3 files changed, 3 insertions, 4 deletions
diff --git a/src/user/include/knob/block.h b/src/user/include/knob/block.h
index 27cb83b..5766245 100644
--- a/src/user/include/knob/block.h
+++ b/src/user/include/knob/block.h
@@ -16,6 +16,7 @@ uint32_t strcpy(char *to, const char *from);
 
 //allocates new memory
 char *strdup(const char *from);
+char *strndup(const char *from, uint32_t new_len);
 
 //without null-terminator
 uint32_t strlen(const char *str) __attribute__ ((pure));
diff --git a/src/user/include/knob/file.h b/src/user/include/knob/file.h
index 04fc201..f98a15c 100644
--- a/src/user/include/knob/file.h
+++ b/src/user/include/knob/file.h
@@ -10,13 +10,11 @@ extern "C" {
 
 struct file;
 
-const char *remove_prefix(const char *path, uint8_t *dn_out);
-
 struct file *open_file(const char *path);
 void close_file(struct file *f);
 
 uint32_t read_from_file(struct file *f, uint32_t max, void *buf);
-uint32_t write_to_file(struct file *f, uint32_t max, void *buf);
+uint32_t write_to_file(struct file *f, uint32_t max, const void *buf);
 //return value and max_length don't include null terminator
 uint32_t read_line_from_file(struct file *f, char *sz, uint32_t max_length);
 uint32_t seek_file_to(struct file *f, uint32_t to);
diff --git a/src/user/include/knob/heap.h b/src/user/include/knob/heap.h
index c0d7006..d7b0773 100644
--- a/src/user/include/knob/heap.h
+++ b/src/user/include/knob/heap.h
@@ -8,7 +8,7 @@ extern "C" {
 #include <stdint.h>
 
 void *get_block(uint32_t bytes) __attribute__ ((malloc));
-void free_block(void *block);
+void free_block(const void *block);
 
 #ifdef __cplusplus
 }