thr_printf.c revision 112918 
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 * $FreeBSD: head/lib/libthr/thread/thr_printf.c 112918 2003-04-01 03:46:29Z jeff $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/lib/libthr/thread/thr_printf.c 112918 2003-04-01 03:46:29Z jeff $");
31
32#include <sys/types.h>
33#include <sys/fcntl.h>
34#include <sys/uio.h>
35#include <errno.h>
36#include <stdarg.h>
37#include <unistd.h>
38#include <pthread.h>
39
40#include "thr_private.h"
41
42static void	pchar(int fd, char c);
43static void	pstr(int fd, const char *s);
44
45/*
46 * Write formatted output to stdout, in a thread-safe manner.
47 *
48 * Recognises the following conversions:
49 *	%c	-> char
50 *	%d	-> signed int (base 10)
51 *	%s	-> string
52 *	%u	-> unsigned int (base 10)
53 *	%x	-> unsigned int (base 16)
54 *	%p	-> unsigned int (base 16)
55 */
56void
57_thread_printf(int fd, const char *fmt, ...)
58{
59	static const char digits[16] = "0123456789abcdef";
60	va_list	 ap;
61	char buf[10];
62	char *s;
63	unsigned r, u;
64	int c, d;
65
66	va_start(ap, fmt);
67	while ((c = *fmt++)) {
68		if (c == '%') {
69			c = *fmt++;
70			switch (c) {
71			case 'c':
72				pchar(fd, va_arg(ap, int));
73				continue;
74			case 's':
75				pstr(fd, va_arg(ap, char *));
76				continue;
77			case 'd':
78			case 'u':
79			case 'p':
80			case 'x':
81				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
82				if (c == 'd') {
83					d = va_arg(ap, unsigned);
84					if (d < 0) {
85						pchar(fd, '-');
86						u = (unsigned)(d * -1);
87					} else
88						u = (unsigned)d;
89				} else
90					u = va_arg(ap, unsigned);
91				s = buf;
92				do {
93					*s++ = digits[u % r];
94				} while (u /= r);
95				while (--s >= buf)
96					pchar(fd, *s);
97				continue;
98			}
99		}
100		pchar(fd, c);
101	}
102	va_end(ap);
103}
104
105/*
106 * Write a single character to stdout, in a thread-safe manner.
107 */
108static void
109pchar(int fd, char c)
110{
111
112	write(fd, &c, 1);
113}
114
115/*
116 * Write a string to stdout, in a thread-safe manner.
117 */
118static void
119pstr(int fd, const char *s)
120{
121
122	write(fd, s, strlen(s));
123}
124
125