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[] = "f:s:" "cdu\0\1\2\4";
17 static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
21 if ((n = *argv) != NULL) {
22 if ((*n != '-') || n[1]) {
23 return xfopen(n, "r\0w" + read0write2);
26 return (read0write2) ? stdout : stdin;
29 int uniq_main(int argc, char **argv)
32 unsigned long dups, skip_fields, skip_chars, i, uniq_flags;
33 const char *s0, *e0, *s1, *e1, *input_filename;
36 uniq_flags = skip_fields = skip_chars = 0;
38 while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
39 if ((opt == 'f') || (opt == 's')) {
40 unsigned long t = xatoul(optarg);
46 } else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
53 input_filename = *(argv += optind);
55 in = xgetoptfile_uniq_s(argv, 0);
59 out = xgetoptfile_uniq_s(argv, 2);
60 if (*argv && argv[1]) {
64 s1 = e1 = NULL; /* prime the pump */
71 /* gnu uniq ignores newlines */
72 while ((s1 = xmalloc_getline(in)) != NULL) {
74 for (i = skip_fields; i; i--) {
75 e1 = skip_whitespace(e1);
76 while (*e1 && !isspace(*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 (!(uniq_flags & (2 << !!dups))) {
93 fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1);
94 fprintf(out, "%s\n", s0);
100 die_if_ferror(in, input_filename);
102 fflush_stdout_and_exit(EXIT_SUCCESS);