intel-ucode-split: add -n flag to skip creating output files

Sponsored by:	The FreeBSD Foundation

tools/tools/intel-ucode-split/intel-ucode-split.c

@@ -112,7 +112,7 @@ static void
 usage(void)
 {
 
-	printf("ucode-split [-v] microcode_file\n");
+	printf("ucode-split [-nv] microcode_file\n");
 	exit(1);
 }
 
@@ -124,11 +124,14 @@ main(int argc, char *argv[])
 	size_t len, resid;
 	ssize_t rv;
 	int c, ifd, ofd;
-	bool vflag;
+	bool nflag, vflag;
 
-	vflag = false;
-	while ((c = getopt(argc, argv, "v")) != -1) {
+	nflag = vflag = false;
+	while ((c = getopt(argc, argv, "nv")) != -1) {
 		switch (c) {
+		case 'n':
+			nflag = true;
+			break;
 		case 'v':
 			vflag = true;
 			break;
@@ -166,13 +169,24 @@ main(int argc, char *argv[])
 		if (vflag)
 			dump_header(&hdr);
 
+		resid = (hdr.total_size != 0 ? hdr.total_size : 2048) -
+		    sizeof(hdr);
+		if (resid > 1 << 24) /* Arbitrary chosen maximum size. */
+			errx(1, "header total_size too large");
+
+		if (nflag) {
+			if (lseek(ifd, resid, SEEK_CUR) == -1)
+				err(1, "lseek");
+			printf("\n");
+		} else {
 			sig_str = format_signature(hdr.processor_signature);
 			asprintf(&output_file, "%s.%02x", sig_str,
 			    hdr.processor_flags & 0xff);
 			free(sig_str);
 			if (output_file == NULL)
 				err(1, "asprintf");
-		ofd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+			ofd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC,
+			    0600);
 			if (ofd < 0)
 				err(1, "open");
 	
@@ -182,10 +196,6 @@ main(int argc, char *argv[])
 				err(1, "write");
 	
 			/* Copy data. */
-		resid = (hdr.total_size != 0 ? hdr.total_size : 2048) -
-		    sizeof(hdr);
-		if (resid > 1 << 24) /* Arbitrary chosen maximum size. */
-			errx(1, "header total_size too large");
 			while (resid > 0) {
 				len = resid < bufsize ? resid : bufsize;
 				rv = read(ifd, buf, len);
@@ -202,4 +212,5 @@ main(int argc, char *argv[])
 			close(ofd);
 			free(output_file);
 		}
+	}
 }