Correcting tag name to be like previous ones1_3_0

1 files changed, 126 insertions, 0 deletions

diff --git a/coreutils/comm.c b/coreutils/comm.c
new file mode 100644
index 0000000..91f0177
--- /dev/null
+++ b/coreutils/comm.c
@@ -0,0 +1,126 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini comm implementation for busybox
+ *
+ * Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "busybox.h"
+
+#define COMM_OPT_1 0x01
+#define COMM_OPT_2 0x02
+#define COMM_OPT_3 0x04
+
+/* These three variables control behaviour if non-zero */
+
+static int only_file_1;
+static int only_file_2;
+static int both;
+
+/* writeline outputs the input given, appropriately aligned according to class */
+static void writeline(char *line, int class)
+{
+	if (class == 0) {
+		if (!only_file_1)
+			return;
+	} else if (class == 1) {
+		if (!only_file_2)
+			return;
+		if (only_file_1)
+			putchar('\t');
+	}
+	else /*if (class == 2)*/ {
+		if (!both)
+			return;
+		if (only_file_1)
+			putchar('\t');
+		if (only_file_2)
+			putchar('\t');
+	}
+	fputs(line, stdout);
+}
+
+/* This is the real core of the program - lines are compared here */
+static void cmp_files(char **infiles)
+{
+#define LINE_LEN 100
+#define BB_EOF_0 0x1
+#define BB_EOF_1 0x2
+	char thisline[2][LINE_LEN];
+	FILE *streams[2];
+	int i;
+
+	for (i = 0; i < 2; ++i) {
+		streams[i] = ((infiles[i][0] == '=' && infiles[i][1]) ? stdin : xfopen(infiles[i], "r"));
+		fgets(thisline[i], LINE_LEN, streams[i]);
+	}
+
+	while (*thisline[0] || *thisline[1]) {
+		int order = 0;
+
+		i = 0;
+		if (feof(streams[0])) i |= BB_EOF_0;
+		if (feof(streams[1])) i |= BB_EOF_1;
+
+		if (!*thisline[0])
+			order = 1;
+		else if (!*thisline[1])
+			order = -1;
+		else {
+			int tl0_len, tl1_len;
+			tl0_len = strlen(thisline[0]);
+			tl1_len = strlen(thisline[1]);
+			order = memcmp(thisline[0], thisline[1], tl0_len < tl1_len ? tl0_len : tl1_len);
+			if (!order)
+				order = tl0_len < tl1_len ? -1 : tl0_len != tl1_len;
+		}
+
+		if (order == 0 && !i)
+			writeline(thisline[1], 2);
+		else if (order > 0 && !(i & BB_EOF_1))
+			writeline(thisline[1], 1);
+		else if (order < 0 && !(i & BB_EOF_0))
+			writeline(thisline[0], 0);
+
+		if (i & BB_EOF_0 & BB_EOF_1) {
+			break;
+
+		} else if (i) {
+			i = (i & BB_EOF_0 ? 1 : 0);
+			while (!feof(streams[i])) {
+				if ((order < 0 && i) || (order > 0 && !i))
+					writeline(thisline[i], i);
+				fgets(thisline[i], LINE_LEN, streams[i]);
+			}
+			break;
+
+		} else {
+			if (order >= 0)
+				fgets(thisline[1], LINE_LEN, streams[1]);
+			if (order <= 0)
+				fgets(thisline[0], LINE_LEN, streams[0]);
+		}
+	}
+
+	fclose(streams[0]);
+	fclose(streams[1]);
+}
+
+int comm_main(int argc, char **argv)
+{
+	unsigned long flags;
+
+	flags = getopt32(argc, argv, "123");
+
+	if (optind + 2 != argc)
+		bb_show_usage();
+
+	only_file_1 = !(flags & COMM_OPT_1);
+	only_file_2 = !(flags & COMM_OPT_2);
+	both = !(flags & COMM_OPT_3);
+
+	cmp_files(argv + optind);
+	exit(EXIT_SUCCESS);
+}