Add sprintf to minimal-printf implementation

Author: bulislaw

TESTS/mbed_platform/minimal-printf/compliance/mbed_printf.c

@@ -39,6 +39,16 @@ int mbed_snprintf(char *buffer, size_t length, const char *format, ...)
     return result;
 }
 
+int mbed_sprintf(char *buffer, const char *format, ...)
+{
+    va_list arguments;
+    va_start(arguments, format);
+    int result = mbed_minimal_formatted_string(buffer, LONG_MAX, format, arguments, NULL);
+    va_end(arguments);
+
+    return result;
+}
+
 int mbed_vprintf(const char *format, va_list arguments)
 {
     return mbed_minimal_formatted_string(NULL, LONG_MAX, format, arguments, stdout);

TESTS/mbed_platform/minimal-printf/compliance/mbed_printf.h

@@ -38,6 +38,13 @@ int mbed_printf(const char *format, ...);
  */
 int mbed_snprintf(char *buffer, size_t length, const char *format, ...);
 
+/**
+ * Minimal snprintf
+ *
+ * Prints directly to buffer without using malloc.
+ */
+int mbed_sprintf(char *buffer, const char *format, ...);
+
 /**
  * Minimal printf
  *