err.c revision 331722 
1/*-
2 * Copyright (c) 1993
3 *	The Regents of the University of California.  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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)err.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/lib/libc/gen/err.c 331722 2018-03-29 02:50:57Z eadler $");
35
36#include "namespace.h"
37#include <err.h>
38#include <errno.h>
39#include <stdarg.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include "un-namespace.h"
44
45#include "libc_private.h"
46
47static FILE *err_file; /* file to use for error output */
48static void (*err_exit)(int);
49
50/*
51 * This is declared to take a `void *' so that the caller is not required
52 * to include <stdio.h> first.  However, it is really a `FILE *', and the
53 * manual page documents it as such.
54 */
55void
56err_set_file(void *fp)
57{
58	if (fp)
59		err_file = fp;
60	else
61		err_file = stderr;
62}
63
64void
65err_set_exit(void (*ef)(int))
66{
67	err_exit = ef;
68}
69
70__weak_reference(_err, err);
71
72void
73_err(int eval, const char *fmt, ...)
74{
75	va_list ap;
76	va_start(ap, fmt);
77	verrc(eval, errno, fmt, ap);
78	va_end(ap);
79}
80
81void
82verr(int eval, const char *fmt, va_list ap)
83{
84	verrc(eval, errno, fmt, ap);
85}
86
87void
88errc(int eval, int code, const char *fmt, ...)
89{
90	va_list ap;
91	va_start(ap, fmt);
92	verrc(eval, code, fmt, ap);
93	va_end(ap);
94}
95
96void
97verrc(int eval, int code, const char *fmt, va_list ap)
98{
99	if (err_file == NULL)
100		err_set_file(NULL);
101	fprintf(err_file, "%s: ", _getprogname());
102	if (fmt != NULL) {
103		vfprintf(err_file, fmt, ap);
104		fprintf(err_file, ": ");
105	}
106	fprintf(err_file, "%s\n", strerror(code));
107	if (err_exit)
108		err_exit(eval);
109	exit(eval);
110}
111
112void
113errx(int eval, const char *fmt, ...)
114{
115	va_list ap;
116	va_start(ap, fmt);
117	verrx(eval, fmt, ap);
118	va_end(ap);
119}
120
121void
122verrx(int eval, const char *fmt, va_list ap)
123{
124	if (err_file == NULL)
125		err_set_file(NULL);
126	fprintf(err_file, "%s: ", _getprogname());
127	if (fmt != NULL)
128		vfprintf(err_file, fmt, ap);
129	fprintf(err_file, "\n");
130	if (err_exit)
131		err_exit(eval);
132	exit(eval);
133}
134
135__weak_reference(_warn, warn);
136
137void
138_warn(const char *fmt, ...)
139{
140	va_list ap;
141	va_start(ap, fmt);
142	vwarnc(errno, fmt, ap);
143	va_end(ap);
144}
145
146void
147vwarn(const char *fmt, va_list ap)
148{
149	vwarnc(errno, fmt, ap);
150}
151
152void
153warnc(int code, const char *fmt, ...)
154{
155	va_list ap;
156	va_start(ap, fmt);
157	vwarnc(code, fmt, ap);
158	va_end(ap);
159}
160
161void
162vwarnc(int code, const char *fmt, va_list ap)
163{
164	if (err_file == NULL)
165		err_set_file(NULL);
166	fprintf(err_file, "%s: ", _getprogname());
167	if (fmt != NULL) {
168		vfprintf(err_file, fmt, ap);
169		fprintf(err_file, ": ");
170	}
171	fprintf(err_file, "%s\n", strerror(code));
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	if (err_file == NULL)
187		err_set_file(NULL);
188	fprintf(err_file, "%s: ", _getprogname());
189	if (fmt != NULL)
190		vfprintf(err_file, fmt, ap);
191	fprintf(err_file, "\n");
192}
193