add feature ：dump dtb files

[toneywoo]

dump dtb files from image

[7Ji]

Sorry but I would not pull the current commit:

1. This builds with warning, please fix them:

   cc -c -o obj/dtb.o src/dtb.c -Iinclude -Wall -Wextra
   src/dtb.c: In function 'dtb_read_into_buffer_helper':
   src/dtb.c:547:22: warning: comparison of integer expressions of different signedness: 'int' and 'uint32_t' {aka 'unsigned int'} [-Wsign-compare]
   547 |         for(int i=0;i<mhelper.entry_count;i++){
       |                      ^
   src/dtb.c:563:21: warning: unused variable 're' [-Wunused-variable]
   563 |             ssize_t re = write(fdtb,mhelper.entries[i].dtb,mhelper.entries[i].size);
       |                     ^~
   

2. Why do you initialize a string or char array like this?

   char sname[256] = {""};
   

   If you consider it a string, initialize it with ""; if you consider it a char array, initialize it with {0}
3. The stdout is dedicated for snapshot output in dsnapshot, esnapshot and webreport mode, please don't use it for log
4. Why did you open file as fdtb then check the fd?
5. Why do you set the return value as re and does not do any check on it? If you're not gonna perform any checks then don't even set it.
6. Why are there commentted codes?
7. Please leave a space between variable, operator and operands. Keeping them as compact as this makes them very hard to read and follow.
8. You shouldn't introduce the logic to this part unconditionally, either. At least add a new flag and let the user define the output folder.

[7Ji]

Close as no new commit requested after 2 weeks