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stdio.c revision 1.4.2.1 
      1 /*	$NetBSD: stdio.c,v 1.4.2.1 1995/03/02 20:24:11 jtc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Chris Torek.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 #if 0
     41 static char sccsid[] = "@(#)stdio.c	8.1 (Berkeley) 6/4/93";
     42 #endif
     43 static char rcsid[] = "$NetBSD: stdio.c,v 1.4.2.1 1995/03/02 20:24:11 jtc Exp $";
     44 #endif /* LIBC_SCCS and not lint */
     45 
     46 #include "namespace.h"
     47 #include <fcntl.h>
     48 #include <unistd.h>
     49 #include <stdio.h>
     50 #include "local.h"
     51 
     52 /*
     53  * Small standard I/O/seek/close functions.
     54  * These maintain the `known seek offset' for seek optimisation.
     55  */
     56 __sread(cookie, buf, n)
     57 	void *cookie;
     58 	char *buf;
     59 	int n;
     60 {
     61 	register FILE *fp = cookie;
     62 	register int ret;
     63 
     64 	ret = read(fp->_file, buf, n);
     65 	/* if the read succeeded, update the current offset */
     66 	if (ret >= 0)
     67 		fp->_offset += ret;
     68 	else
     69 		fp->_flags &= ~__SOFF;	/* paranoia */
     70 	return (ret);
     71 }
     72 
     73 __swrite(cookie, buf, n)
     74 	void *cookie;
     75 	char const *buf;
     76 	int n;
     77 {
     78 	register FILE *fp = cookie;
     79 
     80 	if (fp->_flags & __SAPP)
     81 		(void) lseek(fp->_file, (off_t)0, SEEK_END);
     82 	fp->_flags &= ~__SOFF;	/* in case FAPPEND mode is set */
     83 	return (write(fp->_file, buf, n));
     84 }
     85 
     86 fpos_t
     87 __sseek(cookie, offset, whence)
     88 	void *cookie;
     89 	fpos_t offset;
     90 	int whence;
     91 {
     92 	register FILE *fp = cookie;
     93 	register off_t ret;
     94 
     95 	ret = lseek(fp->_file, (off_t)offset, whence);
     96 	if (ret == -1L)
     97 		fp->_flags &= ~__SOFF;
     98 	else {
     99 		fp->_flags |= __SOFF;
    100 		fp->_offset = ret;
    101 	}
    102 	return (ret);
    103 }
    104 
    105 __sclose(cookie)
    106 	void *cookie;
    107 {
    108 
    109 	return (close(((FILE *)cookie)->_file));
    110 }
    111