Viewing file:  strlen-6.c (2.77 KB) -rw-r--r--
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/* Test to verify that strlen() calls with conditional expressions
and unterminated arrays or pointers to such things as arguments
are evaluated without making assumptions about array sizes. */
extern __SIZE_TYPE__ strlen (const char *);
unsigned nfails;
#define A(expr, N) \
do { \
const char *_s = (expr); \
unsigned _n = strlen (_s); \
((_n == N) \
? 0 \
: (__builtin_printf ("line %i: strlen ((%s) = (\"%s\"))" \
" == %u failed\n", \
__LINE__, #expr, _s, N), \
++nfails)); \
} while (0)
volatile int i0 = 0;
const char ca[2][3] = { "12" };
const char cb[2][3] = { { '1', '2', '3', }, { '4' } };
char va[2][3] = { "123" };
char vb[2][3] = { { '1', '2', '3', }, { '4', '5' } };
const char *s = "123456";
static void test_binary_cond_expr_global (void)
{
A (i0 ? "1" : ca[0], 2);
A (i0 ? ca[0] : "123", 3);
/* The call to strlen (cb[0]) is strictly undefined because the array
isn't nul-terminated. This test verifies that the strlen range
optimization doesn't assume that the argument is necessarily nul
terminated.
Ditto for strlen (vb[0]). */
A (i0 ? "1" : cb[0], 4); /* GCC 8.2 failure */
A (i0 ? cb[0] : "12", 2);
A (i0 ? "1" : va[0], 3); /* GCC 8.2 failure */
A (i0 ? va[0] : "1234", 4);
A (i0 ? "1" : vb[0], 5); /* GCC 8.2 failure */
A (i0 ? vb[0] : "12", 2);
}
static void test_binary_cond_expr_local (void)
{
const char lca[2][3] = { "12" };
const char lcb[2][3] = { { '1', '2', '3', }, { '4' } };
char lva[2][3] = { "123" };
char lvb[2][3] = { { '1', '2', '3', }, { '4', '5' } };
/* Also undefined as above. */
A (i0 ? "1" : lca[0], 2);
A (i0 ? lca[0] : "123", 3);
A (i0 ? "1" : lcb[0], 4); /* GCC 8.2 failure */
A (i0 ? lcb[0] : "12", 2);
A (i0 ? "1" : lva[0], 3); /* GCC 8.2 failure */
A (i0 ? lva[0] : "1234", 4);
A (i0 ? "1" : lvb[0], 5); /* GCC 8.2 failure */
A (i0 ? lvb[0] : "12", 2);
}
static void test_ternary_cond_expr (void)
{
/* Also undefined. */
A (i0 == 0 ? s : i0 == 1 ? vb[0] : "123", 6);
A (i0 == 0 ? vb[0] : i0 == 1 ? s : "123", 5);
A (i0 == 0 ? "123" : i0 == 1 ? s : vb[0], 3);
}
const char (*pca)[3] = &ca[0];
const char (*pcb)[3] = &cb[0];
char (*pva)[3] = &va[0];
char (*pvb)[3] = &vb[0];
static void test_binary_cond_expr_arrayptr (void)
{
/* Also undefined. */
A (i0 ? *pca : *pcb, 4); /* GCC 8.2 failure */
A (i0 ? *pcb : *pca, 2);
A (i0 ? *pva : *pvb, 5); /* GCC 8.2 failure */
A (i0 ? *pvb : *pva, 3);
}
int main (void)
{
test_binary_cond_expr_global ();
test_binary_cond_expr_local ();
test_ternary_cond_expr ();
test_binary_cond_expr_arrayptr ();
if (nfails)
__builtin_abort ();
}
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