Viewing file:  builtin-sprintf-warn-21.c (2.62 KB) -rw-r--r--
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/* PR tree-optimization/83431 -Wformat-truncation may incorrectly report
truncation
{ dg-do compile }
{ dg-options "-O2 -Wall -ftrack-macro-expansion=0" } */
typedef __SIZE_TYPE__ size_t;
extern int snprintf (char*, size_t, const char*, ...);
extern char* strcpy (char*, const char*);
struct S
{
char a9[9];
char a5[5];
int x;
};
void test_assign_nowarn (struct S* s)
{
int i = 0;
{
char a9[9] = "1234";
snprintf (s[i].a5, sizeof (s[i].a5), "%s", a9); /* { dg-bogus "\\\[-Wformat-truncation]" } */
}
{
++i;
char a8[8] = "123";
snprintf (s[i].a5, sizeof (s[i].a5), "%s\n", a8); /* { dg-bogus "\\\[-Wformat-truncation]" } */
}
{
++i;
char a7[7] = "12";
snprintf (s[i].a5, sizeof (s[i].a5), "[%s]", a7); /* { dg-bogus "\\\[-Wformat-truncation]" } */
}
{
++i;
char a6[6] = "1";
snprintf (s[i].a5, sizeof (s[i].a5), "[%s]\n", a6); /* { dg-bogus "\\\[-Wformat-truncation]" } */
}
}
void test_strcpy_nowarn (struct S* s)
{
int i = 0;
strcpy (s[i].a9, "1234");
snprintf (s[i].a5, sizeof (s[i].a5), "%s", s[i].a9);
++i;
strcpy (s[i].a9, "123");
snprintf (s[i].a5, sizeof (s[i].a5), "%s\n", s[i].a9); /* { dg-bogus "\\\[-Wformat-truncation]" } */
++i;
strcpy (s[i].a9, "12");
snprintf (s[i].a5, sizeof (s[i].a5), "[%s]", s[i].a9); /* { dg-bogus "\\\[-Wformat-truncation]" } */
++i;
strcpy (s[i].a9, "1");
snprintf (s[i].a5, sizeof (s[i].a5), "[%s]\n", s[i].a9); /* { dg-bogus "\\\[-Wformat-truncation]" } */
}
void test_warn (struct S* s)
{
int i = 0;
strcpy (s[i].a9, "12345678");
snprintf (s[i].a5, sizeof (s[i].a5), "%s", s[i].a9); /* { dg-warning "'%s' directive output truncated writing 8 bytes into a region of size 5" } */
++i;
strcpy (s[i].a9, "1234567");
snprintf (s[i].a5, sizeof (s[i].a5), "%s", s[i].a9); /* { dg-warning "'%s' directive output truncated writing 7 bytes into a region of size 5" } */
++i;
strcpy (s[i].a9, "123456");
snprintf (s[i].a5, sizeof (s[i].a5), "%s", s[i].a9); /* { dg-warning "'%s' directive output truncated writing 6 bytes into a region of size 5" } */
++i;
strcpy (s[i].a9, "12345");
snprintf (s[i].a5, sizeof (s[i].a5), "%s", s[i].a9); /* { dg-warning "'snprintf' output truncated before the last format character" } */
++i;
strcpy (s[i].a9, "1234");
snprintf (s[i].a5, sizeof (s[i].a5), "%s\n", s[i].a9); /* { dg-warning "output truncated before the last format character" } */
++i;
strcpy (s[i].a9, "123");
snprintf (s[i].a5, sizeof (s[i].a5), ">%s<", s[i].a9); /* { dg-warning "output truncated before the last format character" } */
}
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