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91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini sort implementation for busybox
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*
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*
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* Copyright (C) 2000 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 <getopt.h>
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#include <string.h>
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#include <stdlib.h>
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#include "busybox.h"
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static int compare_ascii(const void *x, const void *y)
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{
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return strcmp(*(char **)x, *(char **)y);
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}
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static int compare_numeric(const void *x, const void *y)
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{
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return atoi(*(char **)x) - atoi(*(char **)y);
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}
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int sort_main(int argc, char **argv)
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{
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FILE *fp;
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char *line, **lines = NULL;
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int i, opt, nlines = 0;
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int (*compare)(const void *, const void *) = compare_ascii;
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#ifdef BB_FEATURE_SORT_REVERSE
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int reverse = FALSE;
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#endif
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while ((opt = getopt(argc, argv, "nr")) != -1) {
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switch (opt) {
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case 'n':
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compare = compare_numeric;
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break;
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#ifdef BB_FEATURE_SORT_REVERSE
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case 'r':
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reverse = TRUE;
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break;
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#endif
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default:
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show_usage();
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}
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}
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/* read the input */
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for (i = optind; i == optind || i < argc; i++) {
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if (argv[i] == NULL)
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fp = stdin;
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else
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fp = xfopen(argv[i], "r");
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while ((line = get_line_from_file(fp)) != NULL) {
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lines = xrealloc(lines, sizeof(char *) * (nlines + 1));
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lines[nlines++] = line;
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}
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}
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/* sort it */
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qsort(lines, nlines, sizeof(char *), compare);
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/* print it */
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#ifdef BB_FEATURE_SORT_REVERSE
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if (reverse)
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for (i = nlines - 1; 0 <= i; i--)
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fputs(lines[i], stdout);
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else
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#endif
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for (i = 0; i < nlines; i++)
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fputs(lines[i], stdout);
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return EXIT_SUCCESS;
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}
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