*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-
//config:config SHUF
-//config: bool "shuf"
+//config: bool "shuf (5.4 kb)"
//config: default y
//config: help
-//config: Generate random permutations
+//config: Generate random permutations
-//kbuild:lib-$(CONFIG_SHUF) += shuf.o
//applet:IF_SHUF(APPLET_NOEXEC(shuf, shuf, BB_DIR_USR_BIN, BB_SUID_DROP, shuf))
+//kbuild:lib-$(CONFIG_SHUF) += shuf.o
+
//usage:#define shuf_trivial_usage
-//usage: "[-e|-i LO-HI] [-n NUM] [-o FILE] [-z] [FILE|ARG...]"
+//usage: "[-e|-i L-H] [-n NUM] [-o FILE] [-z] [FILE|ARG...]"
//usage:#define shuf_full_usage "\n\n"
-//usage: "Write a random permutation of the input lines to standard output\n"
-//usage: "\n -e Treat each ARG as an input line"
-//usage: "\n -i L-H Treat each number L through H as an input line"
+//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 Write result to FILE instead of standard output"
+//usage: "\n -o FILE Write to FILE, not standard output"
//usage: "\n -z End lines with zero byte, not newline"
#include "libbb.h"
/* RAND_MAX can be as small as 32767 */
if (i > RAND_MAX)
r ^= rand() << 15;
- r %= i;
+ r %= i + 1;
tmp = lines[i];
lines[i] = lines[r];
lines[r] = tmp;
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);
+ opts = getopt32(argv, "^"
+ OPT_STR
+ "\0" "e--i:i--e"/* mutually exclusive */,
+ &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
*dash = '\0';
lo = xatou(opt_i_str);
hi = xatou(dash + 1);
- *dash = '-';
+ *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] = xstrdup(utoa(lo));
+ lines[i] = (char*)(uintptr_t)lo;
lo++;
}
} else {
eol = '\0';
for (i = 0; i < numlines; i++) {
- printf("%s%c", lines[i], eol);
+ 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);