UNGETC(3S)          UNIX Programmer's Manual           UNGETC(3S)

NAME
     ungetc - push character back into input stream

SYNOPSIS
     #include <stdio.h>

     int ungetc (c, stream)
     char c;
     FILE *stream;

HP-UX COMPATIBILITY
     Level:    HP-UX/RUN ONLY

     Origin:   System V

DESCRIPTION
     _U_n_g_e_t_c pushes the character _c back on an input stream.  That
     character  will  be  returned  by the next _g_e_t_c call on that
     stream.  _U_n_g_e_t_c returns EOF on error, zero on success.

     One character of pushback is guaranteed  provided  something
     has  been  read  from  the stream and the stream is actually
     buffered.  Attempts to push EOF are rejected.

     _F_s_e_e_k(3S) erases all memory of pushed back characters.

SEE ALSO
     fseek(3S), getc(3S), setbuf(3S).

DIAGNOSTICS
     _U_n_g_e_t_c returns EOF if it cannot push a character back.