move example code to .h file

test/plex.c

@@ -1,66 +1,5 @@
 
-#include <stdio.h>
-#include <string.h>
-
-typedef struct arena_s Arena;
-struct arena_s {
-	unsigned char *tape;
-	unsigned int count;
-	unsigned int capacity;
-};
-
-void *aalloc(Arena *arena, unsigned int size){
-    unsigned int pos;
-	if(arena == NULL) return NULL;
-	if(arena->count + size > arena->capacity) return NULL;
-
-	pos = arena->count;
-	arena->count += size;
-	return (void *)&arena->tape[pos];
-}
-
-unsigned int
-scpy(char *to, const char *from, unsigned int length)
-{
-	unsigned int i;
-	if(to == NULL || from == NULL) return -1;
-	if(length == 0) return 0;
-	for(i = 0; i < length - 1 && from[i] != '\0'; i++) to[i] = from[i];
-	to[i] = '\0';
-	return 0;
-}
-
-char *
-ascpy(Arena *arena, const char *start, unsigned int length)
-{
-	char *str;
-	if(!start) return NULL;
-	str = (char *)aalloc(arena, length + 1);
-	if(!str) return NULL;
-	scpy(str, start, length);
-	return str;
-}
-
-void *
-areturn(Arena *arena, unsigned int checkpoint, const void *src, unsigned int size)
-{
-    void *dest;
-    if(arena == NULL || src == NULL) return NULL;
-    
-    dest = (void *)&arena->tape[checkpoint];
-    if (src == dest) return dest;
-
-    memmove(dest, src, size);
-    arena->count = checkpoint + size;
-    
-    return dest;
-}
-
-#define ARENA_RETURN(arena, ckpt, src_ptr, type) \
-    return (type *)areturn((arena), (ckpt), (src_ptr), sizeof(type))
-
-#define ARENA_RETURN_ARRAY(arena, ckpt, src_ptr, type, count) \
-    return (type *)areturn((arena), (ckpt), (src_ptr), sizeof(type) * (count))
+#include "undar.h"
 
 typedef struct Point Point;
 struct Point {

test/undar.h

@@ -0,0 +1,45 @@
+#ifndef UNDAR_H
+#define UNDAR_H
+
+#include <stdio.h>
+#include <string.h>
+
+typedef struct arena_s Arena;
+struct arena_s {
+	unsigned char *tape;
+	unsigned int count;
+	unsigned int capacity;
+};
+
+static void *aalloc(Arena *arena, unsigned int size){
+    unsigned int pos;
+	if(arena == NULL) return NULL;
+	if(arena->count + size > arena->capacity) return NULL;
+
+	pos = arena->count;
+	arena->count += size;
+	return (void *)&arena->tape[pos];
+}
+
+static void *
+areturn(Arena *arena, unsigned int checkpoint, const void *src, unsigned int size)
+{
+    void *dest;
+    if(arena == NULL || src == NULL) return NULL;
+    
+    dest = (void *)&arena->tape[checkpoint];
+    if (src == dest) return dest;
+
+    memmove(dest, src, size);
+    arena->count = checkpoint + size;
+    
+    return dest;
+}
+
+#define ARENA_RETURN(arena, ckpt, src_ptr, type) \
+    return (type *)areturn((arena), (ckpt), (src_ptr), sizeof(type))
+
+#define ARENA_RETURN_ARRAY(arena, ckpt, src_ptr, type, count) \
+    return (type *)areturn((arena), (ckpt), (src_ptr), sizeof(type) * (count))
+
+#endif