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/* vi: set sw=4 ts=4: */
/*
* uniq implementation for busybox
*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
* Licensed under GPL v2, see file LICENSE in this tarball for details.
*
*/
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "busybox.h"
#include "libcoreutils/coreutils.h"
/* The extra data is flags to make -d and -u switch each other off */
static const char uniq_opts[] = "cudf:s:\0\7\3\5\1\2\4";
#define SHOW_COUNT 1
#define SHOW_UNIQUE 2
#define SHOW_DUPLICATE 4
static FILE *open_arg(char **argv, char *mode)
{
char *n=*argv;
return (n && *n != '-' && n[1]) ? bb_xfopen(n, mode) :
*mode=='r' ? stdin : stdout;
}
int uniq_main(int argc, char **argv)
{
FILE *in, *out;
unsigned long dups, skip_fields, skip_chars, i;
const char *oldline, *oldskipped, *line, *skipped, *input_filename;
int opt;
int uniq_flags = SHOW_UNIQUE | SHOW_DUPLICATE;
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);
/* This bit uses the extra data at the end of uniq_opts to make
* -d and -u switch each other off in a very small amount of space */
else if ((line = strchr(uniq_opts, opt)) != NULL) {
uniq_flags &= line[8];
uniq_flags |= line[11];
} else bb_show_usage();
}
input_filename = *(argv += optind);
in = open_arg(argv, "r");
if (*argv) ++argv;
out = open_arg(argv, "w");
if (*argv && argv[1]) bb_show_usage();
line = skipped = NULL;
NOT_DUPLICATE:
oldline = line;
oldskipped = skipped;
dups = 0;
/* gnu uniq ignores newlines */
while ((line = bb_get_chomped_line_from_file(in)) != NULL) {
skipped = line;
for (i=skip_fields ; i ; i--) {
skipped = bb_skip_whitespace(skipped);
while (*skipped && !isspace(*skipped)) ++skipped;
}
for (i = skip_chars ; *skipped && i ; i--) ++skipped;
if (oldline) {
if (!strcmp(oldskipped, skipped)) {
++dups; /* Note: Testing for overflow seems excessive. */
continue;
}
DO_LAST:
if (uniq_flags & (dups ? SHOW_DUPLICATE : SHOW_UNIQUE)) {
bb_fprintf(out, "\0%7d " + (uniq_flags & SHOW_COUNT), dups + 1);
bb_fprintf(out, "%s\n", oldline);
}
free((void *)oldline);
}
goto NOT_DUPLICATE;
}
if (oldline) goto DO_LAST;
bb_xferror(in, input_filename);
bb_fflush_stdout_and_exit(EXIT_SUCCESS);
}
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