+static struct string_area *string_area_new(int size)
+{
+ struct string_area *a;
+
+ if (size <= 0) size = ARENA_SIZE;
+ a = malloc(sizeof(*a));
+ if (!a) out_of_memory("string_area_new");
+ a->current = a->base = malloc(size);
+ if (!a->current) out_of_memory("string_area_new buffer");
+ a->end = a->base + size;
+ a->next = NULL;
+
+ return a;
+}
+
+static void string_area_free(struct string_area *a)
+{
+ struct string_area *next;
+
+ for ( ; a ; a = next) {
+ next = a->next;
+ free(a->base);
+ }
+}
+
+static char *string_area_malloc(struct string_area **ap, int size)
+{
+ char *p;
+ struct string_area *a;
+
+ /* does the request fit into the current space? */
+ a = *ap;
+ if (a->current + size >= a->end) {
+ /* no; get space, move new string_area to front of the list */
+ a = string_area_new(size > ARENA_SIZE ? size : ARENA_SIZE);
+ a->next = *ap;
+ *ap = a;
+ }
+
+ /* have space; do the "allocation." */
+ p = a->current;
+ a->current += size;
+ return p;
+}
+
+static char *string_area_strdup(struct string_area **ap, const char *src)
+{
+ char* dest = string_area_malloc(ap, strlen(src) + 1);
+ return strcpy(dest, src);
+}