SparrowOSTS_121127.ISO

SparrowOS/Demo/Dsk/DataBase.CPP

@@ -0,0 +1,68 @@
+#define DB_FILENAME	"HOME/DataBaseDemo.BIN"
+#define DB_MAX_ACCT	100
+#define DB_ACCT_BLKS	1
+
+class Acct
+{ //Use <CTRL-L> to help generate fmtstrs.
+  U8 name[32] fmtstr "$$DA-P,32,\"Name:%s\"$$\n";
+  U8 addr[64] fmtstr "$$DA-P,64,\"Addr:%s\"$$\n";
+  U8 pad[DB_ACCT_BLKS*BLK_SIZE-64-32];
+};
+
+
+U0 InitDatabase()
+{
+  CFile *f;
+  //Write new contiguous file
+  f=FOpen(DB_FILENAME,"w",DB_MAX_ACCT*DB_ACCT_BLKS);
+  FClose(f);
+}
+
+
+U0 WriteAcct()
+{
+  CFile *f;
+  Acct a;
+  I64 acctnum;
+
+  acctnum=PmtI64("Acct #",-1);
+  if (0<=acctnum<DB_MAX_ACCT) {
+    MemSet(&a,0,BLK_SIZE);
+    if (DocFormDo(&a,"Acct")) {
+      f=FOpen(DB_FILENAME,"w+");
+      FWBlks(f,&a,acctnum*DB_ACCT_BLKS,DB_ACCT_BLKS);
+      FClose(f);
+    }
+  }
+}
+
+U0 ReadAcct()
+{
+  CFile *f;
+  Acct a;
+  I64 acctnum;
+
+  acctnum=PmtI64("Acct #",-1);
+  if (0<=acctnum<DB_MAX_ACCT) {
+    f=FOpen(DB_FILENAME,"r");
+    FRBlks(f,&a,acctnum*DB_ACCT_BLKS,DB_ACCT_BLKS);
+    FClose(f);
+    ClassRep("Acct",&a);
+  }
+}
+
+U0 DatabaseDemo()
+{
+  I64 ch;
+  if (!FileFind(DB_FILENAME))
+    InitDatabase;
+  do {
+    "$$FG,GREEN$$R$$FG$$ead acct, $$FG,GREEN$$W$$FG$$rite acct or $$FG,GREEN$$<SHIFT-ESC>$$FG$$:";
+    ch=ToUpper(GetChar);
+    NewLine;
+    if (ch=='R') ReadAcct;
+    if (ch=='W') WriteAcct;
+  } while (ch!=CH_SHIFT_ESC && ch!=CH_ESC);
+}
+
+DatabaseDemo;