xref: /illumos-gate/usr/src/lib/libc/port/print/vfprintf.c (revision 7257d1b4)
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 #include "lint.h"
33 #include <thread.h>
34 #include <mtlib.h>
35 #include <synch.h>
36 #include <stdarg.h>
37 #include <values.h>
38 #include <errno.h>
39 #include <sys/types.h>
40 #include "print.h"
41 #include "libc.h"
42 #include "mse.h"
43 
44 /*
45  * 32-bit shadow function of vfprintf() is included here.
46  * When using the c89 compiler to build 32-bit applications, the size
47  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
48  * The shadow function uses 32-bit size of intmax_t for %j conversion.
49  * The #pragma redefine_extname in <stdio.h> selects the proper routine
50  * at compile time for the user application.
51  * NOTE: this function is only available in the 32-bit library.
52  */
53 
54 /*VARARGS2*/
55 int
56 #ifdef _C89_INTMAX32	/* _C89_INTMAX32 version in 32-bit libc only */
_vfprintf_c89(FILE * iop,const char * format,va_list ap)57 _vfprintf_c89(FILE *iop, const char *format, va_list ap)
58 #else
59 vfprintf(FILE *iop, const char *format, va_list ap)
60 #endif
61 {
62 	ssize_t count;
63 	rmutex_t *lk;
64 
65 	/* Use F*LOCKFILE() macros because vfprintf() is not async-safe. */
66 	FLOCKFILE(lk, iop);
67 
68 	_SET_ORIENTATION_BYTE(iop);
69 
70 	if (!(iop->_flag & _IOWRT)) {
71 		/* if no write flag */
72 		if (iop->_flag & _IORW) {
73 			/* if ok, cause read-write */
74 			iop->_flag |= _IOWRT;
75 		} else {
76 			/* else error */
77 			FUNLOCKFILE(lk);
78 			errno = EBADF;
79 			return (EOF);
80 		}
81 	}
82 #ifdef _C89_INTMAX32
83 	count = _ndoprnt(format, ap, iop, _F_INTMAX32);
84 #else
85 	count = _ndoprnt(format, ap, iop, 0);
86 #endif
87 
88 	/* check for error or EOF */
89 	if (FERROR(iop) || count == EOF) {
90 		FUNLOCKFILE(lk);
91 		return (EOF);
92 	}
93 
94 	FUNLOCKFILE(lk);
95 
96 	/* check for overflow */
97 	if ((size_t)count > MAXINT) {
98 		errno = EOVERFLOW;
99 		return (EOF);
100 	} else {
101 		return ((int)count);
102 	}
103 }
104