Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!wuarchive!uunet!bcstec!misty!b-mrda!miller
From: miller@b-mrda.ca.boeing.com (Mark Miller)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Borland Turbo C 1.5
Message-ID: <24200009@b-mrda.ca.boeing.com>
Date: 4 Jan 91 16:36:11 GMT
References: <1991Jan3.125057.21477@cbnewsm.att.com>
Organization: Boeing Commercial Airplanes MR&D
Lines: 38

Sounds like a wild pointer. Look for one of the following instances:

/* problem 1 */

char *p1;
char *p2 = "Hello there";

strcpy(p2, p1); /* No memory allocated for p1 - overwrites other stuff */

/* problem 2 */

int array[10];

array[12] = 100; /* Writing past end of array */

/* problem 3 */

char array[4];

strcpy (array, "Four");  /* Trailing zero of string runs past end of array */

These and other such instances are tough to find. I have used the heapwalk()
and heapcheck() functions to help in troubleshooting and to isolate the
troublesome module. Also, check to see that all memory that you dynamically
allocate (with malloc, calloc, etc.) is PROPERLY freed. That is, if you 
use farmalloc(), then you must use farfree() to free the allocated memory.
Good luck.


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Mark R. Miller                     | 
Boeing Commercial Airplane Company | 
Seattle, WA                        | 
Internet: miller@b-mrda.boeing.com | 
Voicenet: (206) 237-0960           |  
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Opinions expressed here do not necessarily reflect those of my employer.
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