klibc - Mar 2020 - [klibc:update-dash] dash: builtin: Fix echo -n early termination

Commit-ID:  58ad7304f64a22cb58cdf6f45582e7f9d30aa89d
Gitweb:    
http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=58ad7304f64a22cb58cdf6f45582e7f9d30aa89d
Author:     Herbert Xu <herbert at gondor.apana.org.au>
AuthorDate: Fri, 2 Sep 2016 21:14:39 +0800
Committer:  Ben Hutchings <ben at decadent.org.uk>
CommitDate: Sat, 28 Mar 2020 21:42:54 +0000

[klibc] dash: builtin: Fix echo -n early termination

[ dash commit 4cf38c1ccd0c41715633c1b724c30e9c235099d1 ]

The commit 7a784244625d5489c0fc779201c349555dc5f8bc ("[BUILTIN]
Simplify echo command") broke echo -n by making it always terminate
after printing the first argument.

This patch fixes this by only terminating when we have reached
the end of the arguments.

Fixes: 7a784244625d ("[BUILTIN] Simplify echo command")
Reported-by: Luigi Tarenga <luigi.tarenga at gmail.com>
Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
Signed-off-by: Ben Hutchings <ben at decadent.org.uk>

---
 usr/dash/bltin/printf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usr/dash/bltin/printf.c b/usr/dash/bltin/printf.c
index 78bf388a..9da4ffef 100644
--- a/usr/dash/bltin/printf.c
+++ b/usr/dash/bltin/printf.c
@@ -465,7 +465,7 @@ echocmd(int argc, char **argv)
 
 		if (likely(*argv))
 			nonl += print_escape_str("%s", NULL, NULL, *argv++);
-		if (nonl > 0)
+		if (likely((nonl + !*argv) > 1))
 			break;
 
 		c = *argv ? ' ' : '\n';