Virtual filesystem and ramdiskfs

kernel/fs/path.c

@@ -0,0 +1,96 @@
+#include <fs/vfs.h>
+#include <libk/fieldsizeof.h>
+#include <libk/std.h>
+
+bool path_validate_char (char ch) {
+  return ((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
+          (ch == '_') || (ch == '_'));
+}
+
+bool path_validate (const char* path) {
+  if (path == NULL || *path == '\0')
+    return false;
+
+  const char* ptr = path;
+
+  if (*ptr == ':')
+    return false;
+
+  while (*ptr != ':' && *ptr != '\0') {
+    if (!path_validate_char (*ptr))
+      return false;
+
+    ptr++;
+  }
+
+  if (*ptr != ':')
+    return false;
+
+  ptr++;
+
+  if (*ptr != '/')
+    return false;
+
+  while (*ptr != '\0') {
+    if (*ptr == '/' && *(ptr + 1) == '/')
+      return false;
+
+    if (!path_validate_char (*ptr))
+      return false;
+
+    ptr++;
+  }
+
+  if (ptr > path && *(ptr - 1) == '/' && *(ptr - 2) != ':')
+    return false;
+
+  return true;
+}
+
+bool path_parse (const char* source, char* mountpoint, const char** path) {
+  if (source == NULL || mountpoint == NULL || path == NULL)
+    return false;
+
+  size_t i = 0;
+
+  while (source[i] != ':' && source[i] != '\0') {
+    if (i >= (fieldsizeof (struct vfs_mountpoint, key) - 1))
+      return false;
+
+    mountpoint[i] = source[i];
+    i++;
+  }
+
+  if (source[i] != ':' || i == 0)
+    return false;
+
+  mountpoint[i] = '\0';
+
+  const char* internal_path = &source[i + 1];
+
+  if (!path_validate (internal_path))
+    return false;
+
+  *path = internal_path;
+  return true;
+}
+
+const char* path_basename (const char* path) {
+  if (path == NULL)
+    return NULL;
+
+  const char* last_slash = NULL;
+  const char* ptr = path;
+
+  while (*ptr != '\0') {
+    if (*ptr == '/')
+      last_slash = ptr;
+
+    ptr++;
+  }
+
+  if (last_slash == NULL)
+    return path;
+
+  return last_slash + 1;
+}