From 390d0ab52527b0410b7b52afb81c44a360c420f4 Mon Sep 17 00:00:00 2001
From: Philippe Teuwen <phil@teuwen.org>
Date: Fri, 25 Oct 2019 00:53:56 +0200
Subject: [PATCH] lf tune: allow float, added parse_getfloat to utils

---
 client/cmdlf.c | 6 +++---
 client/util.c  | 8 ++++++++
 client/util.h  | 1 +
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/client/cmdlf.c b/client/cmdlf.c
index 8f5a88923..328af5e29 100644
--- a/client/cmdlf.c
+++ b/client/cmdlf.c
@@ -231,12 +231,12 @@ int CmdLFTune(const char *Cmd) {
                 }
                 break;
             case 'f': {
-                int freq = param_get32ex(Cmd, cmdp + 1, 125, 10);
-                divisor = LF_FREQ2DIV(freq);
-                if (divisor < 19) {
+                float freq = param_getfloat(Cmd, cmdp + 1, 125);
+                if ((freq < 47) || (freq > 600)) {
                     PrintAndLogEx(ERR, "freq must be between 47 and 600");
                     return PM3_EINVARG;
                 }
+                divisor = LF_FREQ2DIV(freq);
                 cmdp += 2;
                 break;
             }
diff --git a/client/util.c b/client/util.c
index da1b5d0e2..58dce8eca 100644
--- a/client/util.c
+++ b/client/util.c
@@ -551,6 +551,14 @@ uint64_t param_get64ex(const char *line, int paramnum, int deflt, int base) {
         return deflt;
 }
 
+float param_getfloat(const char *line, int paramnum, float deflt) {
+    int bg, en;
+    if (!param_getptr(line, &bg, &en, paramnum))
+        return strtof(&line[bg], NULL);
+    else
+        return deflt;
+}
+
 int param_gethex(const char *line, int paramnum, uint8_t *data, int hexcnt) {
     int bg, en, i;
     uint32_t temp;
diff --git a/client/util.h b/client/util.h
index 7d6c6460e..d549458c4 100644
--- a/client/util.h
+++ b/client/util.h
@@ -68,6 +68,7 @@ uint8_t param_get8(const char *line, int paramnum);
 uint8_t param_get8ex(const char *line, int paramnum, int deflt, int base);
 uint32_t param_get32ex(const char *line, int paramnum, int deflt, int base);
 uint64_t param_get64ex(const char *line, int paramnum, int deflt, int base);
+float param_getfloat(const char *line, int paramnum, float deflt);
 uint8_t param_getdec(const char *line, int paramnum, uint8_t *destination);
 uint8_t param_isdec(const char *line, int paramnum);
 int param_gethex(const char *line, int paramnum, uint8_t *data, int hexcnt);