xref: /freebsd/lib/libthr/thread/thr_printf.c (revision 7ef62cebc2f965b0f640263e179276928885e33d)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 
32 #include <stdarg.h>
33 #include <string.h>
34 #include <unistd.h>
35 #include <pthread.h>
36 
37 #include "libc_private.h"
38 #include "thr_private.h"
39 
40 static void	pchar(int fd, char c);
41 static void	pstr(int fd, const char *s);
42 
43 /*
44  * Write formatted output to stdout, in a thread-safe manner.
45  *
46  * Recognises the following conversions:
47  *	%c	-> char
48  *	%d	-> signed int (base 10)
49  *	%s	-> string
50  *	%u	-> unsigned int (base 10)
51  *	%x	-> unsigned int (base 16)
52  *	%p	-> unsigned int (base 16)
53  */
54 void
55 _thread_printf(int fd, const char *fmt, ...)
56 {
57 	va_list	ap;
58 
59 	va_start(ap, fmt);
60 	_thread_vprintf(fd, fmt, ap);
61 	va_end(ap);
62 }
63 
64 void
65 _thread_vprintf(int fd, const char *fmt, va_list ap)
66 {
67 	static const char digits[16] = "0123456789abcdef";
68 	char buf[20];
69 	char *s;
70 	unsigned long r, u;
71 	int c;
72 	long d;
73 	int islong, isalt;
74 
75 	while ((c = *fmt++)) {
76 		isalt = 0;
77 		islong = 0;
78 		if (c == '%') {
79 next:			c = *fmt++;
80 			if (c == '\0')
81 				return;
82 			switch (c) {
83 			case '#':
84 				isalt = 1;
85 				goto next;
86 			case 'c':
87 				pchar(fd, va_arg(ap, int));
88 				continue;
89 			case 's':
90 				pstr(fd, va_arg(ap, char *));
91 				continue;
92 			case 'l':
93 				islong = 1;
94 				goto next;
95 			case 'p':
96 				pstr(fd, "0x");
97 				islong = 1;
98 				/* FALLTHROUGH */
99 			case 'd':
100 			case 'u':
101 			case 'x':
102 				if (c == 'x' && isalt)
103 					pstr(fd, "0x");
104 				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
105 				if (c == 'd') {
106 					if (islong)
107 						d = va_arg(ap, unsigned long);
108 					else
109 						d = va_arg(ap, unsigned);
110 					if (d < 0) {
111 						pchar(fd, '-');
112 						u = (unsigned long)(d * -1);
113 					} else
114 						u = (unsigned long)d;
115 				} else {
116 					if (islong)
117 						u = va_arg(ap, unsigned long);
118 					else
119 						u = va_arg(ap, unsigned);
120 				}
121 				s = buf;
122 				do {
123 					*s++ = digits[u % r];
124 				} while (u /= r);
125 				while (--s >= buf)
126 					pchar(fd, *s);
127 				continue;
128 			}
129 		}
130 		pchar(fd, c);
131 	}
132 }
133 
134 /*
135  * Write a single character to stdout, in a thread-safe manner.
136  */
137 static void
138 pchar(int fd, char c)
139 {
140 
141 	__sys_write(fd, &c, 1);
142 }
143 
144 /*
145  * Write a string to stdout, in a thread-safe manner.
146  */
147 static void
148 pstr(int fd, const char *s)
149 {
150 
151 	__sys_write(fd, s, strlen(s));
152 }
153 
154