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 	static const char digits[16] = "0123456789abcdef";
52 	va_list	 ap;
53 	char buf[20];
54 	char *s;
55 	unsigned long r, u;
56 	int c;
57 	long d;
58 	int islong;
59 
60 	va_start(ap, fmt);
61 	while ((c = *fmt++)) {
62 		islong = 0;
63 		if (c == '%') {
64 next:			c = *fmt++;
65 			if (c == '\0')
66 				goto out;
67 			switch (c) {
68 			case 'c':
69 				pchar(fd, va_arg(ap, int));
70 				continue;
71 			case 's':
72 				pstr(fd, va_arg(ap, char *));
73 				continue;
74 			case 'l':
75 				islong = 1;
76 				goto next;
77 			case 'p':
78 				islong = 1;
79 			case 'd':
80 			case 'u':
81 			case 'x':
82 				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
83 				if (c == 'd') {
84 					if (islong)
85 						d = va_arg(ap, unsigned long);
86 					else
87 						d = va_arg(ap, unsigned);
88 					if (d < 0) {
89 						pchar(fd, '-');
90 						u = (unsigned long)(d * -1);
91 					} else
92 						u = (unsigned long)d;
93 				} else {
94 					if (islong)
95 						u = va_arg(ap, unsigned long);
96 					else
97 						u = va_arg(ap, unsigned);
98 				}
99 				s = buf;
100 				do {
101 					*s++ = digits[u % r];
102 				} while (u /= r);
103 				while (--s >= buf)
104 					pchar(fd, *s);
105 				continue;
106 			}
107 		}
108 		pchar(fd, c);
109 	}
110 out:
111 	va_end(ap);
112 }
113 
114 /*
115  * Write a single character to stdout, in a thread-safe manner.
116  */
117 static void
118 pchar(int fd, char c)
119 {
120 
121 	__sys_write(fd, &c, 1);
122 }
123 
124 /*
125  * Write a string to stdout, in a thread-safe manner.
126  */
127 static void
128 pstr(int fd, const char *s)
129 {
130 
131 	__sys_write(fd, s, strlen(s));
132 }
133 
134