feat(printf): added new oprintf() function

Write formatted output directly to given output function

1 files changed, 19 insertions, 1 deletions

diff --git a/printf.c b/printf.c
index f1a51e2..0b94d4a 100644
--- a/printf.c
+++ b/printf.c
@@ -101,6 +101,14 @@ static inline void _out_char(char character, char* buffer, size_t idx, size_t ma
 }

 

 

+// internal output function wrapper

+static inline void _out_fct(char character, char* buffer, size_t idx, size_t maxlen)

+{

+  (void)idx; (void)maxlen;

+  ((void (*)(char character))buffer)(character);  // buffer is the output fct pointer

+}

+

+

 // internal strlen

 // \return The length of the string (excluding the terminating 0)

 static inline unsigned int _strlen(const char* str)

@@ -674,7 +682,17 @@ int snprintf(char* buffer, size_t count, const char* format, ...)
 }

 

 

-inline int vsnprintf(char* buffer, size_t count, const char* format, va_list va)

+int vsnprintf(char* buffer, size_t count, const char* format, va_list va)

 {

   return _vsnprintf(_out_buffer, buffer, count, format, va);

 }

+

+

+int oprintf(void (*out)(char character), const char* format, ...)

+{

+  va_list va;

+  va_start(va, format);

+  const int ret = _vsnprintf(_out_fct, (char*)out, (size_t)-1, format, va);

+  va_end(va);

+  return ret;

+}