thr_printf.c revision 297706 
1/*-
2 * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libthr/thread/thr_printf.c 297706 2016-04-08 11:15:26Z kib $");
29
30#include <stdarg.h>
31#include <string.h>
32#include <unistd.h>
33#include <pthread.h>
34
35#include "libc_private.h"
36#include "thr_private.h"
37
38static void	pchar(int fd, char c);
39static void	pstr(int fd, const char *s);
40
41/*
42 * Write formatted output to stdout, in a thread-safe manner.
43 *
44 * Recognises the following conversions:
45 *	%c	-> char
46 *	%d	-> signed int (base 10)
47 *	%s	-> string
48 *	%u	-> unsigned int (base 10)
49 *	%x	-> unsigned int (base 16)
50 *	%p	-> unsigned int (base 16)
51 */
52void
53_thread_printf(int fd, const char *fmt, ...)
54{
55	static const char digits[16] = "0123456789abcdef";
56	va_list	 ap;
57	char buf[20];
58	char *s;
59	unsigned long r, u;
60	int c;
61	long d;
62	int islong;
63
64	va_start(ap, fmt);
65	while ((c = *fmt++)) {
66		islong = 0;
67		if (c == '%') {
68next:			c = *fmt++;
69			if (c == '\0')
70				goto out;
71			switch (c) {
72			case 'c':
73				pchar(fd, va_arg(ap, int));
74				continue;
75			case 's':
76				pstr(fd, va_arg(ap, char *));
77				continue;
78			case 'l':
79				islong = 1;
80				goto next;
81			case 'p':
82				islong = 1;
83			case 'd':
84			case 'u':
85			case 'x':
86				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
87				if (c == 'd') {
88					if (islong)
89						d = va_arg(ap, unsigned long);
90					else
91						d = va_arg(ap, unsigned);
92					if (d < 0) {
93						pchar(fd, '-');
94						u = (unsigned long)(d * -1);
95					} else
96						u = (unsigned long)d;
97				} else {
98					if (islong)
99						u = va_arg(ap, unsigned long);
100					else
101						u = va_arg(ap, unsigned);
102				}
103				s = buf;
104				do {
105					*s++ = digits[u % r];
106				} while (u /= r);
107				while (--s >= buf)
108					pchar(fd, *s);
109				continue;
110			}
111		}
112		pchar(fd, c);
113	}
114out:
115	va_end(ap);
116}
117
118/*
119 * Write a single character to stdout, in a thread-safe manner.
120 */
121static void
122pchar(int fd, char c)
123{
124
125	__sys_write(fd, &c, 1);
126}
127
128/*
129 * Write a string to stdout, in a thread-safe manner.
130 */
131static void
132pstr(int fd, const char *s)
133{
134
135	__sys_write(fd, s, strlen(s));
136}
137
138