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>

diff --git a/common/cmd_echo.c b/common/cmd_echo.c
index 43a6da57226f5696a5de0824807793521763226c..1e499fb0db93116b41c6ca7922bf78cee2ab71c5 100644 (file)
--- 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);
                }
        }