1  /* va_list error handler for noninteractive utilities
       2     Copyright (C) 2006-2007, 2009-2021 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 3 of the License, or
       7     (at your option) 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, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Eric Blake.  */
      18  
      19  #include <config.h>
      20  
      21  /* Specification.  */
      22  #include "verror.h"
      23  
      24  #include <errno.h>
      25  #include <stdarg.h>
      26  #include <stdlib.h>
      27  
      28  #include "error.h"
      29  #include "xvasprintf.h"
      30  
      31  #if ENABLE_NLS
      32  # include "gettext.h"
      33  # define _(msgid) gettext (msgid)
      34  #endif
      35  
      36  #ifndef _
      37  # define _(String) String
      38  #endif
      39  
      40  /* Print a message with 'vfprintf (stderr, FORMAT, ARGS)';
      41     if ERRNUM is nonzero, follow it with ": " and strerror (ERRNUM).
      42     If STATUS is nonzero, terminate the program with 'exit (STATUS)'.
      43     Use the globals error_print_progname and error_message_count similarly
      44     to error().  */
      45  void
      46  verror (int status, int errnum, const char *format, va_list args)
      47  {
      48    verror_at_line (status, errnum, NULL, 0, format, args);
      49  }
      50  
      51  /* Print a message with 'vfprintf (stderr, FORMAT, ARGS)';
      52     if ERRNUM is nonzero, follow it with ": " and strerror (ERRNUM).
      53     If STATUS is nonzero, terminate the program with 'exit (STATUS)'.
      54     If FNAME is not NULL, prepend the message with "FNAME:LINENO:".
      55     Use the globals error_print_progname, error_message_count, and
      56     error_one_per_line similarly to error_at_line().  */
      57  void
      58  verror_at_line (int status, int errnum, const char *file,
      59                  unsigned int line_number, const char *format, va_list args)
      60  {
      61    char *message = xvasprintf (format, args);
      62    if (message)
      63      {
      64        /* Until https://sourceware.org/bugzilla/show_bug.cgi?id=2997 is fixed,
      65           glibc violates GNU Coding Standards when the file argument to
      66           error_at_line is NULL.  */
      67        if (file)
      68          error_at_line (status, errnum, file, line_number, "%s", message);
      69        else
      70          error (status, errnum, "%s", message);
      71      }
      72    else
      73      {
      74        /* EOVERFLOW, EINVAL, and EILSEQ from xvasprintf are signs of
      75           serious programmer errors.  */
      76        error (0, errno, _("unable to display error message"));
      77        abort ();
      78      }
      79    free (message);
      80  }