ungetc(3p) - phpMan

UNGETC(P)                                                            UNGETC(P)



NAME
       ungetc - push byte back into input stream

SYNOPSIS
       #include <stdio.h>

       int ungetc(int c, FILE *stream);


DESCRIPTION
       The  ungetc() function shall push the byte specified by c (converted to an unsigned
       char) back onto the input stream pointed to by stream. The pushed-back bytes  shall
       be  returned by subsequent reads on that stream in the reverse order of their push-
       ing. A successful intervening call (with the stream pointed  to  by  stream)  to  a
       file-positioning  function  (  fseek(),  fsetpos(),  or rewind()) shall discard any
       pushed-back bytes for the stream. The external storage corresponding to the  stream
       shall be unchanged.

       One  byte  of  push-back shall be provided. If ungetc() is called too many times on
       the same stream without an intervening read or file-positioning operation  on  that
       stream, the operation may fail.

       If  the  value  of c equals that of the macro EOF, the operation shall fail and the
       input stream shall be left unchanged.

       A successful call to ungetc() shall clear the end-of-file indicator for the stream.
       The value of the file-position indicator for the stream after reading or discarding
       all pushed-back bytes shall be the same as it was  before  the  bytes  were  pushed
       back.  The  file-position  indicator  is  decremented  by  each  successful call to
       ungetc(); if its value was 0 before a call, its  value  is  unspecified  after  the
       call.

RETURN VALUE
       Upon  successful  completion, ungetc() shall return the byte pushed back after con-
       version. Otherwise, it shall return EOF.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fseek() , getc() , fsetpos() , read() , rewind() , setbuf() , the Base  Definitions
       volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information  Technology  --  Portable  Operating
       System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
       2001-2003 by the Institute of Electrical and Electronics  Engineers,  Inc  and  The
       Open  Group.  In the event of any discrepancy between this version and the original
       IEEE and The Open Group Standard, the original IEEE and The Open Group Standard  is
       the   referee   document.   The   original  Standard  can  be  obtained  online  at
       http://www.opengroup.org/unix/online.html .



POSIX                                2003                            UNGETC(P)

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