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