1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 <stdarg.h>
30 #include <string.h>
31 #include <unistd.h>
32 #include <pthread.h>
33
34 #include "libc_private.h"
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
_thread_printf(int fd,const char * fmt,...)52 _thread_printf(int fd, const char *fmt, ...)
53 {
54 va_list ap;
55
56 va_start(ap, fmt);
57 _thread_vprintf(fd, fmt, ap);
58 va_end(ap);
59 }
60
61 void
_thread_vprintf(int fd,const char * fmt,va_list ap)62 _thread_vprintf(int fd, const char *fmt, va_list ap)
63 {
64 static const char digits[16] = "0123456789abcdef";
65 char buf[20];
66 char *s;
67 unsigned long r, u;
68 int c;
69 long d;
70 int islong, isalt;
71
72 while ((c = *fmt++)) {
73 isalt = 0;
74 islong = 0;
75 if (c == '%') {
76 next: c = *fmt++;
77 if (c == '\0')
78 return;
79 switch (c) {
80 case '#':
81 isalt = 1;
82 goto next;
83 case 'c':
84 pchar(fd, va_arg(ap, int));
85 continue;
86 case 's':
87 pstr(fd, va_arg(ap, char *));
88 continue;
89 case 'l':
90 islong = 1;
91 goto next;
92 case 'p':
93 pstr(fd, "0x");
94 islong = 1;
95 /* FALLTHROUGH */
96 case 'd':
97 case 'u':
98 case 'x':
99 if (c == 'x' && isalt)
100 pstr(fd, "0x");
101 r = ((c == 'u') || (c == 'd')) ? 10 : 16;
102 if (c == 'd') {
103 if (islong)
104 d = va_arg(ap, unsigned long);
105 else
106 d = va_arg(ap, unsigned);
107 if (d < 0) {
108 pchar(fd, '-');
109 u = (unsigned long)(d * -1);
110 } else
111 u = (unsigned long)d;
112 } else {
113 if (islong)
114 u = va_arg(ap, unsigned long);
115 else
116 u = va_arg(ap, unsigned);
117 }
118 s = buf;
119 do {
120 *s++ = digits[u % r];
121 } while (u /= r);
122 while (--s >= buf)
123 pchar(fd, *s);
124 continue;
125 }
126 }
127 pchar(fd, c);
128 }
129 }
130
131 /*
132 * Write a single character to stdout, in a thread-safe manner.
133 */
134 static void
pchar(int fd,char c)135 pchar(int fd, char c)
136 {
137
138 __sys_write(fd, &c, 1);
139 }
140
141 /*
142 * Write a string to stdout, in a thread-safe manner.
143 */
144 static void
pstr(int fd,const char * s)145 pstr(int fd, const char *s)
146 {
147
148 __sys_write(fd, s, strlen(s));
149 }
150
151