Viewing file:  Wstringop-overflow-42.c (2.24 KB) -rw-r--r--
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/* Verify -Wstringop-overflow a with destination pointer pointing either
before the beginning or past the end of an object.
{ dg-do compile }
{ dg-options "-O -Wall -Wno-array-bounds -Wno-restrict" } */
typedef __SIZE_TYPE__ size_t;
char* strcpy (char *, const char *);
extern char a[1];
volatile char *d;
void cpy_si_1_max (int i, const char *s)
{
if (i < 1) i = 1;
d = strcpy (a + i, s); // { dg-warning "writing 1 or more bytes into a region of size 0" }
d = strcpy (a + i + 1, s); // { dg-warning "writing 1 or more bytes into a region of size 0" }
}
void cpy_ui_1_max (unsigned i, const char *s)
{
if (i < 1) i = 1;
d = strcpy (a + i, s); // { dg-warning "writing 1 or more bytes into a region of size 0" }
d = strcpy (a + i + 1, s); // { dg-warning "writing 1 or more bytes into a region of size 0" "" { xfail { ! lp64 } } }
}
void cpy_sl_1_max (long i, const char *s)
{
if (i < 1) i = 1;
d = strcpy (a + i, s); // { dg-warning "writing 1 or more bytes into a region of size 0" "" { target { ! ptr_eq_short } } }
d = strcpy (a + i + 1, s); // { dg-warning "writing 1 or more bytes into a region of size 0" "" { target { ! ptr_eq_short } } }
}
void cpy_ul_1_max (unsigned long i, const char *s)
{
if (i < 1) i = 1;
d = strcpy (a + i, s); // { dg-warning "writing 1 or more bytes into a region of size 0" "" { target { ! ptr_eq_short } } }
/* Because of integer wraparound the offset's range is [1, 0] so
the overflow isn't diagnosed (yet). */
d = strcpy (a + i + 1, s); // { dg-warning "writing 1 or more bytes into a region of size 0" "" { xfail *-*-* } }
}
void cpy_si_min_m1 (int i, const char *s)
{
if (i > -1) i = -1;
d = strcpy (a + i - 1, s); // { dg-warning "writing 1 or more bytes into a region of size 0" }
d = strcpy (a + i, s); // { dg-warning "writing 1 or more bytes into a region of size 0" }
d = strcpy (a + i + 2, s);
}
void cpy_sl_min_m1 (long i, const char *s)
{
if (i > -1) i = -1;
d = strcpy (a + i - 1, s); // { dg-warning "writing 1 or more bytes into a region of size 0" "" { target { ! ptr_eq_short } } }
d = strcpy (a + i, s); // { dg-warning "writing 1 or more bytes into a region of size 0" "" { target { ! ptr_eq_short } } }
d = strcpy (a + i + 2, s);
}
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