xref: /illumos-gate/usr/src/lib/libc/port/print/fprintf.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 /*
33  * This symbol should not be defined, but there are some
34  * miserable old compiler libraries that depend on it.
35  */
36 #pragma weak _fprintf = fprintf
37 
38 #include "lint.h"
39 #include <mtlib.h>
40 #include <thread.h>
41 #include <synch.h>
42 #include <stdarg.h>
43 #include <values.h>
44 #include <errno.h>
45 #include "print.h"
46 #include <sys/types.h>
47 #include "libc.h"
48 #include "mse.h"
49 
50 /*VARARGS2*/
51 int
fprintf(FILE * iop,const char * format,...)52 fprintf(FILE *iop, const char *format, ...)
53 {
54 	ssize_t count;
55 	rmutex_t *lk;
56 	va_list ap;
57 
58 	va_start(ap, format);
59 
60 	/* Use F*LOCKFILE() macros because fprintf() is not async-safe. */
61 	FLOCKFILE(lk, iop);
62 
63 	_SET_ORIENTATION_BYTE(iop);
64 
65 	if (!(iop->_flag & _IOWRT)) {
66 		/* if no write flag */
67 		if (iop->_flag & _IORW) {
68 			/* if ok, cause read-write */
69 			iop->_flag |= _IOWRT;
70 		} else {
71 			/* else error */
72 			FUNLOCKFILE(lk);
73 			errno = EBADF;
74 			return (EOF);
75 		}
76 	}
77 	count = _ndoprnt(format, ap, iop, 0);
78 
79 	/* return EOF on error or EOF */
80 	if (FERROR(iop) || count == EOF) {
81 		FUNLOCKFILE(lk);
82 		return (EOF);
83 	}
84 
85 	FUNLOCKFILE(lk);
86 
87 	/* error on overflow */
88 	if ((size_t)count > MAXINT) {
89 		errno = EOVERFLOW;
90 		return (EOF);
91 	}
92 	return ((int)count);
93 }
94 
95 #ifndef _LP64
96 
97 /*
98  * 32-bit shadow function of fprintf().
99  * When using the c89 compiler to build 32-bit applications, the size
100  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
101  * The shadow function uses 32-bit size of intmax_t for %j conversion.
102  * The #pragma redefine_extname in <stdio.h> selects the proper routine
103  * at compile time for the user application.
104  * NOTE: this function only exists in the 32-bit library.
105  */
106 
107 int
_fprintf_c89(FILE * iop,const char * format,...)108 _fprintf_c89(FILE *iop, const char *format, ...)
109 {
110 	ssize_t count;
111 	va_list ap;
112 
113 	va_start(ap, format);
114 	count = _vfprintf_c89(iop, format, ap);
115 	va_end(ap);
116 	return ((int)count);
117 }
118 
119 #endif  /* _LP64 */
120