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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [stdio/] [fsetpos.c] - Rev 179
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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 <<fsetpos>>---restore position of a stream or file INDEX fsetpos INDEX _fsetpos_r ANSI_SYNOPSIS #include <stdio.h> int fsetpos(FILE *<[fp]>, const fpos_t *<[pos]>); int _fsetpos_r(struct _reent *<[ptr]>, FILE *<[fp]>, const fpos_t *<[pos]>); TRAD_SYNOPSIS #include <stdio.h> int fsetpos(<[fp]>, <[pos]>) FILE *<[fp]>; fpos_t *<[pos]>; int _fsetpos_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 <<fsetpos>> to return the file identified by <[fp]> to a previous position <<*<[pos]>>> (after first recording it with <<fgetpos>>). See <<fseek>> for a similar facility. RETURNS <<fgetpos>> returns <<0>> when successful. If <<fgetpos>> fails, the result is <<1>>. The reason for failure is indicated in <<errno>>: either <<ESPIPE>> (the stream identified by <[fp]> doesn't support repositioning) or <<EINVAL>> (invalid file position). PORTABILITY ANSI C requires <<fsetpos>>, but does not specify the nature of <<*<[pos]>>> beyond identifying it as written by <<fgetpos>>. Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ #include <_ansi.h> #include <reent.h> #include <stdio.h> int _DEFUN(_fsetpos_r, (ptr, iop, pos), struct _reent * ptr _AND FILE * iop _AND _CONST _fpos_t * pos) { int x = _fseek_r (ptr, iop, *pos, SEEK_SET); if (x != 0) return 1; return 0; } #ifndef _REENT_ONLY int _DEFUN(fsetpos, (iop, pos), FILE * iop _AND _CONST _fpos_t * pos) { return _fsetpos_r (_REENT, iop, pos); } #endif /* !_REENT_ONLY */
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