Viewing file:  Wstringop-truncation-5.c (1.53 KB) -rw-r--r--
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/* PR tree-optimization/87028 - false positive -Wstringop-truncation
strncpy with global variable source string
{ dg-do compile }
{ dg-options "-O2 -Wstringop-truncation" } */
char *strncpy (char *, const char *, __SIZE_TYPE__);
#define STR "1234567890"
struct S
{
char a[5], b[5];
};
const char arr[] = STR;
const char* const ptr = STR;
const char arr2[][10] = { "123", STR };
void test_literal (struct S *s)
{
strncpy (s->a, STR, sizeof s->a - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
s->a[sizeof s->a - 1] = '\0';
}
void test_global_arr (struct S *s)
{
strncpy (s->a, arr, sizeof s->a - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
s->a [sizeof s->a - 1] = '\0';
}
void test_global_arr2 (struct S *s)
{
strncpy (s->a, arr2[1], sizeof s->a - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
s->a [sizeof s->a - 1] = '\0';
strncpy (s->b, arr2[0], sizeof s->a - 1);
}
void test_global_ptr (struct S *s)
{
strncpy (s->a, ptr, sizeof s->a - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
s->a [sizeof s->a - 1] = '\0';
}
void test_local_arr (struct S *s)
{
const char arr[] = STR;
strncpy (s->a, arr, sizeof s->a - 1);
s->a [sizeof s->a - 1] = '\0';
}
void test_local_ptr (struct S *s)
{
const char* const ptr = STR;
strncpy (s->a, ptr, sizeof s->a - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
s->a [sizeof s->a - 1] = '\0';
}
void test_compound_literal (struct S *s)
{
strncpy (s->a, (char[]){ STR }, sizeof s->a - 1);
s->a [sizeof s->a - 1] = '\0';
}
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