1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright 2017 Jason King.
  27  */
  28 
  29 #include <dlfcn.h>
  30 #include <stdarg.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <demangle.h>
  34 #include <sysdemangle.h>
  35 
  36 #include "dis_util.h"
  37 
  38 int g_error;    /* global process exit status, set when warn() is called */
  39 
  40 /*
  41  * Fatal error.  Print out the error with a leading "dis: ", and then exit the
  42  * program.
  43  */
  44 void
  45 die(const char *fmt, ...)
  46 {
  47         va_list ap;
  48 
  49         (void) fprintf(stderr, "dis: fatal: ");
  50 
  51         va_start(ap, fmt);
  52         (void) vfprintf(stderr, fmt, ap);
  53         va_end(ap);
  54 
  55         (void) fprintf(stderr, "\n");
  56 
  57         exit(1);
  58 }
  59 
  60 /*
  61  * Non-fatal error.  Print out the error with a leading "dis: ", set the global
  62  * error flag, and return.
  63  */
  64 void
  65 warn(const char *fmt, ...)
  66 {
  67         va_list ap;
  68 
  69         (void) fprintf(stderr, "dis: warning: ");
  70 
  71         va_start(ap, fmt);
  72         (void) vfprintf(stderr, fmt, ap);
  73         va_end(ap);
  74 
  75         (void) fprintf(stderr, "\n");
  76 
  77         g_error = 1;
  78 }
  79 
  80 /*
  81  * Convenience wrapper around malloc() to cleanly exit if any allocation fails.
  82  */
  83 void *
  84 safe_malloc(size_t size)
  85 {
  86         void *ret;
  87 
  88         if ((ret = calloc(1, size)) == NULL)
  89                 die("Out of memory");
  90 
  91         return (ret);
  92 }
  93 
  94 
  95 /*
  96  * Since -C flag explicitly says C++, for now at least, force language to
  97  * C++
  98  */
  99 const char *
 100 dis_demangle(const char *name)
 101 {
 102         static char *demangled_name = NULL;
 103 
 104         /*
 105          * Since demangled_name is static, it may be preserved across
 106          * invocations.  As such, make sure any memory that might be present
 107          * from previous invocations is freed.
 108          */
 109         free(demangled_name);
 110         demangled_name = sysdemangle(name, SYSDEM_LANG_CPP, NULL);
 111         return ((demangled_name != NULL) ? demangled_name : name);
 112 }