lib/libc/gen/assert.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)assert.c 8.1 (Berkeley) 6/4/93
  34  * $DragonFly: src/lib/libc/gen/assert.c,v 1.5 2005/04/26 10:41:57 joerg Exp $
  35  */
  36
  37 #include <sys/syslog.h>
  38 #include <assert.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41
  42 void
  43 __assert(const char *file, int line, const char *failedexpr)
  44 {
  45         fprintf(stderr, "assertion \"%s\" failed: file \"%s\", line %d\n",
  46                 failedexpr, file, line);
  47         abort();
  48         /* NOTREACHED */
  49 }
  50
  51 enum {
  52         DIAGASSERT_ABORT =      1<<0,
  53         DIAGASSERT_STDERR =     1<<1,
  54         DIAGASSERT_SYSLOG =     1<<2
  55 };
  56
  57 static int      diagassert_flags = -1;
  58
  59 void
  60 __diagassert(const char *file, int line, const char *function,
  61              const char *failedexpr)
  62 {
  63         char buf[1024];
  64
  65         if (diagassert_flags == -1) {
  66                 const char *p;
  67
  68                 diagassert_flags = DIAGASSERT_SYSLOG | DIAGASSERT_ABORT;
  69
  70                 for (p = getenv("LIBC_DIAGASSERT"); p && *p; p++) {
  71                         switch (*p) {
  72                         case 'a':
  73                                 diagassert_flags |= DIAGASSERT_ABORT;
  74                                 break;
  75                         case 'A':
  76                                 diagassert_flags &= ~DIAGASSERT_ABORT;
  77                                 break;
  78                         case 'e':
  79                                 diagassert_flags |= DIAGASSERT_STDERR;
  80                                 break;
  81                         case 'E':
  82                                 diagassert_flags &= ~DIAGASSERT_STDERR;
  83                                 break;
  84                         case 'l':
  85                                 diagassert_flags |= DIAGASSERT_SYSLOG;
  86                                 break;
  87                         case 'L':
  88                                 diagassert_flags &= ~DIAGASSERT_SYSLOG;
  89                                 break;
  90                         }
  91                 }
  92         }
  93
  94         snprintf(buf, sizeof(buf),
  95                  "assertion \"%s\" failed: file \"%s\", line %d, function \"%s\"",
  96                  failedexpr, file, line, function);
  97         if (diagassert_flags & DIAGASSERT_STDERR)
  98                 fprintf(stderr, "%s: %s\n", getprogname(), buf);
  99         if (diagassert_flags & DIAGASSERT_SYSLOG)
 100                 syslog(LOG_DEBUG | LOG_USER, "%s", buf);
 101         if (diagassert_flags & DIAGASSERT_ABORT)
 102                 abort();
 103 }