAVAIL)))
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{
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rc = stat(srcfile_name, &srcfile_stat);
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if (0 != rc)
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{
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free(srcfile_name);
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rts_error(VARLSTCNT(8) ERR_SYSCALL, 5, LEN_AND_LIT("stat"), CALLFROM, rc);
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}
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srcsize = srcfile_stat.st_size;
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} else
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srcsize = 0;
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}
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if (NULL != srcfile_name)
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free(srcfile_name);
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assert((found && srcrecs >= 1) || (srcrecs == 0));
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/* Allocate source mstr structure. Since structure has one mstr in it, allocate one less.
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* Note, the size we get from lnrtab_len has an extra [0] origin entry in the total. This
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* entry is not used in the source array for direct referencing ease.
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*/
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src_tbl = (routine_source *)malloc(SIZEOF(routine_source) + ((srcrecs - 1) * SIZEOF(mstr)));
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src_tbl->srcbuff = (0 < srcsize) ? malloc(srcsize) : NULL;
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base = src_tbl->srclines;
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srcptr = src_tbl->srcbuff;
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DEBUG_ONLY(srcptr_max = srcptr + srcsize);
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src_tbl->srcrecs = srcrecs;
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eof_seen = FALSE;
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for (current = base + 1, top = base + srcrecs ; current < top ; current++)
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{
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assert(found && (NULL != fp));
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if (!eof_seen)
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{
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FGETS(buff, MAX_SRCLINE, fp, fgets_rc);
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if (NULL == fgets_rc)
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{
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if (ferror(fp))
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{
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FCLOSE(fp, fclose_res);
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assert(!fclose_res);
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rts_error(VARLSTCNT(3) ERR_TXTSRCFMT, 0, errno);
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assert(FALSE);
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} else
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{
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eof_seen = TRUE;
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assert(feof(fp));
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size = 0;
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}
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} else
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{
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size = (int)STRLEN(buff);
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/* Strip trailing '\n' if any (if at least one byte was read in) */
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if (size && ('\n' == buff[size - 1]))
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size--;
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}
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} else /* eof seen; nothing more to read in file */
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size = 0;
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if (size)
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{ /* Calculate checksum to verify with loaded routine */
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RTN_SRC_CHKSUM(buff, size, checksum);
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assert(NULL != srcptr);
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assert((srcptr + size) <= srcptr_max);
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current->len = size;
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current->addr = (char *)srcptr;
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memcpy(srcptr, buff, size);
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srcptr += size;
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} else
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{
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current->addr = (char *)&litconst_space;
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current->len = 1;
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}
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}
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if (found)
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{
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*base = *(base + 1);
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/* Ensure we have reached the end of the source file. If not, we need to issue a CHECKSUMFAIL
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* error. Most often the !eof_seen part of the check is not needed since the checksums will not
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* match. But if it so happens that the checksums do match, then this extra check helps us
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* correctly identify a TXTSRCMAT error.
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*/
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if (!eof_seen)
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{
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FGETS(buff, MAX_SRCLINE, fp, fgets_rc);
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if ((NULL == fgets_rc) && !ferror(fp))
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{
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eof_seen = TRUE;
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assert(feof(fp));
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}
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}
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if (!eof_seen || (checksum != rtn_vector->checksum))
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srcstat |= CHECKSUMFAIL;
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FCLOSE(fp, fclose_res);
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assert(!fclose_res);
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}
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}
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src_tbl->srcstat = srcstat;
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tabent->value = (char *)src_tbl;
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} else
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srcstat |= src_tbl->srcstat;
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lt_ptr = (int *)find_line_addr(rtn_vector, &label->str, 0, NULL);
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if (!lt_ptr)
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srcstat |= LABELNOTFOUND;
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else if (!(srcstat & (SRCNOTFND | SRCNOTAVAIL)))
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{
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line_indx = (int)(lt_ptr - (int *)LNRTAB_ADR(rtn_vector));
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line_indx += offset;
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if (line_indx == 0)
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srcstat |= ZEROLINE;
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else if (line_indx < 0)
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srcstat |= NEGATIVELINE;
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else if (line_indx >= rtn_vector->lnrtab_len)
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srcstat |= AFTERLASTLINE;
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else /* successfully located line */
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{
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*srcret = &src_tbl->srclines[line_indx];
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/* DBGFPF((stderr, "get_src_line: returning string %.*s\n", (*srcret)->len, (*srcret)->addr)); */
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}
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}
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return srcstat;
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}
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