lib/libc/gen/err.c

   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  * 3. 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  * @(#)err.c    8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/gen/err.c,v 1.15 2008/04/03 20:36:44 imp Exp $
  31  */
  32
  33 #include "namespace.h"
  34 #include <err.h>
  35 #include <errno.h>
  36 #include <stdarg.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include "un-namespace.h"
  41
  42 #include "libc_private.h"
  43
  44 static FILE *err_file; /* file to use for error output */
  45 static void (*err_exit)(int);
  46
  47 /*
  48  * This is declared to take a `void *' so that the caller is not required
  49  * to include <stdio.h> first.  However, it is really a `FILE *', and the
  50  * manual page documents it as such.
  51  */
  52 void
  53 err_set_file(void *fp)
  54 {
  55         if (fp)
  56                 err_file = fp;
  57         else
  58                 err_file = stderr;
  59 }
  60
  61 void
  62 err_set_exit(void (*ef)(int))
  63 {
  64         err_exit = ef;
  65 }
  66
  67 void _err(int, const char *, ...) __printflike(2, 3);
  68
  69 void
  70 _err(int eval, const char *fmt, ...)
  71 {
  72         va_list ap;
  73         va_start(ap, fmt);
  74         verrc(eval, errno, fmt, ap);
  75         va_end(ap);
  76 }
  77
  78 __weak_reference(_err, err);
  79
  80 void
  81 verr(int eval, const char *fmt, va_list ap)
  82 {
  83         verrc(eval, errno, fmt, ap);
  84 }
  85
  86 void
  87 errc(int eval, int code, const char *fmt, ...)
  88 {
  89         va_list ap;
  90         va_start(ap, fmt);
  91         verrc(eval, code, fmt, ap);
  92         va_end(ap);
  93 }
  94
  95 void
  96 verrc(int eval, int code, const char *fmt, va_list ap)
  97 {
  98         if (err_file == NULL)
  99                 err_set_file(NULL);
 100         fprintf(err_file, "%s: ", _getprogname());
 101         if (fmt != NULL) {
 102                 vfprintf(err_file, fmt, ap);
 103                 fprintf(err_file, ": ");
 104         }
 105         fprintf(err_file, "%s\n", strerror(code));
 106         if (err_exit)
 107                 err_exit(eval);
 108         exit(eval);
 109 }
 110
 111 void
 112 errx(int eval, const char *fmt, ...)
 113 {
 114         va_list ap;
 115         va_start(ap, fmt);
 116         verrx(eval, fmt, ap);
 117         va_end(ap);
 118 }
 119
 120 void
 121 verrx(int eval, const char *fmt, va_list ap)
 122 {
 123         if (err_file == NULL)
 124                 err_set_file(NULL);
 125         fprintf(err_file, "%s: ", _getprogname());
 126         if (fmt != NULL)
 127                 vfprintf(err_file, fmt, ap);
 128         fprintf(err_file, "\n");
 129         if (err_exit)
 130                 err_exit(eval);
 131         exit(eval);
 132 }
 133
 134 void _warn(const char *, ...) __printflike(1, 2);
 135
 136 void
 137 _warn(const char *fmt, ...)
 138 {
 139         va_list ap;
 140         va_start(ap, fmt);
 141         vwarnc(errno, fmt, ap);
 142         va_end(ap);
 143 }
 144
 145 __weak_reference(_warn, warn);
 146
 147 void
 148 vwarn(const char *fmt, va_list ap)
 149 {
 150         vwarnc(errno, fmt, ap);
 151 }
 152
 153 void
 154 warnc(int code, const char *fmt, ...)
 155 {
 156         va_list ap;
 157         va_start(ap, fmt);
 158         vwarnc(code, fmt, ap);
 159         va_end(ap);
 160 }
 161
 162 void
 163 vwarnc(int code, const char *fmt, va_list ap)
 164 {
 165         if (err_file == NULL)
 166                 err_set_file(NULL);
 167         fprintf(err_file, "%s: ", _getprogname());
 168         if (fmt != NULL) {
 169                 vfprintf(err_file, fmt, ap);
 170                 fprintf(err_file, ": ");
 171         }
 172         fprintf(err_file, "%s\n", strerror(code));
 173 }
 174
 175 void
 176 warnx(const char *fmt, ...)
 177 {
 178         va_list ap;
 179         va_start(ap, fmt);
 180         vwarnx(fmt, ap);
 181         va_end(ap);
 182 }
 183
 184 void
 185 vwarnx(const char *fmt, va_list ap)
 186 {
 187         if (err_file == NULL)
 188                 err_set_file(NULL);
 189         fprintf(err_file, "%s: ", _getprogname());
 190         if (fmt != NULL)
 191                 vfprintf(err_file, fmt, ap);
 192         fprintf(err_file, "\n");
 193 }