Viewing file:  Wstringop-truncation-2.c (1.78 KB) -rw-r--r--
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/* PR tree-optimization/84468 - bogus -Wstringop-truncation despite
assignment after conditional strncpy
{ dg-do compile }
{ dg-options "-O2 -Wstringop-truncation -g" } */
extern char* strncpy (char*, const char*, __SIZE_TYPE__);
char a[4];
void f1 (char *s)
{
int i = 0;
if (s[0] == '0')
{
i += 1;
strncpy (a, s, sizeof a); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
}
else
i += 2;
a[sizeof a - 1] = 0;
}
void f2 (char *s)
{
int i = 0;
if (s[0] == '0')
{
i += 1;
if (s[1] == '1')
{
i += 2;
strncpy (a, s, sizeof a); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
}
else
i += 3;
}
else
i += 4;
a[sizeof a - 1] = 0;
}
void f3 (char *s)
{
int i = 0;
if (s[0] == '0')
{
i += 1;
if (s[1] == '1')
{
i += 2;
if (s[2] == '2')
strncpy (a, s, sizeof a); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
else
i += 3;
}
else
i += 4;
}
else
i += 5;
a[sizeof a - 1] = 0;
}
void f4 (char *s)
{
int i = 0;
if (s[0] == '0')
{
i += 1;
if (s[1] == '1')
{
i += 2;
if (s[2] == '2')
{
i += 3;
if (s[3] == '3')
strncpy (a, s, sizeof a); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
else
i += 4;
}
else
i += 5;
}
else
i += 6;
}
else
i += 7;
a[sizeof a - 1] = 0;
}
void f4_warn (char *s)
{
int i = 0;
if (s[0] == '0')
{
i += 1;
if (s[1] == '1')
{
i += 2;
if (s[2] == '2')
{
i += 3;
if (s[3] == '3')
strncpy (a, s, sizeof a); /* { dg-warning "\\\[-Wstringop-truncation]" } */
else
i += 4;
}
else
i += 5;
}
else
i += 6;
}
else
i += 7;
}
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