refactor(printf): changed oprintf() to fctprintf()

fctprintf() is more descriptive for its operation

README.md

@@ -51,8 +51,8 @@ int sprintf(char* buffer, const char* format, ...);
 int snprintf(char* buffer, size_t count, const char* format, ...);
 int vsnprintf(char* buffer, size_t count, const char* format, va_list va);
 
-// write to output function (instead of buffer)
+// call output function (instead of buffer)
-int oprintf(void (*out)(char character), const char* format, ...);
+int fctprintf(void (*out)(char character), const char* format, ...);
 ```
 
 

printf.c

@@ -691,7 +691,7 @@ int vsnprintf(char* buffer, size_t count, const char* format, va_list va)
 }
 
 
-int oprintf(void (*out)(char character), const char* format, ...)
+int fctprintf(void (*out)(char character), const char* format, ...)
 {
   va_list va;
   va_start(va, format);

printf.h

@@ -87,7 +87,7 @@ int vsnprintf(char* buffer, size_t count, const char* format, va_list va);
  * \param format A string that specifies the format of the output
  * \return The number of characters that are sent to the output function, not counting the terminating null character
  */
-int oprintf(void (*out)(char character), const char* format, ...);
+int fctprintf(void (*out)(char character), const char* format, ...);
 
 
 #ifdef __cplusplus

test/test_suite.cpp

@@ -57,10 +57,10 @@ TEST_CASE("printf", "[]" ) {
 }
 
 
-TEST_CASE("oprintf", "[]" ) {
+TEST_CASE("fctprintf", "[]" ) {
   printf_idx = 0U;
   memset(printf_buffer, 0xCC, 100U);
-  test::oprintf(&test::_putchar, "This is a test of %X", 0x12EFU);
+  test::fctprintf(&test::_putchar, "This is a test of %X", 0x12EFU);
   REQUIRE(!strcmp(printf_buffer, "This is a test of 12EF"));
 }