usock: add usock_port() for convenient use of numeric ports

Add a new helper function usock_port() which converts the given numeric port number
into a string using a private static buffer. This way a calling application can
conveniently use numeric port arguments without having to convert them before:

  int fd = usock(USOCK_UDP, "example.org", usock_port(80));

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/usock.h b/usock.h
index 5df4362..8345581 100644
--- a/usock.h
+++ b/usock.h
@@ -30,6 +30,7 @@
 #define USOCK_IPV4ONLY		0x4000
 #define USOCK_UNIX		0x8000
 
+const char *usock_port(int port);
 int usock(int type, const char *host, const char *service);
 
 #endif /* USOCK_H_ */