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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 /*
     33  *	This routine is a special case, in that it is aware of
     34  *	both small and large file interfaces. It must be built
     35  *	in the small compilation environment.
     36  */
     37 
     38 #include "lint.h"
     39 #include "file64.h"
     40 #include <mtlib.h>
     41 #include <sys/types.h>
     42 #include <stdio.h>
     43 #include <fcntl.h>
     44 #include <unistd.h>
     45 #include <limits.h>
     46 #include <thread.h>
     47 #include <synch.h>
     48 #include "stdiom.h"
     49 #include <errno.h>
     50 
     51 /*
     52  * open UNIX file name, associate with iop
     53  */
     54 
     55 FILE *
     56 _endopen(const char *name, const char *type, FILE *iop, int largefile)
     57 {
     58 	int oflag, fd, fflag;
     59 	char plus;
     60 
     61 	if (iop == NULL)
     62 		return (NULL);
     63 	switch (type[0]) {
     64 	default:
     65 		errno = EINVAL;
     66 		return (NULL);
     67 	case 'r':
     68 		oflag = O_RDONLY;
     69 		fflag = _IOREAD;
     70 		break;
     71 	case 'w':
     72 		oflag = O_WRONLY | O_TRUNC | O_CREAT;
     73 		fflag = _IOWRT;
     74 		break;
     75 	case 'a':
     76 		oflag = O_WRONLY | O_APPEND | O_CREAT;
     77 		fflag = _IOWRT;
     78 		break;
     79 	}
     80 	/* UNIX ignores 'b' and treats text and binary the same */
     81 	if ((plus = type[1]) == 'b')
     82 		plus = type[2];
     83 	if (plus == '+') {
     84 		oflag = (oflag & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
     85 		fflag = _IORW;
     86 	}
     87 
     88 	/* select small or large file open based on flag */
     89 	if (largefile) {
     90 		fd = open64(name, oflag, 0666);
     91 	} else {
     92 		fd = open(name, oflag, 0666);
     93 	}
     94 	if (fd < 0)
     95 		return (NULL);
     96 
     97 	/* As long as we make sure _flag stays != 0, we don't need to lock */
     98 #ifdef	_LP64
     99 	iop->_file = fd;
    100 	iop->_flag = (iop->_flag & ~0377) | fflag;
    101 #else
    102 	if (fd <= _FILE_FD_MAX) {
    103 		SET_FILE(iop, fd);
    104 	} else if (_file_set(iop, fd, type) != 0) {
    105 		/* errno set in _file_set() */
    106 		(void) close(fd);
    107 		return (NULL);
    108 	}
    109 	iop->_flag = fflag;
    110 #endif	/*	_LP64	*/
    111 
    112 	if (oflag == (O_WRONLY | O_APPEND | O_CREAT)) {	/* type == "a" */
    113 		if (lseek64(fd, (off64_t)0, SEEK_END) < (off64_t)0) {
    114 			(void) close(fd);
    115 			return (NULL);
    116 		}
    117 	}
    118 
    119 	return (iop);
    120 }
    121