Output strings from echo with puts where easy

Change echo to puts characters together where it knows about them
together.  This improves netconsole performance by greatly reducing
the number of packets that are sent.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

1 files changed, 21 insertions, 7 deletions

diff --git a/common/cmd_echo.c b/common/cmd_echo.c
index 43a6da5..1e499fb 100644
--- a/common/cmd_echo.c
+++ b/common/cmd_echo.c
@@ -30,17 +30,31 @@ int do_echo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	int putnl = 1;
 
 	for (i = 1; i < argc; i++) {
-		char *p = argv[i], c;
+		char *p = argv[i];
+		char *nls; /* new-line suppression */
 
 		if (i > 1)
 			putc(' ');
-		while ((c = *p++) != '\0') {
-			if (c == '\\' && *p == 'c') {
-				putnl = 0;
-				p++;
-			} else {
-				putc(c);
+
+		nls = strstr(p, "\\c");
+		if (nls) {
+			char *prenls = p;
+
+			putnl = 0;
+			/*
+			 * be paranoid and guess that someone might
+			 * say \c more than once
+			 */
+			while (nls) {
+				*nls = '\0';
+				puts(prenls);
+				*nls = '\\';
+				prenls = nls + 2;
+				nls = strstr(prenls, "\\c");
 			}
+			puts(prenls);
+		} else {
+			puts(p);
 		}
 	}