Updated readme

README.md

@@ -1,31 +1,41 @@
 # printf / sprintf for embedded systems
 
 This is a tiny but fully loaded printf, sprintf and snprintf implementation.  
-Primary designed for usage in embedded systems, where printf is not available due to memory issues or in avoidance of linking against libc.  
-Using the standard libc printf may pull a lot of unwanted library stuff. In this case the following implementation can be used.  
+Primarily designed for usage in embedded systems, where printf is not available due to memory issues or in avoidance of linking against libc.  
+Using the standard libc printf may pull a lot of unwanted library stuff and can bloat code size about 20k. In this case the following implementation can be used.  
 Absolutely **NO dependencies** are required, printf.cpp brings all necessary routines, even its own fast ftoa conversion.
 
-If memory footprint is really an issue the floating point support can be turned off via the `PRINTF_FLOAT_SUPPORT` compiler switch.
-
+If memory footprint is really a critical issue, floating point support can be turned off via the `PRINTF_FLOAT_SUPPORT` compiler switch.
 When using printf (instead of sprintf) you have to provide your own `_putchar()` low level function as console output.
 
+
 ## Design goals
 
+There is a boatload of so called 'tiny' printf implementations around. So why this one?  
+I tested many implementations, but most of them have very limited flag/specifier support, a lot of other dependencies or are just not standard compliant and failing the test suite.
+Therefore I decided to write an own implementation which meets the following items:
+
+ - Very small implementation (< 500 code lines)
  - NO dependencies, no libs, just one module file
- - Support of all flags, width and precision sub-specifiers
+ - Support of all important flags, width and precision sub-specifiers (see below)
+ - Support of float number representation (with an own fast ftoa)
  - Reentrant and thread-safe, malloc free
  - LINT and compiler L4 warning free, clean code
- - Extensive passing test suite
+ - Extensive test suite passing
  - MIT license
 
 
 ## Usage
-This is 1:1 like the according stdio.h library version:  
+
+Add/link `printf.cpp` to your project and include `printf.h`. That's it.  
+Usage is 1:1 like the according stdio.h library version:  
 
 `int printf(const char* format, ...);`  
 `int sprintf(char* buffer, const char* format, ...);`  
 `int snprintf(char* buffer, size_t count, const char* format, ...);`  
 
+**Due to genaral security reasons it is highly recommended to use snprintf (with the max buffer size as `count` parameter) only.**  
+
 
 ## Format specifiers