UNGETC(3) BSD Programmer's Manual UNGETC(3) NNAAMMEE uunnggeettcc - un-get character from input stream SSYYNNOOPPSSIISS ##iinncclluuddee <> _i_n_t uunnggeettcc(_i_n_t _c, _F_I_L_E _*_s_t_r_e_a_m); DDEESSCCRRIIPPTTIIOONN The uunnggeettcc() function pushes the character _c (converted to an unsigned char) back onto the input stream pointed to by _s_t_r_e_a_m. The pushed-backed characters will be returned by subsequent reads on the stream (in reverse order). A successful intervening call, using the same stream, to one of the file positioning functions (fseek(3), fsetpos(3), or rewind(3)) will discard the pushed back characters. One character of push-back is guaranteed, but as long as there is suffi- cient memory, an effectively infinite amount of pushback is allowed. If a character is successfully pushed-back, the end-of-file indicator for the stream is cleared. RREETTUURRNN VVAALLUUEESS The uunnggeettcc() function returns the character pushed-back after the conver- sion, or EOF if the operation fails. If the value of the argument _c character equals EOF, the operation will fail and the stream will remain unchanged. SSEEEE AALLSSOO getc(3), fseek(3), setvbuf(3) SSTTAANNDDAARRDDSS The uunnggeettcc() function conforms to ANSI C X3.159-1989 (``ANSI C ''). 4.4BSD June 4, 1993 1