thr_printf.c revision 277317 
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: stable/10/lib/libthr/thread/thr_printf.c 277317 2015-01-18 11:54:20Z kib $
27 */
28
29#include <stdarg.h>
30#include <string.h>
31#include <unistd.h>
32#include <pthread.h>
33
34#include "libc_private.h"
35#include "thr_private.h"
36
37static void	pchar(int fd, char c);
38static void	pstr(int fd, const char *s);
39
40/*
41 * Write formatted output to stdout, in a thread-safe manner.
42 *
43 * Recognises the following conversions:
44 *	%c	-> char
45 *	%d	-> signed int (base 10)
46 *	%s	-> string
47 *	%u	-> unsigned int (base 10)
48 *	%x	-> unsigned int (base 16)
49 *	%p	-> unsigned int (base 16)
50 */
51void
52_thread_printf(int fd, const char *fmt, ...)
53{
54	static const char digits[16] = "0123456789abcdef";
55	va_list	 ap;
56	char buf[20];
57	char *s;
58	unsigned long r, u;
59	int c;
60	long d;
61	int islong;
62
63	va_start(ap, fmt);
64	while ((c = *fmt++)) {
65		islong = 0;
66		if (c == '%') {
67next:			c = *fmt++;
68			if (c == '\0')
69				goto out;
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 'l':
78				islong = 1;
79				goto next;
80			case 'p':
81				islong = 1;
82			case 'd':
83			case 'u':
84			case 'x':
85				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
86				if (c == 'd') {
87					if (islong)
88						d = va_arg(ap, unsigned long);
89					else
90						d = va_arg(ap, unsigned);
91					if (d < 0) {
92						pchar(fd, '-');
93						u = (unsigned long)(d * -1);
94					} else
95						u = (unsigned long)d;
96				} else {
97					if (islong)
98						u = va_arg(ap, unsigned long);
99					else
100						u = va_arg(ap, unsigned);
101				}
102				s = buf;
103				do {
104					*s++ = digits[u % r];
105				} while (u /= r);
106				while (--s >= buf)
107					pchar(fd, *s);
108				continue;
109			}
110		}
111		pchar(fd, c);
112	}
113out:
114	va_end(ap);
115}
116
117/*
118 * Write a single character to stdout, in a thread-safe manner.
119 */
120static void
121pchar(int fd, char c)
122{
123
124	__sys_write(fd, &c, 1);
125}
126
127/*
128 * Write a string to stdout, in a thread-safe manner.
129 */
130static void
131pstr(int fd, const char *s)
132{
133
134	__sys_write(fd, s, strlen(s));
135}
136
137