src/complain.c

   1 /* Declaration for error-reporting function for Bison.
   2    Copyright 2000 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU General Public License as published by the
   6    Free Software Foundation; either version 2, or (at your option) any
   7    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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17    USA.  */
  18
  19 /* Based on error.c and error.h,
  20    written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27
  28 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
  29 # if __STDC__
  30 #  include <stdarg.h>
  31 #  define VA_START(args, lastarg) va_start(args, lastarg)
  32 # else
  33 #  include <varargs.h>
  34 #  define VA_START(args, lastarg) va_start(args)
  35 # endif
  36 #else
  37 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  38 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  39 #endif
  40
  41 #if STDC_HEADERS || _LIBC
  42 # include <stdlib.h>
  43 # include <string.h>
  44 #else
  45 void exit ();
  46 #endif
  47
  48 #include "complain.h"
  49
  50 #ifndef _
  51 # define _(String) String
  52 #endif
  53
  54 #ifdef _LIBC
  55 /* In the GNU C library, there is a predefined variable for this.  */
  56 # define program_name program_invocation_name
  57 #else /* not _LIBC */
  58 /* The calling program should define program_name and set it to the
  59    name of the executing program.  */
  60 extern char *program_name;
  61 #endif
  62
  63 /* This variable is incremented each time `warn' is called.  */
  64 unsigned int warn_message_count;
  65
  66 /* This variable is incremented each time `complain' is called.  */
  67 unsigned int complain_message_count;
  68
  69 /* Sometimes we want to have at most one error per line.  This
  70    variable controls whether this mode is selected or not.  */
  71 int error_one_per_line;
  72 \f
  73 /*--------------------------------.
  74 | Report a warning, and proceed.  |
  75 `--------------------------------*/
  76
  77 void
  78 #if defined VA_START && __STDC__
  79 warn (const char *message, ...)
  80 #else
  81 warn (message, va_alist)
  82      char *message;
  83      va_dcl
  84 #endif
  85 {
  86 #ifdef VA_START
  87   va_list args;
  88 #endif
  89
  90   if (error_one_per_line)
  91     {
  92       static const char *old_infile;
  93       static int old_lineno;
  94
  95       if (old_lineno == lineno &&
  96           (infile == old_infile || !strcmp (old_infile, infile)))
  97         /* Simply return and print nothing.  */
  98         return;
  99
 100       old_infile = infile;
 101       old_lineno = lineno;
 102     }
 103
 104   fflush (stdout);
 105   if (infile != NULL)
 106     fprintf (stderr, "%s:%d: ", infile, lineno);
 107   else
 108     fprintf (stderr, "%s:", program_name);
 109
 110   fputs (_("warning: "), stderr);
 111
 112 #ifdef VA_START
 113   VA_START (args, message);
 114   vfprintf (stderr, message, args);
 115   va_end (args);
 116 #else
 117   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 118 #endif
 119
 120   ++warn_message_count;
 121   putc ('\n', stderr);
 122   fflush (stderr);
 123 }
 124 \f
 125 /*-----------------------------------------------------------.
 126 | An error has occurred, but we can proceed, and die later.  |
 127 `-----------------------------------------------------------*/
 128
 129 void
 130 #if defined VA_START && __STDC__
 131 complain (const char *message, ...)
 132 #else
 133 complain (message, va_alist)
 134      char *message;
 135      va_dcl
 136 #endif
 137 {
 138 #ifdef VA_START
 139   va_list args;
 140 #endif
 141
 142   if (error_one_per_line)
 143     {
 144       static const char *old_infile;
 145       static int old_lineno;
 146
 147       if (old_lineno == lineno &&
 148           (infile == old_infile || !strcmp (old_infile, infile)))
 149         /* Simply return and print nothing.  */
 150         return;
 151
 152       old_infile = infile;
 153       old_lineno = lineno;
 154     }
 155
 156   fflush (stdout);
 157   if (infile != NULL)
 158     fprintf (stderr, "%s:%d: ", infile, lineno);
 159   else
 160     fprintf (stderr, "%s:", program_name);
 161
 162 #ifdef VA_START
 163   VA_START (args, message);
 164   vfprintf (stderr, message, args);
 165   va_end (args);
 166 #else
 167   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 168 #endif
 169
 170   ++complain_message_count;
 171   putc ('\n', stderr);
 172   fflush (stderr);
 173 }
 174 \f
 175 /*-------------------------------------------------.
 176 | A severe error has occurred, we cannot proceed.  |
 177 `-------------------------------------------------*/
 178
 179 void
 180 #if defined VA_START && __STDC__
 181 fatal (const char *message, ...)
 182 #else
 183 fatal (message, va_alist)
 184      char *message;
 185      va_dcl
 186 #endif
 187 {
 188 #ifdef VA_START
 189   va_list args;
 190 #endif
 191
 192   fflush (stdout);
 193   if (infile != NULL)
 194     fprintf (stderr, "%s:%d: ", infile, lineno);
 195   else
 196     fprintf (stderr, "%s:", program_name);
 197
 198   fputs (_("fatal error: "), stderr);
 199
 200 #ifdef VA_START
 201   VA_START (args, message);
 202   vfprintf (stderr, message, args);
 203   va_end (args);
 204 #else
 205   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 206 #endif
 207   putc ('\n', stderr);
 208   fflush (stderr);
 209   exit (1);
 210 }
 211 \f
 212 /*------------------------------------------------------------------.
 213 | A severe error has occurred, we cannot proceed. Exit with STATUS, |
 214 | and report the error message of the errno ERRNUM.                 |
 215 `------------------------------------------------------------------*/
 216
 217 void
 218 #if defined VA_START && __STDC__
 219 error (int status, int errnum,
 220        const char *message, ...)
 221 #else
 222 error (status, errnum, message, va_alist)
 223      int status;
 224      int errnum;
 225      char *message;
 226      va_dcl
 227 #endif
 228 {
 229 #ifdef VA_START
 230   va_list args;
 231 #endif
 232
 233   fflush (stdout);
 234   if (infile != NULL)
 235     fprintf (stderr, "%s:%d: ", infile, lineno);
 236   else
 237     fprintf (stderr, "%s:", program_name);
 238
 239   fputs (_("fatal error: "), stderr);
 240
 241 #ifdef VA_START
 242   VA_START (args, message);
 243   vfprintf (stderr, message, args);
 244   va_end (args);
 245 #else
 246   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 247 #endif
 248
 249   if (errnum)
 250     {
 251 #if defined HAVE_STRERROR_R || _LIBC
 252       char errbuf[1024];
 253 # if HAVE_WORKING_STRERROR_R || _LIBC
 254       fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
 255 # else
 256       /* Don't use __strerror_r's return value because on some systems
 257          (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'.  */
 258       __strerror_r (errnum, errbuf, sizeof errbuf);
 259       fprintf (stderr, ": %s", errbuf);
 260 # endif
 261 #else
 262       fprintf (stderr, ": %s", strerror (errnum));
 263 #endif
 264     }
 265   putc ('\n', stderr);
 266   fflush (stderr);
 267   if (status)
 268     exit (status);
 269 }