Assertion Failure

This is a discussion on Assertion Failure within the C Programming forums, part of the General Programming Boards category; I'm using Microsoft Visual Studio 2005 for Windows XP. I have my program compiling, but when I run it I ...

  1. #1
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    Assertion Failure

    I'm using Microsoft Visual Studio 2005 for Windows XP.

    I have my program compiling, but when I run it I get 2 errors from the
    Microsoft Visual C++ Dbug Library in the microsoft file isctype.c. Both errors are the same - Expression: (unsigned)(c + 1) <= 256. The errors occur on the following lines where _ASSERTE occurs in isctype.c:

    Code:
    #if defined (_DEBUG)
    extern "C" int __cdecl _chvalidator(
            int c,
            int mask
            )
    {
            _ASSERTE((unsigned)(c + 1) <= 256);
            return _chvalidator_l(NULL, c, mask);
    }
    
    extern "C" int __cdecl _chvalidator_l(
            _locale_t plocinfo,
            int c,
            int mask
            )
    {
        _LocaleUpdate _loc_update(plocinfo);
    
        _ASSERTE((unsigned)(c + 1) <= 256);
        if (c >= -1 && c <= 255)
        {
            return (_loc_update.GetLocaleT()->locinfo->pctype[c] & mask);
        }
        else
        {
            return (_loc_update.GetLocaleT()->locinfo->pctype[-1] & mask);
        }
    }

  2. #2
    Code Goddess Prelude's Avatar
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    Please post the code you wrote that causes this error.
    My best code is written with the delete key.

  3. #3
    and the hat of wrongness Salem's Avatar
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    My guess is you did some ctype test on EOF.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  4. #4
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    Thanks for getting back to me. Here is the code that's causing the error:
    Code:
    #include <stdio.h>
    #include <conio.h>
    #include "molecule.h"
    #include "smiles.h"
    #include "smierr.h"
    
    main( int argc, char *argv[] )
    {
       char buf[200];
       char s[MAX_SMI];
       char sf[MAX_SMI];
       int Error, ErCode;
       int N_Frag, Found;
       MOLECULE m;
       RINGS r;
       long id;
       FILE *ff, *fs, *fo;
    
       if ( argc != 4 ) {
          printf( "USAGE: fragment <smiles-file> <fragment-file> <output-file>\n" );     
    	  exit( 1 );
       }
       
       if ( (fs = fopen( argv[1], "r" )) == NULL ) {
          printf( "Unable to open SMILES file %s\n", argv[1] );
          exit( 1 );
       }
       if ( (ff = fopen( argv[2], "r" )) == NULL ) {
          printf( "Unable to open FRAGMENT file %s\n", argv[2] );
          exit( 1 );
       }
       if ( (fo = fopen( argv[3], "w" )) == NULL ) {
          printf( "Unable to open OUTPUT file %s\n", argv[3] );
          exit( 1 );
       }
    
       printf( " Processed: " );
       fgets( buf, 200, fs );      /* Retrieve line from smiles file */
       
       sscanf( buf, "%ld %s", &id, s);
       while ( !feof( fs ) ) {     
    	   if ( (Error = InSmi( s, &m, &ErCode, 0 )) != 0 ) {
             printf( "SMILES ERROR for %ld", id );
             getch();
          } else if ( (Error = ChkVal( &m )) != 0 ) {
             printf("VALENCE ERROR for %ld", id );
             getch();
          } else {
    	 FindRings(&m,&r);
             Found = 0;
             fscanf( ff, "%s", sf );
             while ( (!feof( ff )) && !Found ) {
    	    N_Frag = EV_Num( sf, &m, &r );
                if ( N_Frag > 0 ) {
                   fprintf( fo, "%10ld|%s\n", id, s );
                   Found = 1;
                } else if ( N_Frag < 0 ) {
                   printf( "FRAGMENT ERROR\n" );
                   exit( 1 );
                }
                fscanf( ff, "%s", sf );
             }
             rewind( ff );
          }
          printf( "Processing %7ld\n", id );
          fgets( buf, 200, fs );      /* Retrieve line from smiles file */
          sscanf( buf, "%ld %s", &id, s);
    
       }
       fclose( fs );
       fclose( ff );
       fclose( fo );
      
       exit( 0 );
    }

  5. #5
    and the hat of wrongness Salem's Avatar
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    But that's not all the code.

    1. Compile it all with debug.
    2. Run the code in the debugger.
    3. When you get an assert, drop into the debugger and get a stack trace.
    4. Follow the stack backwards until you get into your code.
    5. Explore around there to work out why you're passing an out of range value.

    Also, read the FAQ on why feof() is bad in control loops.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
    Registered User
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    Thanks Salem, that gets me going in the right direction.

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