1 files changed, 102 insertions, 0 deletions
diff --git a/coreutils/uniq.c b/coreutils/uniq.c
new file mode 100644
index 0000000..0918621
--- /dev/null
+++ b/coreutils/uniq.c
@@ -0,0 +1,102 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * uniq implementation for busybox
+ *
+ * Copyright (C) 2005  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
+
+#include "libbb.h"
+
+static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
+{
+	const char *n;
+
+	n = *argv;
+	if (n != NULL) {
+		if ((*n != '-') || n[1]) {
+			return xfopen(n, "r\0w" + read0write2);
+		}
+	}
+	return (read0write2) ? stdout : stdin;
+}
+
+int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int uniq_main(int argc UNUSED_PARAM, char **argv)
+{
+	FILE *in, *out;
+	const char *s0, *e0, *s1, *e1, *input_filename;
+	unsigned long dups;
+	unsigned skip_fields, skip_chars, max_chars;
+	unsigned opt;
+	unsigned i;
+
+	enum {
+		OPT_c = 0x1,
+		OPT_d = 0x2,
+		OPT_u = 0x4,
+		OPT_f = 0x8,
+		OPT_s = 0x10,
+		OPT_w = 0x20,
+	};
+
+	skip_fields = skip_chars = 0;
+	max_chars = -1;
+
+	opt_complementary = "f+:s+:w+";
+	opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars);
+	argv += optind;
+
+	input_filename = *argv;
+
+	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 */
+
+	do {
+		s0 = s1;
+		e0 = e1;
+		dups = 0;
+
+		/* gnu uniq ignores newlines */
+		while ((s1 = xmalloc_fgetline(in)) != NULL) {
+			e1 = s1;
+			for (i = skip_fields; i; i--) {
+				e1 = skip_whitespace(e1);
+				e1 = skip_non_whitespace(e1);
+			}
+			for (i = skip_chars; *e1 && i; i--) {
+				++e1;
+			}
+
+			if (!s0 || strncmp(e0, e1, max_chars)) {
+				break;
+			}
+
+			++dups;	 /* note: testing for overflow seems excessive. */
+		}
+
+		if (s0) {
+			if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_e) */
+				fprintf(out, "\0%ld " + (opt & 1), dups + 1); /* 1 == OPT_c */
+				fprintf(out, "%s\n", s0);
+			}
+			free((void *)s0);
+		}
+	} while (s1);
+
+	die_if_ferror(in, input_filename);
+
+	fflush_stdout_and_exit(EXIT_SUCCESS);
+}