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      1 /*	$NetBSD: msg.c,v 1.27 2025/05/24 07:00:32 rillig Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994, 1995 Jochen Pohl
      5  * All Rights Reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Jochen Pohl for
     18  *	The NetBSD Project.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #if HAVE_NBTOOL_CONFIG_H
     35 #include "nbtool_config.h"
     36 #endif
     37 
     38 #include <sys/cdefs.h>
     39 #if defined(__RCSID)
     40 __RCSID("$NetBSD: msg.c,v 1.27 2025/05/24 07:00:32 rillig Exp $");
     41 #endif
     42 
     43 #include <stdarg.h>
     44 #include <stdio.h>
     45 #include <string.h>
     46 
     47 #include "lint2.h"
     48 
     49 static const char *msgs[] = {
     50 	"%s is used in %s but never defined",				// 0
     51 	"%s is defined in %s but never used",				// 1
     52 	"%s is declared in %s but never used or defined",		// 2
     53 	"%s has multiple definitions in %s and %s",			// 3
     54 	"%s has its return value used inconsistently by %s and %s",	// 4
     55 	"%s %s '%s' at %s, versus '%s' at %s",				// 5
     56 	"%s has argument %d with type '%s' at %s, versus '%s' at %s",	// 6
     57 	"%s has %d parameters in %s, versus %d arguments in %s",	// 7
     58 	"%s returns a value that is always ignored",			// 8
     59 	"%s returns a value that is sometimes ignored",			// 9
     60 	"%s has its return value used in %s but doesn't return one",	// 10
     61 	"%s has parameter %d declared as '%s' in %s, versus '%s' in %s", // 11
     62 	"%s has %d parameters in %s, versus %d in %s",			// 12
     63 	"%s is called with a malformed format string in %s",		// 13
     64 	"%s is called in %s with argument %d being incompatible with format string", // 14
     65 	"%s is called in %s with too few arguments for format string",	// 15
     66 	"%s is called in %s with too many arguments for format string",	// 16
     67 	"%s's return type in %s must be declared before use in %s",	// 17
     68 	"%s is renamed multiple times in %s and %s",			// 18
     69 };
     70 
     71 void
     72 msg(int n, ...)
     73 {
     74 	va_list ap;
     75 
     76 	va_start(ap, n);
     77 
     78 	(void)vprintf(msgs[n], ap);
     79 	(void)printf(" [lint2:%03d]\n", n);
     80 
     81 	va_end(ap);
     82 }
     83 
     84 /*
     85  * Return a pointer to the last component of a path.
     86  */
     87 static const char *
     88 lbasename(const char *path)
     89 {
     90 
     91 	if (Fflag)
     92 		return path;
     93 
     94 	const char *base = path;
     95 	for (const char *p = path; *p != '\0'; p++)
     96 		if (*p == '/')
     97 			base = p + 1;
     98 	return base;
     99 }
    100 
    101 /*
    102  * Create a string which describes a position in a source file.
    103  */
    104 const char *
    105 mkpos(const pos_t *posp)
    106 {
    107 	static struct buffer {
    108 		char *buf;
    109 		size_t cap;
    110 	} buffers[2];
    111 	static unsigned int buf_index;
    112 
    113 	struct buffer *buf = buffers + buf_index;
    114 	buf_index ^= 1;
    115 
    116 	int filename;
    117 	int lineno;
    118 	if (Hflag && posp->p_src != posp->p_isrc) {
    119 		filename = posp->p_isrc;
    120 		lineno = posp->p_iline;
    121 	} else {
    122 		filename = posp->p_src;
    123 		lineno = posp->p_line;
    124 	}
    125 
    126 	bool qm = !Hflag && posp->p_src != posp->p_isrc;
    127 	const char *fn = lbasename(fnames[filename]);
    128 	size_t len = strlen(fn) + 1 + 1 + 3 * sizeof(int) + 1 + 1;
    129 
    130 	if (len > buf->cap)
    131 		buf->buf = xrealloc(buf->buf, buf->cap = len);
    132 	if (lineno != 0)
    133 		(void)snprintf(buf->buf, buf->cap, "%s%s(%d)",
    134 		    fn, qm ? "?" : "", lineno);
    135 	else
    136 		(void)snprintf(buf->buf, buf->cap, "%s", fn);
    137 
    138 	return buf->buf;
    139 }
    140