File: str_copy.c

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#include "str.h"

size_t str_copy(char *out,const char *in) {
  register char* s=out;
  register const char* t=in;
  for (;;) {
    if (!(*s=*t)) break; ++s; ++t;
    if (!(*s=*t)) break; ++s; ++t;
    if (!(*s=*t)) break; ++s; ++t;
    if (!(*s=*t)) break; ++s; ++t;
  }
  return s-out;
}