Hi,
I found some questions on the internet wondering whether chmod tool does
support binary numbers as input.
Even though it doesn't support I downloaded core-utils source and got
started reading chmode code.
Let's to the point: I added binary input support by making changes
into the*/lib/modechanges.c
* file.
PS: (b) prefix is not case sensitive.
*Tests:*
./chmod* b10111* t* *
stat t (0027/----*-w-rwx*)
./chmod b t *(Error)*
./chmod: invalid mode: `b'
./chmod *b111111* t
stat t (0077/----*rwxrwx*)
Octal mode fulfills its goal very well, though Binary mode may be an
interesting feature.
Follows the changes:
--- modechange.c~ 2012-11-24 00:03:36.000000000 -0200
+++ modechange.c 2012-11-23 23:54:45.000000000 -0200
@@ -137,6 +137,31 @@
struct mode_change *mc;
size_t used = 0;
+ if (*mode_string == 'b' || *mode_string == 'B')
+ {
+ unsigned int binary_mode = 0;
+ mode_t mode;
+ mode_t mentioned;
+
+ // Jumps the b character
+ mode_string++;
+ do
+ {
+ binary_mode = (binary_mode << 1) + *mode_string++ - '0';
+ if (ALLM < binary_mode)
+ return NULL;
+ }
+ while ('0' <= *mode_string && *mode_string <= '1');
+
+ if (*mode_string)
+ return NULL;
+
+ // Octal_to_mode function will fit the binary mode.
+ mode = octal_to_mode (binary_mode);
+ mentioned = (mode & (S_ISUID | S_ISGID)) | S_ISVTX | S_IRWXUGO;
+ return make_node_op_equals (mode, mentioned);
+ }
+
if ('0' <= *mode_string && *mode_string < '8')
{
unsigned int octal_mode = 0;
I would like to receive any feedback on the matter.
Regards,*
Raphael S.Carvalho *
Blog: http://raphaelscarvalho.blogspot.com.br/
Github: https://github.com/raphaelsc
