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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Robert Mustacchi
*/
/*
* Regression test for illumos#12392. Here, ftello64 didn't correctly handle an
* ungetc() in the write path when it was unbuffered.
*/
#include <stdio.h>
#include <err.h>
#include <stdlib.h>
static void
check_pos(FILE *f, long pos)
{
long l;
off_t off;
off64_t off64;
l = ftell(f);
off = ftello(f);
off64 = ftello64(f);
if (l != pos) {
errx(EXIT_FAILURE, "ftell position mismatched: found %ld, "
"expected %ld", l, pos);
}
if (off != pos) {
errx(EXIT_FAILURE, "ftello position mismatched: found %ld, "
"expected %ld", off, pos);
}
if (off64 != pos) {
errx(EXIT_FAILURE, "ftello64 position mismatched: found %ld, "
"expected %ld", off64, pos);
}
}
static void
check_one(FILE *f)
{
if (fputc('a', f) != 'a') {
err(EXIT_FAILURE, "failed to write character");
}
check_pos(f, 1);
if (ungetc('b', f) != 'b') {
err(EXIT_FAILURE, "failed to unget character");
}
check_pos(f, 0);
}
int
main(void)
{
FILE *f;
f = tmpfile();
if (f == NULL) {
err(EXIT_FAILURE, "failed to create temproary "
"file");
}
if (setvbuf(f, NULL, _IONBF, 0) != 0) {
err(EXIT_FAILURE, "failed to set non-buffering mode");
}
check_one(f);
if (fclose(f) != 0) {
err(EXIT_FAILURE, "failed to close temporary file");
}
return (0);
}
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