1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <stdarg.h>
33#include <string.h>
34#include <unistd.h>
35#include <pthread.h>
36
37#include "libc_private.h"
38#include "thr_private.h"
39
40static void	pchar(int fd, char c);
41static void	pstr(int fd, const char *s);
42
43/*
44 * Write formatted output to stdout, in a thread-safe manner.
45 *
46 * Recognises the following conversions:
47 *	%c	-> char
48 *	%d	-> signed int (base 10)
49 *	%s	-> string
50 *	%u	-> unsigned int (base 10)
51 *	%x	-> unsigned int (base 16)
52 *	%p	-> unsigned int (base 16)
53 */
54void
55_thread_printf(int fd, const char *fmt, ...)
56{
57	va_list	ap;
58
59	va_start(ap, fmt);
60	_thread_vprintf(fd, fmt, ap);
61	va_end(ap);
62}
63
64void
65_thread_vprintf(int fd, const char *fmt, va_list ap)
66{
67	static const char digits[16] = "0123456789abcdef";
68	char buf[20];
69	char *s;
70	unsigned long r, u;
71	int c;
72	long d;
73	int islong, isalt;
74
75	while ((c = *fmt++)) {
76		isalt = 0;
77		islong = 0;
78		if (c == '%') {
79next:			c = *fmt++;
80			if (c == '\0')
81				return;
82			switch (c) {
83			case '#':
84				isalt = 1;
85				goto next;
86			case 'c':
87				pchar(fd, va_arg(ap, int));
88				continue;
89			case 's':
90				pstr(fd, va_arg(ap, char *));
91				continue;
92			case 'l':
93				islong = 1;
94				goto next;
95			case 'p':
96				pstr(fd, "0x");
97				islong = 1;
98				/* FALLTHROUGH */
99			case 'd':
100			case 'u':
101			case 'x':
102				if (c == 'x' && isalt)
103					pstr(fd, "0x");
104				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
105				if (c == 'd') {
106					if (islong)
107						d = va_arg(ap, unsigned long);
108					else
109						d = va_arg(ap, unsigned);
110					if (d < 0) {
111						pchar(fd, '-');
112						u = (unsigned long)(d * -1);
113					} else
114						u = (unsigned long)d;
115				} else {
116					if (islong)
117						u = va_arg(ap, unsigned long);
118					else
119						u = va_arg(ap, unsigned);
120				}
121				s = buf;
122				do {
123					*s++ = digits[u % r];
124				} while (u /= r);
125				while (--s >= buf)
126					pchar(fd, *s);
127				continue;
128			}
129		}
130		pchar(fd, c);
131	}
132}
133
134/*
135 * Write a single character to stdout, in a thread-safe manner.
136 */
137static void
138pchar(int fd, char c)
139{
140
141	__sys_write(fd, &c, 1);
142}
143
144/*
145 * Write a string to stdout, in a thread-safe manner.
146 */
147static void
148pstr(int fd, const char *s)
149{
150
151	__sys_write(fd, s, strlen(s));
152}
153
154