From 20f9d23538811dde9ce8aea051408a05e178b6d4 Mon Sep 17 00:00:00 2001
From: Andrew Opalach <andrew@akon.city>
Date: Tue, 25 Aug 2026 19:25:56 -0400
Subject: str: al_str_null() -> AL_STR_EMPTY

Signed-off-by: Andrew Opalach <andrew@akon.city>
---
 include/al/str.h |  5 +++--
 tests/str.c      | 13 +++++++------
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/include/al/str.h b/include/al/str.h
index a572dec..e993cce 100644
--- a/include/al/str.h
+++ b/include/al/str.h
@@ -11,7 +11,7 @@ typedef struct {
 
 #define AL_STR_NO_POS ((u32)-1)
 
-#define al_str_null() ((str){ 0, 0, NULL })
+#define AL_STR_EMPTY ((str){ 0, 0, NULL })
 
 #define al_str_at(s, index) (s)->data[index]
 #define al_str_atr(s, index) (s)->data[(s)->length - (index)]
@@ -43,7 +43,7 @@ static inline u32 al_str_reserve(str *s, u32 size)
 
 static inline void al_str_sized(str *s, u32 size)
 {
-    *s = al_str_null();
+    *s = AL_STR_EMPTY;
     s->alloc = al_str_reserve(s, size);
 }
 
@@ -88,6 +88,7 @@ static inline char *al_str_to_c_str(str *s)
 
 static inline void al_str_cat(str *s, str *c)
 {
+    al_assert(c->data && c->length > 0);
     s->alloc = al_str_reserve(s, s->length + c->length);
     al_memcpy(s->data + s->length, c->data, c->length);
     s->length += c->length;
diff --git a/tests/str.c b/tests/str.c
index 933b1f9..2b02297 100644
--- a/tests/str.c
+++ b/tests/str.c
@@ -47,10 +47,11 @@ static bool str_test_cat(void)
 
     str result = al_str_c("hygshiylitf");
 
-    str string0;
-    al_str_from(&string0, "hyg");
+    str string0 = AL_STR_EMPTY;
+    al_str_cat(&string0, &al_str_c("hyg"));
 
     AL_TEST_EQ(string0.length, 3, u32);
+    AL_TEST_GTE(string0.alloc, 3, u32);
 
     al_str_cat(&string0, &al_str_c("shiylitf"));
 
@@ -167,7 +168,7 @@ static bool str_test_get_line(void)
 
     for (u32 i = 0; i < ARRAY_SIZE(strings); i++) {
         u32 counter = 0;
-        str line = al_str_null();
+        str line = AL_STR_EMPTY;
         for (; al_str_get_line(&strings[i], '\n', &line); ) {
             AL_TEST_LT(counter, sizes[i], u32);
             AL_TEST_TRUE(al_str_eq(&line, &arrays[i][counter++]));
@@ -176,7 +177,7 @@ static bool str_test_get_line(void)
         AL_TEST_EQ(counter, sizes[i], u32);
 
         counter = 0;
-        line = al_str_null();
+        line = AL_STR_EMPTY;
         // One empty line.
         for (; al_str_get_line(&al_str_c("\n"), '\n', &line); ) {
             AL_TEST_LT(counter, 1, u32);
@@ -185,7 +186,7 @@ static bool str_test_get_line(void)
         }
 
         // No lines.
-        line = al_str_null();
+        line = AL_STR_EMPTY;
         AL_TEST_FALSE(al_str_get_line(&al_str_c(""), '\n', &line));
     }
 
@@ -337,7 +338,7 @@ static bool str_test_limits(void)
 {
     AL_TEST_START("str_limits");
 
-    str s = al_str_null();
+    str s = AL_STR_EMPTY;
 
     for (u32 i = 0; i < MAX_ALLOC_32 - 1; i++) {
         al_str_cat(&s, &al_str_c("y"));
-- 
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