Add support for memory "fill" mode

Syntax: write <memtype> <start addr> <no. byte to write> <byte to write> ...

src/term.c

@@ -336,11 +336,13 @@ static int cmd_write(PROGRAMMER * pgm, struct avrpart * p,
   unsigned char b;
   int rc;
   int werror;
+  int write_mode;
   AVRMEM * mem;
 
   if (argc < 4) {
-    avrdude_message(MSG_INFO, "Usage: write <memtype> <addr> <byte1> "
+    avrdude_message(MSG_INFO,
-            "<byte2> ... <byteN>\n");
+      "Usage: write <memtype> <start addr> <data1> <data2> <dataN>\n"
+      "       write <memtype> <start addr> <no. bytes> <data1> <dataN> <...>\n");
     return -1;
   }
 
@@ -368,8 +370,19 @@ static int cmd_write(PROGRAMMER * pgm, struct avrpart * p,
     return -1;
   }
 
-  /* number of bytes to write at the specified address */
+  // Figure out how many bytes to write to memory
+  if(strcmp(argv[5], "...") == 0) {
+    write_mode = WRITE_MODE_FILL;
+    len = strtoul(argv[3], &e, 0);
+    if (*e || (e == argv[3])) {
+      avrdude_message(MSG_INFO, "%s (write ...): can't parse address \"%s\"\n",
+            progname, argv[3]);
+      return -1;
+    }
+  } else {
+    write_mode = WRITE_MODE_STANDARD;
     len = argc - 3;
+  }
 
   if ((addr + len) > maxsize) {
     avrdude_message(MSG_INFO, "%s (write): selected address and # bytes exceed "
@@ -384,6 +397,7 @@ static int cmd_write(PROGRAMMER * pgm, struct avrpart * p,
     return -1;
   }
 
+  if(write_mode == WRITE_MODE_STANDARD) {
     for (i=3; i<argc; i++) {
       buf[i-3] = strtoul(argv[i], &e, 0);
       if (*e || (e == argv[i])) {
@@ -393,6 +407,18 @@ static int cmd_write(PROGRAMMER * pgm, struct avrpart * p,
         return -1;
       }
     }
+  } else if(write_mode == WRITE_MODE_FILL) {
+    unsigned char fill_val = strtoul(argv[4], &e, 0);
+    if (*e || (e == argv[4])) {
+        avrdude_message(MSG_INFO, "%s (write ...): can't parse byte \"%s\"\n",
+                progname, argv[4]);
+        free(buf);
+        return -1;
+    }
+    for (i = 0; i < len; i++) {
+      buf[i] = fill_val;
+    }
+  }
 
   pgm->err_led(pgm, OFF);
   for (werror=0, i=0; i<len; i++) {

src/term.h

@@ -27,6 +27,10 @@
 extern "C" {
 #endif
 
+// Macros for determining write mode
+#define WRITE_MODE_STANDARD 0
+#define WRITE_MODE_FILL     1
+
 int terminal_mode(PROGRAMMER * pgm, struct avrpart * p);
 char * terminal_get_input(const char *prompt);