| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * uniq implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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| 7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 8 | */
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| 9 |
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| 10 | /* BB_AUDIT SUSv3 compliant */
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| 11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
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| 12 |
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| 13 | #include "libbb.h"
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| 14 |
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| 15 | static const char uniq_opts[] ALIGN1 = "cdu" "f:s:" "cdu\0\1\2\4";
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| 16 |
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| 17 | static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
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| 18 | {
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| 19 | const char *n;
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| 20 |
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| 21 | n = *argv;
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| 22 | if (n != NULL) {
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| 23 | if ((*n != '-') || n[1]) {
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| 24 | return xfopen(n, "r\0w" + read0write2);
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| 25 | }
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| 26 | }
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| 27 | return (read0write2) ? stdout : stdin;
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| 28 | }
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| 29 |
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| 30 | int uniq_main(int argc, char **argv);
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| 31 | int uniq_main(int argc, char **argv)
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| 32 | {
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| 33 | FILE *in, *out;
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| 34 | unsigned long dups, skip_fields, skip_chars, i;
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| 35 | const char *s0, *e0, *s1, *e1, *input_filename;
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| 36 | unsigned opt;
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| 37 |
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| 38 | enum {
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| 39 | OPT_c = 0x1,
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| 40 | OPT_d = 0x2,
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| 41 | OPT_u = 0x4,
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| 42 | OPT_f = 0x8,
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| 43 | OPT_s = 0x10,
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| 44 | };
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| 45 |
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| 46 | skip_fields = skip_chars = 0;
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| 47 |
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| 48 | opt = getopt32(argv, "cduf:s:", &s0, &s1);
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| 49 | if (opt & OPT_f)
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| 50 | skip_fields = xatoul(s0);
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| 51 | if (opt & OPT_s)
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| 52 | skip_chars = xatoul(s1);
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| 53 | argv += optind;
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| 54 |
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| 55 | input_filename = *argv;
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| 56 |
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| 57 | in = xgetoptfile_uniq_s(argv, 0);
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| 58 | if (*argv) {
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| 59 | ++argv;
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| 60 | }
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| 61 | out = xgetoptfile_uniq_s(argv, 2);
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| 62 | if (*argv && argv[1]) {
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| 63 | bb_show_usage();
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| 64 | }
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| 65 |
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| 66 | s1 = e1 = NULL; /* prime the pump */
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| 67 |
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| 68 | do {
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| 69 | s0 = s1;
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| 70 | e0 = e1;
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| 71 | dups = 0;
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| 72 |
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| 73 | /* gnu uniq ignores newlines */
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| 74 | while ((s1 = xmalloc_getline(in)) != NULL) {
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| 75 | e1 = s1;
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| 76 | for (i = skip_fields; i; i--) {
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| 77 | e1 = skip_whitespace(e1);
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| 78 | e1 = skip_non_whitespace(e1);
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| 79 | }
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| 80 | for (i = skip_chars; *e1 && i; i--) {
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| 81 | ++e1;
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| 82 | }
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| 83 |
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| 84 | if (!s0 || strcmp(e0, e1)) {
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| 85 | break;
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| 86 | }
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| 87 |
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| 88 | ++dups; /* Note: Testing for overflow seems excessive. */
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| 89 | }
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| 90 |
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| 91 | if (s0) {
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| 92 | if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_e) */
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| 93 | fprintf(out, "\0%d " + (opt & 1), dups + 1);
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| 94 | fprintf(out, "%s\n", s0);
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| 95 | }
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| 96 | free((void *)s0);
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| 97 | }
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| 98 | } while (s1);
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| 99 |
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| 100 | die_if_ferror(in, input_filename);
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| 101 |
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| 102 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 103 | }
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