X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/rigol/blobdiff_plain/e8e713c3a536c59f94d6402d852f353e34fac2de..7ba4ad35ccc80799826d9ade4c6eea79d0ca5843:/rigol.c

diff --git a/rigol.c b/rigol.c
index 818b7ea..0e9ff9e 100644
--- a/rigol.c
+++ b/rigol.c
@@ -306,6 +306,7 @@ void do_get_screen(struct usb_dev_handle *sc)
 	char filename[256];
 	unsigned char *png;
 	int imglen;
+	int ret;
 	int l;
 	int fd;
 	pid_t display;
@@ -320,11 +321,26 @@ void do_get_screen(struct usb_dev_handle *sc)
 		printf ("hmm. didnt' get %d bytes, but %d\n\n", sizeof(screen), l); 
 	}
 
+	png = lcd2png(screen, &imglen);
+
+	lt = time(NULL);
 	strftime(filename, sizeof(filename), "screen_%Y%m%d-%H%M%S.png", localtime(&lt));
 	fd=open(filename, O_CREAT|O_WRONLY, 0644);
-	png = lcd2png(screen, &imglen);
-	write(fd, png, imglen);
+	if (fd == -1) {
+		perror("open");
+		exit(EXIT_FAILURE);
+	}
+
+	while(imglen > 0) {
+		ret = write(fd, png, imglen);
+		if (ret == -1) {
+			perror("write");
+			exit(EXIT_FAILURE);
+		}
+		imglen -= ret;
+	}
 	close(fd);
+	free(png);
 
 	printf("Waveform saved as %s\n", filename);