/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2022 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/calls/calls.h"
#include "libc/stdio/stdio.h"
#include "libc/testlib/testlib.h"

char testlib_enable_tmp_setup_teardown;

TEST(fread, eofIsSticky) {
  FILE *fo, *fi;
  char b[10] = "hello";
  ASSERT_NE(NULL, (fo = fopen("foo", "w")));
  ASSERT_NE(NULL, (fi = fopen("foo", "r")));
  ASSERT_EQ(0, fread(b, 1, 8, fi));
  ASSERT_TRUE(feof(fi));
  ASSERT_EQ(8, fwrite(b, 1, 8, fo));
  ASSERT_EQ(0, fflush(fo));
  ASSERT_EQ(0, fread(b, 1, 8, fi));
  ASSERT_TRUE(feof(fi));
  clearerr(fi);
  ASSERT_EQ(8, fread(b, 1, 10, fi));
  ASSERT_TRUE(feof(fi));
  ASSERT_EQ(0, fseek(fi, 0, SEEK_SET));
  ASSERT_FALSE(feof(fi));
  ASSERT_EQ(0, fclose(fi));
  ASSERT_EQ(0, fclose(fo));
}

TEST(fread, seekWithBuffer) {
  FILE *f;
  char b[8] = "hellosup";
  char c[8] = {0};
  char d[8] = {0};
  ASSERT_NE(NULL, (f = fopen("foo", "w")));
  ASSERT_EQ(8, fwrite(b, 1, 8, f));
  ASSERT_EQ(0, fclose(f));
  ASSERT_NE(NULL, (f = fopen("foo", "r")));
  ASSERT_EQ(5, fread(c, 1, 5, f));
  ASSERT_STREQ("hello", c);
  ASSERT_EQ(0, fseek(f, 1, SEEK_SET));
  ASSERT_EQ(5, fread(d, 1, 5, f));
  ASSERT_STREQ("ellos", d);
  ASSERT_EQ(0, fclose(f));
}
