1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993
5 *	The Regents of the University of California.  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 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include "namespace.h"
33#include <err.h>
34#include <errno.h>
35#include <stdarg.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include "un-namespace.h"
40
41#include "libc_private.h"
42
43static FILE *err_file; /* file to use for error output */
44static void (*err_exit)(int);
45
46/*
47 * This is declared to take a `void *' so that the caller is not required
48 * to include <stdio.h> first.  However, it is really a `FILE *', and the
49 * manual page documents it as such.
50 */
51void
52err_set_file(void *fp)
53{
54	if (fp)
55		err_file = fp;
56	else
57		err_file = stderr;
58}
59
60void
61err_set_exit(void (*ef)(int))
62{
63	err_exit = ef;
64}
65
66__weak_reference(_err, err);
67
68void
69_err(int eval, const char *fmt, ...)
70{
71	va_list ap;
72	va_start(ap, fmt);
73	verrc(eval, errno, fmt, ap);
74	va_end(ap);
75}
76
77void
78verr(int eval, const char *fmt, va_list ap)
79{
80	verrc(eval, errno, fmt, ap);
81}
82
83void
84errc(int eval, int code, const char *fmt, ...)
85{
86	va_list ap;
87	va_start(ap, fmt);
88	verrc(eval, code, fmt, ap);
89	va_end(ap);
90}
91
92void
93verrc(int eval, int code, const char *fmt, va_list ap)
94{
95	if (err_file == NULL)
96		err_set_file(NULL);
97	fprintf(err_file, "%s: ", _getprogname());
98	if (fmt != NULL) {
99		vfprintf(err_file, fmt, ap);
100		fprintf(err_file, ": ");
101	}
102	fprintf(err_file, "%s\n", strerror(code));
103	if (err_exit)
104		err_exit(eval);
105	exit(eval);
106}
107
108void
109errx(int eval, const char *fmt, ...)
110{
111	va_list ap;
112	va_start(ap, fmt);
113	verrx(eval, fmt, ap);
114	va_end(ap);
115}
116
117void
118verrx(int eval, const char *fmt, va_list ap)
119{
120	if (err_file == NULL)
121		err_set_file(NULL);
122	fprintf(err_file, "%s: ", _getprogname());
123	if (fmt != NULL)
124		vfprintf(err_file, fmt, ap);
125	fprintf(err_file, "\n");
126	if (err_exit)
127		err_exit(eval);
128	exit(eval);
129}
130
131__weak_reference(_warn, warn);
132
133void
134_warn(const char *fmt, ...)
135{
136	va_list ap;
137	va_start(ap, fmt);
138	vwarnc(errno, fmt, ap);
139	va_end(ap);
140}
141
142void
143vwarn(const char *fmt, va_list ap)
144{
145	vwarnc(errno, fmt, ap);
146}
147
148void
149warnc(int code, const char *fmt, ...)
150{
151	va_list ap;
152	va_start(ap, fmt);
153	vwarnc(code, fmt, ap);
154	va_end(ap);
155}
156
157void
158vwarnc(int code, const char *fmt, va_list ap)
159{
160	int saved_errno;
161
162	saved_errno = errno;
163	if (err_file == NULL)
164		err_set_file(NULL);
165	fprintf(err_file, "%s: ", _getprogname());
166	if (fmt != NULL) {
167		vfprintf(err_file, fmt, ap);
168		fprintf(err_file, ": ");
169	}
170	fprintf(err_file, "%s\n", strerror(code));
171	errno = saved_errno;
172}
173
174void
175warnx(const char *fmt, ...)
176{
177	va_list ap;
178	va_start(ap, fmt);
179	vwarnx(fmt, ap);
180	va_end(ap);
181}
182
183void
184vwarnx(const char *fmt, va_list ap)
185{
186	int saved_errno;
187
188	saved_errno = errno;
189	if (err_file == NULL)
190		err_set_file(NULL);
191	fprintf(err_file, "%s: ", _getprogname());
192	if (fmt != NULL)
193		vfprintf(err_file, fmt, ap);
194	fprintf(err_file, "\n");
195	errno = saved_errno;
196}
197