xref: /illumos-gate/usr/src/lib/libc/port/print/sprintf.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 <values.h>
36 #include <errno.h>
37 #include <thread.h>
38 #include <synch.h>
39 #include <sys/types.h>
40 #include "print.h"
41 #include "libc.h"
42 
43 /*VARARGS2*/
44 int
sprintf(char * string,const char * format,...)45 sprintf(char *string, const char *format, ...)
46 {
47 	ssize_t count;
48 	FILE siop;
49 	va_list ap;
50 
51 	siop._cnt = MAXINT;
52 	siop._base = siop._ptr = (unsigned char *)string;
53 	siop._flag = _IOREAD; /* distinguish dummy file descriptor */
54 	va_start(ap, format);
55 
56 	count = _ndoprnt(format, ap, &siop, 0);
57 	va_end(ap);
58 	*siop._ptr = '\0'; /* plant terminating null character */
59 	if (count == EOF) {
60 		return (EOF);
61 	}
62 
63 	/* check for overflow */
64 	if ((size_t)count > MAXINT) {
65 		errno = EOVERFLOW;
66 		return (EOF);
67 	} else {
68 		return ((int)count);
69 	}
70 }
71 
72 #ifndef _LP64
73 
74 /*
75  * 32-bit shadow function of sprintf().
76  * When using the c89 compiler to build 32-bit applications, the size
77  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
78  * The shadow function uses 32-bit size of intmax_t for %j conversion.
79  * The #pragma redefine_extname in <stdio.h> selects the proper routine
80  * at compile time for the user application.
81  * NOTE: this function is only available in the 32-bit library.
82  */
83 
84 int
_sprintf_c89(char * string,const char * format,...)85 _sprintf_c89(char *string, const char *format, ...)
86 {
87 	ssize_t count;
88 	va_list ap;
89 
90 	va_start(ap, format);
91 	count = _vsprintf_c89(string, format, ap);
92 	va_end(ap);
93 	return ((int)count);
94 }
95 
96 #endif	/* _LP64 */
97