xref: /titanic_52/usr/src/lib/libc/port/print/vsprintf.c (revision 7257d1b4d25bfac0c802847390e98a464fd787ac)
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 <values.h>
36 #include <errno.h>
37 #include <synch.h>
38 #include <thread.h>
39 #include <sys/types.h>
40 #include "print.h"
41 #include "libc.h"
42 
43 /*
44  * 32-bit shadow function of vsprintf() is included here.
45  * When using the c89 compiler to build 32-bit applications, the size
46  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
47  * The shadow function uses 32-bit size of intmax_t for %j conversion.
48  * The #pragma redefine_extname in <stdio.h> selects the proper routine
49  * at compile time for the user application.
50  * NOTE: this function is only available in the 32-bit library.
51  */
52 
53 /*VARARGS2*/
54 int
55 #ifdef _C89_INTMAX32
56 _vsprintf_c89(char *string, const char *format, va_list ap)
57 #else
58 vsprintf(char *string, const char *format, va_list ap)
59 #endif
60 {
61 	ssize_t count;
62 	FILE siop;
63 
64 	siop._cnt = MAXINT;
65 	siop._base = siop._ptr = (unsigned char *)string;
66 	siop._flag = _IOREAD; /* distinguish dummy file descriptor */
67 #ifdef _C89_INTMAX32
68 	count = _ndoprnt(format, ap, &siop, _F_INTMAX32);
69 #else
70 	count = _ndoprnt(format, ap, &siop, 0);
71 #endif
72 	*siop._ptr = '\0'; /* plant terminating null character */
73 
74 	if (count == EOF) {
75 		return (EOF);
76 	}
77 	/* check for overflow */
78 	if ((size_t)count > MAXINT) {
79 		errno = EOVERFLOW;
80 		return (EOF);
81 	} else {
82 		return ((int)count);
83 	}
84 }
85