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 */
20 static const char uniq_opts[] = "f:s:" "cdu\0\1\2\4";
22 static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
26 if ((n = *argv) != NULL) {
27 if ((*n != '-') || n[1]) {
28 return bb_xfopen(n, "r\0w" + read0write2);
31 return (read0write2) ? stdout : stdin;
34 int uniq_main(int argc, char **argv)
37 unsigned long dups, skip_fields, skip_chars, i, uniq_flags;
38 const char *s0, *e0, *s1, *e1, *input_filename;
41 uniq_flags = skip_fields = skip_chars = 0;
43 while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
44 if ((opt == 'f') || (opt == 's')) {
45 int t = bb_xgetularg10(optarg);
51 } else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
58 input_filename = *(argv += optind);
60 in = xgetoptfile_uniq_s(argv, 0);
64 out = xgetoptfile_uniq_s(argv, 2);
65 if (*argv && argv[1]) {
69 s1 = e1 = NULL; /* prime the pump */
76 /* gnu uniq ignores newlines */
77 while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) {
79 for (i=skip_fields ; i ; i--) {
80 e1 = bb_skip_whitespace(e1);
81 while (*e1 && !isspace(*e1)) {
85 for (i = skip_chars ; *e1 && i ; i--) {
89 if (!s0 || strcmp(e0, e1)) {
93 ++dups; /* Note: Testing for overflow seems excessive. */
97 if (!(uniq_flags & (2 << !!dups))) {
98 bb_fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1);
99 bb_fprintf(out, "%s\n", s0);
105 bb_xferror(in, input_filename);
107 bb_fflush_stdout_and_exit(EXIT_SUCCESS);