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 <sys/cdefs.h>
28 __FBSDID("$FreeBSD: stable/10/lib/libkse/thread/thr_printf.c 172491 2007-10-09 13:42:34Z obrien $");
29
30 #include <stdarg.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 #include "thr_private.h"
35
36 static void pchar(int fd, char c);
37 static void pstr(int fd, const char *s);
38
39 /*
40 * Write formatted output to stdout, in a thread-safe manner.
41 *
42 * Recognises the following conversions:
43 * %c -> char
44 * %d -> signed int (base 10)
45 * %s -> string
46 * %u -> unsigned int (base 10)
47 * %x -> unsigned int (base 16)
48 * %p -> unsigned int (base 16)
49 */
50 void
_thread_printf(int fd,const char * fmt,...)51 _thread_printf(int fd, const char *fmt, ...)
52 {
53 static const char digits[16] = "0123456789abcdef";
54 va_list ap;
55 char buf[20];
56 char *s;
57 unsigned long r, u;
58 int c;
59 long d;
60 int islong;
61
62 va_start(ap, fmt);
63 while ((c = *fmt++)) {
64 islong = 0;
65 if (c == '%') {
66 next: c = *fmt++;
67 if (c == '\0')
68 goto out;
69 switch (c) {
70 case 'c':
71 pchar(fd, va_arg(ap, int));
72 continue;
73 case 's':
74 pstr(fd, va_arg(ap, char *));
75 continue;
76 case 'l':
77 islong = 1;
78 goto next;
79 case 'p':
80 islong = 1;
81 case 'd':
82 case 'u':
83 case 'x':
84 r = ((c == 'u') || (c == 'd')) ? 10 : 16;
85 if (c == 'd') {
86 if (islong)
87 d = va_arg(ap, unsigned long);
88 else
89 d = va_arg(ap, unsigned);
90 if (d < 0) {
91 pchar(fd, '-');
92 u = (unsigned long)(d * -1);
93 } else
94 u = (unsigned long)d;
95 } else {
96 if (islong)
97 u = va_arg(ap, unsigned long);
98 else
99 u = va_arg(ap, unsigned);
100 }
101 s = buf;
102 do {
103 *s++ = digits[u % r];
104 } while (u /= r);
105 while (--s >= buf)
106 pchar(fd, *s);
107 continue;
108 }
109 }
110 pchar(fd, c);
111 }
112 out:
113 va_end(ap);
114 }
115
116 /*
117 * Write a single character to stdout, in a thread-safe manner.
118 */
119 static void
pchar(int fd,char c)120 pchar(int fd, char c)
121 {
122
123 __sys_write(fd, &c, 1);
124 }
125
126 /*
127 * Write a string to stdout, in a thread-safe manner.
128 */
129 static void
pstr(int fd,const char * s)130 pstr(int fd, const char *s)
131 {
132
133 __sys_write(fd, s, strlen(s));
134 }
135
136