venti: add demo programs readfile.c and writefile.c

src/cmd/venti/writefile.c

@@ -0,0 +1,106 @@
+#include <u.h>
+#include <libc.h>
+#include <venti.h>
+#include <libsec.h>
+#include <thread.h>
+
+enum
+{
+	Blocksize = 8192
+};
+
+int chatty;
+
+void
+usage(void)
+{
+	fprint(2, "usage: writefile [-v] [-h host] < data\n");
+	threadexitsall("usage");
+}
+
+void
+threadmain(int argc, char *argv[])
+{
+	int n;
+	uchar score[VtScoreSize];
+	uchar *buf;
+	char *host;
+	vlong off;
+	VtEntry e;
+	VtRoot root;
+	VtCache *c;
+	VtConn *z;
+	VtFile *f;
+
+	quotefmtinstall();
+	fmtinstall('F', vtfcallfmt);
+	fmtinstall('V', vtscorefmt);
+
+	host = nil;
+	ARGBEGIN{
+	case 'V':
+		chattyventi++;
+		break;
+	case 'h':
+		host = EARGF(usage());
+		break;
+	case 'v':
+		chatty++;
+		break;
+	default:
+		usage();
+		break;
+	}ARGEND
+
+	if(argc != 0)
+		usage();
+
+	buf = vtmallocz(Blocksize);
+
+	z = vtdial(host);
+	if(z == nil)
+		sysfatal("could not connect to server: %r");
+
+	if(vtconnect(z) < 0)
+		sysfatal("vtconnect: %r");
+
+	// write file
+	c = vtcachealloc(z, Blocksize, 32);
+	if(c == nil)
+		sysfatal("vtcachealloc: %r");
+	f = vtfilecreateroot(c, Blocksize, Blocksize, VtDataType);
+	if(f == nil)
+		sysfatal("vtfilecreateroot: %r");
+	off = 0;
+	vtfilelock(f, VtOWRITE);
+	while((n = read(0, buf, Blocksize)) > 0){
+		if(vtfilewrite(f, buf, n, off) != n)
+			sysfatal("vtfilewrite: %r");
+		off += n;
+		if(vtfileflushbefore(f, off) < 0)
+			sysfatal("vtfileflushbefore: %r");
+	}
+	if(vtfileflush(f) < 0)
+		sysfatal("vtfileflush: %r");
+	if(vtfilegetentry(f, &e) < 0)
+		sysfatal("vtfilegetentry: %r");
+	vtfileunlock(f);
+	
+	// write directory entry
+	memset(&root, 0, sizeof root);
+	vtentrypack(&e, buf, 0);
+	if(vtwrite(z, root.score, VtDirType, buf, VtEntrySize) < 0)
+		sysfatal("vtwrite dir: %r");
+	
+	// write root
+	strcpy(root.name, "data");
+	strcpy(root.type, "file");
+	root.blocksize = Blocksize;
+	vtrootpack(&root, buf);
+	if(vtwrite(z, score, VtRootType, buf, VtRootSize) < 0)
+		sysfatal("vtwrite root: %r");
+	
+	print("file:%V\n", score);
+	threadexitsall(0);
+}
+