Add new file comparing two file byte by byte and display the difference.

1 files changed, 60 insertions, 0 deletions

diff --git a/server/mdiff.c b/server/mdiff.c
new file mode 100644
index 0000000..6c73d21
--- /dev/null
+++ b/server/mdiff.c
@@ -0,0 +1,60 @@
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <ctype.h>
+
+int 
+main(int argc, char **argv)
+{
+	int fd0, fd1;
+	int l0, l1, c;
+	char c0, c1;
+
+	if (argc < 2) {
+		printf("usage\n");
+		exit(1);
+	}
+
+	
+	if ((fd0 = open(argv[1], O_RDONLY)) < 0 ) {
+		printf("Cannot open %s\n", argv[1]);
+		return(-1);
+	}
+	if ((fd1 = open(argv[2], O_RDONLY)) < 0 ) {
+		printf("Cannot open %s\n", argv[2]);
+		return(-1);
+	}
+
+	l0 = l1 =  0;
+	l0 = read(fd0, &c0, 1);
+	l1 = read(fd1, &c1, 1);
+	c = l0;
+	while (l0 > 0) {
+		if (c0 != c1) {
+			if (isprint(c0) && isprint(c1))
+				printf("diff at 0x%x: 0x%x (%c) != 0x%x (%c)\n", 
+					c,c0,c0, c1,c1);
+			else if (isprint(c0) && !isprint(c1))
+				printf("diff at 0x%x: 0x%x (%c)\n", 
+					c,c0,c0);
+			else if (!isprint(c0) && isprint(c1))
+				printf("diff at 0x%x:             0x%x (%c)\n", 
+					c,c1,c1);
+			else
+				printf("diff at 0x%x\n", c);
+		}
+		l0 = read(fd0, &c0, 1);
+		l1 = read(fd1, &c1, 1);
+		c += l0;
+		c += l0;
+	}
+
+	close(fd0);
+	close(fd1);
+	
+	return(0);
+}
+