UNGETC man page on Tru64

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ungetc(3)							     ungetc(3)

NAME
       ungetc,	ungetwc	 -  Push  a  byte or wide-character code back into the
       input stream

SYNOPSIS
       #include <stdio.h>

       int ungetc(
	       int c,
	       FILE *stream ); #include <wchar.h>

       wint_t ungetwc(
	       wint_t wchar,
	       FILE *stream );

       For the ungetwc() function, application developers may want to  specify
       an  #include  statement	for  <stdio.h> before the one for <wchar.h> if
       programs are being developed for	 multiple  platforms.  The  additional
       #include	 statement  is not required on Tru64 UNIX systems or by ISO or
       X/Open standards, but may be required on other  vendors'	 systems  that
       conform to these standards.

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       ungetc(), ungetwc():  ISO C, XPG4, XPG4-UNIX

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

PARAMETERS
       Specifies  a  byte to be inserted into the input stream.	 Specifies the
       input stream.  Specifies a wide-character code.

DESCRIPTION
       The ungetc() function converts the byte specified by  the  c  parameter
       into  an	 unsigned  char and inserts it into the buffer associated with
       the input stream specified by the stream parameter.   This  causes  the
       next call to the getc() function to return c.

       If the c parameter has a value equal to EOF, the ungetc() function does
       not place anything in the buffer and the input stream is unchanged.

       The ungetwc() function inserts the wide character  specified  by	 wchar
       into  the  buffer  associated with the input stream. The wide character
       may consist of one or more bytes. This causes  the  next	 call  to  the
       getwc() function to return the value of the wchar parameter.

       If  the	ungetwc() wchar parameter is WEOF, the ungetwc() function does
       not place anything in the buffer and the input stream is unchanged.

       A call to one of the file-positioning functions (fseek(), fsetpos(), or
       rewind()),  if it uses the same stream and intervenes between a call to
       ungetc() or ungetwc() and getc() or getwc(), discards any  pushed  back
       bytes  for  the	stream. The value of the file-position indicator after
       reading or discarding pushed-back bytes will be	the  same  as  it  was
       before the bytes were pushed back.

       A successful call to ungetc() or ungetwc() clears the end-of-file indi‐
       cator and decrements the file-position indicator for the stream. If the
       value of the file-position indicator is zero before the call, the value
       is indeterminate after the call. These functions do not have any effect
       on the external storage corresponding to the stream.

       One  character of push back is guaranteed (this corresponds to one byte
       for ungetc()) and one or more bytes for ungetwc()); however, if one  of
       these  functions is called too many times on the same stream without an
       intervening read or file-positioning operation on that stream, industry
       standards  specify  that	 the  functions may fail. (Applications do not
       encounter this failure on Tru64	UNIX  systems.	However,  results  are
       unpredictable  if applications intermix calls to ungetc() and ungetwc()
       on the same stream.)

RETURN VALUES
       On successful insertion of the converted	 byte  into  the  stream,  the
       ungetc()	 function  returns  the	 value	of c.  Otherwise, the function
       returns EOF.

       On successful insertion	of  the	 converted  wide  character  into  the
       stream,	the  ungetwc() function returns the value of wchar. Otherwise,
       the function returns WEOF.

ERRORS
       If the following condition occurs, the ungetwc() function sets errno to
       the  corresponding  value:  An  invalid byte sequence is detected, or a
       wide-character code does not  correspond	 to  a	valid  single-byte  or
       multibyte character in the current locale.

SEE ALSO
       Functions: fseek(3), getc(3), getwc(3), setbuf(3)

       Standards: standards(5)

								     ungetc(3)
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