f: clearerr fclose feof ferror fflush fgetc fgetpos fgets fopen fprintf fputc fputs fread freopen fscanf fseek fsetpos ftell fwrite getc getchar gets perror printf putc putchar puts remove rename rewind scanf setbuf setvbuf sprintf sscanf tempnam tmpfile tmpnam ungetc vfprintf vprintf vsprintf v: _IOFBF _IOLBF _IONBF BUFSIZ EOF FILENAME_MAX FOPEN_MAX L_tmpnam NULL SEEK_CUR SEEK_END SEEK_SET TMP_MAX stderr stdin stdout t: FILE fpos_t size_t