CTL_STATUS_t ctl_ms_fputc(CTL_STREAM_t s, int ch);
ctl_ms_fputc writes the character ch to the file f. The character is written without any translation which means that the C character, '\n', for instance, is not translated to a CR, LF sequence on output.
ctl_ms_fputc returns a standard status code.
ctl_ms_fputc is thread-safe.