1  /* PR 35503 - Warn about restricted pointers
       2     Test to exercise that -Wrestrict warnings are issued for memory and
       3     sring functions when they are declared in system headers (i.e., not
       4     just when they are explicitly declared in the source file.)
       5     Also verify that the warnings are issued even for calls where the
       6     source of the aliasing violation is in a different function than
       7     the restricted call.
       8     { dg-do compile }
       9     { dg-options "-O2 -Wrestrict" } */
      10  
      11  #if __has_include (<stddef.h>)
      12  #  include <stddef.h>
      13  #else
      14  /* For cross-compilers.  */
      15  typedef __PTRDIFF_TYPE__   ptrdiff_t;
      16  typedef __SIZE_TYPE__      size_t;
      17  #endif
      18  
      19  #if __has_include (<string.h>)
      20  #  include <string.h>
      21  #  undef memcpy
      22  #  undef strcat
      23  #  undef strcpy
      24  #  undef strncat
      25  #  undef strncpy
      26  #else
      27  extern void* memcpy (void*, const void*, size_t);
      28  extern char* strcat (char*, const char*);
      29  extern char* strcpy (char*, const char*);
      30  extern char* strncat (char*, const char*, size_t);
      31  extern char* strncpy (char*, const char*, size_t);
      32  #endif
      33  
      34  
      35  static void wrap_memcpy (void *d, const void *s, size_t n)
      36  {
      37    memcpy (d, s, n);   /* { dg-warning "accessing 2 bytes at offsets 0 and 1 overlaps 1 byte at offset 1" "memcpy" } */
      38  }
      39  
      40  void call_memcpy (char *d)
      41  {
      42    const void *s = d + 1;
      43    wrap_memcpy (d, s, 2);
      44  }
      45  
      46  
      47  static void wrap_strcat (char *d, const char *s)
      48  {
      49    strcat (d, s);   /* { dg-warning "source argument is the same as destination" "strcat" } */
      50  }
      51  
      52  void call_strcat (char *d)
      53  {
      54    const char *s = d;
      55    wrap_strcat (d, s);
      56  }
      57  
      58  
      59  static void wrap_strcpy (char *d, const char *s)
      60  {
      61    strcpy (d, s);   /* { dg-warning "source argument is the same as destination" "strcpy" } */
      62  }
      63  
      64  void call_strcpy (char *d)
      65  {
      66    const char *s = d;
      67    wrap_strcpy (d, s);
      68  }
      69  
      70  
      71  static void wrap_strncat (char *d, const char *s, size_t n)
      72  {
      73    strncat (d, s, n);   /* { dg-warning "source argument is the same as destination" "strncat" } */
      74  }
      75  
      76  void call_strncat (char *d, size_t n)
      77  {
      78    const char *s = d;
      79    wrap_strncat (d, s, n);
      80  }
      81  
      82  
      83  static void wrap_strncpy (char *d, const char *s, size_t n)
      84  {
      85    strncpy (d, s, n);   /* { dg-warning "source argument is the same as destination" "strncpy" } */
      86  }
      87  
      88  void call_strncpy (char *d, size_t n)
      89  {
      90    const char *s = d;
      91    wrap_strncpy (d, s, n);
      92  }