xref: /illumos-gate/usr/src/lib/libc/port/print/printf.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 <mtlib.h>
34 #include <stdarg.h>
35 #include <errno.h>
36 #include <thread.h>
37 #include <synch.h>
38 #include <values.h>
39 #include "print.h"
40 #include <sys/types.h>
41 #include "libc.h"
42 #include "mse.h"
43 
44 /*VARARGS1*/
45 int
printf(const char * format,...)46 printf(const char *format, ...)
47 {
48 	ssize_t count;
49 	rmutex_t *lk;
50 	va_list ap;
51 
52 	va_start(ap, format);
53 
54 	/* Use F*LOCKFILE() macros because printf() is not async-safe. */
55 	FLOCKFILE(lk, stdout);
56 
57 	_SET_ORIENTATION_BYTE(stdout);
58 
59 	if (!(stdout->_flag & _IOWRT)) {
60 		/* if no write flag */
61 		if (stdout->_flag & _IORW) {
62 			/* if ok, cause read-write */
63 			stdout->_flag |= _IOWRT;
64 		} else {
65 			/* else error */
66 			FUNLOCKFILE(lk);
67 			errno = EBADF;
68 			return (EOF);
69 		}
70 	}
71 	count = _ndoprnt(format, ap, stdout, 0);
72 	va_end(ap);
73 
74 	/* check for errors or EOF */
75 	if (FERROR(stdout) || count ==  EOF) {
76 		FUNLOCKFILE(lk);
77 		return (EOF);
78 	}
79 
80 	FUNLOCKFILE(lk);
81 
82 	/* check for overflow */
83 	if ((size_t)count > MAXINT) {
84 		errno = EOVERFLOW;
85 		return (EOF);
86 	} else {
87 		return ((int)count);
88 	}
89 }
90 
91 #ifndef _LP64
92 
93 /*
94  * 32-bit shadow function of printf().
95  * When using the c89 compiler to build 32-bit applications, the size
96  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
97  * The shadow function uses 32-bit size of intmax_t for %j conversion.
98  * The #pragma redefine_extname in <stdio.h> selects the proper routine
99  * at compile time for the user application.
100  * NOTE: this function only exists in the 32-bit library.
101  */
102 
103 int
_printf_c89(const char * format,...)104 _printf_c89(const char *format, ...)
105 {
106 	ssize_t count;
107 	va_list ap;
108 
109 	va_start(ap, format);
110 	count = _vprintf_c89(format, ap);
111 	va_end(ap);
112 	return ((int)count);
113 }
114 
115 #endif
116