/* Gamelon(tm) File I/O Library Sample Code C Language */
/* (C)1994 Menai Corporation(tm) Released for public use */
/* Example 8. How to conduct a Wandering Transaction */
/* alteration. */
/* The Wandering Transaction is simply an aggregation */
/* of multiple individual alterations. As a result, in */
/* order to specify a Wandering Transaction, the */
/* program need only indicate the beginning and end of */
/* the Wandering Transaction as follows: */
/* Beginning file layout: */
/* { } */
/* [2]{ }[3.14159] */
/* [5700304] */
#include <stdlib.h>
#include "gfcursor.h"
int main(void) {
char newchar = 'u';
short i = 17;
int valid;
CURSOR *c = new_CURSOR(NULL,
"newfile",
AM_SHARED,
NULL,
0);
eCursorQueryValid(c, &valid);
if (!valid)
exit(1);
eCursorMoveIn(c);
eCursorMoveLast(c, OT_OBJ);
eCursorMovePrior(c, OT_OBJ);
eCursorMoveIn(c);
eCursorMovePostLast(c);
eAltBeginWanderingTransaction(c);
eAltInsert(c);
eObjWriteChar(c, newchar);
eCursorMoveOut(c);
eCursorMovePreFirst(c);
eAltAppend(c);
eObjWriteAggregate(c);
eCursorMoveNext(c, OT_OBJ);
eAltModify(c);
/* Note: Newly added aggregate not */
/* accessible yet. Object being modified */
/* is the data object containing '2'. */
eObjWriteShort(c, i);
eAltCommitWanderingTransaction(c);
delete_CURSOR(c);
return 0;
}
/* Ending file layout: */
/* { } */
/* {}[17]{ }[3.14159] */
/* [5700304]['u'] */
/* Any and all individual simple or block alterations */
/* specified between the Begin Wandering Transaction */
/* and Commit Wandering Transaction calls will be */
/* submitted to the file as a single set of changes. */
/* They will only be written to file if all the */
/* specified changes can be written to file at the */
/* same time. */
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