Add library function for the file permission formatting in ls and stat

2 files changed, 27 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 4d8e23a4..b89f2db8 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -1176,6 +1176,32 @@ barf:
   error_exit("bad mode '%s'", modestr);
 }
 
+// Format a mode for ls and stat
+void format_mode(char (*buf)[11], mode_t mode)
+{
+  char c, d;
+  int i, bit;
+
+  (*buf)[10]=0;
+  for (i=0; i<9; i++) {
+    bit = mode & (1<<i);
+    c = i%3;
+    if (!c && (mode & (1<<((d=i/3)+9)))) {
+      c = "tss"[d];
+      if (!bit) c &= ~0x20;
+    } else c = bit ? "xwr"[c] : '-';
+    (*buf)[9-i] = c;
+  }
+
+  if (S_ISDIR(mode)) c = 'd';
+  else if (S_ISBLK(mode)) c = 'b';
+  else if (S_ISCHR(mode)) c = 'c';
+  else if (S_ISLNK(mode)) c = 'l';
+  else if (S_ISFIFO(mode)) c = 'p';
+  else if (S_ISSOCK(mode)) c = 's';
+  else c = '-';
+  **buf = c;
+}
 
 char* make_human_readable(unsigned long long size, unsigned long unit)
 {
diff --git a/lib/lib.h b/lib/lib.h
index ab858f90..a4da031c 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -178,6 +178,7 @@ int sig_to_num(char *pidstr);
 char *num_to_sig(int sig);
 
 mode_t string_to_mode(char *mode_str, mode_t base);
+void format_mode(char (*buf)[11], mode_t mode);
 
 // password helper functions
 int read_password(char * buff, int buflen, char* mesg);