From e084781afc99075c4154614b49d99d3308d8c8ee Mon Sep 17 00:00:00 2001 From: Andre Heider Date: Tue, 22 Nov 2022 09:45:23 +0100 Subject: utils: add helper functions to get names by values Some defines/enums use bits, while some functions only set a single one. Make it less painful to get to a name for those. This avoids hardcoding bit lists for consumers. Signed-off-by: Andre Heider --- include/iwinfo/utils.h | 3 +++ iwinfo_utils.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+) diff --git a/include/iwinfo/utils.h b/include/iwinfo/utils.h index e9b8f1d..a7645de 100644 --- a/include/iwinfo/utils.h +++ b/include/iwinfo/utils.h @@ -43,6 +43,9 @@ static inline int iwinfo_mbm2dbm(int gain) return gain / 100; } +const char * const iwinfo_band_name(int mask); +const char * const iwinfo_htmode_name(int mask); + size_t iwinfo_format_hwmodes(int modes, char *buf, size_t len); int iwinfo_htmode_is_ht(int htmode); int iwinfo_htmode_is_vht(int htmode); diff --git a/iwinfo_utils.c b/iwinfo_utils.c index c7713ed..83f049a 100644 --- a/iwinfo_utils.c +++ b/iwinfo_utils.c @@ -77,6 +77,44 @@ int iwinfo_mw2dbm(int in) return (int)res; } +static int iwinfo_bit(int value, int max) +{ + int i; + + if (max > 31 || !(value & ((1 << max) - 1))) + return -1; + + for (i = 0; i < max; i++) + { + if (value & 1) + break; + + value >>= 1; + } + + return i; +} + +static const char * const iwinfo_name(int mask, int max, const char * const names[]) +{ + int index = iwinfo_bit(mask, max); + + if (index < 0) + return NULL; + + return names[index]; +} + +const char * const iwinfo_band_name(int mask) +{ + return iwinfo_name(mask, IWINFO_BAND_COUNT, IWINFO_BAND_NAMES); +} + +const char * const iwinfo_htmode_name(int mask) +{ + return iwinfo_name(mask, IWINFO_HTMODE_COUNT, IWINFO_HTMODE_NAMES); +} + 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 -- cgit v1.2.1