fix(printf): use C conform `NULL` instead of C++ `nullptr`

Fixes #14

2 files changed, 6 insertions, 5 deletions

diff --git a/README.md b/README.md
index 5d03f03..1e2af49 100644
--- a/README.md
+++ b/README.md
@@ -52,10 +52,6 @@ int snprintf(char* buffer, size_t count, const char* format, ...);
 int vsnprintf(char* buffer, size_t count, const char* format, va_list va);

 ```

 

-If `buffer` is set to `nullptr` nothing is written and just the formatted length is returned.

-```C

-int length = sprintf(nullptr, "Hello, world"); // length is set to 12

-```

 

 **Due to genaral security reasons it is highly recommended to prefer and use `snprintf` (with the max buffer size as `count` parameter) instead of `sprintf`.**  

 `sprintf` has no buffer limitation, so when needed - use it really with care!

@@ -136,6 +132,11 @@ Notice that a value equal or larger than `count` indicates a truncation. Only wh
 the string has been completely written.  

 If any error is encountered, `-1` is returned.

 

+If `buffer` is set to `NULL` (`nullptr`) nothing is written and just the formatted length is returned.

+```C

+int length = sprintf(NULL, "Hello, world"); // length is set to 12

+```

+

 

 ## Compiler switches/defines

 

diff --git a/printf.c b/printf.c
index 8fe7048..56f60d6 100644
--- a/printf.c
+++ b/printf.c
@@ -647,7 +647,7 @@ int printf(const char* format, ...)
 {

   va_list va;

   va_start(va, format);

-  const int ret = _vsnprintf(_out_char, nullptr, (size_t)-1, format, va);

+  const int ret = _vsnprintf(_out_char, NULL, (size_t)-1, format, va);

   va_end(va);

   return ret;

 }