[PATCH 1/4] string: add isempty helper

[Marco Felsch <m.felsch@pengutronix.de>]

This adds systemd's isempty() helper which can be very handy.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 include/string.h | 2 ++
 lib/string.c     | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/string.h b/include/string.h
index 43911b75762f..ffe7c42d3093 100644
--- a/include/string.h
+++ b/include/string.h
@@ -20,4 +20,6 @@ char *parse_assignment(char *str);
 
 int strverscmp(const char *a, const char *b);
 
+bool isempty(const char *s);
+
 #endif /* __STRING_H */
diff --git a/lib/string.c b/lib/string.c
index bf0f0455ab3f..20e6947347de 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -1000,3 +1000,9 @@ char *parse_assignment(char *str)
 
 	return value;
 }
+
+bool isempty(const char *s)
+{
+	return !s || s[0] == '\0';
+}
+EXPORT_SYMBOL(isempty);
-- 
2.39.2