1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29/* To avoid many issues, always build this as a Unicode program */
30#define UNICODE 1
31#define _UNICODE 1
32#include <windows.h>
33#include <tchar.h>
34#include <stdio.h>
35#include <stdlib.h>
36
37/* A brain-dead 'cmp' toolbox program for Windows, because comp.exe
38 * can't be silenced and doesn't return meaningful status code
39 */
40
41int main(void)
42{
43    int argc;
44    TCHAR** argv = CommandLineToArgvW(GetCommandLine(), &argc);
45
46    /* IMPORTANT: cmp only accepts optional -s as the first option, followed by two file
47     *            name.  Note that regardless "-s" this cmp always operate in silent mode
48     */
49    if (argc > 1 && argv[1][0] == L'-' && argv[1][1] == L's' && argv[1][2] == L'\0') {
50        argc--;
51        argv++;
52    }
53    if (argc != 3) {
54        _tprintf(L"Usage: cmp [-s] file1 file2\n");
55        exit(1);
56    }
57    FILE *f1 = _tfopen(argv[1], L"rb");
58    if (!f1) {
59        _tprintf(L"ERROR: can't open file %s\n", argv[1]);
60        exit(1);
61    }
62    FILE *f2 = _tfopen(argv[2], L"rb");
63    if (!f2) {
64        _tprintf(L"ERROR: can't open file %s\n", argv[2]);
65        fclose(f1);
66        exit(1);
67    }
68    #define BUFSIZE 4096
69    char buf1[BUFSIZE], buf2[BUFSIZE];
70    int n1, n2, ret = 0;
71    do {
72        n1 = fread(buf1, 1, BUFSIZE, f1);
73        n2 = fread(buf2, 1, BUFSIZE, f2);
74        ret = (n1 != n2) || memcmp(buf1, buf2, n1) != 0;
75    } while (!ret && n1 == BUFSIZE);
76    fclose(f1);
77    fclose(f2);
78
79    return ret;
80}
81