update

djstdlib/core.cpp

@@ -1,11 +1,20 @@
+#include "os.cpp"
 #include <math.h>
 #include <string.h>
-#include <unistd.h>
 #include "core.h"
-#include "os.cpp"
 #define STB_SPRINTF_IMPLEMENTATION
 #include "vendor/stb_sprintf.h"
 
+void *pushSizeFill(Arena *arena, size_t bytes, byte fill) {
+    if (arena->capacity - arena->head >= bytes) {
+        void *ptr = (char *)arena->memory + arena->head;
+        arena->head += bytes;
+        memset(ptr, fill, bytes);
+        return ptr;
+    }
+    return 0;
+}
+
 void *pushSize(Arena *arena, size_t bytes) {
     if (arena->capacity - arena->head >= bytes) {
         void *ptr = (char *)arena->memory + arena->head;
@@ -112,6 +121,18 @@ const char *cstring(Arena *arena, string str) {
     return arr;
 }
 
+bool strStartsWith(string str, string testStr) {
+    if (str.length < testStr.length) {
+        return false;
+    }
+    for (size_t i = 0; i < testStr.length; i++) {
+        if (str.str[i] != testStr.str[i]) {
+            return false;
+        }
+    }
+    return true;
+}
+
 bool strEql(string s1, string s2) {
     if (s1.length != s2.length) {
         return false;

djstdlib/core.h

@@ -57,6 +57,7 @@ struct Scratch {
 };
 
 void *pushSize(Arena *arena, size_t bytes);
+void *pushSizeFill(Arena *arena, size_t bytes, byte fill);
 Arena *arenaAlloc(size_t capacity);
 void arenaFree(Arena *arena);
 void arenaFreeFrom(Arena *arena, size_t pos);
@@ -68,7 +69,9 @@ Scratch scratchStart(Arena **conflicts, size_t conflictCount);
 void scratchEnd(Scratch scratch); 
 
 #define PushArray(arena, type, size) (type *)pushSize(arena, sizeof(type) * (size))
+#define PushArrayZero(arena, type, size) (type *)pushSizeFill(arena, sizeof(type) * (size), 0)
 #define PushStruct(arena, type) (type *)pushSize(arena, sizeof(type))
+#define PushStructZero(arena, type) (type *)pushSizeFill(arena, sizeof(type), 0)
 
 // ### Vectors ###
 template <typename T>
@@ -134,7 +137,9 @@ struct list {
 };
 
 #define PushList(arena, type, size) (list<type>{ PushArray(arena, type, size), size, 0 })
+#define PushListZero(arena, type, size) (list<type>{ PushArrayZero(arena, type, size), size, 0 })
 #define PushFullList(arena, type, size) (list<type>{ PushArray(arena, type, size), size, size })
+#define PushFullListZero(arena, type, size) (list<type>{ PushArrayZero(arena, type, size), size, size })
 
 template <typename T> T *appendList(list<T> *list, T element); 
 template <typename T> void zeroList(list<T> *list); 
@@ -151,6 +156,7 @@ struct string {
 
 #define strlit(lit) (string{(char *)(lit), sizeof(lit) - 1})
 #define PushString(arena, length) (string{ (char *)pushSize(arena, length), (length) })
+#define PushStringFill(arena, length, characterByte) (string{ (char *)pushSizeFill(arena, length, characterByte), (length) })
 string operator""_s(const char *cstrLiteral, size_t length);
 
 // C Strings
@@ -160,6 +166,7 @@ size_t calcStringLen(const char *str);
 string strFromCString(Arena *arena, const char *str); 
 
 bool strEql(string s1, string s2); 
+bool strStartsWith(string str, string testStr);
 bool stringContains(string str, char c); 
 
 string strReverse(Arena *arena, string str); 

djstdlib/os_linux.cpp

@@ -5,6 +5,7 @@
 
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <unistd.h>
 
 void *os_alloc(size_t capacity) {
     return mmap(0, capacity, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

djstdlib/os_win32.cpp

@@ -1,8 +1,8 @@
 #ifndef OS_IMPL_WIN32_CPP
 #define OS_IMPL_WIN32_CPP
 
-#include "os.h"
 #include "Windows.h" 
+#include "os.h"
 
 void *os_alloc(size_t commitSize) {
     return VirtualAlloc(NULL, commitSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);