[PATCH 1/2] misc: introduce string_to_bin

[Baruch Siach]

Factor out string_to_bin from string_to_ethaddr. string_to_bin is useful for
other hex data strings.

Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
 include/common.h |    1 +
 lib/misc.c       |   29 +++++++++++++++++++++++++++++
 net/net.c        |   17 +----------------
 3 files changed, 31 insertions(+), 16 deletions(-)

diff --git a/include/common.h b/include/common.h
index 0edc778..f600eb0 100644
--- a/include/common.h
+++ b/include/common.h
@@ -127,6 +127,7 @@ struct memarea_info {
 
 int spec_str_to_info(const char *str, struct memarea_info *info);
 int parse_area_spec(const char *str, ulong *start, ulong *size);
+int string_to_bin(const char *str, u8 *buf, unsigned int buflen);
 
 /* Just like simple_strtoul(), but this one honors a K/M/G suffix */
 unsigned long strtoul_suffix(const char *str, char **endp, int base);
diff --git a/lib/misc.c b/lib/misc.c
index 549b960..7735725 100644
--- a/lib/misc.c
+++ b/lib/misc.c
@@ -107,3 +107,32 @@ int parse_area_spec(const char *str, ulong *start, ulong *size)
 	return -1;
 }
 EXPORT_SYMBOL(parse_area_spec);
+
+/*
+ * This function parses strings in the form "xx:xx:xx...", where x is an
+ * hexadecimal digit.
+ */
+int string_to_bin(const char *str, u8 *buf, unsigned int buflen)
+{
+	int i;
+	char *e;
+
+	if (!str || strlen(str) != buflen*3 - 1)
+		return -1;
+
+	for (i = 0; i < buflen-1; i++)
+		if (str[i*3 + 2] != ':')
+			return -1;
+
+	for (i = 0; str[i]; i++)
+		if (!isxdigit(str[i]) && !(str[i] == ':'))
+			return -1;
+
+	for (i = 0; i < buflen; i++) {
+		buf[i] = simple_strtoul(str, &e, 16);
+		str = e + 1;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(string_to_bin);
diff --git a/net/net.c b/net/net.c
index 8d99595..017de8b 100644
--- a/net/net.c
+++ b/net/net.c
@@ -161,22 +161,7 @@ void print_IPaddr (IPaddr_t x)
 
 int string_to_ethaddr(const char *str, char *enetaddr)
 {
-	int reg;
-	char *e;
-
-        if (!str || strlen(str) != 17)
-                return -1;
-
-        if (str[2] != ':' || str[5] != ':' || str[8] != ':' ||
-                        str[11] != ':' || str[14] != ':')
-                return -1;
-
-	for (reg = 0; reg < 6; ++reg) {
-		enetaddr[reg] = simple_strtoul (str, &e, 16);
-			str = e + 1;
-	}
-
-	return 0;
+	return string_to_bin(str, enetaddr, 6);
 }
 
 void ethaddr_to_string(const unsigned char *enetaddr, char *str)
-- 
1.7.1