#include "fmt.h"
#include "textcode.h"
#include "str.h"
#include "haveinline.h"

size_t fmt_hexdump(char* dest,const char* src,size_t len) {
  register const unsigned char* s=(const unsigned char*) src;
  size_t written=0,i;
  if (!dest) return (len>((size_t)-1)/2)?(size_t)-1:len*2;
  for (i=0; i<len; ++i) {
    dest[written]=fmt_tohex(s[i]>>4);
    dest[written+1]=fmt_tohex(s[i]&15);
    written+=2;
  }
  return written;
}