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-rw-r--r--libbb/in_ether.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/libbb/in_ether.c b/libbb/in_ether.c
new file mode 100644
index 000000000..dadadbafe
--- /dev/null
+++ b/libbb/in_ether.c
@@ -0,0 +1,58 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ */
+
+//kbuild:lib-$(CONFIG_IFCONFIG) += in_ether.o
+//kbuild:lib-$(CONFIG_IFENSLAVE) += in_ether.o
+
+#include "libbb.h"
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+
+/* Convert Ethernet address from "XX[:]XX[:]XX[:]XX[:]XX[:]XX" to sockaddr.
+ * Return nonzero on error.
+ */
+int FAST_FUNC in_ether(const char *bufp, struct sockaddr *sap)
+{
+ char *ptr;
+ int i, j;
+ unsigned char val;
+ unsigned char c;
+
+ sap->sa_family = ARPHRD_ETHER;
+ ptr = (char *) sap->sa_data;
+
+ i = ETH_ALEN;
+ goto first;
+ do {
+ /* We might get a semicolon here */
+ if (*bufp == ':')
+ bufp++;
+ first:
+ j = val = 0;
+ do {
+ c = *bufp;
+ if (((unsigned char)(c - '0')) <= 9) {
+ c -= '0';
+ } else if ((unsigned char)((c|0x20) - 'a') <= 5) {
+ c = (unsigned char)((c|0x20) - 'a') + 10;
+ } else {
+ if (j && (c == ':' || c == '\0'))
+ /* One-digit byte: __:X:__ */
+ break;
+ return -1;
+ }
+ ++bufp;
+ val <<= 4;
+ val += c;
+ j ^= 1;
+ } while (j);
+
+ *ptr++ = val;
+
+ } while (--i);
+
+ /* Error if we aren't at end of string */
+ return *bufp;
+}