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ungetwc_l(3) [osx man page]

UNGETWC(3)						   BSD Library Functions Manual 						UNGETWC(3)

ungetwc, ungetwc_l -- un-get wide character from input stream LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdio.h> #include <wchar.h> wint_t ungetwc(wint_t wc, FILE *stream); #include <stdio.h> #include <wchar.h> #include <xlocale.h> wint_t ungetwc_l(wint_t wc, FILE *stream, locale_t loc); DESCRIPTION
The ungetwc() function pushes the wide character wc (converted to an wchar_t) back onto the input stream pointed to by stream. The pushed- backed wide characters will be returned (in reverse order) by subsequent reads on the stream. A successful intervening call to one of the file positioning functions fseek(3), fsetpos(3), or rewind(3), using the same stream, will discard the pushed-back wide characters. Only one wide character of push-back is guaranteed, but as long as there is sufficient memory, an effectively infinite amount of push-back is allowed. If a character is successfully pushed-back, the end-of-file indicator for the stream is cleared. Although the ungetwc() function uses the current locale, the ungetwc_l() function may be passed a locale directly. See xlocale(3) for more information. RETURN VALUES
The ungetwc() function returns the wide character pushed-back after the conversion, or WEOF if the operation fails. If the value of the argument c character equals WEOF, the operation will fail and the stream will remain unchanged. SEE ALSO
fseek(3), getwc(3), xlocale(3) STANDARDS
The ungetwc() function conforms to ISO/IEC 9899:1999 (``ISO C99''). BSD
March 3, 2004 BSD

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ungetwc(3C)						   Standard C Library Functions 					       ungetwc(3C)

ungetwc - push wide-character code back into input stream SYNOPSIS
#include <stdio.h> #include <wchar.h> wint_t ungetwc(wint_t wc, FILE *stream); DESCRIPTION
The ungetwc() function pushes the character corresponding to the wide character code specified by wc back onto the input stream pointed to by stream. The pushed-back characters will be returned by subsequent reads on that stream in the reverse order of their pushing. A success- ful intervening call (with the stream pointed to by stream) to a file-positioning function ( fseek(3C), fsetpos(3C) or rewind(3C)) discards any pushed-back characters for the stream. The external storage corresponding to the stream is unchanged. One character of push-back is guaranteed. If ungetwc() 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 wc equals that of the macro WEOF, the operation fails and the input stream is unchanged. A successful call to ungetwc() clears 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 characters will be the same as it was before the characters were pushed back. The file-position indicator is decremented (by one or more) by each successful call to ungetwc(); if its value was 0 before a call, its value is indetermi- nate after the call. RETURN VALUES
Upon successful completion, ungetwc() returns the wide-character code corresponding to the pushed-back character. Otherwise it returns WEOF. ERRORS
The ungetwc() function may fail if: EILSEQ An invalid character sequence is detected, or a wide-character code does not correspond to a valid character. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ |ATTRIBUTE TYPE |ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
read(2), fseek(3C), fsetpos(3C), rewind(3C), setbuf(3C), attributes(5), standards(5) SunOS 5.11 14 Aug 2002 ungetwc(3C)
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