src/complain.c

   1 /* Declaration for error-reporting function for Bison.
   2
   3    Copyright (C) 2000-2002, 2004-2006, 2009-2012 Free Software
   4    Foundation, Inc.
   5
   6    This program is free software: you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation, either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 /* Based on error.c and error.h,
  20    written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  21
  22 #include <config.h>
  23 #include "system.h"
  24
  25 #include <stdarg.h>
  26 #include <progname.h>
  27
  28 #include "complain.h"
  29 #include "files.h"
  30 #include "getargs.h"
  31
  32 warnings warnings_flag = Wconflicts_sr | Wconflicts_rr | Wother;
  33
  34 bool complaint_issued;
  35 static unsigned *indent_ptr = 0;
  36
  37 \f
  38
  39 /** Report an error message.
  40  *
  41  * \param loc     the location, defaulting to the current file,
  42  *                or the program name.
  43  * \param flags   the category for this message.
  44  * \param prefix  put before the message (e.g., "warning").
  45  * \param message the error message, a printf format string.  Iff it
  46  *                ends with ": ", then no trailing newline is printed,
  47  *                and the caller should print the remaining
  48  *                newline-terminated message to stderr.
  49  * \param args    the arguments of the format string.
  50  */
  51 static
  52 void
  53 error_message (const location *loc, warnings flags, const char *prefix,
  54                const char *message, va_list args)
  55 {
  56   (void) flags;
  57   unsigned pos = 0;
  58
  59   if (loc)
  60     pos += location_print (stderr, *loc);
  61   else
  62     pos += fprintf(stderr, "%s", current_file ? current_file : program_name);
  63   pos += fprintf(stderr, ": ");
  64
  65   if (indent_ptr)
  66     {
  67       if (!*indent_ptr)
  68         *indent_ptr = pos;
  69       else if (*indent_ptr > pos)
  70         fprintf (stderr, "%*s", *indent_ptr - pos, "");
  71       indent_ptr = 0;
  72     }
  73
  74   if (prefix)
  75     fprintf (stderr, "%s: ", prefix);
  76
  77   vfprintf (stderr, message, args);
  78   {
  79     size_t l = strlen (message);
  80     if (l < 2 || message[l-2] != ':' || message[l-1] != ' ')
  81       {
  82         putc ('\n', stderr);
  83         fflush (stderr);
  84       }
  85   }
  86 }
  87
  88 /** Raise a complaint. That can be a fatal error, a complaint or just a
  89     warning.  */
  90
  91 static inline void
  92 complains (const location *loc, warnings flags, const char *message,
  93            va_list args)
  94 {
  95   if (flags & complaint)
  96     {
  97       error_message (loc, complaint, NULL, message, args);
  98       complaint_issued = true;
  99     }
 100   else if (flags & fatal)
 101     {
 102       error_message (loc, fatal, _("fatal error"), message, args);
 103       exit (EXIT_FAILURE);
 104     }
 105   else if (flags & Wyacc)
 106     {
 107       if (yacc_flag)
 108         {
 109           error_message (loc, flags, NULL, message, args);
 110           complaint_issued = true;
 111         }
 112       else if (warnings_flag & Wyacc)
 113         {
 114           set_warning_issued ();
 115           error_message (loc, flags, _("warning"), message, args);
 116         }
 117     }
 118   else if (warnings_flag & flags)
 119     {
 120       set_warning_issued ();
 121       error_message (loc, flags, _("warning"), message, args);
 122     }
 123 }
 124
 125 void
 126 complain (warnings flags, const char *message, ...)
 127 {
 128   va_list args;
 129   va_start (args, message);
 130   complains (NULL, flags, message, args);
 131   va_end (args);
 132 }
 133
 134 void
 135 complain_at (location loc, warnings flags, const char *message, ...)
 136 {
 137   va_list args;
 138   va_start (args, message);
 139   complains (&loc, flags, message, args);
 140   va_end (args);
 141 }
 142
 143 void complain_at_indent (location loc, warnings flags, unsigned *indent,
 144                          const char *message, ...)
 145 {
 146   indent_ptr = indent;
 147
 148   va_list args;
 149   va_start (args, message);
 150   complains (&loc, flags, message, args);
 151   va_end (args);
 152 }
 153
 154 /*--------------------------------.
 155 | Report a warning, and proceed.  |
 156 `--------------------------------*/
 157
 158 void
 159 set_warning_issued (void)
 160 {
 161   static bool warning_issued = false;
 162   if (!warning_issued && (warnings_flag & Werror))
 163     {
 164       fprintf (stderr, "%s: warnings being treated as errors\n", program_name);
 165       complaint_issued = true;
 166     }
 167   warning_issued = true;
 168 }