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 2025 Hans Rosenfeld
24 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27
28 /* Copyright (c) 1988 AT&T */
29 /* All Rights Reserved */
30
31 #include "lint.h"
32 #include <thread.h>
33 #include <mtlib.h>
34 #include <synch.h>
35 #include <stdarg.h>
36 #include <values.h>
37 #include <errno.h>
38 #include <sys/types.h>
39 #include "print.h"
40 #include "libc.h"
41 #include "mse.h"
42
43 #ifdef _C89_INTMAX32
44 /*
45 * 32-bit shadow functions of vfprintf(), fprintf(), vprintf(), and printf()
46 * are built here.
47 * When using the c89 compiler to build 32-bit applications, the size
48 * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
49 * The shadow function uses 32-bit size of intmax_t for %j conversion.
50 * The #pragma redefine_extname in <stdio.h> selects the proper routine
51 * at compile time for the user application.
52 * NOTE: these functions are only available in the 32-bit library.
53 */
54 #pragma redefine_extname vfprintf _vfprintf_c89
55 #pragma redefine_extname fprintf _fprintf_c89
56 #pragma redefine_extname vprintf _vprintf_c89
57 #pragma redefine_extname printf _printf_c89
58 #else
59 /*
60 * This symbol should not be defined, but there are some
61 * miserable old compiler libraries that depend on it.
62 */
63 #pragma weak _fprintf = fprintf
64 #endif
65
66 int
vfprintf(FILE * iop,const char * format,va_list ap)67 vfprintf(FILE *iop, const char *format, va_list ap)
68 {
69 ssize_t count;
70 rmutex_t *lk;
71
72 /* Use F*LOCKFILE() macros because vfprintf() is not async-safe. */
73 FLOCKFILE(lk, iop);
74
75 _SET_ORIENTATION_BYTE(iop);
76
77 if (!(iop->_flag & _IOWRT)) {
78 /* if no write flag */
79 if (iop->_flag & _IORW) {
80 /* if ok, cause read-write */
81 iop->_flag |= _IOWRT;
82 } else {
83 /* else error */
84 FUNLOCKFILE(lk);
85 errno = EBADF;
86 return (EOF);
87 }
88 }
89 #ifdef _C89_INTMAX32
90 count = _ndoprnt(format, ap, iop, _F_INTMAX32);
91 #else
92 count = _ndoprnt(format, ap, iop, 0);
93 #endif
94
95 /* check for error or EOF */
96 if (FERROR(iop) || count == EOF) {
97 FUNLOCKFILE(lk);
98 return (EOF);
99 }
100
101 FUNLOCKFILE(lk);
102
103 /* check for overflow */
104 if ((size_t)count > MAXINT) {
105 errno = EOVERFLOW;
106 return (EOF);
107 }
108
109 return ((int)count);
110 }
111
112 int
fprintf(FILE * iop,const char * format,...)113 fprintf(FILE *iop, const char *format, ...)
114 {
115 int count;
116 va_list ap;
117
118 va_start(ap, format);
119 count = vfprintf(iop, format, ap);
120 va_end(ap);
121
122 return (count);
123 }
124
125 int
vprintf(const char * format,va_list ap)126 vprintf(const char *format, va_list ap)
127 {
128 int count;
129
130 count = vfprintf(stdout, format, ap);
131
132 return (count);
133 }
134
135 int
printf(const char * format,...)136 printf(const char *format, ...)
137 {
138 int count;
139 va_list ap;
140
141 va_start(ap, format);
142 count = vfprintf(stdout, format, ap);
143 va_end(ap);
144
145 return (count);
146 }
147