xref: /netbsd-src/lib/libc/gen/assert.c (revision eeb345227e5a1360bcc1632e7e38812ab0c8ca55)
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
fmtassert(char * buf,size_t len,const char * file,int line,const char * function,const char * failedexpr)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
__assert13(const char * file,int line,const char * function,const char * failedexpr)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
__assert(const char * file,int line,const char * failedexpr)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
__diagassert13(const char * file,int line,const char * function,const char * failedexpr)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
__diagassert(const char * file,int line,const char * failedexpr)146 __diagassert(const char *file, int line, const char *failedexpr)
147 {
148 
149 	__diagassert13(file, line, NULL, failedexpr);
150 }
151