typedef struct TMainS
  {
    unsigned char   Start;
    unsigned long   Adata;
    unsigned int      Bdata;
    unsigned char   Cdata[var];
    unsigned int      Ddata;
    unsigned int      Edata;

  } T_MainS_Header;

/* - LIMITS.H -

Integral ANSI element sizes.

$Revision: 1.4 $

Copyright 1986 - 1999 IAR Systems. All rights reserved.
*/

#ifndef _LIMITS_INCLUDED
#define _LIMITS_INCLUDED

#ifndef _SYSTEM_BUILD
#pragma system_include
#endif

#include "sysmac.h"

#define CHAR_BIT 8 /* Number of bits in any "char" */

#if defined(__CHAR_MAX__)

#define CHAR_MAX __CHAR_MAX__
#define CHAR_MIN __CHAR_MIN__

#define MB_LEN_MAX 1 /* No of bytes in multibyte char */

#define SCHAR_MAX __SIGNED_CHAR_MAX__
#define SCHAR_MIN __SIGNED_CHAR_MIN__
#define UCHAR_MAX __UNSIGNED_CHAR_MAX__

#define SHRT_MAX __SIGNED_SHORT_MAX__
#define SHRT_MIN __SIGNED_SHORT_MIN__
#define USHRT_MAX __UNSIGNED_SHORT_MAX__

#define INT_MAX __SIGNED_INT_MAX__
#define INT_MIN __SIGNED_INT_MIN__
#define UINT_MAX __UNSIGNED_INT_MAX__

#define LONG_MAX __SIGNED_LONG_MAX__
#define LONG_MIN __SIGNED_LONG_MIN__
#define ULONG_MAX __UNSIGNED_LONG_MAX__

#else /* !defined(__CHAR_MAX__) */

#if _argt$(char)==1 /* "char" = "unsigned" "char" */
#define CHAR_MAX 255
#define CHAR_MIN 0
#else
#define CHAR_MAX 127 /* Maximum "char" value */
#define CHAR_MIN (-128) /* Mimimum "char" value */
#endif

#define MB_LEN_MAX 1 /* No of bytes in multibyte char */

#define SCHAR_MAX 127 /* Maximum "signed" "char" value */
#define SCHAR_MIN (-128) /* Minimum "signed" "char" value */

#define UCHAR_MAX 255 /* Maximum "unsigned" "char" value */

#define SHRT_MAX 32767 /* Maximum ("signed") "short" value */
#define SHRT_MIN (-32767-1) /* Minimum ("signed") "short" value */
#define USHRT_MAX 0xFFFFU /* Maximum "unsigned" "short" value */

#if __INT_SIZE__ == 2 /* For 32-bit CPU's usually not */
#define INT_MAX 32767 /* Maximum ("signed") "int" value */
#define INT_MIN (-32767-1) /* Minimum ("signed") "int" value */
#define UINT_MAX 0xFFFFU /* Maximum "unsigned" "int" value */
#else
#define INT_MAX 2147483647
#define INT_MIN (-2147483647-1)
#define UINT_MAX 0xFFFFFFFFU
#endif

#define LONG_MAX 2147483647 /* Maximum ("signed") "long" value */
#define LONG_MIN (-2147483647-1) /* Minimum ("signed") "long" value */
#define ULONG_MAX 0xFFFFFFFFU /* Maximum "unsigned" "long" value */

#endif /* defined(__CHAR_MAX__) */

#endif

    char* p = (char*)123;
    p[0] = '/0';
    p[-1] = 'а';
    p[-2] = 'п';
    p[-3] = 'о';
    p[-4] = 'Ж';

char* p = (char*)-1;
for (int i=0; i<10; i++)  *++p = 0;

...
#include <string.h>
...
#define BUFFER_SIZE_P 350
unsigned char buf_phone[BUFFER_SIZE_P];
..
void test (void)
{
  unsigned char *p1, *p2, *p3;

  p1 = & test1[0];
  p2 = & test2[0];
  p3 = strstr( test2, test1);
}  
...

p3 = (unsigned char*)strstr( (char const*)test2, (char const*)test1);

unsigned char test1[] = "hello";
unsigned char test2[] = "test1 hello test2";


void test (void)
{
  char *p1, *p2, *p3;

  p1 = (char*) & test1[0];
  p2 = (char*) & test2[0];
  p3 = strstr( p2, p1);
}

char test1[] = "hello";
char test2[] = "test1 hello test2";

char*  p = strstr(test2, test1);
...

char test1[] = "hello";
char test2[] = "test1 hello test2";
  p3 = strstr( test1, test2);

char *test1 = "hello";
char *test2 = "test1 hello test2";

__flash  char *test_   = "hello";
__flash  char *test_1 = "test1 hello test2";

void test (void)
{
  char *p1, *p2, *p3;

  p3 = strstr( test_1, test_);
}

__flash  char *test_   = "hello";
char test_1[350] = "test1 hello test2";

void test (void)
{
  char  *p3;

  p3 = strstr( test_1, test_);
}

__flash  char *test_   = "hello";
char test_1[350] = "test1 hello test2";

void test (void)
{
  char  *p3;

  p3 = strstr( test_1, test_);
}