Q46206: Internal Compiler Error: ctypes.c Line 474

Article: Q46206
Product(s): See article
Version(s): 5.10   | 5.10
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | | mspl13_c
Last Modified: 18-SEP-1989

The program below, when compiled with /Oi, will generate the following
error:

   program.c(27) : fatal error C1001: Internal Compiler Error
                   (compiler file '@(#)ctypes,c:1.107', line 474
                   Contact Microsoft Technical Support

The program has only one line of executable code, which is a memcpy
statement. If the program is recompiled at warning level 3, it becomes
obvious that the header file <memory.h> has not been included. If the
proper header file is included, the program will not compile, giving
the following two errors:

   Error C2172 : 'memcpy' : actual is not a pointer : parameter 1
   Error C2172 : 'memcpy' : actual is not a pointer : parameter 2

The program is in error. Instead of trying to pass structures to
memcpy, it should pass a pointers to structure. To solve the problem,
correct the program to pass pointers to structure.

Program Sample
--------------

#include <stdio.h>

struct r_buff
{
   union
      {
      unsigned char far *in_offset;
      struct
         {
         unsigned char *index;
         unsigned char *segment;
         } in_s;
      } in_u;
   unsigned char *out_index;
   unsigned char *lim;
   unsigned char *first;
   int loww;
   int hiw;
   unsigned char stat;
   char reserved[5];
} read_b;

struct r_buff old_read_b;

void main(void)
{
  memcpy(old_read_b, read_b, sizeof(old_read_b));
  /* This code is incorrect.  Instead use:
      memcpy(&old_read_b, &read_b, sizeof(old_read_b));
  */
}

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