misc/error.c

   1 /* Error handler for noninteractive utilities
   2    Copyright (C) 1990,91,92,93,94,95,96,97 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU C Library.  Its master source is NOT part of
   5    the C library, however.  The master source lives in /gd/gnu/lib.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29
  30 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
  31 # if __STDC__
  32 #  include <stdarg.h>
  33 #  define VA_START(args, lastarg) va_start(args, lastarg)
  34 # else
  35 #  include <varargs.h>
  36 #  define VA_START(args, lastarg) va_start(args)
  37 # endif
  38 #else
  39 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  40 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  41 #endif
  42
  43 #if STDC_HEADERS || _LIBC
  44 # include <stdlib.h>
  45 # include <string.h>
  46 #else
  47 void exit ();
  48 #endif
  49
  50 #include "error.h"
  51
  52 #ifndef _
  53 #define _(String) String
  54 #endif
  55
  56 /* If NULL, error will flush stdout, then print on stderr the program
  57    name, a colon and a space.  Otherwise, error will call this
  58    function without parameters instead.  */
  59 void (*error_print_progname) (
  60 #if __STDC__ - 0
  61                               void
  62 #endif
  63                               );
  64
  65 /* This variable is incremented each time `error' is called.  */
  66 unsigned int error_message_count;
  67
  68 #ifdef _LIBC
  69 /* In the GNU C library, there is a predefined variable for this.  */
  70
  71 #define program_name program_invocation_name
  72 #include <errno.h>
  73
  74 #else
  75
  76 /* The calling program should define program_name and set it to the
  77    name of the executing program.  */
  78 extern char *program_name;
  79
  80 #ifndef HAVE_STRERROR_R
  81 # if HAVE_STRERROR
  82 #  ifndef strerror              /* On some systems, strerror is a macro */
  83 char *strerror ();
  84 #  endif
  85 # else
  86 static char *
  87 private_strerror (errnum)
  88      int errnum;
  89 {
  90   extern char *sys_errlist[];
  91   extern int sys_nerr;
  92
  93   if (errnum > 0 && errnum <= sys_nerr)
  94     return _(sys_errlist[errnum]);
  95   return _("Unknown system error");
  96 }
  97 #  define strerror private_strerror
  98 # endif /* HAVE_STRERROR */
  99 #endif  /* HAVE_STRERROR_R */
 100 #endif  /* _LIBC */
 101
 102 /* Print the program name and error message MESSAGE, which is a printf-style
 103    format string with optional args.
 104    If ERRNUM is nonzero, print its corresponding system error message.
 105    Exit with status STATUS if it is nonzero.  */
 106 /* VARARGS */
 107
 108 void
 109 #if defined(VA_START) && __STDC__
 110 error (int status, int errnum, const char *message, ...)
 111 #else
 112 error (status, errnum, message, va_alist)
 113      int status;
 114      int errnum;
 115      char *message;
 116      va_dcl
 117 #endif
 118 {
 119 #ifdef VA_START
 120   va_list args;
 121 #endif
 122
 123   if (error_print_progname)
 124     (*error_print_progname) ();
 125   else
 126     {
 127       fflush (stdout);
 128       fprintf (stderr, "%s: ", program_name);
 129     }
 130
 131 #ifdef VA_START
 132   VA_START (args, message);
 133 # if HAVE_VPRINTF || _LIBC
 134   vfprintf (stderr, message, args);
 135 # else
 136   _doprnt (message, args, stderr);
 137 # endif
 138   va_end (args);
 139 #else
 140   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 141 #endif
 142
 143   ++error_message_count;
 144   if (errnum)
 145     {
 146 #if defined HAVE_STRERROR_R || defined _LIBC
 147       char errbuf[1024];
 148       fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
 149 #else
 150       fprintf (stderr, ": %s", strerror (errnum));
 151 #endif
 152     }
 153   putc ('\n', stderr);
 154   fflush (stderr);
 155   if (status)
 156     exit (status);
 157 }
 158 \f
 159 /* Sometimes we want to have at most one error per line.  This
 160    variable controls whether this mode is selected or not.  */
 161 int error_one_per_line;
 162
 163 void
 164 #if defined(VA_START) && __STDC__
 165 error_at_line (int status, int errnum, const char *file_name,
 166                unsigned int line_number, const char *message, ...)
 167 #else
 168 error_at_line (status, errnum, file_name, line_number, message, va_alist)
 169      int status;
 170      int errnum;
 171      const char *file_name;
 172      unsigned int line_number;
 173      char *message;
 174      va_dcl
 175 #endif
 176 {
 177 #ifdef VA_START
 178   va_list args;
 179 #endif
 180
 181   if (error_one_per_line)
 182     {
 183       static const char *old_file_name;
 184       static unsigned int old_line_number;
 185
 186       if (old_line_number == line_number &&
 187           (file_name == old_file_name || !strcmp (old_file_name, file_name)))
 188         /* Simply return and print nothing.  */
 189         return;
 190
 191       old_file_name = file_name;
 192       old_line_number = line_number;
 193     }
 194
 195   if (error_print_progname)
 196     (*error_print_progname) ();
 197   else
 198     {
 199       fflush (stdout);
 200       fprintf (stderr, "%s:", program_name);
 201     }
 202
 203   if (file_name != NULL)
 204     fprintf (stderr, "%s:%d: ", file_name, line_number);
 205
 206 #ifdef VA_START
 207   VA_START (args, message);
 208 # if HAVE_VPRINTF || _LIBC
 209   vfprintf (stderr, message, args);
 210 # else
 211   _doprnt (message, args, stderr);
 212 # endif
 213   va_end (args);
 214 #else
 215   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 216 #endif
 217
 218   ++error_message_count;
 219   if (errnum)
 220     {
 221 #if defined HAVE_STRERROR_R || defined _LIBC
 222       char errbuf[1024];
 223       fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
 224 #else
 225       fprintf (stderr, ": %s", strerror (errnum));
 226 #endif
 227     }
 228   putc ('\n', stderr);
 229   fflush (stderr);
 230   if (status)
 231     exit (status);
 232 }