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 #include "system.h"
  23
  24 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
  25 # ifdef __STDC__
  26 #  include <stdarg.h>
  27 #  define VA_START(args, lastarg) va_start(args, lastarg)
  28 # else
  29 #  include <varargs.h>
  30 #  define VA_START(args, lastarg) va_start(args)
  31 # endif
  32 #else
  33 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  34 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  35 #endif
  36
  37 #if STDC_HEADERS || _LIBC
  38 # include <stdlib.h>
  39 # include <string.h>
  40 #else
  41 void exit ();
  42 #endif
  43
  44 #include "complain.h"
  45
  46 #ifndef HAVE_DECL_STRERROR_R
  47 "this configure-time declaration test was not run"
  48 #endif
  49 #if !HAVE_DECL_STRERROR_R
  50 char *strerror_r ();
  51 #endif
  52
  53 #ifndef _
  54 # define _(String) String
  55 #endif
  56
  57 #ifdef _LIBC
  58 /* In the GNU C library, there is a predefined variable for this.  */
  59
  60 # define program_name program_invocation_name
  61 # include <errno.h>
  62
  63 /* In GNU libc we want do not want to use the common name `error' directly.
  64    Instead make it a weak alias.  */
  65 # define error __error
  66 # define error_at_line __error_at_line
  67
  68 # ifdef USE_IN_LIBIO
  69 #  include <libio/iolibio.h>
  70 #  define fflush(s) _IO_fflush (s)
  71 # endif
  72
  73 #else /* not _LIBC */
  74
  75 /* The calling program should define program_name and set it to the
  76    name of the executing program.  */
  77 extern char *program_name;
  78
  79 # ifdef HAVE_STRERROR_R
  80 #  define __strerror_r strerror_r
  81 # else
  82 #  if HAVE_STRERROR
  83 #   ifndef strerror             /* On some systems, strerror is a macro */
  84 char *strerror ();
  85 #   endif
  86 #  else
  87 static char *
  88 private_strerror (errnum)
  89      int errnum;
  90 {
  91   extern char *sys_errlist[];
  92   extern int sys_nerr;
  93
  94   if (errnum > 0 && errnum <= sys_nerr)
  95     return _(sys_errlist[errnum]);
  96   return _("Unknown system error");
  97 }
  98 #   define strerror private_strerror
  99 #  endif /* HAVE_STRERROR */
 100 # endif /* HAVE_STRERROR_R */
 101 #endif  /* not _LIBC */
 102
 103 /* This variable is incremented each time `warn' is called.  */
 104 unsigned int warn_message_count;
 105
 106 /* This variable is incremented each time `complain' is called.  */
 107 unsigned int complain_message_count;
 108
 109 /* Sometimes we want to have at most one error per line.  This
 110    variable controls whether this mode is selected or not.  */
 111 int error_one_per_line;
 112 \f
 113 /*--------------------------------.
 114 | Report a warning, and proceed.  |
 115 `--------------------------------*/
 116
 117 void
 118 #if defined VA_START && defined __STDC__
 119 warn (const char *message, ...)
 120 #else
 121 warn (message, va_alist)
 122      char *message;
 123      va_dcl
 124 #endif
 125 {
 126 #ifdef VA_START
 127   va_list args;
 128 #endif
 129
 130   if (error_one_per_line)
 131     {
 132       static const char *old_infile;
 133       static int old_lineno;
 134
 135       if (old_lineno == lineno &&
 136           (infile == old_infile || !strcmp (old_infile, infile)))
 137         /* Simply return and print nothing.  */
 138         return;
 139
 140       old_infile = infile;
 141       old_lineno = lineno;
 142     }
 143
 144   fflush (stdout);
 145   if (infile != NULL)
 146     fprintf (stderr, "%s:%d: ", infile, lineno);
 147   else
 148     fprintf (stderr, "%s:", program_name);
 149
 150   fputs (_("warning: "), stderr);
 151
 152 #ifdef VA_START
 153   VA_START (args, message);
 154   vfprintf (stderr, message, args);
 155   va_end (args);
 156 #else
 157   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 158 #endif
 159
 160   ++warn_message_count;
 161   putc ('\n', stderr);
 162   fflush (stderr);
 163 }
 164 \f
 165 /*-----------------------------------------------------------.
