#include "array.h"
#include "textcode.h"

void fmt_tofrom_array(size_t (*func)(char*,const char*,size_t),
		      array* dest,array* src) {
  size_t needed;
  char* x;
  if (array_failed(dest) || array_failed(src)) { array_fail(dest); return; }
  needed=func(0,array_start(src),array_bytes(src));
  if (array_bytes(dest)+needed>needed &&
      array_allocate(dest,1,array_bytes(dest)+needed-1)) {
    x=((char*)array_start(dest))+array_bytes(dest)-needed;
    func(x,array_start(src),array_bytes(src));
  } else
    array_fail(dest);
}