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/* Test of u32_prev() function.
Copyright (C) 2010-2026 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>, 2010. */
#include <config.h>
#include "unistr.h"
#include "macros.h"
static int
check (const uint32_t *input, size_t input_length, ucs4_t *puc)
{
ucs4_t uc;
/* Test recognition when at the beginning of the string. */
if (u32_prev (&uc, input + input_length, input) != input)
return 1;
/* Test recognition when preceded by a 1-unit character. */
{
uint32_t buf[100];
uint32_t *ptr;
ucs4_t uc1;
ptr = buf;
*ptr++ = 0x1D51E;
for (size_t i = 0; i < input_length; i++)
ptr[i] = input[i];
if (u32_prev (&uc1, ptr + input_length, buf) != ptr)
return 2;
if (uc1 != uc)
return 3;
}
*puc = uc;
return 0;
}
static int
check_invalid (const uint32_t *input, size_t input_length)
{
ucs4_t uc;
/* Test recognition when at the beginning of the string. */
uc = 0xBADFACE;
if (u32_prev (&uc, input + input_length, input) != NULL)
return 1;
if (uc != 0xBADFACE)
return 2;
/* Test recognition when preceded by a 1-unit character. */
{
uint32_t buf[100];
uint32_t *ptr;
ptr = buf;
*ptr++ = 0x1D51E;
for (size_t i = 0; i < input_length; i++)
ptr[i] = input[i];
uc = 0xBADFACE;
if (u32_prev (&uc, ptr + input_length, buf) != NULL)
return 3;
if (uc != 0xBADFACE)
return 4;
}
return 0;
}
int
main ()
{
ucs4_t uc;
/* Test ISO 646 unit input. */
{
uint32_t buf[1];
for (ucs4_t c = 0; c < 0x80; c++)
{
buf[0] = c;
uc = 0xBADFACE;
ASSERT (check (buf, 1, &uc) == 0);
ASSERT (uc == c);
}
}
/* Test BMP unit input. */
{
static const uint32_t input[] = { 0x20AC };
uc = 0xBADFACE;
ASSERT (check (input, SIZEOF (input), &uc) == 0);
ASSERT (uc == 0x20AC);
}
/* Test non-BMP unit input. */
{
static const uint32_t input[] = { 0x1D51F };
uc = 0xBADFACE;
ASSERT (check (input, SIZEOF (input), &uc) == 0);
ASSERT (uc == 0x1D51F);
}
/* Test incomplete/invalid 1-unit input. */
{
static const uint32_t input[] = { 0x340000 };
ASSERT (check_invalid (input, SIZEOF (input)) == 0);
}
return test_exit_status;
}
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