1 /* vi: set sw=4 ts=4: */
3 * uniq implementation for busybox
5 * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
7 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
10 /* BB_AUDIT SUSv3 compliant */
11 /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
15 static const char uniq_opts[] ALIGN1 = "cdu" "f:s:" "cdu\0\1\2\4";
17 static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
23 if ((*n != '-') || n[1]) {
24 return xfopen(n, "r\0w" + read0write2);
27 return (read0write2) ? stdout : stdin;
30 int uniq_main(int argc, char **argv);
31 int uniq_main(int argc, char **argv)
34 unsigned long dups, skip_fields, skip_chars, i;
35 const char *s0, *e0, *s1, *e1, *input_filename;
46 skip_fields = skip_chars = 0;
48 opt = getopt32(argv, "cduf:s:", &s0, &s1);
50 skip_fields = xatoul(s0);
52 skip_chars = xatoul(s1);
55 input_filename = *argv;
57 in = xgetoptfile_uniq_s(argv, 0);
61 out = xgetoptfile_uniq_s(argv, 2);
62 if (*argv && argv[1]) {
66 s1 = e1 = NULL; /* prime the pump */
73 /* gnu uniq ignores newlines */
74 while ((s1 = xmalloc_getline(in)) != NULL) {
76 for (i = skip_fields; i; i--) {
77 e1 = skip_whitespace(e1);
78 e1 = skip_non_whitespace(e1);
80 for (i = skip_chars; *e1 && i; i--) {
84 if (!s0 || strcmp(e0, e1)) {
88 ++dups; /* Note: Testing for overflow seems excessive. */
92 if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_e) */
93 fprintf(out, "\0%d " + (opt & 1), dups + 1);
94 fprintf(out, "%s\n", s0);
100 die_if_ferror(in, input_filename);
102 fflush_stdout_and_exit(EXIT_SUCCESS);