tools: add blkdumpb

tools/.gitignore

@@ -1,3 +1,4 @@
 *.o
 /memdumpb
+/blkdumpb
 /uploadb

tools/Makefile

@@ -1,8 +1,10 @@
 MEMDUMP_TGT = memdumpb
 MEMDUMP_SRC = memdump.c
+BLKDUMP_TGT = blkdumpb
+BLKDUMP_SRC = blkdump.c
 UPLOAD_TGT = uploadb
 UPLOAD_SRC = upload.c
-TARGETS = $(MEMDUMP_TGT) $(UPLOAD_TGT)
+TARGETS = $(MEMDUMP_TGT) $(BLKDUMP_TGT) $(UPLOAD_TGT)
 OBJS = common.o
 
 all: $(TARGETS)
@@ -14,6 +16,9 @@ all: $(TARGETS)
 $(MEMDUMP_TGT): $(MEMDUMP_SRC) $(OBJS)
 	$(CC) $(CFLAGS) $(MEMDUMP_SRC) $(OBJS) -o $@
 
+$(BLKDUMP_TGT): $(BLKDUMP_SRC) $(OBJS)
+	$(CC) $(CFLAGS) $(BLKDUMP_SRC) $(OBJS) -o $@
+
 $(UPLOAD_TGT): $(UPLOAD_SRC) $(OBJS)
 	$(CC) $(CFLAGS) $(UPLOAD_SRC) $(OBJS) -o $@
 

tools/blkdump.c

@@ -0,0 +1,37 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "common.h"
+
+/* Read specified number of bytes in active blkdev at active offset.
+ */
+
+int main(int argc, char **argv)
+{
+    if (argc != 3) {
+        fprintf(stderr, "Usage: ./memdump device bytecount\n");
+        return 1;
+    }
+    unsigned int bytecount = strtol(argv[2], NULL, 16);
+    if (!bytecount) {
+        // nothing to spit
+        return 0;
+    }
+
+    int fd = open(argv[1], O_RDWR|O_NOCTTY);
+    char s[3];
+    for (int i=0; i<bytecount; i++) {
+        sendcmd(fd, "getb");
+        read(fd, s, 2); // read prompt
+        sendcmd(fd, "puth a");
+        read(fd, s, 2); // read hex pair
+        s[2] = 0; // null terminate
+        unsigned char c = strtol(s, NULL, 16);
+        putchar(c);
+        read(fd, s, 2); // read prompt
+    }
+    return 0;
+}
+