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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2026 Keith Packard
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <assert.h>
#include <string.h>
#ifdef __PICOLIBC__
static FILE *fdevfile;
static char fdevbuf[BUFSIZ];
static size_t fdevoff;
static int __nonnull((2))
test_put(char c, FILE *f)
{
assert(f == fdevfile);
assert(fdevoff < BUFSIZ);
fdevbuf[fdevoff++] = c;
return 0;
}
static int __nonnull((1))
test_get(FILE *f)
{
assert(f == fdevfile);
assert(fdevoff < BUFSIZ);
return fdevbuf[fdevoff++];
}
static int __nonnull((1))
test_flush(FILE *f)
{
assert(f == fdevfile);
assert(fdevoff < BUFSIZ);
fdevbuf[fdevoff] = '\0';
return 0;
}
#define TEST_STRING "hello, world\n"
int
main(void)
{
static char mybuf[BUFSIZ];
char *ret;
/* Open file for writing */
fdevfile = fdevopen(test_put, NULL, test_flush);
/* Make sure fdevopen succeeded */
assert(fdevfile);
/* Write a string to the buffer */
fputs(TEST_STRING, fdevfile);
/* Close the file */
fclose(fdevfile);
/* Verify that the expected string was written */
assert(strcmp(fdevbuf, TEST_STRING) == 0);
/* Reset the file position */
fdevoff = 0;
/* Open file for reading */
fdevfile = fdevopen(NULL, test_get, NULL);
/* Make sure fdevopen succeeded */
assert(fdevfile);
/* Read a string from the buffer */
ret = fgets(mybuf, sizeof(mybuf), fdevfile);
/* Make sure fgets succeeded */
assert(ret == mybuf);
/* Verify that the expected string was read */
assert(strcmp(mybuf, TEST_STRING) == 0);
/* Close the file */
fclose(fdevfile);
return 0;
}
#else
int
main(void)
{
printf("fdevopen not supported, test skipped\n");
return 77;
}
#endif
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