Category : C Source Code
Archive   : DMAKE38B.ZIP
Filename : MLC_CHK.C

 
Output of file : MLC_CHK.C contained in archive : DMAKE38B.ZIP
/*
* (c) Copyright 1990 Conor P. Cahill (uunet!virtech!cpcahil).
* You may copy, distribute, and use this software as long as this
* copyright statement is not removed.
*/

#include
#include "malloc.h"
#include "debug.h"

#ifndef lint
static
char rcs_hdr[] = "$Id: mlc_chk.c,v 1.1 1992/01/24 03:29:09 dvadura Exp $";
#endif

extern struct mlist malloc_start;
extern struct mlist * malloc_end;
extern char * malloc_data_start;
extern char * malloc_data_end;

/*
* Function: malloc_in_arena()
*
* Purpose: to verify address is within malloc arena.
*
* Arguments: ptr - pointer to verify
*
* Returns: TRUE - if pointer is within malloc area
* FALSE - otherwise
*
* Narrative:
* IF pointer is >= malloc area start AND <= malloc area end
* return TRUE
* ELSE
* return FALSE
*
* Mod History:
* 90/01/24 cpcahil Initial revision.
*/
int
malloc_in_arena(ptr)
char * ptr;
{
extern char * malloc_data_start;
extern char * malloc_data_end;
int rtn = 0;

if( ptr >= malloc_data_start && ptr <= malloc_data_end )
{
rtn = 1;
}

return(rtn);
}

/*
* Function: malloc_check_str()
*
* Arguments: func - name of function calling this routine
* str - pointer to area to check
*
* Purpose: to verify that if str is within the malloc arena, the data
* it points to does not extend beyond the applicable region.
*
* Returns: Nothing of any use (function is void).
*
* Narrative:
* IF pointer is within malloc arena
* determin length of string
* call malloc_verify() to verify data is withing applicable region
* return
*
* Mod History:
* 90/01/24 cpcahil Initial revision.
* 90/01/29 cpcahil Added code to ignore recursive calls.
*/
void
malloc_check_str(func,str)
char * func;
char * str;
{
static int layers;
register char * s;

if( (layers++ == 0) && malloc_in_arena(str) )
{
for( s=str; *s; s++)
{
}

malloc_verify(func,str,s-str+1);
}

layers--;
}

/*
* Function: malloc_check_strn()
*
* Arguments: func - name of function calling this routine
* str - pointer to area to check
* len - max length of string
*
* Purpose: to verify that if str is within the malloc arena, the data
* it points to does not extend beyond the applicable region.
*
* Returns: Nothing of any use (function is void).
*
* Narrative:
* IF pointer is within malloc arena
* determin length of string
* call malloc_verify() to verify data is withing applicable region
* return
*
* Mod History:
* 90/01/24 cpcahil Initial revision.
* 90/01/29 cpcahil Added code to ignore recursive calls.
* 90/08/29 cpcahil added length (for strn* functions)
*/
void
malloc_check_strn(func,str,len)
char * func;
char * str;
int len;
{
register int i;
static int layers;
register char * s;

if( (layers++ == 0) && malloc_in_arena(str) )
{
for( s=str,i=0; (i < len) && *s; s++)
{
}

malloc_verify(func,str,s-str+1);
}

layers--;
}

/*
* Function: malloc_check_data()
*
* Arguments: func - name of function calling this routine
* ptr - pointer to area to check
* len - length to verify
*
* Purpose: to verify that if ptr is within the malloc arena, the data
* it points to does not extend beyond the applicable region.
*
* Returns: Nothing of any use (function is void).
*
* Narrative:
* IF pointer is within malloc arena
* call malloc_verify() to verify data is withing applicable region
* return
*
* Mod History:
* 90/01/24 cpcahil Initial revision.
* 90/01/29 cpcahil Added code to ignore recursive calls.
*/
void
malloc_check_data(func,ptr,len)
char * func;
char * ptr;
int len;
{
static int layers;

if( layers++ == 0 )
{
DEBUG3(40,"malloc_check_data(%s,0x%x,%d) called...",
func,ptr,len);
if( malloc_in_arena(ptr) )
{
DEBUG0(10,"pointer in malloc arena, verifying...");
malloc_verify(func,ptr,len);
}
}

layers--;
}

/*
* Function: malloc_verify()
*
* Arguments: func - name of function calling the malloc check routines
* ptr - pointer to area to check
* len - length to verify
*
* Purpose: to verify that the data ptr points to does not extend beyond
* the applicable malloc region. This function is only called
* if it has been determined that ptr points into the malloc arena.
*
* Returns: Nothing of any use (function is void).
*
* Narrative:
*
* Mod History:
* 90/01/24 cpcahil Initial revision.
*/
void
malloc_verify(func,ptr,len)
char * func;
char * ptr;
int len;
{
extern struct mlist * malloc_end;
extern int malloc_errno;
extern struct mlist malloc_start;
struct mlist * mptr;

DEBUG3(40,"malloc_verify(%s,0x%x,%d) called...", func,ptr,len);
/*
* Find the malloc block that includes this pointer
*/
mptr = &malloc_start;
while( mptr &&
! (((char *)mptr < ptr) && ((mptr->data+mptr->s.size) > ptr) ) )
{
mptr = mptr->next;
}

/*
* if ptr was not in a malloc block, it must be part of
* some direct sbrk() stuff, so just return.
*/
if( ! mptr )
{
DEBUG1(10,"ptr (0x%x) not found in malloc search", ptr);
return;
}

/*
* Now we have a valid malloc block that contains the indicated
* pointer. We must verify that it is withing the requested block
* size (as opposed to the real block size which is rounded up to
* allow for correct alignment).
*/

DEBUG4(60,"Checking 0x%x-0x%x, 0x%x-0x%x",
ptr, ptr+len, mptr->data, mptr->data+mptr->r_size);

if( (ptr < mptr->data) || ((ptr+len) > (mptr->data+mptr->r_size)) )
{
DEBUG4(0,"pointer not within region 0x%x-0x%x, 0x%x-0x%x",
ptr, ptr+len, mptr->data, mptr->data+mptr->r_size);

malloc_errno = M_CODE_OUTOF_BOUNDS;
malloc_warning(func);
}

return;
}

/*
* $Log: mlc_chk.c,v $
* Revision 1.1 1992/01/24 03:29:09 dvadura
* dmake Version 3.8, Initial revision
*
* Revision 1.5 90/08/29 22:23:48 cpcahil
* added new function to check on strings up to a specified length
* and used it within several strn* functions.
*
* Revision 1.4 90/05/11 00:13:09 cpcahil
* added copyright statment
*
* Revision 1.3 90/02/24 21:50:22 cpcahil
* lots of lint fixes
*
* Revision 1.2 90/02/24 17:29:38 cpcahil
* changed $Header to $Id so full path wouldnt be included as part of rcs
* id string
*
* Revision 1.1 90/02/24 14:57:03 cpcahil
* Initial revision
*
*/


  3 Responses to “Category : C Source Code
Archive   : DMAKE38B.ZIP
Filename : MLC_CHK.C

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