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ungetc(3s) [hpux man page]

ungetc(3S)																ungetc(3S)

ungetc() - push character back into input stream SYNOPSIS
Obsolescent Interface DESCRIPTION
inserts the character c (converted to an unsigned char) into the buffer associated with an input stream. That character, c, is returned by the next call to (see getc(3S)) on that stream. A successful intervening call to a file positioning function with stream or erases all memory of the inserted characters. 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 c equals EOF, does nothing to the buffer and returns EOF. Obsolescent Interface pushes character back into input stream. APPLICATION USAGE
After is applied to a stream, the stream becomes byte-oriented (see orientation(5)). RETURN VALUE
If successful, and return c and clear the end-of-file indicator for the stream. and return EOF if they cannot insert the character. WARNINGS
is an obsolescent interface supported only for compatibility with existing DCE applications. New multithreaded applications should use SEE ALSO
flockfile(3S), fseek(3S), fgetpos(3S), getc(3S), setbuf(3S), orientation(5), thread_safety(5). STANDARDS CONFORMANCE

Check Out this Related Man Page

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

ungetc -- un-get character from input stream LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdio.h> int ungetc(int c, FILE *stream); DESCRIPTION
The ungetc() 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 (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 characters. Only one 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. 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 VALUES
The ungetc() function returns the character pushed-back after the conversion, 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 ungetc() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD
June 4, 1993 BSD
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