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Re: Program crashes when executed normally, but runs w/o trouble in the Debugger
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Re: Program crashes when executed normally, but runs w/o trouble in the Debugger


  • Subject: Re: Program crashes when executed normally, but runs w/o trouble in the Debugger
  • From: Cameron Kerr <email@hidden>
  • Date: Fri, 1 Jul 2005 11:24:28 +1200

On 1/07/2005, at 11:01 AM, Lorance, Ted wrote:

It would be advisable to create these on the heap, rather than on the stack (ie, using malloc() and free()). There is only so much space on the stack, although 80 bytes should still fit fine.

    char temp[20];
    char localBuffer[60];


Here you should use getwd() instead of getenv, as PWD will not always be set. It may well be why you are crashing, as you're not testing for errors!

buffer = getenv ("PWD");


When printing debugging statements, always print to stderr, as stderr is unbuffered, and will be printed immediately. So use fprintf ( stderr, ...)

If you don't, you can get a wrong impression of where a program is crashing, if you go by the printf output.

    strcat(buffer,"/\0");
    printf("%s\n",buffer);
    strcat(buffer,localBuffer);
    printf("%s\n",buffer);


Here you're assuming. You should use x-man-page://perror

    in_file = fopen(buffer,"rt");
    if (in_file==NULL)
    {


You should use s (temp is 20 characters, so that's 19 characters and the terminating nil) here, and fnscanf, otherwise you can overflow the buffer, and crash.

fscanf (in_file, "%s", &temp);

-- Cameron Kerr Telecommunications Teaching Fellow & SysAdmin email@hidden

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References: 
 >Program crashes when executed normally, but runs w/o trouble in the Debugger (From: "Lorance, Ted" <email@hidden>)

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