xref: /illumos-gate/usr/src/lib/libc/port/print/fprintf.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
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 /*
31  * This symbol should not be defined, but there are some
32  * miserable old compiler libraries that depend on it.
33  */
34 #pragma weak _fprintf = fprintf
35 
36 #include "lint.h"
37 #include <mtlib.h>
38 #include <thread.h>
39 #include <synch.h>
40 #include <stdarg.h>
41 #include <values.h>
42 #include <errno.h>
43 #include "print.h"
44 #include <sys/types.h>
45 #include "libc.h"
46 #include "mse.h"
47 
48 /*VARARGS2*/
49 int
fprintf(FILE * iop,const char * format,...)50 fprintf(FILE *iop, const char *format, ...)
51 {
52 	ssize_t count;
53 	rmutex_t *lk;
54 	va_list ap;
55 
56 	va_start(ap, format);
57 
58 	/* Use F*LOCKFILE() macros because fprintf() is not async-safe. */
59 	FLOCKFILE(lk, iop);
60 
61 	_SET_ORIENTATION_BYTE(iop);
62 
63 	if (!(iop->_flag & _IOWRT)) {
64 		/* if no write flag */
65 		if (iop->_flag & _IORW) {
66 			/* if ok, cause read-write */
67 			iop->_flag |= _IOWRT;
68 		} else {
69 			/* else error */
70 			FUNLOCKFILE(lk);
71 			errno = EBADF;
72 			return (EOF);
73 		}
74 	}
75 	count = _ndoprnt(format, ap, iop, 0);
76 
77 	/* return EOF on error or EOF */
78 	if (FERROR(iop) || count == EOF) {
79 		FUNLOCKFILE(lk);
80 		return (EOF);
81 	}
82 
83 	FUNLOCKFILE(lk);
84 
85 	/* error on overflow */
86 	if ((size_t)count > MAXINT) {
87 		errno = EOVERFLOW;
88 		return (EOF);
89 	}
90 	return ((int)count);
91 }
92 
93 #ifndef _LP64
94 
95 /*
96  * 32-bit shadow function of fprintf().
97  * When using the c89 compiler to build 32-bit applications, the size
98  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
99  * The shadow function uses 32-bit size of intmax_t for %j conversion.
100  * The #pragma redefine_extname in <stdio.h> selects the proper routine
101  * at compile time for the user application.
102  * NOTE: this function only exists in the 32-bit library.
103  */
104 
105 int
_fprintf_c89(FILE * iop,const char * format,...)106 _fprintf_c89(FILE *iop, const char *format, ...)
107 {
108 	ssize_t count;
109 	va_list ap;
110 
111 	va_start(ap, format);
112 	count = _vfprintf_c89(iop, format, ap);
113 	va_end(ap);
114 	return ((int)count);
115 }
116 
117 #endif  /* _LP64 */
118