diff options
Diffstat (limited to 'mit-pthreads/stdio/fgetpos.c')
| -rw-r--r-- | mit-pthreads/stdio/fgetpos.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/mit-pthreads/stdio/fgetpos.c b/mit-pthreads/stdio/fgetpos.c new file mode 100644 index 00000000000..c81b48e3cc8 --- /dev/null +++ b/mit-pthreads/stdio/fgetpos.c @@ -0,0 +1,85 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * Copyright (c) 1993, 1994 Chris Provenzano. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +/*static char *sccsid = "from: @(#)fgetpos.c 5.1 (Berkeley) 1/20/91";*/ +static char *rcsid = "$Id$"; +#endif /* LIBC_SCCS and not lint */ + +#include <pthread.h> +#include <unistd.h> +#include <stdio.h> +#include "local.h" + +fgetpos(fp, pos) + FILE *fp; + fpos_t *pos; +{ + flockfile(fp); + + /* + * Find offset of underlying I/O object, then + * adjust for buffered bytes. + */ + if (fp->_flags & __SOFF) { + *pos = fp->_offset; + } else { + *pos = __sseek(fp, (off_t)0, SEEK_CUR); + } + + if (*pos != (fpos_t)-1) { + if (fp->_flags & __SRD) { + /* + * Reading. Any unread characters (including + * those from ungetc) cause the position to be + * smaller than that in the underlying object. + */ + *pos -= fp->_r; + if (HASUB(fp)) + *pos -= fp->_ur; + } else if (fp->_flags & __SWR && fp->_p != NULL) { + /* + * Writing. Any buffered characters cause the + * position to be greater than that in the + * underlying object. + */ + *pos += fp->_p - fp->_bf._base; + } + } + funlockfile(fp); + return ((*pos) == (fpos_t)-1); +} |