mirror of
https://github.com/sheumann/hush.git
synced 2024-08-14 11:28:58 +00:00
reported by script :- scripts/fix_ws.sh Signed-off-by: Maninder Singh <maninder1.s@samsung.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* shuf: Write a random permutation of the input lines to standard output.
|
|
*
|
|
* Copyright (C) 2014 by Bartosz Golaszewski <bartekgola@gmail.com>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
//config:config SHUF
|
|
//config: bool "shuf"
|
|
//config: default y
|
|
//config: help
|
|
//config: Generate random permutations
|
|
|
|
//kbuild:lib-$(CONFIG_SHUF) += shuf.o
|
|
//applet:IF_SHUF(APPLET_NOEXEC(shuf, shuf, BB_DIR_USR_BIN, BB_SUID_DROP, shuf))
|
|
|
|
//usage:#define shuf_trivial_usage
|
|
//usage: "[-e|-i L-H] [-n NUM] [-o FILE] [-z] [FILE|ARG...]"
|
|
//usage:#define shuf_full_usage "\n\n"
|
|
//usage: "Randomly permute lines\n"
|
|
//usage: "\n -e Treat ARGs as lines"
|
|
//usage: "\n -i L-H Treat numbers L-H as lines"
|
|
//usage: "\n -n NUM Output at most NUM lines"
|
|
//usage: "\n -o FILE Write to FILE, not standard output"
|
|
//usage: "\n -z End lines with zero byte, not newline"
|
|
|
|
#include "libbb.h"
|
|
|
|
/* This is a NOEXEC applet. Be very careful! */
|
|
|
|
#define OPT_e (1 << 0)
|
|
#define OPT_i (1 << 1)
|
|
#define OPT_n (1 << 2)
|
|
#define OPT_o (1 << 3)
|
|
#define OPT_z (1 << 4)
|
|
#define OPT_STR "ei:n:o:z"
|
|
|
|
/*
|
|
* Use the Fisher-Yates shuffle algorithm on an array of lines.
|
|
*/
|
|
static void shuffle_lines(char **lines, unsigned numlines)
|
|
{
|
|
unsigned i;
|
|
unsigned r;
|
|
char *tmp;
|
|
|
|
srand(monotonic_us());
|
|
|
|
for (i = numlines-1; i > 0; i--) {
|
|
r = rand();
|
|
/* RAND_MAX can be as small as 32767 */
|
|
if (i > RAND_MAX)
|
|
r ^= rand() << 15;
|
|
r %= i;
|
|
tmp = lines[i];
|
|
lines[i] = lines[r];
|
|
lines[r] = tmp;
|
|
}
|
|
}
|
|
|
|
int shuf_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int shuf_main(int argc, char **argv)
|
|
{
|
|
unsigned opts;
|
|
char *opt_i_str, *opt_n_str, *opt_o_str;
|
|
unsigned i;
|
|
char **lines;
|
|
unsigned numlines;
|
|
char eol;
|
|
|
|
opt_complementary = "e--i:i--e"; /* mutually exclusive */
|
|
opts = getopt32(argv, OPT_STR, &opt_i_str, &opt_n_str, &opt_o_str);
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
/* Prepare lines for shuffling - either: */
|
|
if (opts & OPT_e) {
|
|
/* make lines from command-line arguments */
|
|
numlines = argc;
|
|
lines = argv;
|
|
} else
|
|
if (opts & OPT_i) {
|
|
/* create a range of numbers */
|
|
char *dash;
|
|
unsigned lo, hi;
|
|
|
|
dash = strchr(opt_i_str, '-');
|
|
if (!dash) {
|
|
bb_error_msg_and_die("bad range '%s'", opt_i_str);
|
|
}
|
|
*dash = '\0';
|
|
lo = xatou(opt_i_str);
|
|
hi = xatou(dash + 1);
|
|
*dash = '-';
|
|
if (hi < lo) {
|
|
bb_error_msg_and_die("bad range '%s'", opt_i_str);
|
|
}
|
|
|
|
numlines = (hi+1) - lo;
|
|
lines = xmalloc(numlines * sizeof(lines[0]));
|
|
for (i = 0; i < numlines; i++) {
|
|
lines[i] = (char*)(uintptr_t)lo;
|
|
lo++;
|
|
}
|
|
} else {
|
|
/* default - read lines from stdin or the input file */
|
|
FILE *fp;
|
|
|
|
if (argc > 1)
|
|
bb_show_usage();
|
|
|
|
fp = xfopen_stdin(argv[0] ? argv[0] : "-");
|
|
lines = NULL;
|
|
numlines = 0;
|
|
for (;;) {
|
|
char *line = xmalloc_fgetline(fp);
|
|
if (!line)
|
|
break;
|
|
lines = xrealloc_vector(lines, 6, numlines);
|
|
lines[numlines++] = line;
|
|
}
|
|
fclose_if_not_stdin(fp);
|
|
}
|
|
|
|
if (numlines != 0)
|
|
shuffle_lines(lines, numlines);
|
|
|
|
if (opts & OPT_o)
|
|
xmove_fd(xopen(opt_o_str, O_WRONLY|O_CREAT|O_TRUNC), STDOUT_FILENO);
|
|
|
|
if (opts & OPT_n) {
|
|
unsigned maxlines;
|
|
maxlines = xatou(opt_n_str);
|
|
if (numlines > maxlines)
|
|
numlines = maxlines;
|
|
}
|
|
|
|
eol = '\n';
|
|
if (opts & OPT_z)
|
|
eol = '\0';
|
|
|
|
for (i = 0; i < numlines; i++) {
|
|
if (opts & OPT_i)
|
|
printf("%u%c", (unsigned)(uintptr_t)lines[i], eol);
|
|
else
|
|
printf("%s%c", lines[i], eol);
|
|
}
|
|
|
|
fflush_stdout_and_exit(EXIT_SUCCESS);
|
|
}
|