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 <stdarg.h>
28 #include <string.h>
29 #include <unistd.h>
30 #include <pthread.h>
31 
32 #include "thr_private.h"
33 
34 static void	pchar(int fd, char c);
35 static void	pstr(int fd, const char *s);
36 
37 /*
38  * Write formatted output to stdout, in a thread-safe manner.
39  *
40  * Recognises the following conversions:
41  *	%c	-> char
42  *	%d	-> signed int (base 10)
43  *	%s	-> string
44  *	%u	-> unsigned int (base 10)
45  *	%x	-> unsigned int (base 16)
46  *	%p	-> unsigned int (base 16)
47  */
48 void
49 _thread_printf(int fd, const char *fmt, ...)
50 {
51 	va_list ap;
52 
53 	va_start(ap, fmt);
54 	_thread_vprintf(fd, fmt, ap);
55 	va_end(ap);
56 }
57 
58 void
59 _thread_vprintf(int fd, const char *fmt, va_list ap)
60 {
61 	static const char digits[16] = "0123456789abcdef";
62 	char buf[20];
63 	char *s;
64 	unsigned long r, u;
65 	int c;
66 	long d;
67 	int islong;
68 
69 	while ((c = *fmt++)) {
70 		islong = 0;
71 		if (c == '%') {
72 next:			c = *fmt++;
73 			if (c == '\0')
74 				return;
75 			switch (c) {
76 			case 'c':
77 				pchar(fd, va_arg(ap, int));
78 				continue;
79 			case 's':
80 				pstr(fd, va_arg(ap, char *));
81 				continue;
82 			case 'l':
83 				islong = 1;
84 				goto next;
85 			case 'p':
86 				islong = 1;
87 			case 'd':
88 			case 'u':
89 			case 'x':
90 				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
91 				if (c == 'd') {
92 					if (islong)
93 						d = va_arg(ap, unsigned long);
94 					else
95 						d = va_arg(ap, unsigned);
96 					if (d < 0) {
97 						pchar(fd, '-');
98 						u = (unsigned long)(d * -1);
99 					} else
100 						u = (unsigned long)d;
101 				} else {
102 					if (islong)
103 						u = va_arg(ap, unsigned long);
104 					else
105 						u = va_arg(ap, unsigned);
106 				}
107 				s = buf;
108 				do {
109 					*s++ = digits[u % r];
110 				} while (u /= r);
111 				while (--s >= buf)
112 					pchar(fd, *s);
113 				continue;
114 			}
115 		}
116 		pchar(fd, c);
117 	}
118 }
119 
120 /*
121  * Write a single character to stdout, in a thread-safe manner.
122  */
123 static void
124 pchar(int fd, char c)
125 {
126 
127 	__sys_write(fd, &c, 1);
128 }
129 
130 /*
131  * Write a string to stdout, in a thread-safe manner.
132  */
133 static void
134 pstr(int fd, const char *s)
135 {
136 
137 	__sys_write(fd, s, strlen(s));
138 }
139 
140