Viewing file:  Wstringop-truncation-3.c (1.82 KB) -rw-r--r--
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/* PR c/85931 - -Wsizeof-pointer-memaccess for strncpy with size of source
{ dg-do compile }
{ dg-require-effective-target alloca }
{ dg-options "-O2 -Wall -Wstringop-truncation -ftrack-macro-expansion=0" } */
typedef __SIZE_TYPE__ size_t;
extern char* strncpy (char*, const char*, size_t);
extern char a3[3], b3[3];
extern char a5[5], b5[5];
extern char ax[], bx[];
struct SA
{
char a3[3], b3[3];
char a5[5], b5[5];
char ax[];
};
void sink (void*, ...);
#define T(d, s, n) sink (strncpy (d, s, n))
void test_array (unsigned n)
{
T (a3, b3, 3);
/* For the following statemenmt, GCC 8.1 issues warning:
argument to ‘sizeof’ in ‘strncpy’ call is the same expression
as the source; did you mean to use the size of the destination?
Since the size of both the source and destination the warning
isn't helpful. Verify that it isn't issued. */
T (a3, b3, sizeof b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
T (a3, ax, sizeof a3); /* { dg-warning "\\\[-Wstringop-truncation" } */
T (ax, a3, sizeof a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */
char an[n], bn[n];
sink (an, bn);
T (an, bn, sizeof bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
}
void test_member_array (struct SA *sa, unsigned n)
{
T (sa->a3, sa->b3, 3);
T (sa->a3, sa->b3, sizeof sa->b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
T (sa->a3, sa->ax, sizeof sa->a3); /* { dg-warning "\\\[-Wstringop-truncation" } */
T (sa->ax, sa->a3, sizeof sa->a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */
struct VarLenStruct {
char an[n], bn[n];
} x;
sink (&x);
T (x.an, x.bn, sizeof x.bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
}
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