thr_printf.c revision 144518 
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 144518 2005-04-02 01:20:00Z davidxu $
27 */
28
29#include <stdarg.h>
30#include <string.h>
31#include <unistd.h>
32#include <pthread.h>
33
34#include "thr_private.h"
35
36static void	pchar(int fd, char c);
37static void	pstr(int fd, const char *s);
38
39/*
40 * Write formatted output to stdout, in a thread-safe manner.
41 *
42 * Recognises the following conversions:
43 *	%c	-> char
44 *	%d	-> signed int (base 10)
45 *	%s	-> string
46 *	%u	-> unsigned int (base 10)
47 *	%x	-> unsigned int (base 16)
48 *	%p	-> unsigned int (base 16)
49 */
50void
51_thread_printf(int fd, const char *fmt, ...)
52{
53	static const char digits[16] = "0123456789abcdef";
54	va_list	 ap;
55	char buf[20];
56	char *s;
57	unsigned long r, u;
58	int c;
59	long d;
60	int islong;
61
62	va_start(ap, fmt);
63	while ((c = *fmt++)) {
64		islong = 0;
65		if (c == '%') {
66next:			c = *fmt++;
67			if (c == '\0')
68				goto out;
69			switch (c) {
70			case 'c':
71				pchar(fd, va_arg(ap, int));
72				continue;
73			case 's':
74				pstr(fd, va_arg(ap, char *));
75				continue;
76			case 'l':
77				islong = 1;
78				goto next;
79			case 'p':
80				islong = 1;
81			case 'd':
82			case 'u':
83			case 'x':
84				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
85				if (c == 'd') {
86					if (islong)
87						d = va_arg(ap, unsigned long);
88					else
89						d = va_arg(ap, unsigned);
90					if (d < 0) {
91						pchar(fd, '-');
92						u = (unsigned long)(d * -1);
93					} else
94						u = (unsigned long)d;
95				} else {
96					if (islong)
97						u = va_arg(ap, unsigned long);
98					else
99						u = va_arg(ap, unsigned);
100				}
101				s = buf;
102				do {
103					*s++ = digits[u % r];
104				} while (u /= r);
105				while (--s >= buf)
106					pchar(fd, *s);
107				continue;
108			}
109		}
110		pchar(fd, c);
111	}
112out:
113	va_end(ap);
114}
115
116/*
117 * Write a single character to stdout, in a thread-safe manner.
118 */
119static void
120pchar(int fd, char c)
121{
122
123	__sys_write(fd, &c, 1);
124}
125
126/*
127 * Write a string to stdout, in a thread-safe manner.
128 */
129static void
130pstr(int fd, const char *s)
131{
132
133	__sys_write(fd, s, strlen(s));
134}
135
136