source: branches/3.2/mindi-busybox/coreutils/comm.c @ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 years ago
  • Update mindi-busybox to 1.21.1
File size: 2.3 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini comm implementation for busybox
4 *
5 * Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10//usage:#define comm_trivial_usage
11//usage:       "[-123] FILE1 FILE2"
12//usage:#define comm_full_usage "\n\n"
13//usage:       "Compare FILE1 with FILE2\n"
14//usage:     "\n    -1  Suppress lines unique to FILE1"
15//usage:     "\n    -2  Suppress lines unique to FILE2"
16//usage:     "\n    -3  Suppress lines common to both files"
17
18#include "libbb.h"
19
20#define COMM_OPT_1 (1 << 0)
21#define COMM_OPT_2 (1 << 1)
22#define COMM_OPT_3 (1 << 2)
23
24/* writeline outputs the input given, appropriately aligned according to class */
25static void writeline(char *line, int class)
26{
27    int flags = option_mask32;
28    if (class == 0) {
29        if (flags & COMM_OPT_1)
30            return;
31    } else if (class == 1) {
32        if (flags & COMM_OPT_2)
33            return;
34        if (!(flags & COMM_OPT_1))
35            putchar('\t');
36    } else /*if (class == 2)*/ {
37        if (flags & COMM_OPT_3)
38            return;
39        if (!(flags & COMM_OPT_1))
40            putchar('\t');
41        if (!(flags & COMM_OPT_2))
42            putchar('\t');
43    }
44    puts(line);
45}
46
47int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
48int comm_main(int argc UNUSED_PARAM, char **argv)
49{
50    char *thisline[2];
51    FILE *stream[2];
52    int i;
53    int order;
54
55    opt_complementary = "=2";
56    getopt32(argv, "123");
57    argv += optind;
58
59    for (i = 0; i < 2; ++i) {
60        stream[i] = xfopen_stdin(argv[i]);
61    }
62
63    order = 0;
64    thisline[1] = thisline[0] = NULL;
65    while (1) {
66        if (order <= 0) {
67            free(thisline[0]);
68            thisline[0] = xmalloc_fgetline(stream[0]);
69        }
70        if (order >= 0) {
71            free(thisline[1]);
72            thisline[1] = xmalloc_fgetline(stream[1]);
73        }
74
75        i = !thisline[0] + (!thisline[1] << 1);
76        if (i)
77            break;
78        order = strcmp(thisline[0], thisline[1]);
79
80        if (order >= 0)
81            writeline(thisline[1], order ? 1 : 2);
82        else
83            writeline(thisline[0], 0);
84    }
85
86    /* EOF at least on one of the streams */
87    i &= 1;
88    if (thisline[i]) {
89        /* stream[i] is not at EOF yet */
90        /* we did not print thisline[i] yet */
91        char *p = thisline[i];
92        writeline(p, i);
93        while (1) {
94            free(p);
95            p = xmalloc_fgetline(stream[i]);
96            if (!p)
97                break;
98            writeline(p, i);
99        }
100    }
101
102    if (ENABLE_FEATURE_CLEAN_UP) {
103        fclose(stream[0]);
104        fclose(stream[1]);
105    }
106
107    return EXIT_SUCCESS;
108}
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