gcc/testsuite/c-c++-common/Wstringop-truncation-2.c

   1 /* Verify that
   2    { dg-do compile }
   3    { dg-options "-O2 -Wstringop-truncation -Wno-stringop-overflow -ftrack-macro-expansion=0" } */
   4
   5 typedef __SIZE_TYPE__ size_t;
   6
   7 #define stpncpy(d, s, n) __builtin_stpncpy ((d), (s), (n))
   8 #define strncpy(d, s, n) __builtin_stpncpy ((d), (s), (n))
   9
  10 void sink (void*);
  11
  12 struct A {
  13   char arr[3] __attribute__ ((nonstring));
  14   char str[3];
  15 };
  16
  17 struct B { struct A a[3]; int i; };
  18 struct C { struct B b[3]; int i; };
  19
  20 void stpncpy_arr_1 (struct C *pc, const char *s)
  21 {
  22   stpncpy (pc->b[0].a[0].arr, s, sizeof pc->b[0].a[0].arr);
  23   sink (pc->b[0].a[0].arr);
  24
  25   stpncpy (pc->b[0].a[1].arr, s, sizeof pc->b[0].a[1].arr);
  26   sink (pc->b[0].a[1].arr);
  27
  28   stpncpy (pc->b[0].a[2].arr, s, sizeof pc->b[0].a[2].arr);
  29   sink (pc->b[0].a[2].arr);
  30
  31   stpncpy (pc->b[1].a[0].arr, s, sizeof pc->b[1].a[0].arr);
  32   sink (pc->b[1].a[0].arr);
  33
  34   stpncpy (pc->b[1].a[1].arr, s, sizeof pc->b[1].a[1].arr);
  35   sink (pc->b[1].a[1].arr);
  36
  37   stpncpy (pc->b[1].a[2].arr, s, sizeof pc->b[1].a[2].arr);
  38   sink (pc->b[1].a[2].arr);
  39
  40   stpncpy (pc->b[2].a[0].arr, s, sizeof pc->b[2].a[0].arr);
  41   sink (pc->b[2].a[0].arr);
  42
  43   stpncpy (pc->b[2].a[1].arr, s, sizeof pc->b[2].a[1].arr);
  44   sink (pc->b[2].a[1].arr);
  45
  46   stpncpy (pc->b[2].a[2].arr, s, sizeof pc->b[2].a[2].arr);
  47   sink (pc->b[2].a[2].arr);
  48 }
  49
  50 void stpncpy_str_nowarn_1 (struct C *pc, const char *s)
  51 {
  52   stpncpy (pc->b[0].a[0].str, s, sizeof pc->b[0].a[0].str)[-1] = 0;   /* { dg-bogus "\\\[-Wstringop-truncation" } */
  53 }
  54
  55 void stpncpy_str_nowarn_2 (struct C *pc, const char *s)
  56 {
  57   *stpncpy (pc->b[0].a[0].str, s, sizeof pc->b[0].a[0].str - 1) = 0;   /* { dg-bogus "\\\[-Wstringop-truncation" } */
  58 }
  59
  60 void stpncpy_str_nowarn_3 (struct C *pc, const char *s)
  61 {
  62   char *d = stpncpy (pc->b[0].a[0].str, s, sizeof pc->b[0].a[0].str);   /* { dg-bogus "\\\[-Wstringop-truncation" } */
  63
  64   d[-1] = 0;
  65 }
  66
  67 void stpncpy_str_nowarn_4 (struct C *pc, const char *s)
  68 {
  69   char *d = stpncpy (pc->b[0].a[0].str, s, sizeof pc->b[0].a[0].str - 1);   /* { dg-bogus "\\\[-Wstringop-truncation" } */
  70
  71   *d = 0;
  72 }
  73
  74 void strncpy_arr_1 (struct C *pc, const char *s)
  75 {
  76   strncpy (pc->b[0].a[0].arr, s, sizeof pc->b[0].a[0].arr);
  77   sink (pc->b[0].a[0].arr);
  78
  79   strncpy (pc->b[0].a[1].arr, s, sizeof pc->b[0].a[1].arr);
  80   sink (pc->b[0].a[1].arr);
  81
  82   strncpy (pc->b[0].a[2].arr, s, sizeof pc->b[0].a[2].arr);
  83   sink (pc->b[0].a[2].arr);
  84 }
  85
  86 void strncpy_str_nowarn_1 (struct C *pc, const char *s)
  87 {
  88   strncpy (pc->b[0].a[0].str, s, sizeof pc->b[0].a[0].str);   /* { dg-bogus "\\\[-Wstringop-truncation" } */
  89
  90   pc->b[0].a[0].str[sizeof pc->b[0].a[0].str - 1] = 0;
  91 }
  92
  93 void strncpy_str_warn_1 (struct C *pc, const char *s)
  94 {
  95   strncpy (pc->b[0].a[0].str, s, sizeof pc->b[0].a[0].str);   /* { dg-warning "specified bound 3 equals destination size" } */
  96
  97   pc->b[1].a[0].str[sizeof pc->b[0].a[0].str - 1] = 0;
  98 }
  99
 100 void strncpy_str_warn_2 (struct C *pc, const char *s)
 101 {
 102   strncpy (pc->b[0].a[0].str, s, sizeof pc->b[0].a[0].str);   /* { dg-warning "specified bound 3 equals destination size" } */
 103
 104   pc->b[0].a[1].str[sizeof pc->b[0].a[0].str - 1] = 0;
 105 }