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14efdc58ce
This fixes the warning, and makes the binary smaller out of sheer pique. (Yes, since Manuel did this one it's nice tight code that took several attempts to shrink, but I was ticked.) Add the start of a test for uniq; this is about the first 1/3 of the tests we need for full susv3 coverage of uniq.
104 lines
2.5 KiB
C
104 lines
2.5 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) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPL v2, see file LICENSE in this tarball for details.
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*
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include "busybox.h"
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#include "libcoreutils/coreutils.h"
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/* The extra data is flags to make -d and -u switch each other off */
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static const char uniq_opts[] = "cudf:s:\0\7\3\5\1\2\4";
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#define SHOW_COUNT 1
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#define SHOW_UNIQUE 2
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#define SHOW_DUPLICATE 4
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static FILE *open_arg(char **argv, char *mode)
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{
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char *n=*argv;
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return (n && *n != '-' && n[1]) ? bb_xfopen(n, mode) :
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*mode=='r' ? stdin : stdout;
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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;
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const char *oldline, *oldskipped, *line, *skipped, *input_filename;
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int opt;
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int uniq_flags = SHOW_UNIQUE | SHOW_DUPLICATE;
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skip_fields = skip_chars = 0;
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while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
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if (opt == 'f') skip_fields = bb_xgetularg10(optarg);
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else if (opt == 's') skip_chars = bb_xgetularg10(optarg);
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/* This bit uses the extra data at the end of uniq_opts to make
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* -d and -u switch each other off in a very small amount of space */
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else if ((line = strchr(uniq_opts, opt)) != NULL) {
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uniq_flags &= line[8];
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uniq_flags |= line[11];
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} else bb_show_usage();
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}
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input_filename = *(argv += optind);
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in = open_arg(argv, "r");
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if (*argv) ++argv;
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out = open_arg(argv, "w");
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if (*argv && argv[1]) bb_show_usage();
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line = skipped = NULL;
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NOT_DUPLICATE:
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oldline = line;
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oldskipped = skipped;
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dups = 0;
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/* gnu uniq ignores newlines */
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while ((line = bb_get_chomped_line_from_file(in)) != NULL) {
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skipped = line;
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for (i=skip_fields ; i ; i--) {
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skipped = bb_skip_whitespace(skipped);
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while (*skipped && !isspace(*skipped)) ++skipped;
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}
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for (i = skip_chars ; *skipped && i ; i--) ++skipped;
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if (oldline) {
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if (!strcmp(oldskipped, skipped)) {
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++dups; /* Note: Testing for overflow seems excessive. */
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continue;
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}
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DO_LAST:
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if (uniq_flags & (dups ? SHOW_DUPLICATE : SHOW_UNIQUE)) {
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bb_fprintf(out, "\0%7d " + (uniq_flags & SHOW_COUNT), dups + 1);
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bb_fprintf(out, "%s\n", oldline);
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}
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free((void *)oldline);
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}
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goto NOT_DUPLICATE;
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}
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if (oldline) goto DO_LAST;
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bb_xferror(in, input_filename);
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bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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