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annotate I/O errors with the corresponding message
(a full switch to err(3) would involve significant message changes)

okay millert@

/*		$OpenBSD: error.c,v 1.17 2020/05/24 18:27:07 espie Exp $		*/
/*		$NetBSD: error.c,v 1.4 1996/03/19 03:21:32 jtc Exp $		*/

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Paul Corbett.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/* routines for printing error messages  */

#include "defs.h"
#include <errno.h>


void
fatal(char *msg)
{
	fprintf(stderr, "%s: %s\n", input_file_name, msg);
	exit(2);
}


void
no_space(void)
{
	fprintf(stderr, "%s: yacc is out of space\n", input_file_name);
	exit(2);
}


void
open_error(char *filename)
{
	fprintf(stderr, "%s: cannot open source file %s: %s\n",
	    input_file_name, filename, strerror(errno));
	exit(2);
}

void
tempfile_error(void)
{
	fprintf(stderr, "%s: cannot create temporary file: %s\n",
	    input_file_name, strerror(errno));
	exit(2);
}

void
open_write_error(char *filename)
{
	fprintf(stderr, "%s: cannot open target file %s for writing: %s\n",
	    input_file_name, filename, strerror(errno));
	exit(2);
}

void
unexpected_EOF(void)
{
	fprintf(stderr, "%s:%d: unexpected end-of-file\n",
	    input_file_name, lineno);
	exit(1);
}


void
print_pos(char *st_line, char *st_cptr)
{
	char *s;

	if (st_line == 0)
		return;
	for (s = st_line; *s != '\n'; ++s) {
		if (isprint((unsigned char)*s) || *s == '\t')
			putc(*s, stderr);
		else
			putc('?', stderr);
	}
	putc('\n', stderr);
	for (s = st_line; s < st_cptr; ++s) {
		if (*s == '\t')
			putc('\t', stderr);
		else
			putc(' ', stderr);
	}
	putc('^', stderr);
	putc('\n', stderr);
}

void
syntax_error(int st_lineno, char *st_line, char *st_cptr)
{
	fprintf(stderr, "%s:%d: syntax error\n",
	    input_file_name, st_lineno);
	print_pos(st_line, st_cptr);
	exit(1);
}

void
unterminated_comment(int c_lineno, char *c_line, char *c_cptr)
{
	fprintf(stderr, "%s:%d: unmatched /*\n",
	    input_file_name, c_lineno);
	print_pos(c_line, c_cptr);
	exit(1);
}

void
unterminated_string(int s_lineno, char *s_line, char *s_cptr)
{
	fprintf(stderr, "%s:%d:, unterminated string\n",
	    input_file_name, s_lineno);
	print_pos(s_line, s_cptr);
	exit(1);
}

void
unterminated_text(int t_lineno, char *t_line, char *t_cptr)
{
	fprintf(stderr, "%s:%d: unmatched %%{\n",
	    input_file_name, t_lineno);
	print_pos(t_line, t_cptr);
	exit(1);
}

void
unterminated_union(int u_lineno, char *u_line, char *u_cptr)
{
	fprintf(stderr, "%s:%d: unterminated %%union declaration\n",
	    input_file_name, u_lineno);
	print_pos(u_line, u_cptr);
	exit(1);
}

void
over_unionized(char *u_cptr)
{
	fprintf(stderr, "%s:%d: too many %%union declarations\n",
	    input_file_name, lineno);
	print_pos(line, u_cptr);
	exit(1);
}

void
illegal_tag(int t_lineno, char *t_line, char *t_cptr)
{
	fprintf(stderr, "%s:%d: illegal tag\n",
	    input_file_name, t_lineno);
	print_pos(t_line, t_cptr);
	exit(1);
}


void
illegal_character(char *c_cptr)
{
	fprintf(stderr, "%s:%d: illegal character\n",
	    input_file_name, lineno);
	print_pos(line, c_cptr);
	exit(1);
}


void
used_reserved(char *s)
{
	fprintf(stderr, "%s:%d: illegal use of reserved symbol %s\n",
	    input_file_name, lineno, s);
	exit(1);
}

void
tokenized_start(char *s)
{
	fprintf(stderr, "%s:%d: the start symbol %s cannot be declared to be a token\n",
	    input_file_name, lineno, s);
	exit(1);
}

void
retyped_warning(char *s)
{
	fprintf(stderr, "%s:%d: the type of %s has been redeclared\n",
	    input_file_name, lineno, s);
}

void
reprec_warning(char *s)
{
	fprintf(stderr, "%s:%d: the precedence of %s has been redeclared\n",
	    input_file_name, lineno, s);
}

void
revalued_warning(char *s)
{
	fprintf(stderr, "%s:%d: the value of %s has been redeclared\n",
	    input_file_name, lineno, s);
}

void
terminal_start(char *s)
{
	fprintf(stderr, "%s:%d: the start symbol %s is a token\n",
	    input_file_name, lineno, s);
	exit(1);
}

void
restarted_warning(void)
{
	fprintf(stderr, "%s:%d: the start symbol has been redeclared\n",
	     input_file_name, lineno);
}

void
no_grammar(void)
{
	fprintf(stderr, "%s:%d: no grammar has been specified\n",
	    input_file_name, lineno);
	exit(1);
}

void
terminal_lhs(int s_lineno)
{
	fprintf(stderr, "%s:%d: a token appears on the lhs of a production\n",
	    input_file_name, s_lineno);
	exit(1);
}

void
prec_redeclared(void)
{
	fprintf(stderr, "%s:%d: conflicting %%prec specifiers\n",
	    input_file_name, lineno);
}

void
unterminated_action(int a_lineno, char *a_line, char *a_cptr)
{
	fprintf(stderr, "%s:%d: unterminated action\n",
	    input_file_name, a_lineno);
	print_pos(a_line, a_cptr);
	exit(1);
}

void
dollar_warning(int a_lineno, int i)
{
	fprintf(stderr, "%s:%d: $%d references beyond the end of the current rule\n",
	    input_file_name, a_lineno, i);
}

void
dollar_error(int a_lineno, char *a_line, char *a_cptr)
{
	fprintf(stderr, "%s:%d: illegal $-name\n",
	    input_file_name, a_lineno);
	print_pos(a_line, a_cptr);
	exit(1);
}


void
untyped_lhs(void)
{
	fprintf(stderr, "%s:%d: $$ is untyped\n",
	    input_file_name, lineno);
	exit(1);
}

void
untyped_rhs(int i, char *s)
{
	fprintf(stderr, "%s:%d: $%d (%s) is untyped\n",
	    input_file_name, lineno, i, s);
	exit(1);
}

void
unknown_rhs(int i)
{
	fprintf(stderr, "%s:%d: $%d is untyped\n",
	    input_file_name, lineno, i);
	exit(1);
}

void
default_action_warning(void)
{
	fprintf(stderr, "%s:%d: the default action assigns an undefined value to $$\n",
	    input_file_name, lineno);
}

void
undefined_goal(char *s)
{
	fprintf(stderr, "%s: the start symbol %s is undefined\n", input_file_name, s);
	exit(1);
}

void
undefined_symbol_warning(char *s)
{
	fprintf(stderr, "%s: the symbol %s is undefined\n", input_file_name, s);
}