[PATCH iproute2 net-next v2 1/6] utils: Implement get_s64()

[Vinicius Costa Gomes <vinicius.gomes@intel.com>]

Add this helper to read signed 64-bit integers from a string.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
---
 include/utils.h |  1 +
 lib/utils.c     | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/utils.h b/include/utils.h
index 8cb4349e..58574a05 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -139,6 +139,7 @@ int get_time_rtt(unsigned *val, const char *arg, int *raw);
 #define get_byte get_u8
 #define get_ushort get_u16
 #define get_short get_s16
+int get_s64(__s64 *val, const char *arg, int base);
 int get_u64(__u64 *val, const char *arg, int base);
 int get_u32(__u32 *val, const char *arg, int base);
 int get_s32(__s32 *val, const char *arg, int base);
diff --git a/lib/utils.c b/lib/utils.c
index e87ecf31..1b84b801 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -383,6 +383,27 @@ int get_u8(__u8 *val, const char *arg, int base)
 	return 0;
 }
 
+int get_s64(__s64 *val, const char *arg, int base)
+{
+	long res;
+	char *ptr;
+
+	errno = 0;
+
+	if (!arg || !*arg)
+		return -1;
+	res = strtoll(arg, &ptr, base);
+	if (!ptr || ptr == arg || *ptr)
+		return -1;
+	if ((res == LLONG_MIN || res == LLONG_MAX) && errno == ERANGE)
+		return -1;
+	if (res > INT64_MAX || res < INT64_MIN)
+		return -1;
+
+	*val = res;
+	return 0;
+}
+
 int get_s32(__s32 *val, const char *arg, int base)
 {
 	long res;
-- 
2.19.0