*
* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
-#include "busybox.h"
-#include <string.h>
-#include <ctype.h>
-#include <unistd.h>
-
-static const char uniq_opts[] = "f:s:" "cdu\0\1\2\4";
-
-static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
+//usage:#define uniq_trivial_usage
+//usage: "[-cdu][-f,s,w N] [INPUT [OUTPUT]]"
+//usage:#define uniq_full_usage "\n\n"
+//usage: "Discard duplicate lines\n"
+//usage: "\n -c Prefix lines by the number of occurrences"
+//usage: "\n -d Only print duplicate lines"
+//usage: "\n -u Only print unique lines"
+//usage: "\n -f N Skip first N fields"
+//usage: "\n -s N Skip first N chars (after any skipped fields)"
+//usage: "\n -w N Compare N characters in line"
+//usage:
+//usage:#define uniq_example_usage
+//usage: "$ echo -e \"a\\na\\nb\\nc\\nc\\na\" | sort | uniq\n"
+//usage: "a\n"
+//usage: "b\n"
+//usage: "c\n"
+
+#include "libbb.h"
+
+int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int uniq_main(int argc UNUSED_PARAM, char **argv)
{
- const char *n;
-
- if ((n = *argv) != NULL) {
- if ((*n != '-') || n[1]) {
- return bb_xfopen(n, "r\0w" + read0write2);
+ const char *input_filename;
+ unsigned skip_fields, skip_chars, max_chars;
+ unsigned opt;
+ char *cur_line;
+ const char *cur_compare;
+
+ enum {
+ OPT_c = 0x1,
+ OPT_d = 0x2, /* print only dups */
+ OPT_u = 0x4, /* print only uniq */
+ OPT_f = 0x8,
+ OPT_s = 0x10,
+ OPT_w = 0x20,
+ };
+
+ skip_fields = skip_chars = 0;
+ max_chars = INT_MAX;
+
+ opt_complementary = "f+:s+:w+";
+ opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars);
+ argv += optind;
+
+ input_filename = argv[0];
+ if (input_filename) {
+ const char *output;
+
+ if (input_filename[0] != '-' || input_filename[1]) {
+ close(STDIN_FILENO); /* == 0 */
+ xopen(input_filename, O_RDONLY); /* fd will be 0 */
}
- }
- return (read0write2) ? stdout : stdin;
-}
-
-int uniq_main(int argc, char **argv)
-{
- FILE *in, *out;
- unsigned long dups, skip_fields, skip_chars, i, uniq_flags;
- const char *s0, *e0, *s1, *e1, *input_filename;
- int opt;
-
- uniq_flags = skip_fields = skip_chars = 0;
-
- while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
- if ((opt == 'f') || (opt == 's')) {
- int t = bb_xgetularg10(optarg);
- if (opt == 'f') {
- skip_fields = t;
- } else {
- skip_chars = t;
+ output = argv[1];
+ if (output) {
+ if (argv[2])
+ bb_show_usage();
+ if (output[0] != '-' || output[1]) {
+ // Won't work with "uniq - FILE" and closed stdin:
+ //close(STDOUT_FILENO);
+ //xopen(output, O_WRONLY | O_CREAT | O_TRUNC);
+ xmove_fd(xopen(output, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
}
- } else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
- uniq_flags |= s0[4];
- } else {
- bb_show_usage();
}
}
- input_filename = *(argv += optind);
-
- in = xgetoptfile_uniq_s(argv, 0);
- if (*argv) {
- ++argv;
- }
- out = xgetoptfile_uniq_s(argv, 2);
- if (*argv && argv[1]) {
- bb_show_usage();
- }
-
- s1 = e1 = NULL; /* prime the pump */
+ cur_compare = cur_line = NULL; /* prime the pump */
do {
- s0 = s1;
- e0 = e1;
+ unsigned i;
+ unsigned long dups;
+ char *old_line;
+ const char *old_compare;
+
+ old_line = cur_line;
+ old_compare = cur_compare;
dups = 0;
/* gnu uniq ignores newlines */
- while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) {
- e1 = s1;
- for (i=skip_fields ; i ; i--) {
- e1 = skip_whitespace(e1);
- while (*e1 && !isspace(*e1)) {
- ++e1;
- }
+ while ((cur_line = xmalloc_fgetline(stdin)) != NULL) {
+ cur_compare = cur_line;
+ for (i = skip_fields; i; i--) {
+ cur_compare = skip_whitespace(cur_compare);
+ cur_compare = skip_non_whitespace(cur_compare);
}
- for (i = skip_chars ; *e1 && i ; i--) {
- ++e1;
+ for (i = skip_chars; *cur_compare && i; i--) {
+ ++cur_compare;
}
- if (!s0 || strcmp(e0, e1)) {
+ if (!old_line || strncmp(old_compare, cur_compare, max_chars)) {
break;
}
- ++dups; /* Note: Testing for overflow seems excessive. */
+ free(cur_line);
+ ++dups; /* testing for overflow seems excessive */
}
- if (s0) {
- if (!(uniq_flags & (2 << !!dups))) {
- bb_fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1);
- bb_fprintf(out, "%s\n", s0);
+ if (old_line) {
+ if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_u) */
+ if (opt & OPT_c) {
+ /* %7lu matches GNU coreutils 6.9 */
+ printf("%7lu ", dups + 1);
+ }
+ printf("%s\n", old_line);
}
- free((void *)s0);
+ free(old_line);
}
- } while (s1);
+ } while (cur_line);
- bb_xferror(in, input_filename);
+ die_if_ferror(stdin, input_filename);
- bb_fflush_stdout_and_exit(EXIT_SUCCESS);
+ fflush_stdout_and_exit(EXIT_SUCCESS);
}
projects / oweals / busybox.git / blobdiff