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  * $DragonFly: src/lib/libthread_xu/thread/thr_printf.c,v 1.1 2005/02/01 12:38:27 davidxu Exp $
27  */
28 
29 #include <sys/cdefs.h>
30 #include <stdarg.h>
31 #include <string.h>
32 #include <unistd.h>
33 #include <pthread.h>
34 
35 #include "thr_private.h"
36 
37 static void	pchar(int fd, char c);
38 static void	pstr(int fd, const char *s);
39 
40 /*
41  * Write formatted output to stdout, in a thread-safe manner.
42  *
43  * Recognises the following conversions:
44  *	%c	-> char
45  *	%d	-> signed int (base 10)
46  *	%s	-> string
47  *	%u	-> unsigned int (base 10)
48  *	%x	-> unsigned int (base 16)
49  *	%p	-> unsigned int (base 16)
50  */
51 void
52 _thread_printf(int fd, const char *fmt, ...)
53 {
54 	static const char digits[16] = "0123456789abcdef";
55 	va_list	 ap;
56 	char buf[20];
57 	char *s;
58 	unsigned long r, u;
59 	int c;
60 	long d;
61 	int islong;
62 
63 	va_start(ap, fmt);
64 	while ((c = *fmt++)) {
65 		islong = 0;
66 		if (c == '%') {
67 next:			c = *fmt++;
68 			if (c == '\0')
69 				goto out;
70 			switch (c) {
71 			case 'c':
72 				pchar(fd, va_arg(ap, int));
73 				continue;
74 			case 's':
75 				pstr(fd, va_arg(ap, char *));
76 				continue;
77 			case 'l':
78 				islong = 1;
79 				goto next;
80 			case 'p':
81 				islong = 1;
82 			case 'd':
83 			case 'u':
84 			case 'x':
85 				r = ((c == 'u') || (c == 'd')) ? 10 : 16;
86 				if (c == 'd') {
87 					if (islong)
88 						d = va_arg(ap, unsigned long);
89 					else
90 						d = va_arg(ap, unsigned);
91 					if (d < 0) {
92 						pchar(fd, '-');
93 						u = (unsigned long)(d * -1);
94 					} else
95 						u = (unsigned long)d;
96 				} else {
97 					if (islong)
98 						u = va_arg(ap, unsigned long);
99 					else
100 						u = va_arg(ap, unsigned);
101 				}
102 				s = buf;
103 				do {
104 					*s++ = digits[u % r];
105 				} while (u /= r);
106 				while (--s >= buf)
107 					pchar(fd, *s);
108 				continue;
109 			}
110 		}
111 		pchar(fd, c);
112 	}
113 out:
114 	va_end(ap);
115 }
116 
117 /*
118  * Write a single character to stdout, in a thread-safe manner.
119  */
120 static void
121 pchar(int fd, char c)
122 {
123 
124 	__sys_write(fd, &c, 1);
125 }
126 
127 /*
128  * Write a string to stdout, in a thread-safe manner.
129  */
130 static void
131 pstr(int fd, const char *s)
132 {
133 
134 	__sys_write(fd, s, strlen(s));
135 }
136 
137