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      1 /*	$NetBSD: assert.c,v 1.18 2017/05/15 16:09:09 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)assert.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: assert.c,v 1.18 2017/05/15 16:09:09 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <sys/types.h>
     43 
     44 #include <assert.h>
     45 #include <stdio.h>
     46 #include <stdlib.h>
     47 #include <unistd.h>
     48 #include <syslog.h>
     49 #include "extern.h"
     50 
     51 static int
     52 fmtassert(char *buf, size_t len, const char *file, int line,
     53     const char *function, const char *failedexpr)
     54 {
     55 	return snprintf_ss(buf, len,
     56 	    "assertion \"%s\" failed: file \"%s\", line %d%s%s%s\n",
     57 	    failedexpr, file, line,
     58 	    function ? ", function \"" : "",
     59 	    function ? function : "",
     60 	    function ? "\"" : "");
     61 }
     62 
     63 void
     64 __assert13(const char *file, int line, const char *function,
     65     const char *failedexpr)
     66 {
     67 	char buf[1024];
     68 	int l = fmtassert(buf, sizeof(buf), file, line, function, failedexpr);
     69 	if (l < 0)
     70 		abort();
     71 	(void)write(STDERR_FILENO, buf, (size_t)l);
     72 	abort();
     73 	/* NOTREACHED */
     74 }
     75 
     76 void
     77 __assert(const char *file, int line, const char *failedexpr)
     78 {
     79 
     80 	__assert13(file, line, NULL, failedexpr);
     81 	/* NOTREACHED */
     82 }
     83 
     84 
     85 enum {
     86 	DIAGASSERT_ABORT =	1<<0,
     87 	DIAGASSERT_STDERR =	1<<1,
     88 	DIAGASSERT_SYSLOG =	1<<2
     89 };
     90 
     91 static int	diagassert_flags = -1;
     92 
     93 void
     94 __diagassert13(const char *file, int line, const char *function,
     95     const char *failedexpr)
     96 {
     97 	char buf[1024];
     98 
     99 	if (diagassert_flags == -1) {
    100 		char *p;
    101 
    102 		diagassert_flags = DIAGASSERT_SYSLOG;
    103 
    104 		for (p = getenv("LIBC_DIAGASSERT"); p && *p; p++) {
    105 			switch (*p) {
    106 			case 'a':
    107 				diagassert_flags |= DIAGASSERT_ABORT;
    108 				break;
    109 			case 'A':
    110 				diagassert_flags &= ~DIAGASSERT_ABORT;
    111 				break;
    112 			case 'e':
    113 				diagassert_flags |= DIAGASSERT_STDERR;
    114 				break;
    115 			case 'E':
    116 				diagassert_flags &= ~DIAGASSERT_STDERR;
    117 				break;
    118 			case 'l':
    119 				diagassert_flags |= DIAGASSERT_SYSLOG;
    120 				break;
    121 			case 'L':
    122 				diagassert_flags &= ~DIAGASSERT_SYSLOG;
    123 				break;
    124 			}
    125 		}
    126 	}
    127 
    128 	fmtassert(buf, sizeof(buf), file, line, function, failedexpr);
    129 	if (diagassert_flags & DIAGASSERT_STDERR) {
    130 		char ebuf[1024];
    131 		int l = snprintf_ss(ebuf, sizeof(ebuf), "%s: %s\n",
    132 		    getprogname(), buf);
    133 		if (l == -1)
    134 			abort();
    135 		(void)write(STDERR_FILENO, ebuf, (size_t)l);
    136 	}
    137 	if (diagassert_flags & DIAGASSERT_SYSLOG) {
    138 		struct syslog_data sdata = SYSLOG_DATA_INIT;
    139 		syslog_ss(LOG_DEBUG | LOG_USER, &sdata, "%s", buf);
    140 	}
    141 	if (diagassert_flags & DIAGASSERT_ABORT)
    142 		abort();
    143 }
    144 
    145 void
    146 __diagassert(const char *file, int line, const char *failedexpr)
    147 {
    148 
    149 	__diagassert13(file, line, NULL, failedexpr);
    150 }
    151