removing printf, replacing with simple itox

Author: xtruan

README.md

@@ -10,12 +10,12 @@ The goal of this project is to see how much crypto functionality can be brought
 ## How to install on Flipper Zero
 - If you do not have one, download a Flipper Zero firmware to get the `fbt` build tool
 - Plug your Flipper Zero in via USB
-- Copy the contents of this folder into the applications_user folder of your firmware
+- Copy the contents of this folder into the `applications_user` folder of your firmware
 - Modify the `site_scons/cc.scons` file in the Flipper Zero firmware to remove the `"-Wdouble-promotion"` warning and add the `"-Os"` flag
 
 Then run the command: 
  ```
-.\fbt COMPACT=1 DEBUG=0 launch_app APPSRC=applications_user/FlipBIP
+./fbt COMPACT=1 DEBUG=0 launch_app APPSRC=applications_user/FlipBIP
  ```
 The application will be compiled and copied onto your device
 

helpers/flipbip_string.c

@@ -27,7 +27,6 @@
  * SUCH DAMAGE.
  */
 #include "flipbip_string.h"
-// #include <string.h>
 #include <ctype.h>
 char *
 flipbip_strtok(char *s, const char *delim)
@@ -77,67 +76,18 @@ flipbip_strtok_r(char *s, const char *delim, char **last)
 	}
 	/* NOTREACHED */
 }
-/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- * * Redistributions of source code must retain the above copyright
- *  notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- *  with the distribution.
- *   * Neither the name of The Linux Foundation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
- * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-// void
-// flipbip_strrev(unsigned char *str)
-// {
-// 	int i;
-// 	int j;
-// 	unsigned char a;
-// 	unsigned len = strlen((const char *)str);
-// 	for (i = 0, j = len - 1; i < j; i++, j--)
-// 	{
-// 		a = str[i];
-// 		str[i] = str[j];
-// 		str[j] = a;
-// 	}
-// }
-// int
-// flipbip_itoa(int num, unsigned char* str, int len, int base)
-// {
-// 	int sum = num;
-// 	int i = 0;
-// 	int digit;
-// 	if (len == 0)
-// 		return -1;
-// 	do
-// 	{
-// 		digit = sum % base;
-// 		if (digit < 0xA)
-// 			str[i++] = '0' + digit;
-// 		else
-// 			str[i++] = 'A' + digit - 0xA;
-// 		sum /= base;
-// 	}while (sum && (i < (len - 1)));
-// 	if (i == (len - 1) && sum)
-// 		return -1;
-// 	str[i] = '\0';
-// 	flipbip_strrev(str);
-// 	return 0;
-// }
+
+
+void 
+flipbip_itox(uint8_t i, char *str)
+{
+    unsigned char n;
+ 
+    str += 2;
+    *str = '\0';
+ 
+    for (n = 2; n != 0; --n) {
+        *--str = "0123456789abcdef"[i & 0x0F];
+        i >>= 4;
+    }
+}

helpers/flipbip_string.h

@@ -1,4 +1,6 @@
+#include <stdint.h>
+
 char * flipbip_strtok(char *s, const char *delim);
 char * flipbip_strtok_r(char *s, const char *delim, char **last);
-// void flipbip_strrev(unsigned char *str);
-// int flipbip_itoa(int num, unsigned char* str, int len, int base);
+
+void flipbip_itox(uint8_t i, char *str);