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Diffstat (limited to 'i/pc104/initrd/conf/busybox/coreutils/comm.c')
-rw-r--r--i/pc104/initrd/conf/busybox/coreutils/comm.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/coreutils/comm.c b/i/pc104/initrd/conf/busybox/coreutils/comm.c
new file mode 100644
index 0000000..b641296
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/coreutils/comm.c
@@ -0,0 +1,127 @@
+/* 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);
+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);
+}