commands: time: refactor into new strjoin

time concatenates all its remaining arguments with a space in-between
and then passes that to the command executor. This can be useful
elsewhere as well, so factor it out into a new strjoin function.

No functional change.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20240304190038.3486881-49-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/lib/string.c b/lib/string.c
index bf0f0455ab..695e50bc8f 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -1000,3 +1000,31 @@ char *parse_assignment(char *str)
 
 	return value;
 }
+
+char *strjoin(const char *separator, char **arr, size_t arrlen)
+{
+	size_t separatorlen;
+	int len = 1; /* '\0' */
+	char *buf, *p;
+	int i;
+
+	separatorlen = strlen(separator);
+
+	for (i = 0; i < arrlen; i++)
+		len += strlen(arr[i]) + separatorlen;
+
+	if (!arrlen)
+		return xzalloc(1);
+
+	p = buf = xmalloc(len);
+
+	for (i = 0; i < arrlen - 1; i++) {
+		p = stpcpy(p, arr[i]);
+		p = mempcpy(p, separator, separatorlen);
+	}
+
+	stpcpy(p, arr[i]);
+
+	return buf;
+}
+EXPORT_SYMBOL(strjoin);