Merge branch 'master' into cel-41-port-over-a-basic-3d-scene-example

3 files changed, 23 insertions, 3 deletions

diff --git a/src/std/containers/ring_queue.c b/src/std/containers/ring_queue.c
index a9d3506..8bfc10b 100644
--- a/src/std/containers/ring_queue.c
+++ b/src/std/containers/ring_queue.c
@@ -1,5 +1,7 @@
 #include "ring_queue.h"
+
 #include <stdlib.h>
+#include <string.h>
 #include "defines.h"
 
 ring_queue* ring_queue_new(size_t type_size, size_t capacity, void* memory) {
diff --git a/src/std/str.c b/src/std/str.c
index 3b2770e..1c687fa 100644
--- a/src/std/str.c
+++ b/src/std/str.c
@@ -1,6 +1,6 @@
 #include "str.h"
+#include <assert.h>
 #include <string.h>
-
 #include "mem.h"
 
 str8 str8_create(u8* buf, size_t len) { return (str8){ .buf = buf, .len = len }; }
@@ -41,4 +41,22 @@ str8 str8_concat(arena* a, str8 left, str8 right) {
   dest[n_bytes - 1] = '\0';
 
   return str8_create(dest, n_bytes);
-}
\ No newline at end of file
+}
+
+str8 str8_substr(str8 s, u64 min, u64 max) {
+  assert(min >= 0);
+  assert(min < s.len);
+  assert(max >= 0);
+  assert(max <= s.len);
+  uint8_t* start = s.buf + (ptrdiff_t)min;
+  size_t new_len = max - min;
+  return (str8){ .buf = start, .len = new_len };
+}
+
+str8 str8_take(str8 s, u64 first_n) { return str8_substr(s, 0, first_n); }
+
+str8 str8_drop(str8 s, u64 last_n) { return str8_substr(s, s.len - last_n, s.len); }
+
+str8 str8_skip(str8 s, u64 n) { return str8_substr(s, n, s.len); }
+
+str8 str8_chop(str8 s, u64 n) { return str8_substr(s, 0, s.len - n); }
diff --git a/src/std/str.h b/src/std/str.h
index 9f96430..9d30cba 100644
--- a/src/std/str.h
+++ b/src/std/str.h
@@ -14,7 +14,7 @@
 #include "mem.h"
 
 /**
- * @brief Fat pointer representing a UTF8 encoded string
+ * @brief Fat pointer representing a UTF8 (TODO some APIs supporting utf8) encoded string
  * @note when using `printf` you must use %s.*s length, string until our own modified
          print routines are written. alternatively wrap in `cstr()` and pass to `%s`.
  */