Import sources from 2011-03-30 iso image

1 files changed, 57 insertions, 0 deletions

diff --git a/sys/src/cmd/aux/rdwr.c b/sys/src/cmd/aux/rdwr.c
new file mode 100755
index 000000000..480e042e0
--- /dev/null
+++ b/sys/src/cmd/aux/rdwr.c
@@ -0,0 +1,57 @@
+#include <u.h>
+#include <libc.h>
+
+int wrrd;
+
+void
+usage(void)
+{
+	fprint(2, "usage: rdwr [-w] file\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int fd;
+	char buf[8192];
+	int n;
+
+	ARGBEGIN{
+	case 'w':
+		wrrd = 1;
+		break;
+	default:
+		usage();
+	}ARGEND;
+
+	if(argc != 1)
+		usage();
+
+	if((fd = open(argv[0], ORDWR)) < 0)
+		sysfatal("open: %r");
+
+	if(wrrd){
+		n = read(fd, buf, sizeof buf);
+		if(n < 0)
+			fprint(2, "read error: %r\n");
+		else{
+			write(1, buf, n);
+			print("\n");
+		}
+	}
+
+	while(print("> "), (n = read(0, buf, 1000)) > 0) {
+		seek(fd, 0, 0);
+		if(write(fd, buf, n-1) != n-1)	/* n-1: no newline */
+			fprint(2, "write error: %r\n");
+		seek(fd, 0, 0);
+		n = read(fd, buf, sizeof buf);
+		if(n < 0)
+			fprint(2, "read error: %r\n");
+		else{
+			write(1, buf, n);
+			print("\n");
+		}
+	}
+}