/*

* Copyright 2021 The Emscripten Authors. All rights reserved.

* Emscripten is available under two separate licenses, the MIT license and the

* University of Illinois/NCSA Open Source License. Both these licenses can be

* found in the LICENSE file.

*/

#include <assert.h>

#include <emscripten.h>

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <string.h>

#include <sys/uio.h>

#include <unistd.h>

// FIXME: The existing io.c file implements devices, which haven't been

// implemented in the new FS yet.

// This test simply implements the seek portion.

int main() {

char readBuffer[256] = {0};

char writeBuffer[] = "writeme";

int f = open("/file", O_RDWR | O_CREAT);

const char* msg = "1234567890";

write(f, msg, strlen(msg));

lseek(f, 0, SEEK_SET);

printf("read from file: %zd\n", read(f, readBuffer, sizeof readBuffer));

printf("data: %s\n", readBuffer);

memset(readBuffer, 0, sizeof readBuffer);

printf("errno: %d\n\n", errno);

errno = 0;

printf("pread past end of file: %zd\n",

pread(f, readBuffer, sizeof readBuffer, 999999999));

printf("data: %s\n", readBuffer);

memset(readBuffer, 0, sizeof readBuffer);

printf("errno: %d\n\n", errno);

errno = 0;

printf("seek: %lld\n", lseek(f, 3, SEEK_SET));

printf("errno: %d\n\n", errno);

printf("partial read from file: %zd\n", read(f, readBuffer, 3));

printf("data: %s\n", readBuffer);

memset(readBuffer, 0, sizeof readBuffer);

printf("errno: %d\n\n", errno);

errno = 0;

printf("seek: %lld\n", lseek(f, -2, SEEK_END));

printf("errno: %d\n", errno);

errno = 0;

printf("partial read from end of file: %zd\n", read(f, readBuffer, 3));

printf("data: %s\n", readBuffer);

memset(readBuffer, 0, sizeof readBuffer);

printf("errno: %d\n\n", errno);

errno = 0;

printf("before bad seek: %lld\n", lseek(f, 0, SEEK_CUR));

printf("errno: %d\n", errno);

errno = 0;

printf("bad seek: %lld\n", lseek(f, -15, SEEK_CUR));

printf("errno: %d\n", errno);

errno = 0;

printf("after bad seek: %lld\n", lseek(f, 0, SEEK_CUR));

printf("errno: %d\n", errno);

errno = 0;

printf("partial read from before start of file: %zd\n",

read(f, readBuffer, 3));

printf("data: %s\n", readBuffer);

memset(readBuffer, 0, sizeof readBuffer);

printf("errno: %d\n\n", errno);

errno = 0;

printf("seek: %lld\n", lseek(f, 0, SEEK_SET));

printf("write to start of file: %zd\n", write(f, writeBuffer, 3));

printf("errno: %d\n\n", errno);

errno = 0;

printf("seek: %lld\n", lseek(f, 0, SEEK_END));

printf("write to end of file: %zd\n", write(f, writeBuffer, 3));

printf("errno: %d\n\n", errno);

errno = 0;

printf("seek: %lld\n", lseek(f, 10, SEEK_END));

printf("write after end of file: %zd\n",

write(f, writeBuffer, sizeof writeBuffer));

printf("errno: %d\n\n", errno);

errno = 0;

printf("pwrite to the middle of file: %zd\n",

pwrite(f, writeBuffer + 2, 3, 17));

printf("errno: %d\n", errno);

printf("seek: %lld\n\n", lseek(f, 0, SEEK_CUR));

errno = 0;

printf("pwrite past end of file: %zd\n", pwrite(f, writeBuffer, 5, 32));

printf("errno: %d\n", errno);

printf("seek: %lld\n\n", lseek(f, 0, SEEK_CUR));

errno = 0;

ssize_t bytesRead;

printf("seek: %lld\n", lseek(f, 0, SEEK_SET));

printf("read after write: %zd\n",

bytesRead = read(f, readBuffer, sizeof readBuffer));

printf("errno: %d\n", errno);

errno = 0;

printf("final: ");

for (ssize_t i = 0; i < bytesRead; i++) {

if (readBuffer[i] == 0) {

printf("\\0");

} else {

printf("%c", readBuffer[i]);

}

}

printf("\n");

return 0;

}