utils: add and use iwinfo_format_hwmodes()

[project/iwinfo.git] / iwinfo_utils.c

diff --git a/iwinfo_utils.c b/iwinfo_utils.c
index c15b30517235ed0b34997922141a2b3467352cf7..63ae78c4715d875613da417c928347044c37d237 100644 (file)
--- a/iwinfo_utils.c
+++ b/iwinfo_utils.c
@@ -77,6 +77,31 @@ int iwinfo_mw2dbm(int in)
        return (int)res;
 }
 
+size_t iwinfo_format_hwmodes(int modes, char *buf, size_t len)
+{
+       // bit numbers as per IWINFO_80211_*:  ad ac ax  a  b  g  n
+       const int order[IWINFO_80211_COUNT] = { 5, 4, 6, 0, 1, 2, 3 };
+       size_t res = 0;
+       int i;
+
+       *buf = 0;
+
+       if (!(modes & ((1 << IWINFO_80211_COUNT) - 1)))
+               return 0;
+
+       for (i = 0; i < IWINFO_80211_COUNT; i++)
+               if (modes & 1 << order[i])
+                       res += snprintf(buf + res, len - res, "%s/", IWINFO_80211_NAMES[order[i]]);
+
+       if (res > 0)
+       {
+               res--;
+               buf[res] = 0;
+       }
+
+       return res;
+}
+
 int iwinfo_ifup(const char *ifname)
 {
        struct ifreq ifr;