/*	$NetBSD: msg.c,v 1.26 2024/11/30 18:17:12 rillig Exp $	*/

/*
 * Copyright (c) 1994, 1995 Jochen Pohl
 * All Rights Reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Jochen Pohl for
 *	The NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if defined(__RCSID)
__RCSID("$NetBSD: msg.c,v 1.26 2024/11/30 18:17:12 rillig Exp $");
#endif

#include <stdarg.h>
#include <stdio.h>
#include <string.h>

#include "lint2.h"

static const char *msgs[] = {
	"%s is used in %s but never defined",				// 0
	"%s is defined in %s but never used",				// 1
	"%s is declared in %s but never used or defined",		// 2
	"%s has multiple definitions in %s and %s",			// 3
	"%s has its return value used inconsistently by %s and %s",	// 4
	"%s returns '%s' at %s, versus '%s' at %s",			// 5
	"%s has argument %d with type '%s' at %s, versus '%s' at %s",	// 6
	"%s has %d parameters in %s, versus %d arguments in %s",	// 7
	"%s returns a value that is always ignored",			// 8
	"%s returns a value that is sometimes ignored",			// 9
	"%s has its return value used in %s but doesn't return one",	// 10
	"%s has parameter %d declared as '%s' in %s, versus '%s' in %s", // 11
	"%s has %d parameters in %s, versus %d in %s",			// 12
	"%s is called with a malformed format string in %s",		// 13
	"%s is called in %s with argument %d being incompatible with format string", // 14
	"%s is called in %s with too few arguments for format string",	// 15
	"%s is called in %s with too many arguments for format string",	// 16
	"%s's return type in %s must be declared before use in %s",	// 17
	"%s is renamed multiple times in %s and %s",			// 18
};

void
msg(int n, ...)
{
	va_list ap;

	va_start(ap, n);

	(void)vprintf(msgs[n], ap);
	(void)printf(" [lint2:%03d]\n", n);

	va_end(ap);
}

/*
 * Return a pointer to the last component of a path.
 */
static const char *
lbasename(const char *path)
{

	if (Fflag)
		return path;

	const char *base = path;
	for (const char *p = path; *p != '\0'; p++)
		if (*p == '/')
			base = p + 1;
	return base;
}

/*
 * Create a string which describes a position in a source file.
 */
const char *
mkpos(const pos_t *posp)
{
	static struct buffer {
		char *buf;
		size_t cap;
	} buffers[2];
	static unsigned int buf_index;

	struct buffer *buf = buffers + buf_index;
	buf_index ^= 1;

	int filename;
	int lineno;
	if (Hflag && posp->p_src != posp->p_isrc) {
		filename = posp->p_isrc;
		lineno = posp->p_iline;
	} else {
		filename = posp->p_src;
		lineno = posp->p_line;
	}

	bool qm = !Hflag && posp->p_src != posp->p_isrc;
	const char *fn = lbasename(fnames[filename]);
	size_t len = strlen(fn) + 1 + 1 + 3 * sizeof(int) + 1 + 1;

	if (len > buf->cap)
		buf->buf = xrealloc(buf->buf, buf->cap = len);
	if (lineno != 0)
		(void)snprintf(buf->buf, buf->cap, "%s%s(%d)",
		    fn, qm ? "?" : "", lineno);
	else
		(void)snprintf(buf->buf, buf->cap, "%s", fn);

	return buf->buf;
}