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104 lines
2.0 KiB
C
104 lines
2.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* uniq implementation for busybox
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*
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* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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/* BB_AUDIT SUSv3 compliant */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
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#include "busybox.h"
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static const char uniq_opts[] = "f:s:" "cdu\0\1\2\4";
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static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
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{
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const char *n;
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if ((n = *argv) != NULL) {
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if ((*n != '-') || n[1]) {
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return xfopen(n, "r\0w" + read0write2);
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}
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}
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return (read0write2) ? stdout : stdin;
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}
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int uniq_main(int argc, char **argv)
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{
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FILE *in, *out;
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unsigned long dups, skip_fields, skip_chars, i, uniq_flags;
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const char *s0, *e0, *s1, *e1, *input_filename;
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int opt;
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uniq_flags = skip_fields = skip_chars = 0;
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while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
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if ((opt == 'f') || (opt == 's')) {
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unsigned long t = xatoul(optarg);
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if (opt == 'f') {
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skip_fields = t;
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} else {
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skip_chars = t;
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}
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} else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
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uniq_flags |= s0[4];
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} else {
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bb_show_usage();
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}
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}
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input_filename = *(argv += optind);
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in = xgetoptfile_uniq_s(argv, 0);
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if (*argv) {
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++argv;
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}
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out = xgetoptfile_uniq_s(argv, 2);
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if (*argv && argv[1]) {
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bb_show_usage();
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}
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s1 = e1 = NULL; /* prime the pump */
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do {
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s0 = s1;
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e0 = e1;
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dups = 0;
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/* gnu uniq ignores newlines */
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while ((s1 = xmalloc_getline(in)) != NULL) {
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e1 = s1;
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for (i = skip_fields; i; i--) {
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e1 = skip_whitespace(e1);
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while (*e1 && !isspace(*e1)) {
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++e1;
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}
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}
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for (i = skip_chars; *e1 && i; i--) {
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++e1;
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}
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if (!s0 || strcmp(e0, e1)) {
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break;
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}
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++dups; /* Note: Testing for overflow seems excessive. */
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}
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if (s0) {
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if (!(uniq_flags & (2 << !!dups))) {
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fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1);
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fprintf(out, "%s\n", s0);
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}
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free((void *)s0);
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}
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} while (s1);
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die_if_ferror(in, input_filename);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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