Clean the error reporting functions.

* src/report.c: New file.
* src/report.h: Likewise.
* src/Makefile.am: Adjust.
* m4/error.m4: New file.
* m4/Makefile.am: Adjust.
* configure.in (jm_PREREQ_ERROR): Call it.
* src/main.c (int_to_string, banner, fatal_banner, warn_banner):
Remove.
(fatal, fatals): Remove.  All callers use complain.c::fatal.
(warn, warni, warns, warnss, warnss): Remove.  All callers use
complain.c::complain.
(toomany): Remove, use fatal instead.
* src/files.c (done): No argument, use complain_message_count.
* src/main.c (main): Register `done' to `atexit'.

* src/getargs.c (usage): More `fputs', less `fprintf'.

src/complain.h

@@ -0,0 +1,75 @@
+/* Declaration for error-reporting function for Bison.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA.  */
+
+#ifndef COMPLAIN_H_
+#define COMPLAIN_H_ 1
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#if defined (__STDC__) && __STDC__
+
+/* Informative messages, but we proceed. */
+
+extern void warn (const char *format, ...)
+     __attribute__ ((__format__ (__printf__, 1, 2)));
+
+/* Something bad happen, but let's continue and die later. */
+
+extern void complain (const char *format, ...)
+     __attribute__ ((__format__ (__printf__, 1, 2)));
+
+/* Something bad happen and we die now. */
+
+extern void fatal (const char *format, ...)
+     __attribute__ ((__format__ (__printf__, 1, 2)));
+
+/* Print a message with `fprintf (stderr, FORMAT, ...)';
+   if ERRNUM is nonzero, follow it with ": " and strerror (ERRNUM).
+   If STATUS is nonzero, terminate the program with `exit (STATUS)'.  */
+
+extern void error (int status, int errnum,
+		   const char *format, ...)
+     __attribute__ ((__format__ (__printf__, 3, 4)));
+
+#else
+void warn ();
+void complain ();
+void error ();
+#endif
+
+/* Position in the current input file. */
+extern char *infile;
+extern int lineno;
+
+/* This variable is incremented each time `warn' is called.  */
+extern unsigned int warn_message_count;
+
+/* This variable is incremented each time `complain' is called.  */
+extern unsigned int complain_message_count;
+
+/* Sometimes we want to have at most one error per line.  This
+   variable controls whether this mode is selected or not.  */
+extern int error_one_per_line;
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* !COMPLAIN_H_ */