thr_printf.c revision 302408 
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: stable/11/lib/libthr/thread/thr_printf.c 301135 2016-06-01 16:11:09Z cem $");
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	va_list	ap;
56
57	va_start(ap, fmt);
58	_thread_vprintf(fd, fmt, ap);
59	va_end(ap);
60}
61
62void
63_thread_vprintf(int fd, const char *fmt, va_list ap)
64{
65	static const char digits[16] = "0123456789abcdef";
66	char buf[20];
67	char *s;
68	unsigned long r, u;
69	int c;
70	long d;
71	int islong, isalt;
72
73	while ((c = *fmt++)) {
74		isalt = 0;
75		islong = 0;
76		if (c == '%') {
77next:			c = *fmt++;
78			if (c == '\0')
79				return;
80			switch (c) {
81			case '#':
82				isalt = 1;
83				goto next;
84			case 'c':
85				pchar(fd, va_arg(ap, int));
86				continue;
87			case 's':
88				pstr(fd, va_arg(ap, char *));
89				continue;
90			case 'l':
91				islong = 1;
92				goto next;
93			case 'p':
94				pstr(fd, "0x");
95				islong = 1;
96			case 'd':
97			case 'u':
98			case 'x':
99				if (c == 'x' && isalt)
100					pstr(fd, "0x");
101				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
102				if (c == 'd') {
103					if (islong)
104						d = va_arg(ap, unsigned long);
105					else
106						d = va_arg(ap, unsigned);
107					if (d < 0) {
108						pchar(fd, '-');
109						u = (unsigned long)(d * -1);
110					} else
111						u = (unsigned long)d;
112				} else {
113					if (islong)
114						u = va_arg(ap, unsigned long);
115					else
116						u = va_arg(ap, unsigned);
117				}
118				s = buf;
119				do {
120					*s++ = digits[u % r];
121				} while (u /= r);
122				while (--s >= buf)
123					pchar(fd, *s);
124				continue;
125			}
126		}
127		pchar(fd, c);
128	}
129}
130
131/*
132 * Write a single character to stdout, in a thread-safe manner.
133 */
134static void
135pchar(int fd, char c)
136{
137
138	__sys_write(fd, &c, 1);
139}
140
141/*
142 * Write a string to stdout, in a thread-safe manner.
143 */
144static void
145pstr(int fd, const char *s)
146{
147
148	__sys_write(fd, s, strlen(s));
149}
150
151