thr_printf.c revision 116103 
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 116103 2003-06-09 17:58:15Z mtm $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/lib/libthr/thread/thr_printf.c 116103 2003-06-09 17:58:15Z mtm $");
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 <string.h>
38#include <unistd.h>
39#include <pthread.h>
40
41#include "thr_private.h"
42
43static void	pchar(int fd, char c);
44static void	pstr(int fd, const char *s);
45
46/*
47 * Write formatted output to stdout, in a thread-safe manner.
48 *
49 * Recognises the following conversions:
50 *	%c	-> char
51 *	%d	-> signed int (base 10)
52 *	%s	-> string
53 *	%u	-> unsigned int (base 10)
54 *	%x	-> unsigned int (base 16)
55 *	%p	-> unsigned int (base 16)
56 */
57void
58_thread_printf(int fd, const char *fmt, ...)
59{
60	static const char digits[16] = "0123456789abcdef";
61	va_list	 ap;
62	char buf[10];
63	char *s;
64	unsigned r, u;
65	int c, d;
66
67	va_start(ap, fmt);
68	while ((c = *fmt++)) {
69		if (c == '%') {
70			c = *fmt++;
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 'd':
79			case 'u':
80			case 'p':
81			case 'x':
82				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
83				if (c == 'd') {
84					d = va_arg(ap, unsigned);
85					if (d < 0) {
86						pchar(fd, '-');
87						u = (unsigned)(d * -1);
88					} else
89						u = (unsigned)d;
90				} else
91					u = va_arg(ap, unsigned);
92				s = buf;
93				do {
94					*s++ = digits[u % r];
95				} while (u /= r);
96				while (--s >= buf)
97					pchar(fd, *s);
98				continue;
99			}
100		}
101		pchar(fd, c);
102	}
103	va_end(ap);
104}
105
106/*
107 * Write a single character to stdout, in a thread-safe manner.
108 */
109static void
110pchar(int fd, char c)
111{
112
113	__sys_write(fd, &c, 1);
114}
115
116/*
117 * Write a string to stdout, in a thread-safe manner.
118 */
119static void
120pstr(int fd, const char *s)
121{
122
123	__sys_write(fd, s, strlen(s));
124}
125
126