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#include "array.h"
#include "textcode.h"
void fmt_to_array(size_t (*func)(char*,const char*,size_t),
array* a,const char* src,size_t len) {
size_t needed=func(0,src,len);
if (array_bytes(a)+needed>=needed &&
array_allocate(a,1,array_bytes(a)+needed-1)) {
char* x=((char*)array_start(a))+array_bytes(a)-needed;
func(x,src,len);
} else
array_fail(a);
}