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57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini uniq implementation for busybox
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*
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*
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* Copyright (C) 1999,2000 by Lineo, inc.
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* Written by John Beppu <beppu@lineo.com>
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* Rewritten by Matt Kraai <kraai@alumni.carnegiemellon.edu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "busybox.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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int uniq_main(int argc, char **argv)
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{
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FILE *in = stdin, *out = stdout;
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char *lastline = NULL, *input;
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/* parse argv[] */
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if ((argc > 1 && **(argv + 1) == '-') || argc > 3)
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usage(uniq_usage);
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if (argv[1] != NULL) {
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in = xfopen(argv[1], "r");
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if (argv[2] != NULL)
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out = xfopen(argv[2], "w");
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}
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while ((input = get_line_from_file(in)) != NULL) {
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if (lastline == NULL || strcmp(input, lastline) != 0) {
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fputs(input, out);
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free(lastline);
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lastline = input;
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}
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}
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free(lastline);
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return EXIT_SUCCESS;
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}
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