/*
* uniq implementation for busybox
*
- * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
+ * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include "busybox.h"
#include "libcoreutils/coreutils.h"
-static const char uniq_opts[] = "f:s:cdu\0\7\3\5\1\2\4";
+static const char uniq_opts[] = "f:s:" "cdu\0\1\2\4";
+
+static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
+{
+ const char *n;
+
+ if ((n = *argv) != NULL) {
+ if ((*n != '-') || n[1]) {
+ return bb_xfopen(n, "r\0w" + read0write2);
+ }
+ }
+ return (read0write2) ? stdout : stdin;
+}
int uniq_main(int argc, char **argv)
{
FILE *in, *out;
- /* Note: Ignore the warning about dups and e0 possibly being uninitialized.
- * They will be initialized on the fist pass of the loop (since s0 is NULL). */
- unsigned long dups, skip_fields, skip_chars, i;
+ unsigned long dups, skip_fields, skip_chars, i, uniq_flags;
const char *s0, *e0, *s1, *e1, *input_filename;
int opt;
- int uniq_flags = 6; /* -u */
- skip_fields = skip_chars = 0;
+ uniq_flags = skip_fields = skip_chars = 0;
while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
- if (opt == 'f') {
- skip_fields = bb_xgetularg10(optarg);
- } else if (opt == 's') {
- skip_chars = bb_xgetularg10(optarg);
+ if ((opt == 'f') || (opt == 's')) {
+ int t = bb_xgetularg10(optarg);
+ if (opt == 'f') {
+ skip_fields = t;
+ } else {
+ skip_chars = t;
+ }
} else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
- uniq_flags &= s0[4];
- uniq_flags |= s0[7];
+ uniq_flags |= s0[4];
} else {
bb_show_usage();
}
input_filename = *(argv += optind);
- in = xgetoptfile_sort_uniq(argv, "r");
+ in = xgetoptfile_uniq_s(argv, 0);
if (*argv) {
++argv;
}
- out = xgetoptfile_sort_uniq(argv, "w");
+ out = xgetoptfile_uniq_s(argv, 2);
if (*argv && argv[1]) {
bb_show_usage();
}
- s0 = NULL;
+ s1 = e1 = NULL; /* prime the pump */
- /* gnu uniq ignores newlines */
- while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) {
- e1 = s1;
- for (i=skip_fields ; i ; i--) {
- e1 = bb_skip_whitespace(e1);
- while (*e1 && !isspace(*e1)) {
+ do {
+ s0 = s1;
+ e0 = e1;
+ dups = 0;
+
+ /* gnu uniq ignores newlines */
+ while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) {
+ e1 = s1;
+ for (i=skip_fields ; i ; i--) {
+ e1 = bb_skip_whitespace(e1);
+ while (*e1 && !isspace(*e1)) {
+ ++e1;
+ }
+ }
+ for (i = skip_chars ; *e1 && i ; i--) {
++e1;
}
+
+ if (!s0 || strcmp(e0, e1)) {
+ break;
+ }
+
+ ++dups; /* Note: Testing for overflow seems excessive. */
}
- for (i = skip_chars ; *e1 && i ; i--) {
- ++e1;
- }
+
if (s0) {
- if (strcmp(e0, e1) == 0) {
- ++dups; /* Note: Testing for overflow seems excessive. */
- continue;
- }
- DO_LAST:
- if ((dups && (uniq_flags & 2)) || (!dups && (uniq_flags & 4))) {
- bb_fprintf(out, "\0%7d\t" + (uniq_flags & 1), dups + 1);
+ if (!(uniq_flags & (2 << !!dups))) {
+ bb_fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1);
bb_fprintf(out, "%s\n", s0);
}
free((void *)s0);
}
-
- s0 = s1;
- e0 = e1;
- dups = 0;
- }
-
- if (s0) {
- e1 = NULL;
- goto DO_LAST;
- }
+ } while (s1);
bb_xferror(in, input_filename);