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       ---
       stdio.c (3236B)
       ---
            1 /*-
            2  * Copyright (c) 1990, 1993
            3  *        The Regents of the University of California.  All rights reserved.
            4  *
            5  * This code is derived from software contributed to Berkeley by
            6  * Chris Torek.
            7  *
            8  * Redistribution and use in source and binary forms, with or without
            9  * modification, are permitted provided that the following conditions
           10  * are met:
           11  * 1. Redistributions of source code must retain the above copyright
           12  *    notice, this list of conditions and the following disclaimer.
           13  * 2. Redistributions in binary form must reproduce the above copyright
           14  *    notice, this list of conditions and the following disclaimer in the
           15  *    documentation and/or other materials provided with the distribution.
           16  * 3. All advertising materials mentioning features or use of this software
           17  *    must display the following acknowledgement:
           18  *        This product includes software developed by the University of
           19  *        California, Berkeley and its contributors.
           20  * 4. Neither the name of the University nor the names of its contributors
           21  *    may be used to endorse or promote products derived from this software
           22  *    without specific prior written permission.
           23  *
           24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
           25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
           26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
           27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
           28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
           29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
           30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
           31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
           32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
           33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
           34  * SUCH DAMAGE.
           35  */
           36 
           37 #if defined(LIBC_SCCS) && !defined(lint)
           38 static char rcsid[] = "$OpenBSD: stdio.c,v 1.3 1997/11/09 23:40:41 flipk Exp $";
           39 #endif /* LIBC_SCCS and not lint */
           40 
           41 #include <fcntl.h>
           42 #include <unistd.h>
           43 #include <stdio.h>
           44 #include "local.h"
           45 
           46 /*
           47  * Small standard I/O/seek/close functions.
           48  * These maintain the `known seek offset' for seek optimisation.
           49  */
           50 int
           51 __sread(cookie, buf, n)
           52         void *cookie;
           53         char *buf;
           54         int n;
           55 {
           56         register FILE *fp = cookie;
           57         register int ret;
           58         
           59         ret = read(fp->_file, buf, n);
           60         /* if the read succeeded, update the current offset */
           61         if (ret >= 0)
           62                 fp->_offset += ret;
           63         else
           64                 fp->_flags &= ~__SOFF;        /* paranoia */
           65         return (ret);
           66 }
           67 
           68 int
           69 __swrite(cookie, buf, n)
           70         void *cookie;
           71         char const *buf;
           72         int n;
           73 {
           74         register FILE *fp = cookie;
           75 
           76         if (fp->_flags & __SAPP)
           77                 (void) lseek(fp->_file, (off_t)0, SEEK_END);
           78         fp->_flags &= ~__SOFF;        /* in case FAPPEND mode is set */
           79         return (write(fp->_file, buf, n));
           80 }
           81 
           82 fpos_t
           83 __sseek(cookie, offset, whence)
           84         void *cookie;
           85         fpos_t offset;
           86         int whence;
           87 {
           88         register FILE *fp = cookie;
           89         register off_t ret;
           90         
           91         ret = lseek(fp->_file, (off_t)offset, whence);
           92         if (ret == (off_t)-1)
           93                 fp->_flags &= ~__SOFF;
           94         else {
           95                 fp->_flags |= __SOFF;
           96                 fp->_offset = ret;
           97         }
           98         return (ret);
           99 }
          100 
          101 int
          102 __sclose(cookie)
          103         void *cookie;
          104 {
          105 
          106         return (close(((FILE *)cookie)->_file));
          107 }