hush/coreutils/sort.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini sort implementation for busybox
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*
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* Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
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/* BB_AUDIT SUSv3 _NOT_ compliant -- a number of options are not supported. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html */
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Now does proper error checking on i/o. Plus some space savings.
*/
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <unistd.h>
#include "busybox.h"
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#include "libcoreutils/coreutils.h"
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static int compare_ascii(const void *x, const void *y)
{
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return strcmp(*(char **)x, *(char **)y);
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}
static int compare_numeric(const void *x, const void *y)
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{
int z = atoi(*(char **)x) - atoi(*(char **)y);
return z ? z : strcmp(*(char **)x, *(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;
char *line, **lines = NULL;
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int i, nlines = 0, inc;
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int (*compare)(const void *, const void *) = compare_ascii;
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int flags;
bb_default_error_retval = 2;
flags = bb_getopt_ulflags(argc, argv, "nru");
if (flags & 1) {
compare = compare_numeric;
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}
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argv += optind;
if (!*argv) {
*--argv = "-";
}
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do {
fp = xgetoptfile_sort_uniq(argv, "r");
while ((line = bb_get_chomped_line_from_file(fp)) != NULL) {
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lines = xrealloc(lines, sizeof(char *) * (nlines + 1));
lines[nlines++] = line;
}
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bb_xferror(fp, *argv);
bb_fclose_nonstdin(fp);
} while (*++argv);
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/* sort it */
qsort(lines, nlines, sizeof(char *), compare);
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/* print it */
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i = 0;
--nlines;
if ((inc = 1 - (flags & 2)) < 0) { /* reverse */
i = nlines;
}
flags &= 4;
while (nlines >= 0) {
if (!flags || !nlines || strcmp(lines[i+inc], lines[i])) {
puts(lines[i]);
}
i += inc;
--nlines;
}
bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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}