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/* Test of vasnprintf() and asnprintf() functions.
Copyright (C) 2007-2025 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
#include "vasnprintf.h"
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "macros.h"
static void
test_function (char * (*my_asnprintf) (char *, size_t *, const char *, ...))
{
char buf[8];
int size;
for (size = 0; size <= 8; size++)
{
size_t length = size;
char *result = my_asnprintf (NULL, &length, "%d", 12345);
ASSERT (result != NULL);
ASSERT (strcmp (result, "12345") == 0);
ASSERT (length == 5);
free (result);
}
for (size = 0; size <= 8; size++)
{
size_t length;
char *result;
memcpy (buf, "DEADBEEF", 8);
length = size;
result = my_asnprintf (buf, &length, "%d", 12345);
ASSERT (result != NULL);
ASSERT (strcmp (result, "12345") == 0);
ASSERT (length == 5);
if (size < 5 + 1)
ASSERT (result != buf);
ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
if (result != buf)
free (result);
}
/* Note: This test assumes IEEE 754 representation of 'double' floats. */
for (size = 0; size <= 8; size++)
{
size_t length;
char *result;
memcpy (buf, "DEADBEEF", 8);
length = size;
result = my_asnprintf (buf, &length, "%2.0f", 1.6314159265358979e+125);
ASSERT (result != NULL);
/* The exact result and the result on glibc systems is
163141592653589790215729350939528493057529598899734151772468186268423257777068536614838678161083520756952076273094236944990208
On Cygwin, the result is
163141592653589790215729350939528493057529600000000000000000000000000000000000000000000000000000000000000000000000000000000000
On HP-UX 11.31 / hppa and IRIX 6.5, the result is
163141592653589790000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
*/
ASSERT (strlen (result) == 126);
ASSERT (memcmp (result, "163141592653589790", 18) == 0);
ASSERT (length == 126);
if (size < 126 + 1)
ASSERT (result != buf);
ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
if (result != buf)
free (result);
}
/* Verify that [v]asnprintf() rejects a width > 2 GiB, < 4 GiB. */
{
size_t length;
char *s = my_asnprintf (NULL, &length, "x%03000000000dy\n", -17);
ASSERT (s == NULL);
ASSERT (errno == EOVERFLOW);
}
{
size_t length;
char *s = my_asnprintf (NULL, &length, "x%03000000000cy\n", '@');
ASSERT (s == NULL);
ASSERT (errno == EOVERFLOW);
}
/* Verify that [v]asnprintf() rejects a width > 4 GiB. */
{
size_t length;
char *s =
my_asnprintf (NULL, &length,
"x%04294967306dy\n", /* 2^32 + 10 */
-17);
ASSERT (s == NULL);
ASSERT (errno == EOVERFLOW);
}
{
size_t length;
char *s =
my_asnprintf (NULL, &length,
"x%04294967306cy\n", /* 2^32 + 10 */
'@');
ASSERT (s == NULL);
ASSERT (errno == EOVERFLOW);
}
{
size_t length;
char *s =
my_asnprintf (NULL, &length,
"x%018446744073709551626dy\n", /* 2^64 + 10 */
-17);
ASSERT (s == NULL);
ASSERT (errno == EOVERFLOW);
}
{
size_t length;
char *s =
my_asnprintf (NULL, &length,
"x%018446744073709551626cy\n", /* 2^64 + 10 */
'@');
ASSERT (s == NULL);
ASSERT (errno == EOVERFLOW);
}
}
static char *
my_asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...)
{
va_list args;
char *ret;
va_start (args, format);
ret = vasnprintf (resultbuf, lengthp, format, args);
va_end (args);
return ret;
}
static void
test_vasnprintf ()
{
test_function (my_asnprintf);
}
static void
test_asnprintf ()
{
test_function (asnprintf);
}
int
main ()
{
test_vasnprintf ();
test_asnprintf ();
return test_exit_status;
}
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