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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc1/] [newlib/] [libc/] [stdio/] [fgetpos.c] - Rev 345
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/* * 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, * advertising materials, and 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 <<fgetpos>>---record position in a stream or file INDEX fgetpos INDEX _fgetpos_r ANSI_SYNOPSIS #include <stdio.h> int fgetpos(FILE *<[fp]>, fpos_t *<[pos]>); int _fgetpos_r(struct _reent *<[ptr]>, FILE *<[fp]>, fpos_t *<[pos]>); TRAD_SYNOPSIS #include <stdio.h> int fgetpos(<[fp]>, <[pos]>) FILE *<[fp]>; fpos_t *<[pos]>; int _fgetpos_r(<[ptr]>, <[fp]>, <[pos]>) struct _reent *<[ptr]>; FILE *<[fp]>; fpos_t *<[pos]>; DESCRIPTION Objects of type <<FILE>> can have a ``position'' that records how much of the file your program has already read. Many of the <<stdio>> functions depend on this position, and many change it as a side effect. You can use <<fgetpos>> to report on the current position for a file identified by <[fp]>; <<fgetpos>> will write a value representing that position at <<*<[pos]>>>. Later, you can use this value with <<fsetpos>> to return the file to this position. In the current implementation, <<fgetpos>> simply uses a character count to represent the file position; this is the same number that would be returned by <<ftell>>. RETURNS <<fgetpos>> returns <<0>> when successful. If <<fgetpos>> fails, the result is <<1>>. Failure occurs on streams that do not support positioning; the global <<errno>> indicates this condition with the value <<ESPIPE>>. PORTABILITY <<fgetpos>> 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 <<fsetpos>>. In particular, other conforming C implementations may return a different result from <<ftell>> than what <<fgetpos>> writes at <<*<[pos]>>>. No supporting OS subroutines are required. */ #include <_ansi.h> #include <reent.h> #include <stdio.h> int _DEFUN(_fgetpos_r, (ptr, fp, pos), struct _reent * ptr _AND FILE * fp _AND _fpos_t * pos) { *pos = _ftell_r (ptr, fp); if (*pos != -1) { return 0; } return 1; } #ifndef _REENT_ONLY int _DEFUN(fgetpos, (fp, pos), FILE * fp _AND _fpos_t * pos) { return _fgetpos_r (_REENT, fp, pos); } #endif /* !_REENT_ONLY */