UNGETC(3) BSD Library Functions Manual UNGETC(3)

NAME
     uunnggeettcc - un-get character from input stream

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     int
     uunnggeettcc(int c, FILE *stream);

DESCRIPTION
     The uunnggeettcc() function pushes the character c (converted to an unsigned
     char) back onto the input stream pointed to by stream.  The pushed-back
     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.  The file-position indicator is decremented by
     each successful call to uunnggeettcc(); if its value was 0 before a call, its
     value is unspecified after the call.

RETURN VALUES
     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.

SEE ALSO
     fseek(3), getc(3), setvbuf(3), ungetwc(3)

STANDARDS     The uunnggeettcc() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD                              June 4, 1993                              BSD