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#include "stralloc.h"
#include "textcode.h"
int fmt_to_sa(unsigned long (*func)(char*,const char*,unsigned long),
stralloc* sa,const char* src,unsigned long len) {
unsigned long needed=func(0,src,len);
if (!stralloc_readyplus(sa,needed)) return 0;
func(sa->s+sa->len,src,len);
sa->len+=needed;
return needed;
}