4.4BSD/usr/share/man/cat3/ungetc.0

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UNGETC(3)                   BSD Programmer's Manual                  UNGETC(3)

NNAAMMEE
     uunnggeettcc - un-get character from input stream

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssttddiioo..hh>>

     _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