Set minimum capacity for arena

dstr/include/dstr.h

@@ -10,8 +10,8 @@ extern "C" {
 
 typedef struct dstr String;
 
-String *wapp_dstr_with_capacity(u64 capacity, Allocator *allocator);
+String *wapp_dstr_with_capacity(u64 capacity, const Allocator *allocator);
-String *wapp_dstr_from_string(const char *str, Allocator *allocator);
+String *wapp_dstr_from_string(const char *str, const Allocator *allocator);
 void wapp_dstr_update(String **dst, const char *src);
 void wapp_dstr_free(String **str);
 void wapp_dstr_concat(String **dst, const char *src);

dstr/src/dstr.c

@@ -17,7 +17,7 @@ struct dstr {
   char buf[];
 };
 
-String *wapp_dstr_with_capacity(u64 capacity, Allocator *allocator) {
+String *wapp_dstr_with_capacity(u64 capacity, const Allocator *allocator) {
   Allocator alloc;
   if (allocator) {
     alloc = *allocator;
@@ -38,7 +38,7 @@ String *wapp_dstr_with_capacity(u64 capacity, Allocator *allocator) {
   return out;
 }
 
-String *wapp_dstr_from_string(const char *str, Allocator *allocator) {
+String *wapp_dstr_from_string(const char *str, const Allocator *allocator) {
   if (!str) {
     return NULL;
   }
@@ -182,9 +182,6 @@ i64 wapp_dstr_find(const String *str, const char *substr) {
     return -1;
   }
 
-  char buf[substr_length + 1];
-  memset(buf, 0, substr_length + 1);
-
   const char *s1;
   for (u64 i = 0; i < str->size; ++i) {
     if (i + substr_length > str->size) {

mem/src/arena/mem_arena.c

@@ -18,6 +18,8 @@
   { 0x57, 0x41, 0x41, 0x52, 0x4e, 0x48, 0x44, 0x52 }
 #define MAX_HDR_SEARCH_LENGTH 256
 
+#define ARENA_MINIMUM_CAPACITY 1024
+
 typedef struct arena_alloc_hdr ArenaAllocHDR;
 struct arena_alloc_hdr {
   u8 magic[HDR_MAGIC_BYTE_COUNT];
@@ -282,12 +284,15 @@ internal bool base_arena_init(BaseArena *arena, u64 capacity) {
     return false;
   }
 
-  arena->buf = (u8 *)calloc(capacity, sizeof(u8));
+  u64 arena_capacity =
+      capacity >= ARENA_MINIMUM_CAPACITY ? capacity : ARENA_MINIMUM_CAPACITY;
+
+  arena->buf = (u8 *)calloc(arena_capacity, sizeof(u8));
   if (!(arena->buf)) {
     return false;
   }
 
-  arena->capacity = capacity;
+  arena->capacity = arena_capacity;
   arena->offset = arena->buf;
   arena->prev = arena->next = NULL;