Added cmp and readlink applets from Matt Kraai.

coreutils/cmp.c

@@ -0,0 +1,65 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini cmp implementation for busybox
+ *
+ *
+ * Copyright (C) 2000 by Lineo, inc.
+ * Written by Matt Kraai <kraai@alumni.carnegiemellon.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include "busybox.h"
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+int cmp_main(int argc, char **argv)
+{
+	FILE *fp1 = NULL, *fp2 = stdin;
+	char *filename1 = argv[1], *filename2 = "-";
+	int c1, c2, char_pos = 1, line_pos = 1;
+
+	/* parse argv[] */
+	if (argc < 2 || 3 < argc)
+		usage(cmp_usage);
+
+	fp1 = xfopen(argv[1], "r");
+	if (argv[2] != NULL) {
+		fp2 = xfopen(argv[2], "r");
+		filename2 = argv[2];
+	}
+
+	do {
+		c1 = fgetc(fp1);
+		c2 = fgetc(fp2);
+		if (c1 != c2) {
+			if (c1 == EOF)
+				printf("EOF on %s\n", filename1);
+			else if (c2 == EOF)
+				printf("EOF on %s\n", filename2);
+			else
+				printf("%s %s differ: char %d, line %d\n", filename1, filename2,
+						char_pos, line_pos);
+			return 1;
+		}
+		char_pos++;
+		if (c1 == '\n')
+			line_pos++;
+	} while (c1 != EOF);
+
+	return EXIT_SUCCESS;
+}