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ungetc.0
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1996-09-02
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UNGETC(3) UNIX 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 C3.159-1989 (``ANSI C'').
BSD Experimental June 4, 1993 1