//

 //  ExceptionUtils.m

 //  MYUtilities

 //

 //  Created by Jens Alfke on 1/5/08.

 //  Copyright 2008 Jens Alfke. All rights reserved.

 //  See BSD license at bottom of file.

 //

 #import "ExceptionUtils.h"

 #import <unistd.h>

 #ifndef Warn

 #define Warn NSLog

 #endif

 static void (*sExceptionReporter)(NSException*);

 void MYSetExceptionReporter( void (*reporter)(NSException*) )

 {

     sExceptionReporter = reporter;

 }

 void MYReportException( NSException *x, NSString *where, ... )

 {

     va_list args;

     va_start(args,where);

     where = [[NSString alloc] initWithFormat: where arguments: args];

     va_end(args);

     if( sExceptionReporter ) {

         Warn(@"Exception caught in %@:\n\t%@",where,x);

         sExceptionReporter(x);

     }else

         Warn(@"Exception caught in %@:\n\t%@\n%@",where,x,x.my_callStack);

     [where release];

 }

 @implementation NSException (MooseyardUtil)

 - (NSArray*) my_callStackReturnAddresses

 {

     // On 10.5 or later, can get the backtrace:

     if( [self respondsToSelector: @selector(callStackReturnAddresses)] )

         return [self valueForKey: @"callStackReturnAddresses"];

     else

         return nil;

 }

 - (NSArray*) my_callStackReturnAddressesSkipping: (unsigned)skip limit: (unsigned)limit

 {

     NSArray *addresses = [self my_callStackReturnAddresses];

     if( addresses ) {

         unsigned n = [addresses count];

         skip = MIN(skip,n);

         limit = MIN(limit,n-skip);

         addresses = [addresses subarrayWithRange: NSMakeRange(skip,limit)];

     }

     return addresses;

 }

 - (NSString*) my_callStack

 {

     NSArray *addresses = [self my_callStackReturnAddressesSkipping: 2 limit: 15];

     if (!addresses)

         return nil;

     // We pipe the hex return addresses through the 'atos' tool to get symbolic names:

     // Adapted from <http://paste.lisp.org/display/47196>:

     NSMutableString *cmd = [NSMutableString stringWithFormat: @"/usr/bin/atos -p %d", getpid()];

     NSValue *addr;

     foreach(addr,addresses) {

         [cmd appendFormat: @" %p", [addr pointerValue]];

     }

     FILE *file = popen( [cmd UTF8String], "r" );

     if( ! file )

         return nil;

     NSMutableData *output = [NSMutableData data];

     char buffer[512];

     size_t length;

     while ((length = fread( buffer, 1, sizeof( buffer ), file ) ))

         [output appendBytes: buffer length: length];

     pclose( file );

     NSString *outStr = [[[NSString alloc] initWithData: output encoding: NSUTF8StringEncoding] autorelease];

     NSMutableString *result = [NSMutableString string];

     NSString *line;

     foreach( line, [outStr componentsSeparatedByString: @"\n"] ) {

         // Skip  frames that are part of the exception/assertion handling itself:

         if( [line hasPrefix: @"-[NSAssertionHandler"] || [line hasPrefix: @"+[NSException"] 

                 || [line hasPrefix: @"-[NSException"] || [line hasPrefix: @"_AssertFailed"] )

             continue;

         if( result.length )

             [result appendString: @"\n"];

         [result appendString: @"\t"];

         [result appendString: line];

         // Don't show the "__start" frame below "main":

         if( [line hasPrefix: @"main "] )

             break;

     }

     return result;

 }

 @end

 @implementation MYExceptionReportingApplication

 static void report( NSException *x ) {

     [NSApp reportException: x];

 }

 - (id) init

 {

     self = [super init];

     if (self != nil) {

         MYSetExceptionReporter(&report);

     }

     return self;

 }

 - (void)reportException:(NSException *)x

 {

     [super reportException: x];

     [self performSelector: @selector(_showExceptionAlert:) withObject: x afterDelay: 0.0];

     MYSetExceptionReporter(NULL);     // ignore further exceptions till alert is dismissed

 }

 - (void) _showExceptionAlert: (NSException*)x

 {

     NSString *stack = [x my_callStack] ?:@"";

     int r = NSRunCriticalAlertPanel( @"Cloudy Internal Error!",

                             [NSString stringWithFormat: @"Uncaught exception: %@\n%@\n\n%@\n\n"

                              "Please report this bug to jens@mooseyard.com (you can copy & paste the text).",

                              [x name], [x reason], stack],

                             @"Sorry",@"Quit",nil);

     if( r == NSAlertAlternateReturn )

         exit(1);

     MYSetExceptionReporter(&report);

 }

 @end

 /*

  Copyright (c) 2008, Jens Alfke. All rights reserved.

  Redistribution and use in source and binary forms, with or without modification, are permitted

  provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this list of conditions

  and the following disclaimer.

  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions

  and the following disclaimer in the documentation and/or other materials provided with the

  distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR

  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 

  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-

  BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 

   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 

  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 

  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  */