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HP-UX Reference > Uungetwc(3C)HP-UX 11i Version 3: February 2007 |
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NAMEungetwc() — push a wide character back into an input stream SYNOPSIS#include <wchar.h> wint_t ungetwc(wint_t wc, FILE *stream); Remarks:This function is compliant with the XPG4 Worldwide Portability Interface wide-character I/O functions. It parallels the 8-bit character I/O function defined in ungetc(3S). DESCRIPTIONungetwc() pushes the character corresponding to the wide-character code wc into the buffer associated with an input stream. That wide-character code, wc, is returned by the next call to getwc() (see getwc(3C)) on that stream. A successful intervening call to a file positioning function with stream (fseek(), fsetpos(), or rewind()) erases all memory of the pushed-back characters. ungetwc() affects only the buffer associated with the input stream. It does not affect the contents of the file corresponding to stream. One character of pushback is guaranteed. If wc equals WEOF, ungetwc() does nothing to the buffer and returns WEOF. The definition for this function, the type wint_t and the value WEOF are provided in the <wchar.h> header. APPLICATION USAGEAfter ungetwc() is applied to a stream, the stream becomes wide-oriented (see orientation(5)). RETURN VALUEIf successful, ungetwc() and ungetwc_unlocked() return wc and clear the end-of-file indicator for the stream. ungetwc() and ungetwc_unlocked() return WEOF if they cannot insert the wide character. WARNINGSungetwc_unlocked() is an obsolescent interface supported only for compatibility with existing DCE applications. New multithreaded applications should use ungetwc(). SEE ALSOflockfile(3S), fseek(3S), fgetpos(3S), getwc(3C), setbuf(3S), orientation(5), thread_safety(5). |
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