misc/err.c

   1 /* err.c --- 4.4BSD utility functions for error messages.
   2 Copyright (C) 1995 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <stdarg.h>
  21 #include <err.h>
  22 #include <stdlib.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26
  27 extern char *__progname;
  28
  29 #define VA(call)                                                              \
  30 {                                                                             \
  31   va_list ap;                                                                 \
  32   va_start (ap, format);                                                      \
  33   call;                                                                       \
  34   va_end (ap);                                                                \
  35 }
  36
  37 void
  38 vwarnx (const char *format, __gnuc_va_list ap)
  39 {
  40   if (__progname)
  41     fprintf (stderr, "%s: ", __progname);
  42   if (format)
  43     vfprintf (stderr, format, ap);
  44   putc ('\n', stderr);
  45 }
  46
  47 void
  48 vwarn (const char *format, __gnuc_va_list ap)
  49 {
  50   int error = errno;
  51
  52   if (__progname)
  53     fprintf (stderr, "%s: ", __progname);
  54   if (format)
  55     {
  56       vfprintf (stderr, format, ap);
  57       fputs (": ", stderr);
  58     }
  59   fprintf (stderr, "%s\n", strerror (error));
  60 }
  61
  62
  63 void
  64 warn (const char *format, ...)
  65 {
  66   VA (vwarn (format, ap))
  67 }
  68
  69 void
  70 warnx (const char *format, ...)
  71 {
  72   VA (vwarnx (format, ap))
  73 }
  74
  75 void
  76 verr (int status, const char *format, __gnuc_va_list ap)
  77 {
  78   vwarn (format, ap);
  79   exit (status);
  80 }
  81
  82 void
  83 verrx (int status, const char *format, __gnuc_va_list ap)
  84 {
  85   vwarnx (format, ap);
  86   exit (status);
  87 }
  88
  89 void
  90 err (int status, const char *format, ...)
  91 {
  92   VA (verr (status, format, ap))
  93 }
  94
  95 void
  96 errx (int status, const char *format, ...)
  97 {
  98   VA (verrx (status, format, ap))
  99 }