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/* Test the sprintf (buf, "%s", buf) does not override buf.
Copyright (C) 2019-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <support/check.h>
enum
{
FUNCTION_FIRST,
FUNCTION_SPRINTF = FUNCTION_FIRST,
FUNCTION_SNPRINF,
FUNCTION_VSPRINTF,
FUNCTION_VSNPRINTF,
FUNCTION_LAST
};
static void
do_one_test (int function, char *buf, ...)
{
va_list args;
char *arg;
/* Expected results for fortified and non-fortified sprintf. */
#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 1
const char *expected = "CD";
#else
const char *expected = "ABCD";
#endif
va_start (args, buf);
arg = va_arg (args, char *);
va_end (args);
switch (function)
{
/* The regular sprintf and vsprintf functions do not override the
destination buffer, even if source and destination overlap. */
case FUNCTION_SPRINTF:
sprintf (buf, "%sCD", buf);
TEST_COMPARE_STRING (buf, expected);
break;
case FUNCTION_VSPRINTF:
va_start (args, buf);
vsprintf (arg, "%sCD", args);
TEST_COMPARE_STRING (arg, expected);
va_end (args);
break;
/* On the other hand, snprint and vsnprint override overlapping
source and destination buffers. */
case FUNCTION_SNPRINF:
snprintf (buf, 3, "%sCD", buf);
TEST_COMPARE_STRING (buf, "CD");
break;
case FUNCTION_VSNPRINTF:
va_start (args, buf);
vsnprintf (arg, 3, "%sCD", args);
TEST_COMPARE_STRING (arg, "CD");
va_end (args);
break;
default:
support_record_failure ();
}
}
static int
do_test (void)
{
char buf[8];
int i;
/* For each function in the enum do:
- reset the buffer to the initial state "AB";
- call the function with buffer as source and destination;
- check for the desired behavior. */
for (i = FUNCTION_FIRST; i < FUNCTION_LAST; i++)
{
strncpy (buf, "AB", 3);
do_one_test (i, buf, buf);
}
return 0;
}
#include <support/test-driver.c>
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