str copy (w/ zero size) fix

Author: glouw

ctl/str.h

@@ -15,8 +15,10 @@
 #define str_init str___INIT
 #define str_equal str___EQUAL
 #define str_find str___FIND
+#define str_copy str___COPY
 #include <vec.h>
 #undef str_init
+#undef str_copy
 #undef str_equal
 #undef str_find
 #undef vec_char
@@ -46,6 +48,14 @@ str_append(str* self, const char* s)
         self->value[start + i] = s[i];
 }
 
+static inline str
+str_copy(str* s)
+{
+    str other = str_init("");
+    str_append(&other, s->value);
+    return other;
+}
+
 static inline void
 str_insert_str(str* self, size_t index, const char* s)
 {

tests/func/test_str.cc

@@ -52,12 +52,28 @@ char_compare(char* a, char* b)
     return *a > *b;
 }
 
+static void
+test_zero_size_copy(void)
+{
+    str a = str_init("");
+    str b = str_copy(&a);
+    std::string aa = "";
+    std::string bb = aa;
+    assert(aa.size() == a.size);
+    assert(bb.size() == b.size);
+    assert(aa.capacity() == a.capacity);
+    assert(bb.capacity() == b.capacity);
+    str_free(&a);
+    str_free(&b);
+}
+
 int
 main(void)
 {
 #ifdef SRAND
     srand(time(NULL));
 #endif
+    test_zero_size_copy();
     const size_t loops = TEST_RAND(TEST_MAX_LOOPS);
     for(size_t loop = 0; loop < loops; loop++)
     {