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/*
* Copyright 2013 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 <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <emscripten.h>
static void create_file(const char *path, const char *buffer, int mode) {
int fd = open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
assert(fd >= 0);
int err = write(fd, buffer, sizeof(char) * strlen(buffer));
assert(err == (sizeof(char) * strlen(buffer)));
close(fd);
}
void setup() {
create_file("/tmp/file.txt", "cd", 0666);
}
void cleanup() {
unlink("/tmp/file.txt");
}
void test() {
FILE *file;
int err;
char buffer[256];
file = fopen("/tmp/file.txt", "r");
assert(file);
// pushing EOF always returns EOF
rewind(file);
err = ungetc(EOF, file);
assert(err == EOF);
// ungetc should return itself
err = ungetc('a', file);
assert(err == (int)'a');
// fgetc should get it (note that we cannot push more than 1, as there is no portability guarantee for that)
err = fgetc(file);
assert(err == (int)'a');
// fread should get it first
ungetc('b', file);
int r = fread(buffer, sizeof(char), sizeof(buffer), file);
assert(r == 3);
buffer[3] = 0;
assert(!strcmp(buffer, "bcd"));
// rewind and fseek should reset anything that's been
// pushed to the stream
ungetc('a', file);
rewind(file);
err = fgetc(file);
assert(err == (int)'c');
ungetc('a', file);
fseek(file, 0, SEEK_SET);
err = fgetc(file);
assert(err == (int)'c');
// fgetc, when nothing is left, should return EOF
fseek(file, 0, SEEK_END);
err = fgetc(file);
assert(err == EOF);
err = feof(file);
assert(err);
// ungetc should reset the EOF indicator
ungetc('e', file);
err = feof(file);
// XXX musl fails here. it does not allow ungetc on a stream in EOF mode, which has been confirmed as a bug upstream
fclose(file);
puts("success");
}
int main() {
#ifdef NODEFS
EM_ASM(FS.mount(NODEFS, { root: '.' }, '/tmp'));
#elif MEMFS
EM_ASM(FS.mount(MEMFS, {}, '/tmp'));
#endif
atexit(cleanup);
signal(SIGABRT, cleanup);
setup();
test();
return EXIT_SUCCESS;
}
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