 166 | An error has occurred, but we can proceed, and die later.  |
 167 `-----------------------------------------------------------*/
 168
 169 void
 170 #if defined VA_START && defined __STDC__
 171 complain (const char *message, ...)
 172 #else
 173 complain (message, va_alist)
 174      char *message;
 175      va_dcl
 176 #endif
 177 {
 178 #ifdef VA_START
 179   va_list args;
 180 #endif
 181
 182   if (error_one_per_line)
 183     {
 184       static const char *old_infile;
 185       static int old_lineno;
 186
 187       if (old_lineno == lineno &&
 188           (infile == old_infile || !strcmp (old_infile, infile)))
 189         /* Simply return and print nothing.  */
 190         return;
 191
 192       old_infile = infile;
 193       old_lineno = lineno;
 194     }
 195
 196   fflush (stdout);
 197   if (infile != NULL)
 198     fprintf (stderr, "%s:%d: ", infile, lineno);
 199   else
 200     fprintf (stderr, "%s:", program_name);
 201
 202 #ifdef VA_START
 203   VA_START (args, message);
 204   vfprintf (stderr, message, args);
 205   va_end (args);
 206 #else
 207   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 208 #endif
 209
 210   ++complain_message_count;
 211   putc ('\n', stderr);
 212   fflush (stderr);
 213 }
 214 \f
 215 /*-------------------------------------------------.
 216 | A severe error has occurred, we cannot proceed.  |
 217 `-------------------------------------------------*/
 218
 219 void
 220 #if defined VA_START && defined __STDC__
 221 fatal (const char *message, ...)
 222 #else
 223 fatal (message, va_alist)
 224      char *message;
 225      va_dcl
 226 #endif
 227 {
 228 #ifdef VA_START
 229   va_list args;
 230 #endif
 231
 232   fflush (stdout);
 233   if (infile != NULL)
 234     fprintf (stderr, "%s:%d: ", infile, lineno);
 235   else
 236     fprintf (stderr, "%s:", program_name);
 237
 238   fputs (_("fatal error: "), stderr);
 239
 240 #ifdef VA_START
 241   VA_START (args, message);
 242   vfprintf (stderr, message, args);
 243   va_end (args);
 244 #else
 245   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 246 #endif
 247   putc ('\n', stderr);
 248   fflush (stderr);
 249   exit (1);
 250 }
 251 \f
 252 /*------------------------------------------------------------------.
 253 | A severe error has occurred, we cannot proceed. Exit with STATUS, |
 254 | and report the error message of the errno ERRNUM.                 |
 255 `------------------------------------------------------------------*/
 256
 257 void
 258 #if defined VA_START && defined __STDC__
 259 error (int status, int errnum,
 260        const char *message, ...)
 261 #else
 262 error (status, errnum, message, va_alist)
 263      int status;
 264      int errnum;
 265      char *message;
 266      va_dcl
 267 #endif
 268 {
 269 #ifdef VA_START
 270   va_list args;
 271 #endif
 272
 273   fflush (stdout);
 274   if (infile != NULL)
 275     fprintf (stderr, "%s:%d: ", infile, lineno);
 276   else
 277     fprintf (stderr, "%s:", program_name);
 278
 279   fputs (_("fatal error: "), stderr);
 280
 281 #ifdef VA_START
 282   VA_START (args, message);
 283   vfprintf (stderr, message, args);
 284   va_end (args);
 285 #else
 286   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 287 #endif
 288
 289   if (errnum)
 290     {
 291 #if defined HAVE_STRERROR_R || _LIBC
 292       char errbuf[1024];
 293 # if HAVE_WORKING_STRERROR_R || _LIBC
 294       fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
 295 # else
 296       /* Don't use __strerror_r's return value because on some systems
 297          (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'.  */
 298       __strerror_r (errnum, errbuf, sizeof errbuf);
 299       fprintf (stderr, ": %s", errbuf);
 300 # endif
 301 #else
 302       fprintf (stderr, ": %s", strerror (errnum));
 303 #endif
 304     }
 305   putc ('\n', stderr);
 306   fflush (stderr);
 307   if (status)
 308     exit (status);
 309 }