In u-boot printf has been extended with the %pM formatter to allow printing of MAC addresses. However buffers that want to store a MAC address cannot safely get the size. Add a define for this case so the string of a MAC address can be reliably obtained.
Signed-off-by: Olliver Schinagl oliver@schinagl.nl --- include/net.h | 5 +++++ net/eth_common.c | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/net.h b/include/net.h index 8137cf3..af0558d 100644 --- a/include/net.h +++ b/include/net.h @@ -40,6 +40,11 @@
/* ARP hardware address length */ #define ARP_HLEN 6 +/* + * The size of a MAC address in string form, each digit requires two chars + * and five separator characters to form '00:00:00:00:00:00'. + */ +#define ARP_HLEN_ASCII (ARP_HLEN * 2) + (ARP_HLEN - 1)
/* IPv4 addresses are always 32 bits in size */ struct in_addr { diff --git a/net/eth_common.c b/net/eth_common.c index 2880901..e9d3c66 100644 --- a/net/eth_common.c +++ b/net/eth_common.c @@ -32,7 +32,7 @@ int eth_getenv_enetaddr(const char *name, uchar *enetaddr)
int eth_setenv_enetaddr(const char *name, const uchar *enetaddr) { - char buf[20]; + char buf[ARP_HLEN_ASCII + 1];
sprintf(buf, "%pM", enetaddr);