lib/error.c

   1 /* error.c -- error handler for noninteractive utilities
   2    Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Written by David MacKenzie.  */
  19
  20 #include <stdio.h>
  21
  22 #ifdef HAVE_VPRINTF
  23
  24 #if __STDC__
  25 #include <stdarg.h>
  26 #define VA_START(args, lastarg) va_start(args, lastarg)
  27 #else /* !__STDC__ */
  28 #include <varargs.h>
  29 #define VA_START(args, lastarg) va_start(args)
  30 #endif /* !__STDC__ */
  31
  32 #else /* !HAVE_VPRINTF */
  33
  34 #ifdef HAVE_DOPRNT
  35 #define va_alist args
  36 #define va_dcl int args;
  37 #else /* !HAVE_DOPRNT */
  38 #define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  39 #define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  40 #endif /* !HAVE_DOPRNT */
  41
  42 #endif /* !HAVE_VPRINTF */
  43
  44 #ifdef STDC_HEADERS
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #else /* !STDC_HEADERS */
  48 void exit ();
  49 #endif /* !STDC_HEADERS */
  50
  51 #ifndef HAVE_STRERROR
  52 static char *
  53 private_strerror (errnum)
  54      int errnum;
  55 {
  56   extern char *sys_errlist[];
  57   extern int sys_nerr;
  58
  59   if (errnum > 0 && errnum <= sys_nerr)
  60     return sys_errlist[errnum];
  61   return "Unknown system error";
  62 }
  63 #define strerror private_strerror
  64 #endif /* !HAVE_STRERROR */
  65
  66 /* Print the program name and error message MESSAGE, which is a printf-style
  67    format string with optional args.
  68    If ERRNUM is nonzero, print its corresponding system error message.
  69    Exit with status STATUS if it is nonzero.  */
  70 /* VARARGS */
  71 void
  72 #if defined (HAVE_VPRINTF) && __STDC__
  73 error (int status, int errnum, char *message, ...)
  74 #else /* !HAVE_VPRINTF or !__STDC__ */
  75 error (status, errnum, message, va_alist)
  76      int status;
  77      int errnum;
  78      char *message;
  79      va_dcl
  80 #endif /* !HAVE_VPRINTF or !__STDC__ */
  81 {
  82   extern char *program_name;
  83 #ifdef HAVE_VPRINTF
  84   va_list args;
  85 #endif /* HAVE_VPRINTF */
  86
  87   fprintf (stderr, "%s: ", program_name);
  88 #ifdef HAVE_VPRINTF
  89   VA_START (args, message);
  90   vfprintf (stderr, message, args);
  91   va_end (args);
  92 #else /* !HAVE_VPRINTF */
  93 #ifdef HAVE_DOPRNT
  94   _doprnt (message, &args, stderr);
  95 #else /* !HAVE_DOPRNT */
  96   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
  97 #endif /* !HAVE_DOPRNT */
  98 #endif /* !HAVE_VPRINTF */
  99   if (errnum)
 100     fprintf (stderr, ": %s", strerror (errnum));
 101   putc ('\n', stderr);
 102   fflush (stderr);
 103   if (status)
 104     exit (status);
 105 }