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nodejs/test/wasi/c/ftruncate.c
cjihrig 2abbaddca9
test: add WASI test for file resizing
This commit adds a WASI test to cover the following functions:

- __wasi_fd_filestat_set_size()
- __wasi_fd_tell()

PR-URL: https://github.com/nodejs/node/pull/31617
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
2020-07-13 11:51:18 -04:00

40 lines
901 B
C

#include <sys/stat.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#define BASE_DIR "/tmp"
#define OUTPUT_DIR BASE_DIR "/testdir"
#define PATH OUTPUT_DIR "/output.txt"
int main(void) {
struct stat st;
int fd;
(void)st;
assert(0 == mkdir(OUTPUT_DIR, 0755));
fd = open(PATH, O_CREAT | O_WRONLY, 0666);
assert(fd != -1);
/* Verify that the file is initially empty. */
assert(0 == fstat(fd, &st));
assert(st.st_size == 0);
assert(0 == lseek(fd, 0, SEEK_CUR));
/* Increase the file size using ftruncate(). */
assert(0 == ftruncate(fd, 500));
assert(0 == fstat(fd, &st));
assert(st.st_size == 500);
assert(0 == lseek(fd, 0, SEEK_CUR));
/* Truncate the file using ftruncate(). */
assert(0 == ftruncate(fd, 300));
assert(0 == fstat(fd, &st));
assert(st.st_size == 300);
assert(0 == lseek(fd, 0, SEEK_CUR));
assert(0 == close(fd));
return 0;
}