3 files changed, 49 insertions, 0 deletions
diff --git a/src/user/dirlist/main.c b/src/user/dirlist/main.c
new file mode 100644
index 0000000..64f0ddb
--- /dev/null
+++ b/src/user/dirlist/main.c
@@ -0,0 +1,27 @@
+#include <libterm/terminal.h>
+#include <knob/block.h>
+#include <knob/file.h>
+
+#define MAX_NAME_LEN 15
+#define COLUMN_SEP " - "
+
+void main(const char *path) {
+  uint32_t count;
+  _dir_info_entry_t *entries = get_directory_info(path, &count);
+  if (!entries) {
+    term_addf("Could not list %s\n", path);
+    return;
+  }
+  term_addf("Directory listing for %s:\n\n", *path ? path : "(root)");
+  if (!count) {
+    term_add_sz("(empty)\n");
+    return;
+  }
+  for (_dir_info_entry_t *i = entries; i < entries + count; ++i) {
+    str_trunc_fill(i->name, MAX_NAME_LEN);
+    if (i->is_dir)
+      term_addf_no_ww("%s" COLUMN_SEP "directory\n", i->name);
+    else
+      term_addf_no_ww("%s" COLUMN_SEP "%u bytes\n", i->name, i->size);
+  }
+}
+\ No newline at end of file
diff --git a/src/user/include/knob/block.h b/src/user/include/knob/block.h
index f77709d..1231a6d 100644
--- a/src/user/include/knob/block.h
+++ b/src/user/include/knob/block.h
@@ -18,4 +18,10 @@ uint32_t strlen(const char *str) __attribute__ ((pure));
 
 bool strequ(const char *a, const char *b) __attribute__ ((pure));
 
+//if str has length == len, nothing is done
+//if str has length  < len, it is right-padded with spaces
+//if str has length  > len, the end is replaced with " ..."
+//this replacement happens in place, with no memory allocation
+void str_trunc_fill(char *str, uint32_t len);
+
 #endif
 \ No newline at end of file
diff --git a/src/user/knob/block.c b/src/user/knob/block.c
index 90f79e3..1720f94 100644
--- a/src/user/knob/block.c
+++ b/src/user/knob/block.c
@@ -57,4 +57,20 @@ uint32_t strlen(const char *str) {
     ++str;
   }
   return len;
+}
+
+void str_trunc_fill(char *str, uint32_t len) {
+  const uint8_t orig_len = strlen(str);
+  if (orig_len > len) {
+    str[len - 4] = ' ';
+    str[len - 3] = '.';
+    str[len - 2] = '.';
+    str[len - 1] = '.';
+    str[len] = '\0';
+  }
+  else if (orig_len != len) {
+    for (uint8_t j = orig_len; j < len; ++j)
+      str[j] = ' ';
+    str[len] = '\0';
+  }
 }
 \ No newline at end of file