1 /* vi: set sw=4 ts=4: */
3 * Mini sort implementation for busybox
6 * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 static int compare_ascii(const void *x, const void *y)
31 return strcmp(*(char **)x, *(char **)y);
34 static int compare_numeric(const void *x, const void *y)
36 return atoi(*(char **)x) - atoi(*(char **)y);
39 int sort_main(int argc, char **argv)
42 char *line, **lines = NULL;
43 int i, opt, nlines = 0;
44 int (*compare)(const void *, const void *) = compare_ascii;
45 #ifdef BB_FEATURE_SORT_REVERSE
49 while ((opt = getopt(argc, argv, "nr")) != -1) {
52 compare = compare_numeric;
54 #ifdef BB_FEATURE_SORT_REVERSE
65 for (i = optind; i == optind || i < argc; i++) {
69 fp = xfopen(argv[i], "r");
71 while ((line = get_line_from_file(fp)) != NULL) {
72 lines = xrealloc(lines, sizeof(char *) * (nlines + 1));
73 lines[nlines++] = line;
78 qsort(lines, nlines, sizeof(char *), compare);
81 #ifdef BB_FEATURE_SORT_REVERSE
83 for (i = nlines - 1; 0 <= i; i--)
84 fputs(lines[i], stdout);
87 for (i = 0; i < nlines; i++)
88 fputs(lines[i], stdout);