misc/error.c

   1 /* error.c -- error handler for noninteractive utilities
   2    Copyright (C) 1990, 91, 92, 93, 94, 95, 96 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
  19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  20 Cambridge, MA 02139, 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 #ifndef _
  51 #define _(String) String
  52 #endif
  53
  54 /* If NULL, error will flush stdout, then print on stderr the program
  55    name, a colon and a space.  Otherwise, error will call this
  56    function without parameters instead.  */
  57 void (*error_print_progname) (
  58 #if __STDC__ - 0
  59                               void
  60 #endif
  61                               );
  62
  63 /* This variable is incremented each time `error' is called.  */
  64 unsigned int error_message_count;
  65
  66 #ifdef _LIBC
  67 /* In the GNU C library, there is a predefined variable for this.  */
  68
  69 #define program_name program_invocation_name
  70 #include <errno.h>
  71
  72 #else
  73
  74 /* The calling program should define program_name and set it to the
  75    name of the executing program.  */
  76 extern char *program_name;
  77
  78 #if HAVE_STRERROR
  79 # ifndef strerror               /* On some systems, strerror is a macro */
  80 char *strerror ();
  81 # endif
  82 #else
  83 static char *
  84 private_strerror (errnum)
  85      int errnum;
  86 {
  87   extern char *sys_errlist[];
  88   extern int sys_nerr;
  89
  90   if (errnum > 0 && errnum <= sys_nerr)
  91     return sys_errlist[errnum];
  92   return _("Unknown system error");
  93 }
  94 #define strerror private_strerror
  95 #endif  /* HAVE_STRERROR */
  96 #endif  /* _LIBC */
  97
  98 /* Print the program name and error message MESSAGE, which is a printf-style
  99    format string with optional args.
 100    If ERRNUM is nonzero, print its corresponding system error message.
 101    Exit with status STATUS if it is nonzero.  */
 102 /* VARARGS */
 103
 104 void
 105 #if defined(VA_START) && __STDC__
 106 error (int status, int errnum, const char *message, ...)
 107 #else
 108 error (status, errnum, message, va_alist)
 109      int status;
 110      int errnum;
 111      char *message;
 112      va_dcl
 113 #endif
 114 {
 115 #ifdef VA_START
 116   va_list args;
 117 #endif
 118
 119   if (error_print_progname)
 120     (*error_print_progname) ();
 121   else
 122     {
 123       fflush (stdout);
 124       fprintf (stderr, "%s: ", program_name);
 125     }
 126
 127 #ifdef VA_START
 128   VA_START (args, message);
 129 # if HAVE_VPRINTF || _LIBC
 130   vfprintf (stderr, message, args);
 131 # else
 132   _doprnt (message, args, stderr);
 133 # endif
 134   va_end (args);
 135 #else
 136   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 137 #endif
 138
 139   ++error_message_count;
 140   if (errnum)
 141     fprintf (stderr, ": %s", strerror (errnum));
 142   putc ('\n', stderr);
 143   fflush (stderr);
 144   if (status)
 145     exit (status);
 146 }
 147 \f
 148 /* Sometimes we want to have at most one error per line.  This
 149    variable controls whether this mode is selected or not.  */
 150 int error_one_per_line;
 151
 152 void
 153 #if defined(VA_START) && __STDC__
 154 error_at_line (int status, int errnum, const char *file_name,
 155                unsigned int line_number, const char *message, ...)
 156 #else
 157 error_at_line (status, errnum, file_name, line_number, message, va_alist)
 158      int status;
 159      int errnum;
 160      const char *file_name;
 161      unsigned int line_number;
 162      char *message;
 163      va_dcl
 164 #endif
 165 {
 166 #ifdef VA_START
 167   va_list args;
 168 #endif
 169
 170   if (error_one_per_line)
 171     {
 172       static const char *old_file_name;
 173       static unsigned int old_line_number;
 174
 175       if (old_line_number == line_number &&
 176           (file_name == old_file_name || !strcmp (old_file_name, file_name)))
 177         /* Simply return and print nothing.  */
 178         return;
 179
 180       old_file_name = file_name;
 181       old_line_number = line_number;
 182     }
 183
 184   if (error_print_progname)
 185     (*error_print_progname) ();
 186   else
 187     {
 188       fflush (stdout);
 189       fprintf (stderr, "%s:", program_name);
 190     }
 191
 192   if (file_name != NULL)
 193     fprintf (stderr, "%s:%d: ", file_name, line_number);
 194
 195 #ifdef VA_START
 196   VA_START (args, message);
 197 # if HAVE_VPRINTF || _LIBC
 198   vfprintf (stderr, message, args);
 199 # else
 200   _doprnt (message, args, stderr);
 201 # endif
 202   va_end (args);
 203 #else
 204   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 205 #endif
 206
 207   ++error_message_count;
 208   if (errnum)
 209     fprintf (stderr, ": %s", strerror (errnum));
 210   putc ('\n', stderr);
 211   fflush (stderr);
 212   if (status)
 213     exit (status);
 214 }