thr_printf.c revision 301134 
1214571Sdim/*-
2214571Sdim * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org>
3214571Sdim * All rights reserved.
4214571Sdim *
5214571Sdim * Redistribution and use in source and binary forms, with or without
6214571Sdim * modification, are permitted provided that the following conditions
7214571Sdim * are met:
8214571Sdim * 1. Redistributions of source code must retain the above copyright
9214571Sdim *    notice, this list of conditions and the following disclaimer.
10214571Sdim * 2. Redistributions in binary form must reproduce the above copyright
11214571Sdim *    notice, this list of conditions and the following disclaimer in the
12214571Sdim *    documentation and/or other materials provided with the distribution.
13214571Sdim *
14214571Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15214571Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16214571Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17214571Sdim * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18214571Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19214571Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20214571Sdim * 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: head/lib/libthr/thread/thr_printf.c 301134 2016-06-01 16:09:56Z 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;
72
73	while ((c = *fmt++)) {
74		islong = 0;
75		if (c == '%') {
76next:			c = *fmt++;
77			if (c == '\0')
78				return;
79			switch (c) {
80			case 'c':
81				pchar(fd, va_arg(ap, int));
82				continue;
83			case 's':
84				pstr(fd, va_arg(ap, char *));
85				continue;
86			case 'l':
87				islong = 1;
88				goto next;
89			case 'p':
90				islong = 1;
91			case 'd':
92			case 'u':
93			case 'x':
94				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
95				if (c == 'd') {
96					if (islong)
97						d = va_arg(ap, unsigned long);
98					else
99						d = va_arg(ap, unsigned);
100					if (d < 0) {
101						pchar(fd, '-');
102						u = (unsigned long)(d * -1);
103					} else
104						u = (unsigned long)d;
105				} else {
106					if (islong)
107						u = va_arg(ap, unsigned long);
108					else
109						u = va_arg(ap, unsigned);
110				}
111				s = buf;
112				do {
113					*s++ = digits[u % r];
114				} while (u /= r);
115				while (--s >= buf)
116					pchar(fd, *s);
117				continue;
118			}
119		}
120		pchar(fd, c);
121	}
122}
123
124/*
125 * Write a single character to stdout, in a thread-safe manner.
126 */
127static void
128pchar(int fd, char c)
129{
130
131	__sys_write(fd, &c, 1);
132}
133
134/*
135 * Write a string to stdout, in a thread-safe manner.
136 */
137static void
138pstr(int fd, const char *s)
139{
140
141	__sys_write(fd, s, strlen(s));
142}
143
144