/* * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * and/or other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* FUNCTION <>---record position in a stream or file INDEX fgetpos INDEX _fgetpos_r SYNOPSIS #include int fgetpos(FILE *restrict <[fp]>, fpos_t *restrict <[pos]>); int fgetpos( FILE *restrict <[fp]>, fpos_t *restrict <[pos]>); DESCRIPTION Objects of type <> can have a ``position'' that records how much of the file your program has already read. Many of the <> functions depend on this position, and many change it as a side effect. You can use <> to report on the current position for a file identified by <[fp]>; <> will write a value representing that position at <<*<[pos]>>>. Later, you can use this value with <> to return the file to this position. In the current implementation, <> simply uses a character count to represent the file position; this is the same number that would be returned by <>. RETURNS <> returns <<0>> when successful. If <> fails, the result is <<1>>. Failure occurs on streams that do not support positioning; the global <> indicates this condition with the value <>. PORTABILITY <> is required by the ANSI C standard, but the meaning of the value it records is not specified beyond requiring that it be acceptable as an argument to <>. In particular, other conforming C implementations may return a different result from <> than what <> writes at <<*<[pos]>>>. No supporting OS subroutines are required. */ #define _DEFAULT_SOURCE #include <_ansi.h> #include int fgetpos ( FILE *__restrict fp, _fpos_t *__restrict pos) { *pos = ftell ( fp); if (*pos != -1) { return 0; } return 1; }