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/* PR tree-optimization/102238 - missing -Wrestrict on sprintf formatting
a struct member into enclosing object
{ dg-do compile }
{ dg-options "-O2 -Wall -Wno-format-overflow" } */
extern int sprintf (char*, const char*, ...);
extern void sink (void*, ...);
struct A
{
char a[4];
};
struct B
{
struct A a1, a2;
};
extern struct B eb;
enum { B_a2_a_off = __builtin_offsetof (struct B, a2.a) };
void test_warn_src_decl_plus (void)
{
{
char *s = (char*)&eb + B_a2_a_off;
char *d = eb.a2.a;
sprintf (d, "%s", s); // { dg-warning "overlaps" }
}
{
// If strlen (s) > 0 there is overlap with a[1].
char *s = (char*)&eb + B_a2_a_off + 1;
char *d = eb.a2.a;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
{
// strlen (s) must be at most 1 so there can be no overlap with a.
char *s = (char*)&eb + B_a2_a_off + 2;
char *d = eb.a2.a;
sprintf (d, "%s", s); // { dg-bogus "-Wrestrict" }
}
{
// strlen (s) must be at most 0 so there can be no overlap with a.
char *s = (char*)&eb + B_a2_a_off + 3;
char *d = eb.a2.a;
sprintf (d, "%s", s); // { dg-bogus "-Wrestrict" }
}
}
void test_warn_src_ptr_plus (struct B *p)
{
{
char *s = (char*)p + B_a2_a_off;
char *d = p->a2.a;
sprintf (d, "%s", s); // { dg-warning "overlaps" }
}
{
// If strlen (s) > 0 there is overlap with a[1].
char *s = (char*)p + B_a2_a_off + 1;
char *d = p->a2.a;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
{
// strlen (s) must be at most 1 so there can be no overlap with a.
char *s = (char*)p + B_a2_a_off + 2;
char *d = p->a2.a;
sprintf (d, "%s", s); // { dg-bogus "-Wrestrict" }
}
{
// strlen (s) must be at most 0 so there can be no overlap with a.
char *s = (char*)p + B_a2_a_off + 3;
char *d = p->a2.a;
sprintf (d, "%s", s); // { dg-bogus "-Wrestrict" }
}
}
void test_warn_dst_decl_plus (void)
{
{
char *s = eb.a2.a;
char *d = (char*)&eb + B_a2_a_off;
sprintf (d, "%s", s); // { dg-warning "overlaps" }
}
{
// If strlen (a) > 0 there is overlap with a[1].
char *s = eb.a2.a;
char *d = (char*)&eb + B_a2_a_off + 1;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
{
// If strlen (a) > 1 there is overlap with a[2].
char *s = eb.a2.a;
char *d = (char*)&eb + B_a2_a_off + 2;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
{
// If strlen (a) > 2 there is overlap with a[3].
char *s = eb.a2.a;
char *d = (char*)&eb + B_a2_a_off + 3;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
}
void test_warn_dst_ptr_plus (struct B *p)
{
{
char *s = p->a2.a;
char *d = (char*)p + B_a2_a_off;
sprintf (d, "%s", s); // { dg-warning "overlaps" }
}
{
// If strlen (a) > 0 there is overlap with a[1].
char *s = p->a2.a;
char *d = (char*)p + B_a2_a_off + 1;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
{
// If strlen (a) > 1 there is overlap with a[2].
char *s = p->a2.a;
char *d = (char*)p + B_a2_a_off + 2;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
{
// If strlen (a) > 2 there is overlap with a[3].
char *s = p->a2.a;
char *d = (char*)p + B_a2_a_off + 3;
sprintf (d, "%s", s); // { dg-warning "may overlap" }
}
}
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