1 files changed, 72 insertions, 0 deletions
diff --git a/bootblocks/dosboot.c b/bootblocks/dosboot.c
new file mode 100644
index 0000000..72b8d25
--- /dev/null
+++ b/bootblocks/dosboot.c
@@ -0,0 +1,72 @@
+
+#include <stdio.h>
+
+#include "sysboot.v"
+#include "msdos.v"
+#include "skip.v"
+
+char buffer[512];
+
+struct bblist {
+   char * name;
+   char * data;
+   char * desc;
+} bblocks[] = {
+   { "bare",  sysboot_data,	"Bare bootblock, lockup if booted"   },
+   { "dosfs", msdos_data,	"Boots file BOOTFILE.SYS from dosfs" },
+   { "skip",  skip_data,	"Bypasses floppy boot with message"  },
+   0
+};
+
+char * progname = "";
+
+main(argc, argv)
+int argc;
+char ** argv;
+{
+   FILE * fd;
+   struct bblist *ptr = bblocks;
+   int i;
+
+   progname = argv[0];
+
+   if( argc != 3 ) Usage();
+
+   for(;ptr->name; ptr++) if( strcmp(argv[1], ptr->name) == 0 ) break;
+   if( ptr->name == 0 ) Usage();
+
+   fd = fopen(argv[2], "r+");
+   if( fd == 0 )
+   {
+      fprintf(stderr, "Cannot open %s\n", argv[2]);
+      exit(1);
+   }
+   if( fread(buffer, 512, 1, fd) != 1 )
+   {
+      fprintf(stderr, "Cannot read boot block\n");
+      exit(1);
+   }
+   for(i=0; i<sysboot_dosfs_stat; i++)
+      buffer[i] = ptr->data[i];
+   for(i=sysboot_codestart; i<512; i++)
+      buffer[i] = ptr->data[i];
+
+   rewind(fd);
+   if( fwrite(buffer, 512, 1, fd) != 1 )
+   {
+      fprintf(stderr, "Cannot write boot block\n");
+      exit(1);
+   }
+   fclose(fd);
+}
+
+Usage()
+{
+   struct bblist *ptr = bblocks;
+
+   fprintf(stderr, "Usage: %s bootname /dev/fd0\n", progname);
+   fprintf(stderr, "Blocks\n");
+   for(;ptr->name; ptr++)
+       fprintf(stderr, "\t%s\t%s\n", ptr->name, ptr->desc);
+   exit(1);
+}